Method for keeping structural performance of concrete T-beam after impact
By conducting structural status evaluation and scientific determination of reinforcement schemes for concrete T beams, the lack of damage detection and comprehensive evaluation in the existing technology has been solved, and the safety and operationality of the structure has been improved.
Patent Information
- Application Number
- CN202411863822.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-03-11
AI Technical Summary
The lack of damage status detection and comprehensive evaluation methods for concrete T-beam structures in the prior art, resulting in a lack of scientific basis for post-impact reinforcement work, which affects the safety and operation of the structure.
By evaluating the structural status of the concrete T beam after being hit, including the evaluation of appearance damage, cracks, concrete strength and steel bar protective layer thickness, the damage coefficient of each subunit is calculated and dynamic weighted calculation is performed, the reinforcement area and method are determined, and the bearing capacity is checked after reinforcement.
Accurate damage assessment of concrete T-beam structure is achieved, scientific basis for the reinforcement plan, improved the reinforcement efficiency and effect, and ensured the safety and load-bearing capacity of the structure.
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Abstract
Description
Technical Field
[0001] The present application relates to the technical field of road and bridge detection, and in particular to a method for maintaining the structural performance of a concrete T-beam after impact. Background Art
[0002] Concrete T-beam structure is a structural form widely used in heavy-load railways, highways, and municipal roads. This structural form can give full play to the good material properties of concrete and the stress-bearing properties of the beam structure, so that the beam structure can maintain long-term durability and good load-bearing effect.
[0003] As the application scope of railway concrete T-beam structures becomes more and more extensive, the impact risk they face is becoming more and more significant. After the concrete T-beam encounters an impact, the structure needs to be inspected, evaluated, reinforced and repaired in time to reduce the impact of line interruption on the railway line.
[0004] However, the relevant technology does not yet have a method for detecting and comprehensively evaluating the damage status of concrete T-beam structures. Generally, the impacted parts are directly reinforced through visual inspection, resulting in a lack of systematic inspection of the concrete T-beam structure, affecting its subsequent safety and operability. Summary of the invention
[0005] The present application provides a method for maintaining the structural performance of a concrete T-beam after impact, so as to solve the technical problem of lack of damage status detection and comprehensive evaluation for concrete T-beam structures in the related art.
[0006] The present application provides a method for maintaining structural performance of a concrete T-beam after impact, comprising:
[0007] Performing a structural state assessment step on the impacted concrete T-beam to obtain a structural state assessment result;
[0008] Determining the reinforcement area and reinforcement method of the concrete T-beam according to the structural state assessment result;
[0009] Reinforcing the concrete T-beam according to the selected reinforcement method;
[0010] The bearing capacity of the load-bearing section of the reinforced concrete T-beam is checked.
[0011] In some possible implementations, the structural state assessment calculation includes an appearance damage state assessment subunit, a crack state assessment subunit, a concrete strength state assessment subunit, and a steel bar cover thickness state assessment subunit; each subunit corresponds to a structural state damage coefficient;
[0012] The performing of structural status evaluation calculation on the impacted concrete T-beam to obtain a structural status evaluation result also includes:
[0013] Determine a dynamic weighting coefficient, and perform dynamic weighted calculations in sequence according to the dynamic weighting coefficient and the structural state damage coefficient to obtain a plurality of structural state assessment results; wherein the dynamic weighting coefficients corresponding to different subunits have different proportions.
[0014] In some possible implementations, the appearance damage coefficient corresponding to the appearance damage status assessment subunit is calculated by the following formula:
[0015]
[0016] Among them, R1 is the appearance damage coefficient corresponding to the appearance damage status assessment subunit, T1 is the area of the severely damaged area of the T-beam after the impact, T2 is the total damaged area of the T-beam after the impact, M1 is the area limit value of the severely damaged area of the T-beam, and M2 is the total inspection area of the T-beam after the impact.
[0017] In some possible implementations, the crack damage coefficient corresponding to the crack state assessment subunit is calculated by the following formula:
[0018]
[0019] Among them, R2 is the crack damage coefficient corresponding to the crack state assessment subunit, H1 is the maximum longitudinal length of the crack in the key area of the T-beam, H2 is the maximum width of the crack in the key area of the T-beam, K1 is the total longitudinal length of the T-beam, and K2 is the crack width limit value of the T-beam.
[0020] In some possible implementations, the steel bar cover thickness damage coefficient corresponding to the steel bar cover thickness status assessment subunit is calculated by the following formula:
[0021]
[0022] Among them, R3 is the damage coefficient of the steel bar protective layer thickness, F1 is the test value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, F2 is the design value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, and P is the over-thickness limit of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam;
[0023] The concrete strength damage coefficient corresponding to the concrete strength status assessment subunit is calculated by the following formula:
[0024]
[0025] Among them, R4 is the concrete strength damage coefficient, Q1 is the concrete strength test value of the key area of the T beam, Q2 is the concrete strength design value of the key area of the T beam, and Q is the concrete strength over-limit value of the key area of the T beam.
[0026] In some possible implementations, the dynamic weighted calculation is performed in sequence according to the dynamic weighted coefficient and the structural state damage coefficient, and is calculated by the following formula:
[0027]
[0028] Among them, Pi is the dynamic weighting weight; Ri is the damage coefficient corresponding to different evaluation sub-units.
[0029] In some possible implementations, the reinforcement method is performed by reinforcing the T-beam through a reinforcement device, and the reinforcement device includes a reinforcement steel plate and a reinforcement rib arranged on the reinforcement steel plate;
[0030] The reinforcing steel plate and the T-beam are fixedly connected by anchors passing through the two; wherein adhesive material is poured between the fitting surfaces of the reinforcing steel plate and the T-beam, and adhesive is poured into the anchor holes of the anchors corresponding to the T-beam.
[0031] In some possible implementations, the step of reinforcing the concrete T-beam according to the selected reinforcement method includes:
[0032] Find out the steel bar situation in the key area of the T-beam and determine the drilling location points;
[0033] Drill anchor holes at the drilling locations using tools to reach a specified hole depth;
[0034] Clean the debris and dust inside and near the anchor hole;
[0035] Insert the anchor into the anchor hole, and sleeve the reinforcement steel plate onto the anchor for trial installation, adjust the hole position in time, and remove the anchor;
[0036] After temporarily fixing the reinforcing steel plate, pouring adhesive into the anchor hole, the adhesive filling 2 / 3 of the volume of the anchor hole;
[0037] Screw the anchor into the anchor hole and clean the adhesive overflowing from the surface;
[0038] After ensuring that the adhesive is completely hardened, a sufficient amount of low-viscosity adhesive material is injected into the gap between the reinforced steel plate and the outer structure of the flange plate of the T-beam, and a high-viscosity adhesive material is used to seal the contact position between the periphery of the reinforced steel plate and the T-beam.
[0039] In some possible implementations, the checking of the bearing capacity of the load-bearing section of the reinforced concrete T-beam includes:
[0040] The maximum load-bearing section of the T-beam is selected as the first calculation section, and the most severely damaged section of the T-beam is selected as the second calculation section;
[0041] Calculate the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section;
[0042] The structural performance of the T-beam after reinforcement is evaluated according to the structural bearing capacity.
[0043] In some possible implementations, calculating the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section includes:
[0044] According to the strain plane section assumption, the corresponding stresses of the first and second calculated sections are obtained from the section deformation:
[0045] According to the corresponding forces of the first calculated section and the second calculated section, the forces in each section are obtained:
[0046] The bearing capacities of multiple sections are calculated based on their respective stresses and respective forces:
[0047] The minimum cross-sectional bearing capacity is taken as the structural bearing capacity and compared with the design bearing capacity to judge whether the structural performance after the reinforcement meets the design requirements.
[0048] The method for maintaining the structural performance of a concrete T-beam after an impact provided in the present application can accurately understand the damage of the concrete T-beam after the impact by conducting a structural status assessment on the concrete T-beam, thereby providing a scientific basis for subsequent reinforcement plans; the specific reinforcement area and method are determined based on the results of the structural status assessment, so that the reinforcement work can be carried out in a targeted manner, which is conducive to saving costs and improving reinforcement efficiency; after construction is carried out according to the selected reinforcement method, the bearing capacity of the reinforced T-beam is checked to verify whether the reinforcement measures have achieved the expected goals, and whether the safety and bearing capacity of the original structure can be restored or even improved, thereby providing an accurate scientific basis for subsequent maintenance and reinforcement decisions, and ensuring structural safety performance and safe line operation. BRIEF DESCRIPTION OF THE DRAWINGS
[0049] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.
[0050] Figure 1 The present invention is a flowchart of a method for maintaining structural performance of a concrete T-beam after impact.
[0051] Figure 2 This is a schematic structural diagram of an exemplary reinforcement device on a T-beam structure involved in the present invention.
[0052] Figure 3 for Figure 2 Schematic diagram of the cross section of Ⅰ-Ⅰ.
[0053] Figure 4 It is a schematic diagram of calculating the cross-sectional bearing capacity in the method for maintaining the structural performance of a concrete T-beam after impact of the present invention.
[0054] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments.
[0055] Description of Reference Numerals
[0056] 10. Reinforcement steel plate; 20. T-beam; 30. Anchor; 40. Adhesive material. DETAILED DESCRIPTION
[0057] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme in the embodiment of the present application will be described in more detail below in conjunction with the drawings in the preferred embodiments of the present application. In the drawings, the same or similar reference numerals throughout represent the same or similar parts or parts with the same or similar functions. The described embodiments are part of the embodiments of the present application, not all of the embodiments. The embodiments described below with reference to the drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limitations on the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application. The embodiments of the present application are described in detail below in conjunction with the drawings.
[0058] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0059] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", 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 application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.
[0060] The terms "first", "second", "third", "fourth", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein.
[0061] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.
[0062] As mentioned in the background technology, the concrete T-beam structure is a widely used structural form in heavy-duty railways, highways, and municipal roads. This structural form can give full play to the good material properties of concrete and the stress-bearing performance of the beam structure, so as to achieve long-term durability and good load-bearing effect of the beam structure. my country's heavy-duty and passenger and freight railway bridges are mainly prestressed concrete T-beam bridges. The structural form has clear stress and simple structure, which can provide sufficient rigidity and stability for train operations. Prestressed concrete T-beams also have the advantages of high bearing capacity, low material consumption, low deadweight, good stability, and convenient construction and erection. It is a typical beam structure in bridge construction and is widely used in railway bridges.
[0063] As the application scope of railway concrete T-beam structures becomes wider and wider, the impact risk they face is becoming more and more significant. After the concrete T-beam encounters an impact, the structure needs to be inspected, evaluated and reinforced in time to reduce the impact of line interruption on the railway line. The commonly used reinforcement method is to reinforce the existing bridge structure by combining steel plates or steel components with concrete.
[0064] Various accidents have occurred in railway operations where over-height vehicles and ships collided with concrete T-beam structures, causing serious damage to the T-beam structures and causing line interruptions and other accidents. Concrete T-beam structures are often used to cross the intersections of railway lines and highway lines. After the concrete T-beam is damaged, there is a high probability of causing personal and property accidents. However, there is currently no method for comprehensive evaluation of the state of the concrete T-beam structure after being hit, and there is a lack of effective reinforcement schemes and analysis methods for the concrete T-beam structure. It is urgent to design reinforcement schemes and analyze calculation methods for the concrete T-beam structure after being hit to ensure the safety and operational performance of the concrete T-beam structure.
[0065] Based on the above related description, one or more embodiments of the present application provide a method for maintaining the structural performance of a concrete T-beam after impact, and the present application scheme is described below in conjunction with the accompanying drawings.
[0066] like Figure 1 As shown, the method for maintaining the structural performance of a concrete T-beam after impact provided by an embodiment of the present application includes:
[0067] Step 100, performing a structural status assessment step on the impacted concrete T-beam to obtain a structural status assessment result;
[0068] Step 200, determining the reinforcement area and reinforcement method of the concrete T-beam according to the structural state assessment result;
[0069] Step 300, reinforcing the concrete T-beam according to the selected reinforcement method;
[0070] Step 400, checking the bearing capacity of the load-bearing section of the reinforced concrete T-beam.
[0071] From the above description, it can be seen that the method for maintaining the structural performance of the concrete T-beam after impact in the embodiment of the present application can accurately understand the damage of the concrete T-beam after the impact by performing a structural status assessment on the concrete T-beam after the impact, thereby providing a scientific basis for the subsequent reinforcement plan; the specific reinforcement area and method are determined according to the results of the structural status assessment, so that the reinforcement work can be carried out in a targeted manner, which is conducive to saving costs and improving reinforcement efficiency; after construction according to the selected reinforcement method, the bearing capacity of the reinforced T-beam is checked to verify whether the reinforcement measures have achieved the expected goals, whether the safety and bearing capacity of the original structure can be restored or even improved, and provide a precise scientific basis for subsequent maintenance and reinforcement decisions, ensuring structural safety performance and safe line operation.
[0072] It should be noted that in the embodiment of the present application, the key area refers to the area where the T-beam bears greater stress, is sensitive to damage, and needs to be checked in detail. The setting of the key area is related to the shape and position of the T-beam, and there is no absolute limitation on this in the embodiment of the present application.
[0073] In some embodiments, in step 100, the structural state assessment calculation includes an appearance damage state assessment subunit, a crack state assessment subunit, a concrete strength state assessment subunit and a steel bar protective layer thickness state assessment subunit; each subunit corresponds to a structural state damage coefficient.
[0074] The performing of structural status evaluation calculation on the impacted concrete T-beam to obtain a structural status evaluation result also includes:
[0075] Step 101, determining a dynamic weighting coefficient, and performing dynamic weighted calculations in sequence according to the dynamic weighting coefficient and the structural state damage coefficient to obtain a plurality of structural state assessment results; wherein the dynamic weighting coefficients corresponding to different subunits have different proportions.
[0076] Here, the above-mentioned appearance damage status assessment subunit is to observe with the naked eye the appearance of the structure of the concrete T-beam after being hit, to check whether the concrete of the T-beam is obviously broken and missing, whether the concrete appearance of the beam body is obviously damaged, and whether the steel bars and steel strands of the beam body are obviously exposed and broken; the crack status assessment subunit is to observe and detect the crack status and crack width of the concrete T-beam structure, focusing on checking the crack status of the area near the impact position; the steel bar protective layer thickness status assessment subunit is to test the protective layer thickness of the steel bars in the concrete T-beam structure; the concrete strength status assessment subunit is to treat the concrete T-beam as a single component to test the concrete strength of the T-beam structure.
[0077] Professional testing instruments are required for the damage area test, crack width test, concrete strength test and steel bar cover thickness test. After the appearance inspection, crack detection, concrete strength test and steel bar cover thickness test, the state of the concrete T beam after the impact is comprehensively evaluated to determine whether the structure needs to be subjected to dynamic or static load tests.
[0078] Furthermore, the appearance damage coefficient corresponding to the appearance damage status assessment subunit is calculated by the following formula:
[0079]
[0080] Among them, R1 is the appearance damage coefficient corresponding to the appearance damage status assessment subunit, T1 is the area of the severely damaged area of the T-beam after the impact, T2 is the total damaged area of the T-beam after the impact, M1 is the area limit value of the severely damaged area of the T-beam, and M2 is the total inspection area of the T-beam after the impact.
[0081] In addition, the crack damage coefficient corresponding to the crack state assessment subunit is calculated by the following formula:
[0082]
[0083] Among them, R2 is the crack damage coefficient corresponding to the crack state assessment subunit, H1 is the maximum longitudinal length of the crack in the key area of the T-beam, H2 is the maximum width of the crack in the key area of the T-beam, K1 is the total longitudinal length of the T-beam, and K2 is the crack width limit value of the T-beam.
[0084] Similarly, the steel bar protection layer thickness damage coefficient corresponding to the steel bar protection layer thickness state assessment subunit is calculated by the following formula:
[0085]
[0086] Among them, R3 is the damage coefficient of the steel bar protective layer thickness, F1 is the test value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, F2 is the design value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, and P is the over-thickness limit of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam;
[0087] The concrete strength damage coefficient corresponding to the concrete strength status assessment subunit is calculated by the following formula:
[0088]
[0089] Among them, R4 is the concrete strength damage coefficient, Q1 is the concrete strength test value of the key area of the T beam, Q2 is the concrete strength design value of the key area of the T beam, and Q is the concrete strength over-limit value of the key area of the T beam.
[0090] After the damage coefficients corresponding to the subunits are calculated respectively, in step 101, dynamic weighted calculations are performed in sequence according to the dynamic weighted coefficients and the structural state damage coefficients, and the calculations are obtained by the following formula:
[0091]
[0092] Among them, Pi is the dynamic weighting weight; Ri is the damage coefficient corresponding to different evaluation sub-units.
[0093] In the appearance damage status assessment subunit, the crack status assessment subunit, the concrete strength status assessment subunit and the steel bar cover thickness status assessment subunit, the corresponding proportions of the dynamic weighted coefficients are: 20%, 40%, 30% and 10% respectively.
[0094] In the above embodiment, the proportions of dynamic weighting coefficients corresponding to data of different detection types are different. For example, as shown in Table 1, Table 1 shows the proportions of dynamic weighting coefficients corresponding to sub-units of different detection types.
[0095] Table 1
[0096] Different types of data Weight Appearance damage assessment subunit 20％ Crack status assessment subunit 40％ Concrete strength condition assessment subunit 30％ Steel bar cover thickness condition assessment subunit 10％
[0097] By assigning corresponding amplitude weights to data of different detection types, the proportion of different influencing factors in the damaged state can be adjusted more accurately, thereby improving the accuracy of state assessment.
[0098] The structural status assessment results calculated by the above formula are divided into five damage levels: slight, moderate, severe, serious and extremely serious according to the range of the theoretical maximum and minimum values of the final result R and the degree of damage.
[0099] The structural state of the concrete T-beam after impact is divided into four levels: A, B, C, and D. Level A is further divided into two levels: AA and A1. Level D is mild, level C is moderate, level B is severe, level A1 is severe, and level AA is extremely severe. The evaluation and measures involved in each degradation level are shown in Table 2 below:
[0100] Table 2
[0101]
[0102] Therefore, according to the calculated structural status assessment results, different status levels are determined, and the corresponding reinforcement method is selected according to the status level.
[0103] For example, Figure 2 and Figure 3 As shown, the reinforcement method is to reinforce the T beam 20 by a reinforcement device, and the reinforcement device includes a reinforcement steel plate 10 and a reinforcement rib arranged on the reinforcement steel plate 10;
[0104] The reinforcing steel plate 10 and the T-beam 20 are fixedly connected by an anchor 30 passing through the two; wherein an adhesive material 40 is poured between the fitting surfaces of the reinforcing steel plate 10 and the T-beam 20, and an adhesive is poured into the anchor hole of the anchor 30 corresponding to the T-beam 20.
[0105] Here, according to the above reinforcement device, in step 300, the concrete T-beam 20 is reinforced according to the selected reinforcement method, including:
[0106] Step 301, finding out the steel bar situation at the designated location and determining the location of the anchor hole;
[0107] Step 302, drilling a hole using a tool to a specified depth, with a hole diameter that meets the requirements for inserting the anchor 30;
[0108] Step 303: Use a high-intensity blower and a hair cleaner to clean the hole, and clean all debris and dust inside and near the anchor hole;
[0109] Step 304, insert all anchors 30, perform trial installation of the reinforcement steel plate 10, and adjust the hole positions in time;
[0110] Step 305: After the reinforced steel plate 10 is temporarily fixed, the uniformly mixed adhesive is injected into the anchor hole to fill 2 / 3 of the volume of the anchor hole;
[0111] Step 306: within the operable time, slowly screw the anchor 30 into the anchor hole, and a small amount of glue will overflow. Clean the overflowed glue on the surface, and do not disturb the anchor 30 during the curing period;
[0112] Step 307: After the glue is completely hardened, a sufficient amount of low-viscosity adhesive material 40 is injected into the gap between the reinforced steel plate 10 and the outer structure of the flange plate, and a high-viscosity adhesive material 40 is used to completely seal the contact position between the reinforced steel plate 10 and the reinforced structure.
[0113] In the above steps, the bonding material 40 may be a mortar with a certain viscosity. The reinforcement steel plate 10 may be two steel plates bonded to each other, wherein the reinforcement area corresponding to the reinforcement steel plate 10 is the impacted area or the severely damaged area. Exemplarily, the reinforcement steel plate 10 is formed by welding a plurality of steel plates, and the plurality of steel plates surround the bottom wrapping surface of the pillar of the T-beam 20, and the anchor 30 is a high-strength bolt that penetrates the reinforcement steel plate 10 and the T-beam 20 structure.
[0114] In some embodiments, in step 400, the checking of the bearing capacity of the load-bearing section of the reinforced concrete T-beam includes:
[0115] Step 401, selecting the maximum load-bearing section of the T-beam as the first calculation section, and selecting the most severely damaged section of the T-beam as the second calculation section;
[0116] Step 402, calculating the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section;
[0117] Step 403, evaluating the structural performance of the reinforced T-beam according to the structural bearing capacity.
[0118] Furthermore, in step 402, the calculating the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section includes:
[0119] According to the strain plane section assumption, the corresponding stresses of the first and second calculated sections are obtained from the section deformation:
[0120] According to the corresponding forces of the first calculated section and the second calculated section, the forces in each section are obtained:
[0121] The bearing capacities of multiple sections are calculated based on their respective stresses and respective forces:
[0122] The minimum cross-sectional bearing capacity is taken as the structural bearing capacity and compared with the design bearing capacity to judge whether the structural performance after the reinforcement meets the design requirements.
[0123] In the above step 402, the specific calculation process is as follows:
[0124] First, based on the strain plane section assumption, the corresponding stress is obtained from the cross-sectional deformation using the following formula:
[0125] σ c =ε c E c ;
[0126] σ s =ε s E s ;
[0127] Among them, σ c is the concrete stress; ε c is the concrete strain; E c is the elastic modulus of concrete; s is the steel bar stress; s is the steel bar strain; E s is the steel bar elastic modulus;
[0128] Similarly, the forces on the steel bars and concrete in the cross section are obtained based on the forces at various locations. The formula is as follows:
[0129] F c =σ c A c ;
[0130] F s =σ s A s ;
[0131] Among them, F c A is the concrete stress; c is the concrete area; F s F is the stress on the steel bar; s is the steel bar area;
[0132] Next, the forces and arm H of concrete and steel bars are calculated according to the equilibrium equation. The equilibrium equation is:
[0133] F c +F s =0;
[0134] Assuming that the cross section reaches the limit condition, calculate the cross section bearing capacity:
[0135] M=F s ;
[0136] Among them, M is the cross-sectional bearing capacity and H is the force arm.
[0137] Finally, the minimum M is obtained by comparison. mini As the bearing capacity after structural reinforcement, and compared with the design bearing capacity M de Compare and judge whether the structural performance after structural reinforcement meets the design requirements.
[0138] Figure 4 In the equation, Mmax1 and Mmin1 refer to the maximum and minimum bearing capacity values of the first check section, respectively. The minimum bearing capacity value M of the first check section is determined by comparing the two. min1 ;M max2 、M min2 They refer to the maximum and minimum bearing capacity values of the second check section respectively. The minimum bearing capacity value M of the second check section is determined by comparing the two. min2 ; Finally, the minimum bearing capacity value M of the first check section min1 and the smaller value of the bearing capacity of the second check section M min2 Compare and get the minimum bearing capacity value M mini , this value is consistent with the design bearing capacity M de Compare and determine whether the design requirements are met.
[0139] It should be noted that in the embodiment of the present application, since the damaged section (i.e., the second calculated section) and the maximum force section (i.e., the first calculated section) cannot be predicted in advance in the actual scenario, the first calculated section and the second calculated section may change in the actual scenario and are flexibly selected according to the actual scenario.
[0140] This design can fully guarantee the safety of the bearing capacity after reinforcement. In addition, the designed bearing capacity is the theoretical bearing capacity of the T-beam structure before impact, which will not be described in detail in the embodiments of this application.
[0141] The method for maintaining the structural performance of a concrete T-beam after impact provided in the embodiment of the present application has at least the following beneficial effects:
[0142] (1) Multiple key cross-section checks were performed, and the effects of the reinforced steel plate and high-strength mortar were considered. The bearing capacity of the reinforced concrete T-beam structure was obtained through comprehensive comparison to evaluate the bearing capacity of the reinforced structure.
[0143] (2) Two methods are used to reinforce the concrete T-beam after impact, which effectively ensures the reinforcement strength. One method is characterized by directly pasting steel plates and filling ordinary glue between the steel plates and the reinforced concrete T-beam to improve the structural performance of the concrete T-beam after impact; the second method is to fill high-strength mortar between the steel plates, and improve the bearing capacity of the T-beam structure after impact through the combined effect of mortar and steel plates.
[0144] (3) The damage status of the concrete T-beam flange plate structure, crack test, concrete strength test and steel bar protective layer thickness test are inspected, and the comprehensive status of the concrete T-beam structure is tested to evaluate the structural status of the concrete T-beam after the impact.
[0145] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the invention disclosed herein. The present application is intended to cover any modification, use or adaptation of the present application, which follows the general principles of the present application and includes common knowledge or customary techniques in the art that are not disclosed in the present application. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present application are indicated by the following claims.
[0146] It should be understood that the present application is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.
Claims
1. A method for maintaining structural performance of a concrete T-beam after impact, characterized in that: include: Perform structural status assessment calculation on the concrete T-beam after impact to obtain the structural status assessment result; Determining the reinforcement area and reinforcement method of the concrete T-beam according to the structural state assessment result; Reinforcing the concrete T-beam according to the selected reinforcement method; The bearing capacity of the load-bearing section of the reinforced concrete T-beam is checked.
2. The method for maintaining structural performance of a concrete T-beam after impact according to claim 1, characterized in that: The structural state assessment calculation includes an appearance damage state assessment subunit, a crack state assessment subunit, a concrete strength state assessment subunit and a steel bar protective layer thickness state assessment subunit; each subunit corresponds to a structural state damage coefficient; The performing structural status evaluation calculation on the impacted concrete T-beam to obtain a structural status evaluation result also includes: Determine a dynamic weighting coefficient, and perform dynamic weighted calculations in sequence according to the dynamic weighting coefficient and the structural state damage coefficient to obtain a plurality of structural state assessment results; wherein the dynamic weighting coefficients corresponding to different subunits have different proportions.
3. The method for maintaining structural performance of a concrete T-beam after impact according to claim 2, characterized in that: The appearance damage coefficient corresponding to the appearance damage status assessment subunit is calculated by the following formula: Among them, R1 is the appearance damage coefficient corresponding to the appearance damage status assessment subunit, T1 is the area of the severely damaged area of the T-beam after the impact, T2 is the total damaged area of the T-beam after the impact, M1 is the area limit value of the severely damaged area of the T-beam, and M2 is the total inspection area of the T-beam after the impact.
4. The method for maintaining structural performance of a concrete T-beam after impact according to claim 3 is characterized in that: The crack damage coefficient corresponding to the crack state assessment subunit is calculated by the following formula: Among them, R2 is the crack damage coefficient corresponding to the crack state assessment subunit, H1 is the maximum longitudinal length of the crack in the key area of the T-beam, H2 is the maximum width of the crack in the key area of the T-beam, K1 is the total longitudinal length of the T-beam, and K2 is the crack width limit value of the T-beam.
5. The method for maintaining structural performance of a concrete T-beam after impact according to claim 4, characterized in that: The steel bar protection layer thickness damage coefficient corresponding to the steel bar protection layer thickness state assessment subunit is calculated by the following formula: Among them, R3 is the damage coefficient of the steel bar protective layer thickness, F1 is the test value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, F2 is the design value of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam, and P is the over-thickness limit of the transverse steel bar protective layer thickness of the upper layer of the flange plate in the key area of the T beam; The concrete strength damage coefficient corresponding to the concrete strength status assessment subunit is calculated by the following formula: Among them, R4 is the concrete strength damage coefficient, Q1 is the concrete strength test value of the key area of the T beam, Q2 is the concrete strength design value of the key area of the T beam, and Q is the concrete strength over-limit value of the key area of the T beam.
6. The method for maintaining structural performance of a concrete T-beam after impact according to claim 5, characterized in that: The dynamic weighted calculation is performed in sequence according to the dynamic weighted coefficient and the structural state damage coefficient, and is calculated by the following formula: Among them, Pi is the dynamic weighting weight; Ri is the damage coefficient corresponding to different evaluation sub-units.
7. The method for maintaining structural performance of a concrete T-beam after impact according to claim 1, characterized in that: The reinforcement method is to reinforce the T-beam by a reinforcement device, wherein the reinforcement device comprises a reinforcement steel plate and a reinforcement rib arranged on the reinforcement steel plate; The reinforcing steel plate and the T-beam are fixedly connected by anchors passing through the two; wherein adhesive material is poured between the fitting surfaces of the reinforcing steel plate and the T-beam, and adhesive is poured into the anchor holes of the anchors corresponding to the T-beam.
8. The method for maintaining the structural performance of a concrete T-beam after impact according to claim 7, characterized in that: The step of reinforcing the concrete T-beam according to the selected reinforcement method includes: Find out the steel bar situation in the key area of the T-beam and determine the drilling location points; Drill anchor holes at the drilling locations using tools to reach a specified hole depth; Clean the debris and dust inside and near the anchor hole; Insert the anchor into the anchor hole, and sleeve the reinforcement steel plate onto the anchor for trial installation, adjust the hole position in time, and remove the anchor; After temporarily fixing the reinforcing steel plate, pouring adhesive into the anchor hole, the adhesive filling 2 / 3 of the volume of the anchor hole; Screw the anchor into the anchor hole and clean the adhesive overflowing from the surface; After ensuring that the adhesive is completely hardened, a sufficient amount of low-viscosity adhesive material is injected into the gap between the reinforced steel plate and the outer structure of the flange plate of the T-beam, and a high-viscosity adhesive material is used to seal the contact position between the periphery of the reinforced steel plate and the T-beam.
9. The method for maintaining structural performance of a concrete T-beam after impact according to any one of claims 1 to 8, characterized in that: The checking of the bearing capacity of the load-bearing section of the reinforced concrete T-beam includes: The maximum load-bearing section of the T-beam is selected as the first calculation section, and the most severely damaged section of the T-beam is selected as the second calculation section; Calculate the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section; The structural performance of the T-beam after reinforcement is evaluated according to the structural bearing capacity.
10. The method for maintaining structural performance of a concrete T-beam after impact according to claim 9, characterized in that: The calculating the structural bearing capacity of the T-beam according to the first calculated cross section and the second calculated cross section comprises: According to the strain plane section assumption, the corresponding stresses of the first and second calculated sections are obtained from the section deformation: According to the corresponding forces of the first calculated section and the second calculated section, the forces in each section are obtained: The bearing capacities of multiple sections are calculated based on their respective stresses and respective forces: The minimum cross-sectional bearing capacity is taken as the structural bearing capacity and compared with the design bearing capacity to judge whether the structural performance after the reinforcement meets the design requirements.