Collision Analysis of Transverse Stops Considering the Vertical Separation of the Main Beam and Bent Cap

An, Wenjun; Zhang, Lin; Fang, Ting; Wu, Yiren; Li, Qi

doi:10.3390/su15032809

Cited by 1 publication

(3 citation statements)

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“…Among them, the growth rate of the maximum bending moment at the bottom of the pier under the action of condition D and condition C is 61.9% and 28.6%, respectively, and the ratio of the two is 2. 16. It shows that the amplification effect of lateral collision on the maximum bending moment of the pier bottom becomes more and more prominent with the increase in fault slip displacement.…”

Section: Degree Of Fault Dislocationmentioning

confidence: 92%

“…In order to prevent the occurrence of falling beams or to ensure the seismic safety of bearings, the measures of placing shear keys in the transverse direction of the bridge are usually adopted in bridge engineering [13,14]. Although the shear key can reduce the seismic damage of the falling beam [15], it will also collide with the main beam, causing component damage [16]. Therefore, transverse shear key damage is a very common form of damage in post-earthquake bridge structures.…”

Section: Introductionmentioning

confidence: 99%

“…For example, in the 1999 Chi-Chi earthquake and the 2001 Gujarat earthquake, there are many records of lateral movement and shear key failure of bridge superstructures [9,17]. In the 2008 Wenchuan earthquake, the beam bridge damage was extremely severe, and the shear key failure rate was as high as 16.8%, while the pier failure rate was only 2.4% [18]. For the overall seismic design of the bridge, the main function of the transverse shear key is to limit the displacement and transfer force.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the Effect of Lateral Collision on the Seismic Response of Bridges under Fault Misalignment

Fan,

Hui,

Liu

et al. 2023

Applied Sciences

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Mutual dislocation of seismogenic faults during strong earthquakes will result in a large relative displacement on both sides of the fault. It is of great significance to explore the influence of the collision effect between the main beam and the transverse shear key on the seismic response of the bridge under fault dislocation. In this paper, a series of cross-fault ground motions with different ground permanent displacements are artificially synthesized using a hybrid simulation method. Based on the contact element theory, the Kelvin–Voigt model is used to simulate the lateral collision effect. The effect of lateral collision on the seismic response of the continuous girder bridge is compared from the two aspects of fault dislocation position and fault dislocation degree. On this basis, the analysis of lateral collision parameters is carried out with the aim of reasonably regulating the seismic response of the structure. The results show that, compared with the near-fault bridge, the influence of lateral collision on the cross-fault bridge is stronger. The amplification of the bending moment of the central pier and the limitation of the bearing displacement are five times and two times, respectively, for the near-fault bridge. When the fault has a large dislocation, the weak point of the structural damage is the bending failure of the pier bottom and the residual torsion after the earthquake. The collision parameters of conventional bridges will aggravate the bending moment demand of the pier bottom of cross-fault bridges and limit their bearing displacement too much. Therefore, by appropriately reducing the collision stiffness and increasing the initial gap, the internal force and displacement response distribution of the cross-fault bridge structure can be more reasonable. The study in this paper has reference significance for seismic analysis of cross-fault bridges with transverse shear keys.

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Section: Degree Of Fault Dislocationmentioning

confidence: 92%