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Seismic collapse judgment method of reinforced concrete beam bridge based on energy balance

A reinforced concrete and energy balance technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the mechanism of collapse, the failure process cannot be fully revealed, the specific moment of structural collapse cannot be accurately analyzed, and the judgment one by one is cumbersome and other issues to achieve an effect that is conducive to accuracy and authenticity

Active Publication Date: 2019-03-08
JIANGSU OPEN UNIV
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Problems solved by technology

The above two types of structure-based collapse criteria have a large safety margin, which is beneficial to design and use, but they cannot accurately analyze the specific moment of structural collapse, and cannot fully reveal the collapse mechanism and failure process, and judge the failure criteria of multiple components one by one. more cumbersome

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  • Seismic collapse judgment method of reinforced concrete beam bridge based on energy balance
  • Seismic collapse judgment method of reinforced concrete beam bridge based on energy balance
  • Seismic collapse judgment method of reinforced concrete beam bridge based on energy balance

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specific Embodiment 1

[0035] combine figure 1 , figure 2 , the present invention proposes a method for judging the earthquake collapse of reinforced concrete girder bridges based on energy balance, said method comprising the following steps:

[0036] S1: Create an overall analysis finite element model of the reinforced concrete girder bridge structure. Based on the overall analysis finite element model, determine the input direction of earthquake action and the combination mode of earthquake action components.

[0037] Preferably, according to the design drawings of the research object, the overall analysis finite element model of the reinforced concrete beam bridge structure is established, and the earthquake action input is determined for the established reinforced concrete continuous beam bridge structure finite element model according to the importance of the research object and the actual demand situation. Combination of direction and seismic action components.

[0038]S2: Select n types of...

specific Embodiment 2

[0053] The two-span continuous girder bridge with a main girder length of 14.2m has a cross-section of two T-beams, and the lower pier column is a reinforced concrete solid double-column pier. The concrete strength of the beam and pier is C30, and the longitudinal reinforcement is HPB235.

[0054] First, according to the structural design drawings, the general finite element software is used to establish the overall finite element model of the full bridge structure. Concrete is simulated by solid element, and steel bar is simulated by rod element. The common node connection between steel bar and concrete is adopted, and the slippage and fracture of steel bar and the constraint effect of steel bar on concrete are not considered. The support adopts the spring unit, and the additional mass block adopts the mass unit to simulate.

[0055] Secondly, according to the importance and actual demand of the two-span continuous girder bridge, the seismic action input direction of the esta...

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Abstract

The invention provides a seismic collapse judgment method of a reinforced concrete beam bridge based on energy balance, comprising the following steps of S1 establishing an overall analysis finite element model of a reinforced concrete beam bridge structure, and determining an earthquake action input direction and a combination mode of earthquake action components; 2 selecting n kinds of input seismic wave, applying them on a whole analysis finite element model one by one, carrying out nonlinear time-history analysis of seismic response, and analyze that response of a reinforced concrete beambridge structure under different seismic intensity working conditions; S3 calculating the residual energy ratio in each earthquake intensity working condition, comparing the residual energy ratio witha residual energy ratio limit value, if the calculated residual energy ratio is smaller than the residual energy ratio limit value, judging that the reinforced concrete beam bridge structure enters the collapse stage, otherwise, judging that the reinforced concrete beam bridge structure does not collapse. The method of the invention can overcome the shortcomings of the prior component-based collapse criterion, and provides a method for judging the seismic collapse of a reinforced concrete beam bridge at the structural level based on the energy balance principle.

Description

technical field [0001] The invention relates to the field of anti-collapse analysis of bridge structures in the field of civil engineering, in particular to an energy balance-based earthquake collapse judgment method for reinforced concrete girder bridges. Background technique [0002] Reinforced concrete girder bridges are the main bridge type of small and medium bridges in my country. This type of bridge has suffered earthquake damage in many earthquakes, and even the bridge collapsed in severe cases. The famous one is the Miaoziping Bridge in the Wenchuan Earthquake, which is simply supported T Beam (continuous bridge deck), in the Wenchuan earthquake, the third simply supported beam with one hole fell into the water along the longitudinal direction of the bridge. [0003] In the current research and engineering practice of seismic performance-based design, collapse-resistant design is a unique field, not only because it is of great significance - "not to collapse after a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23G06F30/13
Inventor 黎雅乐宗周红杨丙文
Owner JIANGSU OPEN UNIV
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