An integrated earthquake safety assessment method for museum collections

Abstract

The present invention discloses an integrated earthquake-proof safety assessment method for museum collections, including two levels: A-level assessment and B-level assessment. A-level assessment is carried out by comprehensively considering the risks of the building, the shelf, and the cultural relics. Through the A-level assessment, A1 and A2 are obtained, wherein A1 represents safety and A2 represents risk; when the A-level assessment result is A1, the assessment is completed and an assessment report is formed, and when the A-level assessment result is A2, an empirical formula method is used to carry out a B-level assessment. In this application, a scientific, convenient and practical assessment method is provided for museum collections based on the integrated earthquake-proof design concept, which provides a basis and basis for the earthquake-proof protection of museum collections.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake protection of museum cultural relics, and in particular to an integrated earthquake safety assessment method for museum cultural relics. Background Art

[0002] my country is an ancient country with a long history and civilization. At the same time, my country is one of the countries in the world that suffers the most from earthquake disasters. Earthquakes are an important natural disaster faced by cultural relics in museums. The centralized preservation of movable cultural relics in museums is conducive to the protection, restoration and management of cultural relics, but it also increases the risk of concentrated damage under strong earthquakes, causing irreversible and significant losses to historical and cultural information. The earthquake protection of cultural relics in museums involves many fields such as natural sciences, management sciences and cultural relics protection. The earthquake risk factors of cultural relics in museums can be divided into direct risk factors and indirect risk factors. Direct risk factors refer to the earthquake risk caused by the nature of the cultural relics themselves, mainly including risks caused by materials and structures. Indirect risk factors refer to the risks caused by the external environment in which the cultural relics are located. For the earthquake risk of cultural relics in museums, the external factors are mainly the storage status of cultural relics and the external environment of cultural relics. Risk assessment of cultural relics in museums is the basis and basis for carrying out earthquake protection of cultural relics in museums. At present, there is no scientific and practical assessment method. Summary of the invention

[0003] The present application discloses an integrated earthquake-proof safety assessment method for museum collections.

[0004] This application provides the following solutions:

[0005] An integrated earthquake safety assessment method for museum collections includes two levels: A-level assessment and B-level assessment. The steps of the assessment method are as follows:

[0006] Step 1: Clarify the relevant environmental information of the museum, and divide the earthquake damage risks of the cultural relics in the collection into building risks, cabinet risks, and cultural relics risks; among them, the main body of building risks is divided into the building itself and earthquake prevention measures, the main body of cabinet risks is divided into exhibition cabinets and exhibition equipment / fittings, and the main body of cultural relics risks is divided into cultural relics, earthquake prevention devices, and basic earthquake prevention measures;

[0007] Step 2: Comprehensively consider the risks of the building, cabinets and cultural relics to carry out A-level assessment. Through the A-level assessment, A1 and A2 are obtained. Among them, A1 represents safety and A2 represents risk. When the A-level assessment result is A1, the assessment is completed and an assessment report is formed. When the A-level assessment result is A2, proceed to step 3.

[0008] Step 3: Use the empirical formula method to carry out Class B assessment. Class B assessment includes B1, B2, B3, B4 and B5 according to the corresponding risk severity from small to large. According to the earthquake fortification intensity of the area where the museum is located, it is determined whether there is a risk of collapse or partial collapse of the building. If there is a risk, it is Class B5. The assessment is completed and an assessment report is formed. Otherwise, proceed to the next step;

[0009] Step 4: Determine whether the display cabinet has the risk of shaking or overturning. If so, it is Class B4. The assessment is completed and an assessment report is formed. Otherwise, proceed to the next step.

[0010] Step 5: Analyze and calculate the earthquake risk coefficient K of floating cultural relics, where K = max{R / [R s ],R / [R r ]}, where R is the acceleration response of the place where the cultural relics are placed under a rare earthquake, [R s ] is the acceleration limit of the anti-sliding of the cultural relics in the collection, Among them, k s is the anti-sliding safety factor, k s The value is 1.2 to 1.6. When the seismic fortification level is high, the larger value is taken. When strong friction measures such as anti-skid pads are added to the bottom of floating cultural relics, the value is multiplied by 0.5 for correction. When measures such as fastening fixtures are used for floating cultural relics, the value is multiplied by 0.2 for correction. μ 0 is the static friction coefficient between the display cabinet and the supporting surface; [R r ] is the acceleration limit of the anti-shake of the cultural relics in the collection, h c / b c is the aspect ratio of the cultural relic, k r is the anti-shake safety factor, with a value of 1.1 to 1.3;

[0011] Step 6: According to the floating cultural relics earthquake hazard coefficient K, the B1, B2 and B3 levels of earthquake damage to the collection of cultural relics are evaluated: when the floating cultural relics earthquake hazard coefficient K≤1, the cultural relics risk level is B1; when the floating cultural relics earthquake hazard coefficient 1<K≤1.5, the cultural relics risk level is B2; when the floating cultural relics earthquake hazard coefficient K>1.5, the cultural relics risk level is B3, and the collection of cultural relics earthquake vulnerability assessment method is used for review, and the assessment is completed and an assessment report is formed. Optionally, in the process of carrying out the A-level assessment, the analysis of the risks of the building, the shelf and the cultural relics is included;

[0012] In the process of analyzing the risks of the museum building, determine whether the museum building meets the actual situation of relevant seismic design and construction specifications or reinforcement and renovation, and whether seismic isolation floors are installed;

[0013] In the process of analyzing the risks of the cabinets, comprehensively judge whether there is a risk of earthquake damage to the exhibition cabinets and the exhibits / equipment contained in the space inside the cabinets;

[0014] In the process of analyzing the risks of cultural relics, the earthquake vulnerability of the cultural relics themselves, the stability of the cultural relics' morphology, and the current status of basic earthquake prevention measures or seismic isolation measures are analyzed.

[0015] Among them, if any of the risk assessments for building risk, cabinet risk, and cultural relic risk is A2, the comprehensive conclusion of the A-level earthquake resistance assessment should be A2.

[0016] Optionally, during the A-level assessment, the building risk is considered from the perspective of seismic design. When the building is designed and constructed in accordance with the "Building Seismic Design Code" after 2008, it is deemed safe, otherwise it is deemed to be risky. During the analysis of seismic measures in the building risk, the seismic isolation floor level is considered. When the cultural relics preservation area adopts effective seismic isolation floors, it is deemed to be safe, otherwise it is deemed to be risky.

[0017] Optionally, the analysis of cabinet risks in Class A assessment includes the analysis of display and storage cabinets. During the analysis of display and storage cabinets, the display and storage cabinets are deemed safe if they have effective seismic isolation or strong fixing measures, or anti-overturning measures. Otherwise, they are deemed to be risky.

[0018] Optionally, the A-level assessment of shelf risk includes analysis of displays / fittings;

[0019] During the analysis of exhibits / installations, when the exhibits / installations are display exhibits, they are deemed safe when they have fixing measures, otherwise they are deemed to be risky; when the exhibits / installations are collection exhibits, they are deemed safe when the cultural relics are stored in bags or boxes or there are preventive measures to prevent the cultural relics from colliding, falling, opening of cabinet doors and slipping of drawers, otherwise they are deemed to be risky.

[0020] Optionally, the analysis of cultural relic risks in the A-level assessment includes the analysis of the cultural relic itself;

[0021] During the analysis of the cultural relics themselves, an assessment is made from the perspective of their status. If the cultural relics are made of materials that are not easily damaged by earthquakes, their shapes are stable, and they are fixed to the exhibition stands or to the exhibition equipment, they are considered safe; otherwise, they are considered risky.

[0022] Optionally, the analysis of cultural relics risk in the A-level assessment includes analysis of earthquake-proof devices;

[0023] During the analysis of the anti-vibration device, an assessment is made from the perspective of seismic reduction and isolation measures. When the cabinet frame is fixed and there is seismic isolation at the bottom of the cultural relics, it is considered safe, otherwise it is considered to be risky.

[0024] Optional: Analysis of risks to cultural relics in Class A assessment Analysis of basic earthquake prevention measures;

[0025] In the analysis of basic anti-seismic measures, when the basic anti-seismic measure is the clamping method, when the height of the clamping fixture H ≥ 1.2H min When the pretension force T∈[40,80]*D min 2 And D ≥ 1.2D min When it is detected, it is considered safe, otherwise it is considered risky;

[0026] Among them, H min The minimum height of the fixing piece required to fix the cultural relic by the fixing method, D min It is the minimum cross-sectional diameter of the silk thread required to fix cultural relics by tying method, and D is the diameter of the silk thread for tying method.

[0027] Optionally, during the B4 assessment, in the process of determining whether the display cabinet has a risk of shaking or overturning, when the display cabinet is in a floating state, the discriminant formula for whether the display cabinet does not shake is: And μ 0 >b c / h c ;

[0028] Among them, h c / b c is the aspect ratio of the cultural relic, k r is the anti-shake safety factor, ranging from 1.1 to 1.3, a h0 is the maximum horizontal earthquake acceleration of the display cabinet, μ 0 is the static friction coefficient between the display cabinet and the supporting surface, and g is the acceleration due to gravity.

[0029] Optionally, after the B-level assessment is completed, a review step using the earthquake vulnerability assessment method for the collection of cultural relics is also included;

[0030] Step S1: Select reasonable seismic waves according to the seismic design code for buildings to carry out seismic vulnerability analysis, and obtain the failure probability of the cultural relics in the collection under earthquakes of different intensities. The number of seismic waves is not less than 20;

[0031] Step S2: The acceleration limit of each seismic wave is modulated in the range of 0 to 1 g at an interval of 0.05 g, and the dynamic response analysis of the museum building is carried out to obtain the floor response wave;

[0032] Step S3: input the above-obtained floor response waves to the display cabinet to obtain the tabletop response waves; input the above-obtained tabletop response waves to the cultural relic to obtain the sliding and shaking responses of the cultural relic;

[0033] Step S4: 70% of the limit sliding amount S and 50% of the overturning critical shaking angle α are used as performance indicators of the sliding and overturning risks of the cultural relics;

[0034] The limit sliding distance S of the cultural relic is the allowable distance for the cultural relic to slide rigidly. 1 , S 2 and S 3 The minimum value of the three; S 1 S is the minimum horizontal distance from the outer surface of the cultural relic to the display case glass. 2 S is the minimum horizontal distance from the outer edge of the bottom surface of the cultural relic to the edge of the pedestal. 3 is the minimum horizontal distance between the outer surfaces of each cultural relic;

[0035] The shaking angle α of the cultural relic is the angle at which the cultural relic shakes rigidly. The critical shaking angle α of the cultural relic can be calculated according to the formula α=arctan(b c / h c ) is calculated, where h c / b c is the height-to-width ratio of the cultural relic;

[0036] Step S5: Regression analysis is performed on the sliding and shaking response data of the cultural relics, and statistical analysis is performed on the mutual dependence between the acceleration amplitude and the cultural relic limit sliding amount S or the cultural relic shaking angle α. The sliding and shaking vulnerability curves of the cultural relics are established in combination with the performance target to obtain the sliding and overturning failure probabilities of the cultural relics under earthquakes of different intensities;

[0037] Step S6: Based on the annual probability of earthquakes of different intensities occurring at the museum site, i.e., the earthquake hazard curve, the earthquake sliding and overturning risk probability of the cultural relics within the design service life of the museum is obtained.

[0038] By adopting the above technical solution, the present invention has the following beneficial effects:

[0039] The integrated earthquake-proof safety assessment method for museum collections in this application provides a scientific, convenient and practical assessment method for museum collections based on the integrated earthquake-proof design concept, provides a foundation and basis for earthquake-proof protection of museum collections, and is conducive to improving the earthquake-proof safety level of museum collections.

[0040] The specific implementation modes of the present invention are further described in detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are part of this application and are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0042] Figure 1 A logic diagram of the integrated earthquake safety assessment method for museum cultural relics provided in the embodiment of the present application.

[0043] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0044] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0046] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0047] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0048] The present application embodiment provides an integrated earthquake safety assessment method for museum collections, which is based on domestic museums to carry out an integrated earthquake safety assessment of museum collections. The assessment method includes the following steps:

[0049] Step 1: Clarify the museum's relevant environmental information and divide the earthquake damage risk of the cultural relics in the collection into multiple risk items, each of which includes building risk, cabinet risk and cultural relic risk. Among them, the main body of the building risk includes the building itself and earthquake prevention measures, the main body of the cabinet risk includes exhibition cabinets and exhibition equipment / fittings, and the main body of the cultural relic risk includes the cultural relic itself, earthquake prevention devices and basic earthquake prevention measures.

[0050] Step 2: First, conduct a Class A assessment by comprehensively considering the risks of the building, cabinets and cultural relics, and then conduct a Class B assessment or end the assessment based on the results of the Class A assessment;

[0051] Among them, the results of the A-level assessment include A1 (safe) and A2 (risky). If the risks of the building, shelf and cultural relics of the collection are all safe, the earthquake resistance level of the collection is assessed to be A1, the assessment is completed, and an assessment report is formed. Otherwise, the earthquake resistance level of the collection is assessed to be A2, and a B-level assessment is carried out. In the B-level assessment, the corresponding B-level earthquake resistance level is assessed according to the severity of the risk of the collection.

[0052] Among them, the process of carrying out the A-level assessment includes the analysis of the risks of the building, the risks of the cabinets and the risks of the cultural relics;

[0053] In the process of analyzing the risks of the museum building, determine whether the museum building meets the actual situation of relevant seismic design and construction specifications or reinforcement and renovation, and whether seismic isolation floors are installed;

[0054] In the process of analyzing the risks of the cabinets, comprehensively judge whether there is a risk of earthquake damage to the exhibition cabinets and the exhibits / equipment contained in the space inside the cabinets;

[0055] In the process of analyzing cultural relics risks, the earthquake vulnerability of the cultural relics themselves, the stability of the cultural relics' morphology, and the current status of basic earthquake prevention measures or seismic isolation measures are analyzed.

[0056] Optionally, the risk analysis of the library building in the A-level assessment includes the analysis of the building itself and the analysis of earthquake-proof measures;

[0057] Among them, in the analysis process of the building itself, from the perspective of seismic design, when the building is designed and built according to the "Building Seismic Design Code" after 2008, it is considered safe, otherwise it is considered to be risky; in the analysis process of seismic measures, from the perspective of seismic isolation floors, when effective seismic isolation floors are adopted in the cultural relics preservation area, it is considered safe, otherwise it is considered to be risky.

[0058] The analysis of shelf risk in the A-level assessment includes the analysis of display shelves and the analysis of display equipment / fittings;

[0059] Among them, in the analysis process of exhibition cabinets, if the exhibition cabinets have effective seismic isolation or strong fixing measures, or anti-overturning measures, they are considered safe, otherwise they are considered risky;

[0060] During the analysis of exhibits / installations, when the exhibits / installations are display exhibits, they are deemed safe when they have fixing measures, otherwise they are deemed to be risky; when the exhibits / installations are collection exhibits, they are deemed safe when the cultural relics are stored in bags or boxes or there are preventive measures to prevent the cultural relics from colliding, falling, opening of cabinet doors and slipping of drawers, otherwise they are deemed to be risky.

[0061] Optionally, the analysis of cultural relic risks in the A-level assessment includes: analysis of the cultural relic itself, analysis of earthquake-proof devices, and analysis of basic earthquake-proof measures;

[0062] During the analysis of the cultural relics themselves, the status of the cultural relics is evaluated. If the cultural relics are made of materials that are not easily damaged by earthquakes, the shape of the cultural relics is stable, and the cultural relics are fixed to the exhibition stand or the cultural relics are fixed to the exhibition equipment, they are considered safe. Otherwise, they are considered to be at risk.

[0063] In the analysis of the anti-vibration device, the seismic isolation measures are evaluated. When the cabinet frame is fixed and the bottom of the cultural relic is isolated, it is considered safe, otherwise it is considered risky.

[0064] In the analysis of basic anti-seismic measures, when the basic anti-seismic measure is the clamping method, when the height of the clamping fixture H ≥ 1.2H min When the pretension force T∈[40,80]*D min 2 And D ≥ 1.2D min When it is, it is considered safe, otherwise it is considered risky. min The minimum height of the fixing piece required to fix the cultural relic by the fixing method, D min It is the minimum cross-sectional diameter of the silk thread required to fix cultural relics by tying method, and D is the diameter of the silk thread for tying method.

[0065] For example, the structure system of the museum to be evaluated for earthquake resistance is a reinforced concrete frame structure, built in 2010, with a total of 5 floors above ground. The earthquake fortification intensity in the area where the museum is located is 7 degrees (0.1g), and the acceleration amplitude of rare earthquakes is 220gal. The size of the display cabinet in the museum is 800mm*800mm*2300mm (height), the height-to-width ratio of the display cabinet is hc / bc=2.875, the display cabinet is floating on the fourth floor, and the friction coefficient between the display cabinet and the floor is 0.3. The height-to-width ratio of the cultural relics to be evaluated is 1, and the cultural relics are directly floated on the display cabinet surface, and the friction coefficient between the cultural relics and the display stand is 0.3.

[0066] The museum building was built in 2010 and was designed and constructed in accordance with the "Building Seismic Design Code" after 2008. The building itself is considered safe. Regarding cabinet and shelf risks: the display cabinets are directly floating on the floor, and no effective seismic isolation or strong fixing measures have been taken. There are no anti-overturning measures, so it is considered to be risky. Cultural relic risk: the cultural relics to be evaluated are directly floating on the display cabinet surface, and are not fixed to the display cabinets and stands, so they are considered to be risky. In summary, if any of the risks among the building risk, cabinet risk, and cultural relic risk are assessed as risky, the comprehensive conclusion of the A-level seismic assessment should be A2 (risky), and it is necessary to continue the B-level assessment.

[0067] Step 3: Carry out Class B assessment using earthquake vulnerability assessment method. Class B assessment is divided into 5 levels: B1 (safe or mild risk), B2 (moderate risk), B3 (severe risk), B4 (serious risk), and B5 (major risk). In the Class B assessment, the risk items are analyzed in order of severity. If the risk of the building is judged to have the risk of collapse, it is directly judged as Class B5, the assessment is completed and an assessment report is formed, otherwise it goes to step 4.

[0068] Step 4: When the building risk is safe and the cabinets have the risk of shaking or overturning, it is directly judged as B4. When both the building risk and the cabinet risk are safe, the corresponding earthquake resistance level is calculated according to the formula method. The earthquake resistance levels calculated by the formula method include B3, B2 and B1.

[0069] Among them, the results of the B-level assessment include, in order from small to large, the corresponding risk severity: B1, B2, B3, B4 and B5.

[0070] For example: The structural system of the museum building is a reinforced concrete frame structure. It was built in 2010, which is after 2008. It was designed and built in accordance with the "Code for Seismic Design of Buildings" and meets the seismic fortification requirements of not collapsing in a major earthquake. Therefore, there is no risk of collapse or partial collapse of the building structure, so the B4 level assessment will continue to be carried out.

[0071] In the process of judging whether the display cabinet has the risk of shaking or overturning, when the display cabinet is in a floating state, the judging formula for whether the display cabinet does not shake is: And μ 0 >b c / h c ;

[0072] Among them, h c / b c is the aspect ratio of the cultural relic, k r is the anti-shake safety factor, ranging from 1.1 to 1.3, a h0 is the maximum horizontal earthquake acceleration of the display cabinet, μ 0 is the static friction coefficient between the display cabinet and the supporting surface.

[0073] For example, the museum building structure system is based on the WW / T0069-2015 earthquake-proof code for cultural relics in collections. According to the structure type of the museum, the horizontal dynamic amplification coefficient D of the fourth floor of the structure is obtained. 1 =2.50, the maximum horizontal earthquake acceleration of the display cabinet a h0 =5.5m / s 2 , the anti-shake safety factor is taken as k r =1.2, then And μ 0 =0.3<bc / h c =0.35, so the showcase does not meet the requirement of no risk of shaking or collapse, and the process goes to step 5 to carry out B1, B2 and B3 assessments.

[0074] Step 5: Analyze and calculate the earthquake risk coefficient K of floating cultural relics;

[0075] Among them, the earthquake hazard coefficient K of floating cultural relics is calculated using the following calculation method:

[0076] K=max{R / [R s ],R / [R r ]};

[0077] Where R is the acceleration response of the place where the cultural relics are placed under a rare earthquake, [R s ] is the acceleration limit of the anti-sliding of the cultural relics in the collection, k s is the anti-sliding safety factor, k s The value is 1.2 to 1.6. When the seismic fortification level is high, the larger value is taken. When strong friction measures such as anti-skid pads are added to the bottom of floating cultural relics, the value is multiplied by 0.5 for correction. When measures such as fastening fixtures are used for floating cultural relics, the value is multiplied by 0.2 for correction. μ 0 is the static friction coefficient between the display cabinet and the supporting surface; [R r ] is the acceleration limit of the anti-shake of the cultural relics in the collection, h c / b c is the aspect ratio of the cultural relic, k r is the anti-shake safety factor, with a value of 1.1 to 1.3;

[0078] The height-to-width ratio of the cultural relic to be assessed is 1, the friction coefficient of the cultural relic is 0.3, and according to the WW / T0069-2015 earthquake-proof standard for cultural relics in museums, the horizontal dynamic amplification coefficient of the display cabinet is D 2 =1.15, the acceleration response of the place where the cultural relics are placed under rare earthquakes is R = 6.33m / s 2 .

[0079] [R S ]=μ 0 g / k s =0.3*10 / 1.4=2.14m / s 2

[0080] [R r ]=g / k r / (h c / b c )=10 / 1.2 / 1=8.33m / s 2

[0081] R / Rs =6.33 / 2.14=2.96

[0082] R / R r =6.33 / 8.33=0.76

[0083] K=max{R / [R S ],R / [R r ]}=max{2.96,0.76}=2.96

[0084] Step 6: Determine the B1, B2 and B3 levels of earthquake damage to the cultural relics in the collection according to the earthquake risk coefficient K of the floating cultural relics;

[0085] According to the earthquake risk coefficient K of floating cultural relics, the B1, B2 and B3 levels of earthquake damage to cultural relics in museums include:

[0086] When the earthquake hazard coefficient of floating cultural relics K≤1, the risk level of cultural relics is B1; when the earthquake hazard coefficient of floating cultural relics 1<K≤1.5, the risk level of cultural relics is B2; when the earthquake hazard coefficient of floating cultural relics K>1.5, the risk level of cultural relics is B3.

[0087] For example, the earthquake hazard coefficient of the cultural relics to be assessed is K=2.96>1.5, the risk level of the cultural relics is B3, and the assessment is completed.

[0088] Optionally, after the B-level assessment is completed, a review step using the earthquake vulnerability assessment method for the collection of cultural relics is also included;

[0089] Step S1: Select reasonable seismic waves according to the seismic design code for buildings to carry out seismic vulnerability analysis, and obtain the failure probability of the cultural relics in the collection under earthquakes of different intensities. The number of seismic waves is not less than 20;

[0090] Step S2: The acceleration limit of each seismic wave is modulated in the range of 0 to 1 g at an interval of 0.05 g, and the dynamic response analysis of the museum building is carried out to obtain the floor response wave;

[0091] Step S3: input the above-obtained floor response waves to the display cabinet to obtain the tabletop response waves; input the above-obtained tabletop response waves to the cultural relic to obtain the sliding and shaking responses of the cultural relic;

[0092] Step S4: 70% of the limit sliding amount S and 50% of the overturning critical shaking angle α are used as performance indicators of the sliding and overturning risks of the cultural relics;

[0093] The limit sliding distance S of the cultural relic is the allowable distance for the cultural relic to slide rigidly. 1 , S 2 and S 3 The minimum value of the three; S1 S is the minimum horizontal distance from the outer surface of the cultural relic to the display case glass. 2 S is the minimum horizontal distance from the outer edge of the bottom surface of the cultural relic to the edge of the pedestal, 3 is the minimum horizontal distance between the outer surfaces of each cultural relic;

[0094] The shaking angle α of the cultural relic is the angle at which the cultural relic shakes rigidly. The critical shaking angle α of the cultural relic can be calculated according to the formula α=arctan(b c / h c ) is calculated, where h c / b c is the height-to-width ratio of the cultural relic;

[0095] Step S5: Regression analysis is performed on the sliding and shaking response data of the cultural relics, and statistical analysis is performed on the mutual dependence between the acceleration amplitude and the cultural relic limit sliding amount S or the cultural relic shaking angle α. The sliding and shaking vulnerability curves of the cultural relics are established in combination with the performance target to obtain the sliding and overturning failure probabilities of the cultural relics under earthquakes of different intensities;

[0096] Step S6: Based on the annual probability of earthquakes of different intensities occurring at the museum site, i.e., the earthquake hazard curve, the earthquake sliding and overturning risk probability of the cultural relics within the design service life of the museum is obtained.

[0097] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modify the technical contents suggested above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the solution of the present invention.

Claims

1. An integrated earthquake safety assessment method for museum collections. It is characterized in that It includes two levels: A-level assessment and B-level assessment. The assessment method steps are as follows: Step 1: Clarify the relevant environmental information of the museum, and divide the earthquake damage risks of the cultural relics in the collection into building risks, cabinet risks, and cultural relics risks; among them, the main body of building risks is divided into the building itself and earthquake prevention measures, the main body of cabinet risks is divided into exhibition cabinets and exhibition equipment / fittings, and the main body of cultural relics risks is divided into cultural relics, earthquake prevention devices, and basic earthquake prevention measures; Step 2: Comprehensively consider the risks of the building, cabinets and cultural relics to carry out A-level assessment. Through the A-level assessment, A1 and A2 are obtained. Among them, A1 represents safety and A2 represents risk. When the A-level assessment result is A1, the assessment is completed and an assessment report is formed. When the A-level assessment result is A2, proceed to step 3. Step 3: Use the empirical formula method to carry out B-level assessment. B-level assessment includes B1, B2, B3, B4 and B5 in order from small to large according to the corresponding risk severity. According to the earthquake fortification intensity of the area where the museum is located, determine whether there is a risk of collapse or partial collapse of the building. If there is a risk, it is B5. The assessment is completed and an assessment report is formed. Otherwise, proceed to the next step; Step 4: Determine whether the display cabinet has the risk of shaking or overturning. If so, it is Class B4. The assessment is completed and an assessment report is formed. Otherwise, proceed to the next step. Step 5: Analyze and calculate the earthquake risk coefficient K of floating cultural relics, where K = max{R / [R s ],R / [R r ]}, R is the acceleration response of the place where the cultural relics are placed under rare earthquakes, [R s ] is the acceleration limit of the anti-sliding of the cultural relics in the collection, Among them, k s is the anti-sliding safety factor, k s The value is 1.2 to 1.

6. When the seismic fortification level is high, the larger value is taken. When strong friction measures such as anti-skid pads are added to the bottom of floating cultural relics, the value is multiplied by 0.5 for correction. When measures such as fastening fixtures are used for floating cultural relics, the value is multiplied by 0.2 for correction. μ 0 is the static friction coefficient between the display cabinet and the supporting surface; [R r ] is the acceleration limit of the anti-shake of the cultural relics in the collection, h c / b c k is the aspect ratio of the cultural relic; r is the anti-shake safety factor, with a value of 1.1 to 1.3; Step 6: According to the floating cultural relics earthquake risk coefficient K, the B1, B2 and B3 levels of earthquake damage to the collection of cultural relics are evaluated: when the floating cultural relics earthquake risk coefficient K≤1, the cultural relics risk level is B1; when the floating cultural relics earthquake risk coefficient 1<K≤1.5, the cultural relics risk level is B2; when the floating cultural relics earthquake risk coefficient K>1.5, the cultural relics risk level is B3, and the collection of cultural relics earthquake vulnerability assessment method is used for review, and the assessment is completed and an assessment report is formed; After the B-level assessment is completed, the earthquake vulnerability assessment method for the collection of cultural relics is used for review, and the steps are as follows: S1. Conduct earthquake vulnerability analysis and dynamic response analysis of museum buildings to obtain floor response waves, and then obtain the sliding and shaking responses of cultural relics. Use 70% of the limit sliding amount S and 50% of the overturning critical shaking angle α as performance indicators of cultural relics sliding and overturning risks; The limit sliding distance S of the cultural relic is the allowable distance for the cultural relic to slide rigidly. 1 , S 2 and S 3 The minimum value of the three; S 1 S is the minimum horizontal distance from the outer surface of the cultural relic to the display case glass. 2 S is the minimum horizontal distance from the outer edge of the bottom surface of the cultural relic to the edge of the pedestal. 3 is the minimum horizontal distance between the outer surfaces of each cultural relic; The critical shaking angle α of the overturning of the cultural relic is the angle at which the cultural relic undergoes rigid body shaking motion. The critical shaking angle α of the overturning of the cultural relic can be calculated according to the formula α=arctan(b c / h c ) is calculated, h c / b c is the height-to-width ratio of the cultural relic; S2. Perform regression analysis on the sliding and shaking response data of cultural relics, conduct statistical analysis on the interdependence between the acceleration amplitude and the cultural relics' limit sliding amount S or overturning critical shaking angle α, establish sliding and shaking vulnerability curves of cultural relics in combination with performance targets, and obtain the sliding and overturning failure probabilities of cultural relics under earthquakes of different intensities; S3. Combined with the annual probability of earthquakes of different intensities occurring at the museum's site, that is, the earthquake hazard curve, the probability of earthquake sliding and overturning risks of cultural relics within the museum's design service life is obtained.

2. According to the integrated earthquake safety assessment method for museum collections of cultural relics as described in claim 1, It is characterized in that In the process of carrying out the A-level assessment, the risks of the building, the risks of the cabinets and the risks of the cultural relics are analyzed separately; In the process of analyzing the risks of the museum building, determine whether the museum building meets the actual situation of relevant seismic design and construction specifications or reinforcement and renovation, and whether seismic isolation floors are installed; In the process of analyzing the risks of the cabinets, comprehensively judge whether there is a risk of earthquake damage to the exhibition cabinets and the exhibits / equipment contained in the space inside the cabinets; In the process of analyzing the risks of cultural relics, the earthquake vulnerability of the cultural relics themselves and the stability of the cultural relics, as well as the current status of basic earthquake prevention measures or seismic isolation measures are analyzed; Among them, if any of the risk assessments for building risk, cabinet risk, and cultural relic risk is A2, the comprehensive conclusion of the A-level earthquake resistance assessment should be A2.

3. The integrated earthquake safety assessment method for museum collections according to claim 2, It is characterized in that During the A-level assessment, the building risk is considered from the perspective of seismic design. When the building is designed and constructed in accordance with the "Building Seismic Design Code" after 2008, it is deemed safe; otherwise, it is deemed to be risky. During the analysis of seismic measures in the building risk, the seismic isolation floor level is considered. When the cultural relics preservation area adopts effective seismic isolation floors, it is deemed to be safe; otherwise, it is deemed to be risky.

4. The integrated earthquake safety assessment method for museum collections according to claim 3, It is characterized in that The analysis of cabinet risks in the A-level assessment includes the analysis of display and storage cabinets. During the analysis of display and storage cabinets, if the display and storage cabinets adopt effective seismic isolation or have strong fixing measures, or have anti-overturning measures, they are considered safe, otherwise they are considered risky.

5. The integrated earthquake safety assessment method for museum collections according to claim 4, It is characterized in that The shelf risk in the A-level assessment includes the analysis of the display fixtures / installations; During the analysis of exhibits / installations, when the exhibits / installations are display exhibits, they are deemed safe when they have fixing measures, otherwise they are deemed to be risky; when the exhibits / installations are collection exhibits, they are deemed safe when the cultural relics are stored in bags or boxes or there are preventive measures to prevent the cultural relics from colliding, falling, opening of cabinet doors and slipping of drawers, otherwise they are deemed to be risky.

6. The integrated earthquake safety assessment method for museum collections according to claim 5, It is characterized in that The analysis of cultural relic risks in the A-level assessment includes the analysis of the cultural relic itself; During the analysis of the cultural relics themselves, an assessment is made from the perspective of their status. If the cultural relics are made of materials that are not easily damaged by earthquakes, their shapes are stable, and they are fixed to the exhibition stands or to the exhibition equipment, they are considered safe; otherwise, they are considered risky.

7. The integrated earthquake safety assessment method for museum collections according to claim 6, It is characterized in that The analysis of cultural relics risk in the A-level assessment includes analysis of earthquake-proof devices; During the analysis of the anti-vibration device, an assessment is made from the perspective of seismic reduction and isolation measures. When the cabinet frame is fixed and there is seismic isolation at the bottom of the cultural relics, it is considered safe, otherwise it is considered to be risky.

8. The integrated earthquake safety assessment method for museum collections according to claim 7, It is characterized in that Analysis of cultural relics risks in Class A assessment Analysis of basic earthquake prevention measures; In the analysis of basic anti-seismic measures, when the basic anti-seismic measure is the clamping method, when the height of the clamping fixture H ≥ 1.2H min When the pretension force T∈[40,80]*D min 2 And D ≥ 1.2D min When it is detected, it is considered safe, otherwise it is considered risky; Among them, H min The minimum height of the fixing piece required to fix the cultural relic by the fixing method, D min It is the minimum cross-sectional diameter of the silk thread required to fix cultural relics by tying method, and D is the diameter of the silk thread for tying method.

9. The integrated earthquake safety assessment method for museum collections according to claim 8, It is characterized in that During the B4 assessment, when judging whether the display cabinet has the risk of shaking or overturning, when the display cabinet is in a floating state, the discriminant formula for the display cabinet not shaking is: And μ 0 >b c / h c ; Among them, h c / b c is the aspect ratio of the cultural relic, k r is the anti-shaking safety factor, with a value of 1.1 to 1.3, a h0 is the maximum horizontal seismic acceleration of the display and storage cabinet, μ 0 is the static friction coefficient between the display and storage cabinet and the support surface, and g is the acceleration due to gravity.

10. The integrated earthquake safety assessment method for museum collections according to claim 1, It is characterized in that The specific steps of reviewing the earthquake vulnerability assessment method for cultural relics in museums include: Step S1: Select reasonable seismic waves according to the seismic design code for buildings to carry out seismic vulnerability analysis, and obtain the failure probability of the cultural relics in the collection under earthquakes of different intensities. The number of seismic waves is not less than 20; Step S2: The acceleration limit of each seismic wave is modulated in the range of 0 to 1 g at an interval of 0.05 g, and the dynamic response analysis of the museum building is carried out to obtain the floor response wave; Step S3: input the above-obtained floor response waves to the display cabinet to obtain the tabletop response waves; input the above-obtained tabletop response waves to the cultural relic to obtain the sliding and shaking responses of the cultural relic.

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