Railway simply supported girder bridge strong earthquake response parameter analysis model

Abstract

The invention provides a railway simply supported girder bridge strong earthquake response parameter analysis model, and a modeling method of a railway simply supported girder bridge comprises the following steps: carrying out structural analysis on the railway simply supported girder bridge, and decomposing the railway simply supported girder bridge into a plurality of structural units, each structural unit comprises a pile foundation, a pier, a support structure, an anti-falling beam device, a beam structure and a fastening connecting piece; three-dimensional solid modeling is conducted on a pile foundation, a bridge pier, a support structure, an anti-falling beam structure, a beam structure and a fastening connecting piece, and the support structure, the anti-falling beam structure and the beam structure are all arranged to be elastic-plastic structural pieces; a pile foundation, a bridge pier, a support structure, an anti-falling beam structure, a beam structure and a fastening connecting piece are assembled, the bridge pier is arranged on the pile foundation, the beam structure is connected to the bridge pier through the support structure, and the beam structure and the support structure are connected into a whole through the fastening connecting piece. The anti-falling beam structure is connected with the beam structure through a fastening connecting piece, and an assembly gap is formed between the anti-falling beam structure and the support structure.

Description

Technical Field

[0001] The present invention relates to the technical field of disaster prevention and mitigation of bridge engineering, and in particular to a modeling method of a railway simply supported beam bridge and an analysis method of strong earthquake response parameters. Background Art

[0002] This section merely provides background information related to the present disclosure and is not necessarily prior art.

[0003] At present, in the current large-scale railway construction, simply supported beams are an important part of railway design, especially in railway bridge structures, where they are widely used. Under the realistic conditions of tight construction period and short design cycle, the optimization of bridge structure design is an important task.

[0004] There are two common methods for analyzing bridge structures:

[0005] One method is to install seismic components in the bridge structure, but in the specific analysis process, the seismic components are not destroyed. Under this condition, a model is established for analysis based on the earthquake response characteristics. However, there are certain limitations. The disadvantage is that since the seismic components are not destroyed, the bridge structure cannot enter a large deformation state, so it cannot be analyzed in combination with actual conditions.

[0006] Another method is to install energy-absorbing components (such as viscous dampers) in the bridge structure, and establish a model for analysis based on the characteristics of earthquake response under this condition. This analysis method still has certain limitations. The disadvantage is that it does not consider the reduction effect of seismic components on seismic loads. In actual engineering, bridge components are generally designed to have a certain seismic resistance to withstand the impact force generated by smaller earthquakes. Only under extremely severe conditions such as high earthquake levels will seismic components fail and shock-absorbing energy-absorbing devices play a role.

[0007] Both of the above analysis methods have certain deviations from the actual conditions faced by bridges under strong earthquake conditions, which directly leads to low calculation accuracy and affects the design and improvement of railway bridges. Summary of the invention

[0008] The purpose of the present invention is to at least solve how to simulate a railway simply supported beam bridge more realistically under strong earthquake conditions to meet the dynamic nonlinear and large deformation analysis requirements of the railway simply supported beam bridge. Therefore, a modeling method for a railway simply supported beam bridge is proposed.

[0009] This purpose is achieved through the following technical solutions:

[0010] A first aspect of the present invention provides a modeling method for a railway simply supported beam bridge, the modeling method for a railway simply supported beam bridge comprising:

[0011] Performing structural analysis on a railway simply supported beam bridge, decomposing the railway simply supported beam bridge into a plurality of structural units, each of which includes a pile foundation, a bridge pier, a support structure, a beam-falling prevention device, a beam structure, and a fastening connector;

[0012] Performing three-dimensional solid modeling on the pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector, wherein the support structure, the anti-fall beam structure and the beam structure are all configured as elastic-plastic structural members;

[0013] The pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector are assembled, wherein the bridge pier is arranged on the pile foundation, the beam structure is connected to the bridge pier through the support structure, and the beam structure and the support structure are connected as a whole through the fastening connector, the anti-fall beam structure is connected to the beam structure through the fastening connector and an assembly gap is provided between the anti-fall beam structure and the support structure.

[0014] In addition, the modeling method of the railway simply supported beam bridge according to the present invention may also have the following additional technical features:

[0015] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge includes:

[0016] Performing structural analysis on a railway simply supported beam bridge, decomposing the railway simply supported beam bridge into a plurality of structural units, each of which includes a pile foundation, a bridge pier, a support structure, a beam-falling prevention device, a beam structure, and a fastening connector;

[0017] Performing three-dimensional solid modeling on the pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector, wherein the support structure, the anti-fall beam structure and the beam structure are all configured as elastic-plastic structural members;

[0018] The pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector are assembled, wherein the bridge pier is arranged on the pile foundation, the beam structure is connected to the bridge pier through the support structure, and the beam structure and the support structure are connected as a whole through the fastening connector, the anti-fall beam structure is connected to the beam structure through the fastening connector and an assembly gap is provided between the anti-fall beam structure and the support structure.

[0019] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0020] A first support, a second support, a third support and a fourth support are respectively arranged at different positions of the pier, the first support, the second support, the third support and the fourth support jointly support the beam structure, and the first support, the second support, the third support and the fourth support are all connected to the beam structure through the fastening connector.

[0021] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0022] Setting the first support as a bidirectional movable support;

[0023] The second support is set as a longitudinal movable support;

[0024] The third support is set as a transverse movable support;

[0025] The fourth support is configured as a fixed support.

[0026] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0027] The first support, the second support, the third support and the fourth support are respectively connected to the pier through supporting members.

[0028] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0029] The fastening connector is configured as a fail-safe component; and / or the anti-fall beam structure is configured as a fail-safe component.

[0030] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0031] In the process of 3D solid modeling, C3D8R hexahedral mesh and / or C3D6 wedge mesh are used;

[0032] The support structure and the anti-fall beam structure are both finely modeled using solid elements.

[0033] The second aspect of the present invention further provides a method for analyzing strong earthquake response parameters, the method for analyzing strong earthquake response parameters comprising:

[0034] Modeling is performed according to the modeling method for a railway simply supported beam bridge as described in any one of the above items;

[0035] gradually applying a horizontal force to the beam structure so that the support structure is in a linear elastic working stage, and recording the maximum deformation generated by the horizontal force and the support structure;

[0036] Continue to apply horizontal force to the beam structure, so that the support structure is in an elastic-plastic working stage;

[0037] Continue to apply the horizontal force until the support structure reaches the bearing limit and fails;

[0038] A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation produced by the support structure as the abscissa.

[0039] In some embodiments of the present invention, the method for analyzing strong earthquake response parameters further includes:

[0040] Apply forces in two opposite directions in the horizontal plane, and repeat the above steps to draw a first curve graph corresponding to the support structure.

[0041] In some embodiments of the present invention, the modeling method of the railway simply supported beam bridge further includes:

[0042] Applying a horizontal force to the beam structure, and generating a horizontal displacement a of the beam structure;

[0043] Continue to apply a horizontal force to the beam structure, the anti-fall beam structure is in a linear elastic working stage, and record the horizontal force and the maximum deformation of the anti-fall beam structure;

[0044] Continue to apply horizontal force to the beam structure, so that the anti-fall beam structure is in an elastic-plastic working stage;

[0045] Continue to apply the horizontal force until the anti-fall beam structure reaches the bearing limit and fails;

[0046] A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation produced by the anti-fall beam structure as the abscissa.

[0047] In some embodiments of the present invention, the method for analyzing strong earthquake response parameters further includes:

[0048] Apply forces in two opposite directions in the horizontal plane, and repeat the above steps to draw a second curve graph corresponding to the anti-fall beam structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0050] Figure 1A structural unit of a railway simply supported beam bridge constructed by the modeling method of the railway simply supported beam bridge provided by the present invention is illustrated;

[0051] Figure 2 A schematic diagram of a bridge pier, a support structure, and an anti-falling beam structure on one side constructed by the modeling method of a railway simply supported beam bridge provided by the present invention is illustrated;

[0052] Figure 3 A schematic diagram of the bridge pier, support structure, and anti-fall beam structure on the other side constructed by the modeling method of the railway simply supported beam bridge provided by the present invention is illustrated;

[0053] Figure 4 A schematic diagram of the structure of the railway simply supported beam bridge of the present invention is shown, wherein the assembly gap is shown;

[0054] Figure 5 A schematic diagram of the anti-falling beam structure of the railway simply supported beam bridge of the present invention is shown;

[0055] Figure 6 The structural schematic diagram of the first support of the railway simply supported beam bridge of the present invention is shown;

[0056] Figure 7 The structural schematic diagram of the second support of the railway simply supported beam bridge of the present invention is shown;

[0057] Figure 8 The schematic diagram of the structure of the third support of the railway simply supported beam bridge of the present invention is shown;

[0058] Fig. 9 A schematic structural diagram of the fourth support of the railway simply supported beam bridge of the present invention is shown;

[0059] Fig.10 A first curve graph drawn according to the analysis method of strong earthquake response parameters provided by the present invention is illustrated;

[0060] Fig.11 The second graph drawn according to the analysis method of strong earthquake response parameters provided by the present invention is illustrated.

[0061] The reference numerals are as follows:

[0062] 100. Structural unit;

[0063] 110. Bridge piers;

[0064] 120, support structure; 121, first support; 122, second support; 123, third support; 124, fourth support;

[0065] 130. Anti-fall beam structure; 140. Beam structure; 150. Fastening connector;

[0066] 160, support member;

[0067] a. Assembly clearance. DETAILED DESCRIPTION

[0068] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0069] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0070] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0071] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both upper and lower orientations. The device can be oriented otherwise (rotated 90 degrees or in other directions) and the spatial relative descriptors used in the text are interpreted accordingly.

[0072] An embodiment of a modeling method for a railway simply supported beam bridge and an analysis method for strong earthquake response parameters of the present invention is given below in conjunction with the accompanying drawings. The drawings and embodiments are only used to explain the present invention and should not be construed as limiting the present invention.

[0073] The present invention provides a modeling method for a railway simply supported beam bridge, and the modeling method for a railway simply supported beam bridge comprises the following steps:

[0074] A structural analysis is performed on a railway simply supported beam bridge, and the railway simply supported beam bridge is decomposed into a plurality of structural units 100 , each structural unit 100 includes a pile foundation, a pier 110 , a support structure 120 , an anti-falling beam structure 130 , a beam structure 140 , and a fastening connector 150 .

[0075] The pile foundation, the bridge pier 110, the support structure 120, the anti-fall beam structure 130, the beam structure 140 and the fastening connector 150 are subjected to three-dimensional solid modeling, wherein the support structure 120, the anti-fall beam structure 130 and the beam structure 140 are all configured as elastic-plastic structural members.

[0076] The pile foundation, the pier 110, the support structure 120, the anti-falling beam structure 130, the beam structure 140 and the fastening connector 150 are assembled, wherein the pier 110 is arranged on the pile foundation, the beam structure 140 is connected to the pier 110 through the support structure 120, and the beam structure 140 and the support structure 120 are connected as a whole through the fastening connector 150, and the anti-falling beam structure 130 is connected to the beam structure 140 through the fastening connector 150 and an assembly gap a is provided between the anti-falling beam structure 130 and the support structure 120.

[0077] According to the modeling method of the railway simply supported beam bridge provided by the present invention, the strong earthquake response parameter analysis model of the railway simply supported beam bridge constructed is more in line with the actual situation of the railway bridge, and can organically combine the seismic calculation analysis with the energy consumption and shock absorption calculation analysis to meet the needs of dynamic nonlinear and large deformation analysis of the railway bridge.

[0078] Figure 1 FIG. 1 illustrates a structural unit of a railway simply supported beam bridge constructed by the modeling method of the railway simply supported beam bridge provided by the present invention; Figure 1 As shown, according to the modeling method of the railway simply supported beam bridge provided by the present invention, after the structural analysis of the railway simply supported beam bridge, each structural unit 100 of the railway simply supported beam bridge is divided into a pile foundation, a pier 110, a support structure 120, an anti-falling beam device, a beam structure 140, and a fastening connector 150. Each part is simplified using linear units, and finally an analysis model of the entire bridge is constructed, so that the macroscopic phenomena and macroscopic mechanical indicators of the entire bridge damage can be obtained.

[0079] The pile foundation, bridge pier 110, and beam structure 140 all adopt three-dimensional space beam units that can consider three translational and three rotational degrees of freedom. The support structure 120 and the anti-fall beam structure 130 adopt elastic-plastic connection units that can consider three translational and three rotational degrees of freedom. The linear unit has the advantages of a small number of nodes, units, and degrees of freedom. It converges quickly when performing nonlinear time-history analysis, which can improve the efficiency of calculation and analysis.

[0080] The use of the full bridge model takes into account the mutual influence and action between the bridge spans or between the various structural units 100, thereby avoiding the deficiency of being unable to consider the mutual influence and action between the bridge spans when analyzing according to the single pier 110 model.

[0081] The modeling method of the railway simply supported beam bridge provided by the present invention constructs an analysis model of the whole bridge. A finite element model of the whole bridge in which all components adopt three-dimensional solid units can simulate the whole process of bridge destruction under earthquake action. By analyzing the normal operation and destruction of the support structure 120, the sliding of the beam structure 140, the collision of the anti-fall beam structure 130 and other processes, the mechanical behavior of each detailed component of the bridge can be obtained.

[0082] The modeling method of the railway simply supported beam bridge provided by the present invention constructs an analysis model of the whole bridge. The fastening connector 150 includes shear pins, anchor bolts, etc., which keep normal operation during common earthquakes or design earthquakes and can serve as the first line of defense for structural earthquake resistance. When encountering rare earthquakes, the above shear pins, anchor bolts, etc. can be destroyed and used as failable components to absorb part of the seismic energy, thereby achieving a reduction effect on the seismic force, so that the seismic calculation analysis and the energy consumption and shock absorption calculation analysis are organically combined. When the shear pins, anchor bolts, etc. are destroyed, the anti-falling beam device enters the working state, forming the second line of defense for structural earthquake resistance.

[0083] By adopting the modeling method of the railway simply supported beam bridge provided by the present invention, since the support structure 120 can be easily replaced after an earthquake, the operation of the railway can be quickly restored.

[0084] The modeling method of the railway simply supported beam bridge provided by the present invention adopts three-dimensional solid units for the support structure 120 and the anti-fall beam structure 130. By defining parameters such as a sliding type restoring force model and a restoring force model considering steel hardening, the requirements for dynamic nonlinearity and large deformation analysis of the bridge can be met, and the analysis of shear pins, anchor bolts, etc. before and after failure can be simplified into one step, thereby improving the calculation efficiency and analysis efficiency to a certain extent.

[0085] In one embodiment of the present invention, the modeling method of a railway simply supported beam bridge also includes: respectively setting a first support 121, a second support 122, a third support 123 and a fourth support 124 at different positions of the pier 110, the first support 121, the second support 122, the third support 123 and the fourth support 124 jointly supporting the beam structure 140, and the first support 121, the second support 122, the third support 123 and the fourth support 124 are all connected to the beam structure 140 via a fastening connector 150.

[0086] in, Figure 6 The structural schematic diagram of the first support of the railway simply supported beam bridge of the present invention is shown; Figure 7 The structural schematic diagram of the second support of the railway simply supported beam bridge of the present invention is shown; Figure 8 The schematic diagram of the structure of the third support of the railway simply supported beam bridge of the present invention is shown; Fig. 9 A schematic structural diagram of the fourth support of the railway simply supported beam bridge of the present invention is shown;

[0087] In one embodiment of the present invention, the modeling method of a railway simply supported beam bridge also includes: setting the first support 121 as a bidirectional movable support; setting the second support 122 as a longitudinal movable support; setting the third support 123 as a transverse movable support; and setting the fourth support 124 as a fixed support. Figure 2 A schematic diagram of a bridge pier 110, a support structure 120, and an anti-falling beam structure 130 on one side constructed by the modeling method of a railway simply supported beam bridge provided by the present invention is illustrated; Figure 3 The schematic diagram of the bridge pier 110, the support structure 120, and the anti-falling beam structure 130 on the other side constructed by the modeling method of the railway simply supported beam bridge provided by the present invention is illustrated;

[0088] In one embodiment of the present invention, the modeling method of a railway simply supported beam bridge further includes: setting the fastening connector 150 as a failable component; and / or setting the anti-fall beam structure 130 as a failable component.

[0089] In one embodiment of the present invention, the modeling method of the railway simply supported beam bridge also includes: in the process of three-dimensional solid modeling, using C3D8R hexahedral grid and / or C3D6 wedge grid, the support structure 120 and the anti-fall beam structure 130 are both modeled in a refined manner using solid units.

[0090] In one embodiment of the present invention, the modeling method of a railway simply supported beam bridge further includes:

[0091] The first support 121 , the second support 122 , the third support 123 and the fourth support 124 are respectively connected to the pier 110 through the support members 160 .

[0092] According to the modeling method of the railway simply supported beam bridge provided by the present invention, after the whole bridge is modeled, it has the following advantages:

[0093] First, by adopting the three-dimensional solid unit model support structure 120 and the anti-fall beam structure 130, the whole process mechanical behavior of bridge destruction under strong earthquake action can be simulated.

[0094] Second, by setting up failable components, the seismic analysis calculation and the energy dissipation and seismic reduction analysis calculation are organically combined, and the reduction effect of failed components on seismic force is considered, which is more in line with the actual situation.

[0095] Third, after some earthquake-resistant components in the calculation model, such as shear pins and anchor bolts, fail, the energy-absorbing components or the anti-fall beam structure 130 play a role, which can meet the needs of dynamic nonlinear and large deformation analysis of the bridge.

[0096] Fourth, by designing the finite element unit restoring force model of the failable component and the anti-fall beam structure 130, when performing seismic design on the bridge, the analysis of the working stages of the two types of components can be simplified into one step, which reduces the calculation and analysis workload to a certain extent.

[0097] The present invention also provides a method for analyzing strong earthquake response parameters, characterized in that the method for analyzing strong earthquake response parameters comprises:

[0098] Modeling is performed according to the modeling method of a railway simply supported beam bridge in any of the above embodiments;

[0099] Gradually apply a horizontal force to the beam structure 140 to put the support structure 120 in a linear elastic working stage, and record the horizontal force and the maximum deformation of the support structure 120;

[0100] Continue to apply horizontal force to the beam structure 140 to put the support structure 120 in an elastic-plastic working stage;

[0101] Continue to apply the horizontal force until the support structure 120 reaches the bearing limit and fails;

[0102] A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation of the support structure 120 as the abscissa.

[0103] In one embodiment of the method for analyzing strong earthquake response parameters of the present invention, forces are applied in two opposite directions in the horizontal plane, and the above steps are repeated to draw a first curve graph corresponding to the support structure.

[0104] Fig.10 FIG. 4 illustrates a first curve diagram drawn according to the analysis method of strong earthquake response parameters provided by the present invention, such as Fig.10 As shown, the first support 121, the second support 122, the third support 123 and the fourth support 124 are all set as failable components. When the horizontal seismic force is less than Fy, the support structure 120 is in the linear elastic working stage for the unit in the model. When the seismic force reaches Fy, the support structure 120 enters the elastoplastic working stage. When the seismic force reaches Fu, the failable component of the support reaches the bearing capacity limit state and fracture occurs, and the corresponding deformation is δu. When the seismic action acts in the reverse direction, the process is the same as the forward action, but when unloading and loading in the elastoplastic stage, a strain hardening effect will occur, that is, Fy will increase.

[0105] In one embodiment of the present invention, the method for analyzing railway strong earthquake response parameters further includes:

[0106] A horizontal force is applied to the beam structure 140, and the beam structure 140 generates a horizontal displacement a;

[0107] Continue to apply horizontal force to the beam structure 140, the anti-falling beam structure 130 is in the linear elastic working stage, and record the horizontal force and the maximum deformation of the anti-falling beam structure 130;

[0108] Continue to apply horizontal force to the beam structure 140 to make the anti-fall beam structure 130 in an elastic-plastic working stage;

[0109] Continue to apply the horizontal force until the anti-fall beam structure 130 reaches the bearing limit and fails;

[0110] A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation of the anti-falling beam structure 130 as the abscissa.

[0111] In one embodiment of the method for analyzing strong earthquake response parameters of the present invention, forces are applied in two opposite directions in the horizontal plane, and the above steps are repeated to draw a second curve graph corresponding to the anti-fall beam structure 130 .

[0112] Fig.11Schematic diagram of a second curve graph drawn according to the analysis method of strong earthquake response parameters provided by the present invention, such as Fig.11 As shown, combined Figure 1 , Figure 2 and Figure 3 The transverse anti-falling beam structures 130 are arranged in pairs, that is, after the transverse horizontal earthquake action causes the failure of the failable components such as the support bolts or anchor bolts, each pair of anti-falling beam structures 130 provides horizontal supporting forces in different directions for the reciprocating seismic force to prevent the beam structure 140 from falling.

[0113] Wherein a is the gap between the anti-drop beam and the box beam. When considering the stiffness of the rubber pad or the friction force of the bearing failure surface, this line segment can be set with a certain slope. When moving smoothly as a rigid body, this line segment coincides with the horizontal axis. The gap is simulated by a hook unit or a friction contact unit in the finite element model. When the structural displacement exceeds the gap, the anti-drop beam structure 130 starts to work. When the horizontal seismic force is less than Fy, the unit of the anti-drop beam component in the model is in the linear elastic working stage. When the seismic force reaches Fy, the anti-drop beam enters the elastic-plastic working stage. However, when the anti-drop beam reaches the ultimate bearing capacity, it is destroyed and unloaded and the reverse seismic force is applied, a slip effect D1(+)+a+a is generated. After that, another anti-drop beam component acts on the reverse seismic force, and the same double-broken line restoring force model is also used.

[0114] The modeling method of the railway simply supported beam bridge and the analysis method of the strong earthquake response parameters of the present invention are aimed at actual production problems and problems existing in the existing calculation and analysis models. How to combine the actual simply supported beam bridge conditions, optimize the analysis model, and perform fast and effective modeling, calculation and analysis in the design stage to meet the needs of dynamic nonlinearity and large deformation analysis of the bridge, improve design efficiency and calculation accuracy, and can be widely used in actual engineering is a key issue that we urgently need to solve and study.

[0115] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A modeling method for a railway simply supported beam bridge, characterized in that: The modeling method of the railway simply supported beam bridge comprises: Performing structural analysis on a railway simply supported beam bridge, decomposing the railway simply supported beam bridge into a plurality of structural units, each of which includes a pile foundation, a bridge pier, a support structure, a beam-falling prevention device, a beam structure, and a fastening connector; Performing three-dimensional solid modeling on the pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector, wherein the support structure, the anti-fall beam structure and the beam structure are all configured as elastic-plastic structural members; The pile foundation, the bridge pier, the support structure, the anti-fall beam structure, the beam structure and the fastening connector are assembled, wherein the bridge pier is arranged on the pile foundation, the beam structure is connected to the bridge pier through the support structure, and the beam structure and the support structure are connected as a whole through the fastening connector, the anti-fall beam structure is connected to the beam structure through the fastening connector and an assembly gap is provided between the anti-fall beam structure and the support structure.

2. The modeling method of a railway simply supported beam bridge according to claim 1, characterized in that: The modeling method of the railway simply supported beam bridge also includes: A first support, a second support, a third support and a fourth support are respectively arranged at different positions of the pier, the first support, the second support, the third support and the fourth support jointly support the beam structure, and the first support, the second support, the third support and the fourth support are all connected to the beam structure through the fastening connector.

3. The modeling method of a railway simply supported beam bridge according to claim 2, characterized in that: The modeling method of the railway simply supported beam bridge also includes: Setting the first support as a bidirectional movable support; The second support is set as a longitudinal movable support; The third support is set as a transverse movable support; The fourth support is configured as a fixed support.

4. The modeling method of a railway simply supported beam bridge according to claim 3, characterized in that: The modeling method of the railway simply supported beam bridge also includes: The first support, the second support, the third support and the fourth support are respectively connected to the pier through supporting members.

5. The modeling method of a railway simply supported beam bridge according to claim 2, characterized in that: The modeling method of the railway simply supported beam bridge also includes: The fastening connector is configured as a fail-safe component; and / or the anti-fall beam structure is configured as a fail-safe component.

6. The modeling method of a railway simply supported beam bridge according to claim 2, characterized in that: The modeling method of the railway simply supported beam bridge also includes: In the process of 3D solid modeling, C3D8R hexahedral mesh and / or C3D6 wedge mesh are used; The support structure and the anti-fall beam structure are both finely modeled using solid elements.

7. A method for analyzing strong earthquake response parameters, characterized in that: The analysis method of the strong earthquake response parameters includes: Modeling is performed according to the modeling method for a railway simply supported beam bridge according to any one of claims 1 to 6; gradually applying a horizontal force to the beam structure so that the support structure is in a linear elastic working stage, and recording the maximum deformation generated by the horizontal force and the support structure; Continue to apply horizontal force to the beam structure, so that the support structure is in an elastic-plastic working stage; Continue to apply the horizontal force until the support structure reaches the bearing limit and fails; A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation produced by the support structure as the abscissa.

8. The method for analyzing strong earthquake response parameters according to claim 7, characterized in that: The analysis method of the strong earthquake response parameters also includes: Apply forces in two opposite directions in the horizontal plane, and repeat the above steps to draw a first curve graph corresponding to the support structure.

9. The modeling method of a railway simply supported beam bridge according to claim 7, characterized in that: The modeling method of the railway simply supported beam bridge also includes: Applying a horizontal force to the beam structure, and generating a horizontal displacement a of the beam structure; Continue to apply a horizontal force to the beam structure, the anti-fall beam structure is in a linear elastic working stage, and record the horizontal force and the maximum deformation of the anti-fall beam structure; Continue to apply horizontal force to the beam structure, so that the anti-fall beam structure is in an elastic-plastic working stage; Continue to apply the horizontal force until the anti-fall beam structure reaches the bearing limit and fails; A curve graph is drawn with the horizontal force as the ordinate and the maximum deformation produced by the anti-fall beam structure as the abscissa.

10. The method for analyzing strong earthquake response parameters according to claim 9, characterized in that: The analysis method of the strong earthquake response parameters also includes: Apply forces in two opposite directions in the horizontal plane, and repeat the above steps to draw a second curve graph corresponding to the anti-fall beam structure.

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