Disaster degree evaluation method

Abstract

To more accurately evaluate a damaged state of a structure.SOLUTION: There is disclosed a disaster degree evaluation method for evaluating a degree of disaster of a structure by an earthquake, which includes the steps of: obtaining the maximum response value of a site constituting the structure by a computer on the basis of output of a sensor installed in the structure; calculating an analysis disaster level of the site by the computer on the basis of the maximum response value of the site; investigating the site after occurrence of the earthquake and determining an examination disaster level of the site; and determining an integrated disaster level of the site on the basis of the analysis disaster level and the examination disaster level.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a damage assessment method. [Background technology]

[0002] For example, in Patent Document 1, a method for assessing the degree of damage to a structure caused by an earthquake involves inputting acceleration waveforms measured by sensors at the bottom of a building into a structural analysis model to perform an earthquake response analysis and calculate the response values ​​(maximum inter-story displacement, maximum acceleration) of each story of the building. Furthermore, a correction coefficient is calculated using measurements taken by sensors at the top of the building, and the response value is multiplied by the correction coefficient to calculate a corrected response value. The corrected response value is then compared with damage assessment standard data to determine the damage level of each story of the building.

[0003] In addition, for example, in Non-Patent Document 1, damage to structural components of damaged buildings after an earthquake is investigated, and the remaining seismic performance rate is calculated by multiplying the strength contribution rate of each component type (e.g., curved columns, curved beams, etc.) by the seismic performance reduction coefficient corresponding to the degree of damage, and the damage classification is determined. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-194309 A [Non-patent literature]

[0005] [Non-Patent Document 1] Earthquake Damage Classification Criteria and Restoration Technical Guidelines for Buildings, 2015 Revised Edition, 2016 (Japan Building Disaster Prevention Association) Summary of the Invention [Problem to be solved by the invention]

[0006] However, with the method of Patent Document 1, it was difficult to accurately calculate the corrected response value (especially the maximum acceleration of each story). Furthermore, it was difficult to create damage assessment standard data that accurately reflected the actual building characteristics due to the uncertainty of the strength evaluation formula, and there was a possibility that a discrepancy would occur between the damage level (disaster degree) of each story of the building after the earthquake.

[0007] In addition, in the method of Non-Patent Document 1, the range of the seismic performance reduction coefficient is set to five levels according to the degree of damage, so even if the damage level is classified as the same, there is a possibility that the damage level of components may vary. In addition, since the strength contribution rate of each component type is used, it is difficult to evaluate the seismic performance remaining rate according to the building characteristics. In addition, in the method of Non-Patent Document 1, the maximum value during the earthquake cannot be considered because the remaining value is surveyed for damaged buildings after the earthquake.

[0008] The present invention has been made in view of the above circumstances, and an object of the present invention is to enable more accurate evaluation of the damage state of actual structures. [Means for solving the problem]

[0009] In order to achieve this object, the damage assessment method of the present invention is a damage assessment method for assessing the damage level of a structure caused by an earthquake, comprising the steps of: determining a maximum response value of a portion constituting the structure based on an output of a sensor installed in the structure, by a computer; calculating an analyzed damage level of the portion based on the maximum response value of the portion; investigating the portion after the occurrence of an earthquake and determining an investigated damage level of the portion; and determining an integrated damage level of the portion based on the analyzed damage level and the investigated damage level, wherein the structure has a plurality of stories, and the sensor detects the plurality of damage levels in the structure. the maximum response value of the specified layer is determined from the maximum response value of the sensor using the first relational equation, and a maximum inter-layer displacement is set as the maximum response value of the specified layer; and the maximum inter-layer displacement of the specified layer is input into the first relational equation as the maximum inter-layer displacement of the specified layer.

[0010] According to this damage assessment method, the analytical damage degree and the survey damage degree of each part are individually assessed, so that the analytical damage degree and the survey damage degree can be mutually complemented, and therefore the damage state of the actual structure can be more accurately assessed. Furthermore, according to this damage assessment method, the damage degree (analytical damage degree) can be assessed easily and quickly. Furthermore, according to this damage assessment method, the number of sensors to be installed can be reduced.

[0011] In such a damage degree assessment method, it is preferable that the relational expression includes a second relational expression indicating the relationship between the maximum response value of the portion corresponding to the maximum response value of the layer and the analyzed damage degree.

[0012] According to this damage assessment method, the analytical damage level can be found from the maximum response value of the sensor by using the first relational expression and the second relational expression.

[0013] In such a damage assessment method, it is desirable that the sensors are installed in a certain layer and another layer spaced apart from the certain layer, and that the specified layer is located between the certain layer and the other layer.

[0014] According to such a damage assessment method, the accuracy of the analytical damage assessment can be improved.

[0015] In such a damage degree assessment method, it is desirable that the integrated damage degree of the portion is the larger of the analyzed damage degree of the portion and the investigated damage degree of the portion.

[0016] According to such a damage assessment method, the damage level (integrated damage level) of a structure can be assessed on the safer side. Effect of the Invention

[0017] According to the present invention, the damage state of an actual structure can be evaluated more accurately. [Brief description of the drawings]

[0018] [Figure 1] 1 is a schematic explanatory diagram showing the configuration of an earthquake damage assessment system. [Diagram 2] FIG. 11 is an explanatory diagram of a flow of evaluating a relational expression. [Diagram 3] FIG. 13 is an explanatory diagram of the relationship between the maximum inter-layer displacement between sensors and the maximum inter-layer displacement of a layer. [Figure 4] FIG. 13 is an explanatory diagram of the relationship between the maximum acceleration between sensors and the maximum acceleration of a layer. [Diagram 5] FIG. 11 is an explanatory diagram showing restoring force characteristics. [Figure 6] FIG. 13 is an explanatory diagram of the relationship between the maximum inter-story deformation angle of a part and the degree of damage. [Figure 7] FIG. 13 is an explanatory diagram of a damage level evaluation flow. [Figure 8] 8A and 8B are diagrams showing the relationship between crack width and seismic performance reduction coefficient. [Figure 9]FIG. 13 is a diagram showing the weight of each floor of a building in an embodiment. [Figure 10] FIG. 13 is a diagram showing the relationship between the inter-story deformation angle and the shear force. [Figure 11] FIG. 2 is a diagram showing the conditions of seismic waves used in earthquake response analysis. [Figure 12] 12A to 12C are diagrams showing the relationship between the maximum response value of the sensor and the maximum response value of a story, and Fig. 12D is a diagram showing response coefficients d1 and d2 of the maximum story displacement. [Figure 13] 13A to 13C are diagrams showing the relationship between the maximum inter-story deformation angle and the damage degree. [Figure 14] 14A to 14D are diagrams showing acceleration waveforms measured by each sensor. [Figure 15] 15A to 15C are diagrams showing interlayer displacement waveforms between sensors. [Figure 16] FIG. 13 is an explanatory diagram of the maximum inter-story displacement between sensors. [Figure 17] FIG. 13 is a diagram showing the maximum inter-story deformation angle of each story. [Figure 18] FIG. 13 is a diagram showing the analyzed damage level of each layer. [Figure 19] FIG. 13 is a diagram showing the importance coefficient of members of each layer. [Figure 20] FIG. 13 is a diagram showing the crack width of members of each layer. [Figure 21] FIG. 13 is a diagram showing the seismic performance reduction coefficient of components in each story. [Figure 22] FIG. 13 is a diagram showing the product of the seismic performance reduction coefficient and the importance coefficient of the components of each story. [Figure 23] This shows the extent of damage surveyed for each layer. [Figure 24] This shows the integrated damage level for each layer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0020] === Implementation form === <About the structure of the earthquake damage assessment system> FIG. 1 is a schematic explanatory diagram showing an example of the configuration of an earthquake damage assessment system.

[0021] The earthquake damage degree determination system shown in FIG. 1 includes a building 10 (corresponding to a structure), a sensor 20, a computer 30, and a LAN cable 40.

[0022] The building 10 is a structure to be evaluated for earthquake damage in this embodiment, and has multiple stories (layers). The building 10 in this embodiment is made of reinforced concrete (RC), but is not limited to this and may be made of, for example, reinforced steel concrete (SRC).

[0023] In this embodiment, the sensor 20 is an acceleration sensor capable of measuring an acceleration waveform. It is possible to obtain a velocity waveform or a displacement waveform from the acceleration waveform by calculation (time integration, etc.). As shown in FIG. 1, a plurality of sensors 20 (four in this example) are provided in the building 10. More specifically, the sensors 20 are provided in four non-adjacent layers (Si layer, Sj layer, etc.) among the multiple layers of the building 10. In other words, the four layers on which the sensors 20 are provided are spaced apart from each other.

[0024] The computer 30 is installed in the building 10. The computer 30 includes a memory unit that stores various data and programs, a calculation processing unit that executes programs and performs various calculations, a display unit such as a liquid crystal display, an input unit such as a keyboard and a mouse, a communication unit that communicates with the sensor 20, and the like (none of which are shown).

[0025] The LAN cable 40 connects the sensors 20 to each other and between the sensor 20 and the computer 30 so that they can communicate with each other.

[0026] With the above configuration, the acceleration waveforms measured by each sensor 20 immediately after the occurrence of an earthquake are sent to the computer 30 via the LAN cable 40. The computer 30 time-integrates the acceleration waveforms to calculate displacement waveforms, and automatically executes the evaluation flow described below to evaluate the integrated damage level of each part.

[0027] The configuration of the earthquake damage assessment system is not limited to that shown in FIG.

[0028] For example, each sensor 20 and computer 30 may be capable of communicating wirelessly.

[0029] The computer 30 may be installed outside the building 10, or may be a portable terminal (such as a tablet). Alternatively, the evaluation may be performed on a cloud (a computer connected to a network such as the Internet).

[0030] The sensors 20 may also be installed on adjacent floors of the building 10. Alternatively, the sensors 20 may be installed on only one floor of the building 10. However, if the building 10 is high-rise, the sensors 20 may be installed on multiple floors at intervals as shown in FIG. 1, thereby improving the accuracy of damage assessment with fewer sensors.

[0031] Additionally, the building 10 does not have to have multiple floors (ie, it may be a single floor).

[0032] <About earthquake damage assessment method> <Evaluation of Relational Expressions> In this embodiment, a structural analysis model of the building 10 is used to create in advance a relational expression used in the earthquake damage assessment system.

[0033] As the structural analysis model, for example, a model (so-called one-pole model) can be used in which each story (layer) of the building 10 is aggregated into one mass point to simulate the building 10 as each component. In this case, the weight of each mass point is calculated by aggregating one story centered on the floor of the building 10 into one mass point. In other words, the weight is the sum of the weight of all beams and floor slabs of that story, half the weight of the columns located above and below that story, and the floor live load.

[0034] In addition, adjacent mass points are assumed to be connected by rigidity elements (restoring force elements), damping elements that express energy absorption, etc. The values ​​of these rigidity elements and damping elements are calculated in advance, reflecting the mechanical properties of all structural members (columns and walls) that connect each floor, and are set in advance as part of the simplified model.

[0035] However, the structural analysis model is not limited to the above model, and for example, a model in which the building 10 is subdivided down to its components such as columns and beams may be used.

[0036] Fig. 2 is an explanatory diagram of the flow of evaluating the relational expressions. Note that the flow of evaluating the relational expressions shown in Fig. 2 is an evaluation performed before an earthquake occurs. In this embodiment, the evaluation of the relational expressions shown in Fig. 2 is performed by computer 30, but this is not limited to this. For example, another computer may evaluate the relational expressions (relational expressions A and B) and the results (relational expressions) may be imported into computer 30.

[0037] First, the computer 30 performs an earthquake response analysis using a structural analysis model, and obtains a relational expression A (corresponding to a first relational expression) between the maximum response value of the sensor 20 and the maximum response value of the story, as described below (S01). Next, the computer 30 sets an ultimate limit value, and then uses the structural analysis model to obtain a relational expression B (corresponding to a second relational expression) between the maximum response value of the part and the degree of damage, as described below (S02).

[0038] (Relationship between the maximum response value of the sensor and the maximum response value of the layer) Here, in order to evaluate the relational expression A between the maximum response value of the sensor 20 and the maximum response value of the layer, Weight of each layer of the 10 buildings -Relationship between story drift angle and story shear force The earthquake response analysis is performed using the above. At this time, the type and amplitude level of the earthquake wave are changed to perform earthquake response analysis for a total of M cases.

[0039] (i) Maximum story drift Fig. 3 is an explanatory diagram of the relationship between the maximum interlayer displacement between sensors and the maximum interlayer displacement of layers. In Fig. 3, the kth layer (corresponding to a predetermined layer) to which the part to be evaluated belongs is located between the Si layer and the Sj layer.

[0040] When the sensor 20 is installed on the Si and Sj layers, the maximum inter-story displacements βm,si,sj,l of the Si and Sj layers and the maximum inter-story displacement αm,k,l of the kth layer are calculated for case l by earthquake response analysis. JPEG2025074290000002.jpg28170 Here, DEsi,l(t): relative displacement waveform of the Si layer in case l DEsj,l(t): Relative displacement waveform of Sj layer in case l ΔEk,l(t): Inter-story displacement waveform of layer k in case l TE,l: seismic wave duration for case l

[0041] In this case, the relationship between the maximum inter-story displacement βm,si,sj of the Si and Sj layers and the maximum inter-story displacement αm,k of the k layer is calculated using the results of the earthquake response analysis for case M. For example, if a power formula is used as the relationship, it is evaluated as follows, but is not limited to this. JPEG2025074290000003.jpg6170Here, d1,k, d2,k: Response coefficients of maximum story drift of k-th story

[0042] The response coefficient of the maximum story drift of the kth story in equation (4) is calculated using the following equation: JPEG2025074290000004.jpg17170

[0043] Here, the coefficients in equations (5) and (6) are calculated using the following equations (7) to (10). JPEG2025074290000005.jpg39170

[0044] In this way, the relational expression A (see Figure 3) between the maximum inter-story displacement βm,si,sj between the sensors (maximum response value of the sensor) and the maximum inter-story displacement αm,k of the kth layer (maximum response value of the layer) is obtained.

[0045] (ii) Maximum acceleration FIG. 4 is a diagram illustrating the relationship between the maximum acceleration between the sensors and the maximum acceleration of the layer.

[0046] When the sensor 20 is installed on the Si and Sj layers, the maximum acceleration ζm,si,sj,l of the Si and Sj layers and the maximum acceleration λm,k,l of the k layer are calculated for case l by earthquake response analysis. JPEG2025074290000006.jpg18170Here, AEsi,l(t): Acceleration waveform of the Si layer in case l AEsj,l(t): Acceleration waveform of Sj layer in case l AEk,l(t): Acceleration waveform of layer k of case l TE,l: seismic wave duration for case l

[0047] In this case, the relationship between the maximum acceleration ζm,si,sj of the Si and Sj layers and the maximum acceleration λm,k of the k layer is calculated using the results of the earthquake response analysis for case M. For example, if a power formula is used as the relationship, it is evaluated as follows, but is not limited to this. JPEG2025074290000007.jpg6170 Here, b1,k, b2,k are the response coefficients of the maximum acceleration of the kth floor.

[0048] The response coefficient of the maximum acceleration of the kth story in equation (13) is calculated using the following equations (14) and (15). JPEG2025074290000008.jpg17170

[0049] Here, the coefficients in equations (14) and (15) are calculated as follows: JPEG2025074290000009.jpg39170

[0050] In this manner, the relational expression A' (see FIG. 4) between the maximum acceleration ζm,si,sj between the sensors (maximum response value of the sensor) and the maximum acceleration λm,k of the kth layer (maximum response value of the layer) is obtained.

[0051] (Relationship between maximum response value of part and damage level B) When the type of element is set to RC structural frame and the maximum story drift angle is set as the element's maximum response value, the relationship B between the element's maximum response value and the damage level is calculated as follows. However, the method for evaluating the relationship B is not limited to this.

[0052] First, the value of the ultimate story drift angle δu,k (ultimate limit value) of the kth story is determined. The ultimate story drift angle δu,k is the story drift angle at which the story collapses, and can be determined, for example, based on the toughness index (F value) in the "2017 Revised Edition: Seismic Diagnosis Criteria for Existing Reinforced Concrete Buildings, Commentary, July 2017" (Japan Building Disaster Prevention Association). However, the method of determining the ultimate story drift angle is not limited to this.

[0053] Next, the seismic capacity remaining rate g,k(δm,k) of the kth story is calculated based on the restoring force characteristics of the story.

[0054] FIG. 5 is an explanatory diagram showing an example of restoring force characteristics. The horizontal axis of FIG. 5 is the inter-story drift angle, and the vertical axis is the shear force. Note that the restoring force characteristics shown in FIG. 5 are the Takeda model, but are not limited to this. For example, an origin-oriented model or the like may be used.

[0055] In Fig. 5, Pd,k(δm,k) is the energy dissipation when the maximum story drift angle of the kth story is δm,k. The energy absorption amount Pu,k up to the ultimate story drift angle δu,k and the remaining energy absorption capacity Pr,k(δm,k) can be calculated based on the restoring force characteristics of the story (area in Fig. 5).

[0056] When the maximum story drift angle of the kth story is δm,k, the seismic capacity remaining rate g,k(δm,k) of the kth story is calculated from the formula (20) as the ratio of the remaining energy absorption capacity Pr,k(δm,k) to the energy absorption amount Pu,k up to the determined ultimate story drift angle δu,k, according to Non-Patent Document 1. Note that the method of calculating the seismic capacity remaining rate is not limited to this. JPEG2025074290000010.jpg8170

[0057] When the maximum inter-story drift angle of the kth story is δm,k, the damage degree E,k(δm,k) of the kth story is calculated using the following equation (21). JPEG2025074290000011.jpg5170

[0058] In this case, by changing the maximum inter-story drift angle δm,k parametrically and calculating the damage level E,k(δm,k) of the part on the kth floor, the relational expression B between the maximum inter-story drift angle δm,k (maximum response value) of the part and the damage level E,k(δm,k) of the part can be evaluated as shown in Figure 6. Figure 6 is an explanatory diagram showing an example of the relationship between the maximum inter-story drift angle of the part and the damage level.

[0059] As described above, in this embodiment, the structural analysis model of the building 10 is used to create in advance the relational expressions (relational expression A, relational expression B) for determining the damage degree (analytical damage degree) from the output of the sensor 20. The created relational expressions are stored in a storage unit or the like of the computer 30. As a result, when assessing the damage degree of the building 10 due to an earthquake, the damage degree can be assessed easily and quickly by using the predetermined relational expressions (analytical damage degree assessment described later).

[0060] <Damage assessment (after the earthquake)> 7 is an explanatory diagram of a damage assessment flow. Note that the flow shown in FIG.

[0061] (Evaluation based on earthquake damage assessment system) Immediately after an earthquake occurs, the computer 30 acquires the output of the sensor 20 (eg, an acceleration waveform) (S10), and calculates the maximum response value of the sensor from the output (S11).

[0062] For example, the displacement waveform is calculated by time-integrating the acceleration waveform measured by the sensor 20. When the sensor 20 is installed on the Si layer and the Sj layer, the maximum inter-story displacement Pm,Si,Sj between the sensors and the maximum acceleration am,Si of the sensor 20 on the si layer are calculated using the following equations (22) to (24). JPEG2025074290000012.jpg27170Here, Dsi(t): Displacement waveform of Si layer Dsj(t): Displacement waveform of Sj layer ΔDSi,Sj(t): Interlayer displacement waveform between Si layer and Sj layer Asi(t): Acceleration waveform of the Si layer T: Duration of acceleration waveform

[0063] Next, the maximum response value of the story is calculated using the relational expression A (S12). For example, when the maximum inter-story displacement is set as the maximum response value of the part, the maximum inter-story displacement Δm,k of the kth story is calculated by inputting the maximum inter-story displacement Pm,Si,Sj between the sensors into the relational expression A obtained in FIG. JPEG2025074290000013.jpg6170Here, Pm, Si, Sj: Maximum interlayer displacement between layers where the sensors are installed (between Si layer and Sj layer) d1,k, d2,k: Response coefficients of maximum story drift of k-th story

[0064] Next, the maximum response value of the part is calculated (S13). For example, the response magnification of the part is set to 1.0, and the maximum inter-story displacement of the part of the kth story is calculated by multiplying the maximum inter-story displacement of the story by the response magnification of the part. The maximum inter-story deformation angle δm,k of the part of the kth story is calculated by the following equation (26). JPEG2025074290000014.jpg8170Here, h,k: kth floor height

[0065] Next, the analytical damage degree of each part is calculated using relational expression B (S14). When the maximum inter-story drift angle of the part in the kth story is δm,k, the analytical damage degree E,k of the part in the kth story is calculated by inputting δm,k into relational expression B calculated in FIG. JPEG2025074290000015.jpg5170This allows the analysis damage level,E,k,of the part to be calculated.

[0066] (Survey evaluation) In this embodiment, the target part is surveyed after the occurrence of an earthquake, and the computer 30 calculates the seismic performance reduction using the surveyed values ​​to obtain the survey damage degree of the part (FIG. 7: S15).

[0067] For example, in the case of a reinforced concrete building 10, crack widths d,k,j, etc. are investigated for member j on the kth floor. Possible methods for this investigation include measuring the width and length of cracks with a crack scale or by image analysis. The relationship between crack widths d,k,j and seismic performance reduction coefficient η,k,j can be determined as follows based on Non-Patent Document 1, but is not limited to this:

[0068] 8A and 8B are diagrams showing an example of the relationship between crack width d, k, j and seismic performance reduction coefficient η, k, j. Note that Fig. 8A is shown in a table, and Fig. 8B is a graph of Fig. 8A.

[0069] The seismic performance remaining rate R,k of the kth floor based on the component survey is calculated by weighting and averaging the seismic performance reduction coefficient η,k,j of component j in the kth floor with the importance coefficient Er,k,j of component j in the kth floor. This makes it possible to obtain a more realistic evaluation result of the degree of damage (surveyed damage degree). The importance coefficient Er,k,j is a value (coefficient) that assigns importance to each surveyed component j (1 to nk) in the kth floor so that the sum of the importance coefficients is 1. JPEG2025074290000016.jpg7170Here, η,k,j: seismic performance reduction coefficient of member j of the kth floor Er,k,j: Importance coefficient of member j on the kth floor nk: number of surveyed members in the kth layer

[0070] The importance coefficient Er,k,j of the member j of the kth layer can be calculated, for example, from the following formula (29), but the calculation method is not limited to this. JPEG2025074290000017.jpg9170Here, Pu,k,j: Energy absorption amount up to the ultimate story drift angle δu,k,j of member j of the kth floor

[0071] In this case, the survey damage level U,k of the kth layer is calculated using the seismic capacity remaining rate R,k of the kth layer using the following equation (30). JPEG2025074290000018.jpg5170

[0072] In this embodiment, the evaluation of the survey damage level (step S15) is performed by the computer 30, but this is not limited to the above. For example, the evaluation may be performed by another computer, or may be calculated by a human (such as an investigator).

[0073] (Integrated damage assessment) Next, the computer 30 integrates the analyzed damage degree E,k and the investigated damage degree U,k of the site on the kth layer to obtain an integrated damage degree D,k (FIG. 7: S16).

[0074] The integrated damage level D,k of the part on the kth floor can be calculated by the following formula (31) by using the maximum value of the two. In this case, the damage level of the building 10 can be evaluated on the safer side. However, the method of evaluating the integrated damage level is not limited to this. For example, the average of the two may be used. JPEG2025074290000019.jpg5170

[0075] The evaluation of the integrated damage level is not limited to being performed by the computer 30, and may be performed by a human being, for example. That is, the integrated damage level D,k may be determined by determining the larger of the analyzed damage level E,k and the investigated damage level U,k of the kth layer.

[0076] As described above, in this embodiment, the analytical damage degree and the investigated damage degree of each part are evaluated separately, and it becomes possible to evaluate the integrated damage degree using both. Therefore, it becomes possible for the analytical damage degree and the investigated damage degree to complement each other. For example, if there is a discrepancy between the analytical damage degree and the investigated damage degree of each part, as described above, the damage degree of the building 10 can be evaluated on the safe side by adopting the maximum value of the two as the integrated damage degree. In this way, it is possible to evaluate the damage degree (integrated damage degree) that more accurately reflects the actual damage situation of the building 10.

[0077] Example <Structure conditions> The structure to be evaluated is a 14-story reinforced concrete building.

[0078] Figure 9 shows the weight of each story of the building in the example. Figure 10 shows the relationship between the story drift angle and the shear force. The Takeda model was set as the restoring force characteristic. The ultimate story drift angle was set to 1 / 30 for all stories.

[0079] <Sensor installation conditions> A total of four sensors were installed on layers 1, 5, 9, and 14.

[0080] <Evaluation of Relational Expressions> (Relationship between the maximum response value of the sensor and the maximum response value of the layer) A seismic response analysis was performed using a structural analysis model of the building, and the relationship between the maximum response value of the sensor and the maximum response value of the story was evaluated.

[0081] Fig. 11 is a diagram showing the conditions of the earthquake waves used in the earthquake response analysis. Here, as shown in Fig. 11, the Sendai wave and the Kobe wave were set as the earthquake waves, and the maximum acceleration of the earthquake waves was changed to cases 1 to 10 to perform earthquake response analysis for a total of 20 cases.

[0082] When the maximum inter-story displacement is set as the maximum response value of a story, the relationship (relationship A) between the maximum inter-story displacement between sensors and the maximum inter-story displacement of a story is shown in Figs. 12A to 12C. Figs. 12A to 12C are diagrams showing the relationship between the maximum response value of the sensor and the maximum response value of a story. Fig. 12A shows the relationship for the 1st to 4th floors, Fig. 12B shows the relationship for the 5th to 8th floors, and Fig. 12C shows the relationship for the 9th to 14th floors. Fig. 12D is a diagram showing the response coefficients d1 and d2 of the maximum inter-story displacement.

[0083] (Relationship between maximum response value of part and degree of damage) The maximum story drift angle was set as the maximum response value of each part, and the relationship between the maximum story drift angle of each story and the degree of damage was evaluated.

[0084] 13A to 13C are diagrams showing the relationship between the maximum inter-story deformation angle and the degree of damage, where Fig. 13A shows the relationship for the 1st to 5th floors, Fig. 13B shows the relationship for the 6th to 10th floors, and Fig. 13C shows the relationship for the 11th to 14th floors.

[0085] <Earthquake damage assessment> (Acceleration waveform, displacement waveform) Fig. 14A to Fig. 14D show the acceleration waveforms measured by the sensors immediately after the earthquake occurred. Fig. 14A to Fig. 14D show the acceleration waveforms measured by each sensor. Fig. 14A shows the output of a sensor on one layer, Fig. 14B shows the output of a sensor on five layers, Fig. 14C shows the output of a sensor on nine layers, and Fig. 14D shows the output of a sensor on fourteen layers.

[0086] These acceleration waveforms were integrated over time to calculate the displacement waveforms, and the inter-story displacement waveforms between the sensors were evaluated, as shown in Figures 15A to 15C. Figures 15A to 15C are diagrams showing the inter-story displacement waveforms between the sensors. Figure 15A shows the inter-story displacement waveforms for the 4th to 1st floors, Figure 15B shows the inter-story displacement waveforms for the 8th to 5th floors, and Figure 15C shows the inter-story displacement waveforms for the 14th to 9th floors, respectively.

[0087] The maximum inter-story displacement between the sensors at this time is shown in Fig. 16. Fig. 16 is an explanatory diagram of the maximum inter-story displacement between the sensors. Note that Fig. 16 is a diagram showing the maximum inter-story displacements of each of Figs. 15A to 15C, with the vertical axis of the diagram representing inter-story (between sensors). For example, the maximum inter-story displacement in the 4th to 1st floors is 10 cm (see Fig. 15A). Moreover, the maximum inter-story displacement in the 8th to 5th floors is 8 cm (see Fig. 15B).

[0088] (Analysis and evaluation of damage level) When the maximum inter-story displacement between the sensors was input into the relational expression A (Figs. 12A to 12C) between the maximum response value of the sensor and the maximum response value of the story, the maximum inter-story drift angle of each story was as shown in Fig. 17. Note that Fig. 17 is a diagram showing the maximum inter-story drift angle of each story.

[0089] Next, when the maximum inter-story drift angle was input into the relational expression B (FIGS. 13A to 13C) between the maximum response value of the part and the damage degree, the analytical damage degree of each story was as shown in FIG 18. Note that FIG 18 is a diagram showing the analytical damage degree of each story.

[0090] (Investigation and evaluation of damage level) The surveyed members of each floor will be pillars and beams, and the number of surveyed members will be 10. In addition, the structure (surveyed members) of each floor will be the same. Here, Importance coefficient of each layer - Crack width of each layer of material as determined by investigation were set as shown in Figures 19 and 20. Figure 19 is a diagram showing the importance coefficients of the members (surveyed members) of each story, and Figure 20 is a diagram showing the crack widths of the members (surveyed members) of each story.

[0091] At this time, - Seismic performance reduction coefficient for each floor -Product of seismic performance reduction coefficient and importance coefficient of each floor The calculation results are shown in Figures 21 and 22. Figure 21 shows the seismic performance reduction coefficients for the members of each story, and Figure 22 shows the product of the seismic performance reduction coefficients and the importance coefficients for the members of each story.

[0092] When the seismic performance remaining rate was calculated by adding up the product of the seismic performance reduction coefficient and the importance coefficient for each story, the survey damage level for each story was as shown in Figure 23. Figure 23 shows the survey damage level for each story.

[0093] In this example, the configuration of each floor (the number of surveyed components, seismic performance, and importance coefficient of each component) is the same regardless of the floor, but it may be different for each floor.

[0094] (Integrated damage assessment) When the maximum value of the analytical damage degree and the survey damage degree for each layer was calculated, the integrated damage degree for each layer was as shown in Figure 24. Figure 24 is a diagram showing the integrated damage degree for each layer. The integrated damage degree shown in Figure 24 is obtained by adopting the larger of the analytical damage degree and the survey damage degree for each layer. For example, in the 14th layer, the survey damage degree is greater than the analytical damage degree, so the survey damage degree is adopted as the integrated damage degree. Also, in the 9th layer, the analytical damage degree is greater than the survey damage degree, so the analytical damage degree is adopted as the integrated damage degree.

[0095] ===Other embodiments=== The above-mentioned embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention may be modified or improved without departing from the spirit of the present invention, and it goes without saying that the present invention includes equivalents. In particular, the following embodiments are also included in the present invention.

[0096] In the above embodiment, the building 10 is given as an example of a structure to be subjected to damage assessment, but the present invention is not limited to this. For example, the present invention may be applied to structures such as bridge piers and viaducts.

[0097] In the above embodiment, the maximum response value in relational equation A is exemplified as displacement or acceleration, but is not limited thereto. For example, velocity or energy may be used. In addition, the maximum response value of the portion in relational equation B is set to the inter-story deformation angle, but is not limited to the inter-story deformation angle and may be another response value.

[0098] In the above embodiment, the part to be evaluated is the structural frame, but it is not limited to this. For example, it may be a finish or equipment. Or it may be a layer or a member (column, beam, etc.). [Explanation of symbols]

[0099] 10 Buildings (structures) 20 Sensors 30 Computers 40 LAN cable

Claims

1. A damage assessment method for assessing the damage level of a structure caused by an earthquake, comprising: A step in which a computer determines a maximum response value of a portion constituting the structure based on an output of a sensor installed in the structure; A step of calculating an analytical damage level of the part by a computer based on a maximum response value of the part; A step of investigating the area after an earthquake occurs and determining the investigation damage level of the area; determining an integrated damage degree of the portion based on the analyzed damage degree and the investigated damage degree; having The structure has a plurality of layers; the sensors are provided only in the layers of the structure; a step of, before an earthquake occurs, a computer using a structural analysis model of the structure to create a relational expression for calculating the analytical damage level from the output of the sensor; The above relation is: a first relational expression indicating a relationship between a maximum response value of the sensor and a maximum response value of the layer; The site belongs to a predetermined layer in which the sensor is not installed, determining a maximum response value of the predetermined layer from a maximum response value of the sensor using the first relational expression; A maximum inter-story displacement is set as the maximum response value of the portion, and the maximum inter-story displacement of the predetermined layer is input into the first relational expression, the maximum inter-story displacement between the sensors. A damage assessment method comprising:

2. The damage assessment method according to claim 1, The above relation is: a second relational expression indicating a relationship between a maximum response value of the portion corresponding to the maximum response value of the layer and the analyzed damage degree; A damage assessment method comprising:

3. The damage assessment method according to claim 1, the sensor is provided on a layer and on another layer spaced apart from the layer, The predetermined layer is located between the certain layer and the other layer. A damage assessment method comprising:

4. The damage assessment method according to any one of claims 1 to 3, The integrated damage level of the part is the larger of the analysis damage level of the part and the investigation damage level of the part. A damage assessment method comprising:

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