Seismic Performance And Fragility Curves Of Double-limb-thin-wall Bridge Pier With Several Different Typical Energy Dissipating Coupling Beams

The double-thin wall bridge pier has good carrying capacity and construction convenience,and is often applied to high-pier continuous rigid bridges.Swinging forms can reduce the impact of earthquake effects and meet structural delay design needs,which can reduce structural damage.In the structure of the double-thin wall swing bridge pier,its framework effect can be fully utilized,and the energy-consuming beams that are easy to replace can effectively improve the structural damping the structure of the earthquake sacrifice component,thereby reducing the damage of the main structure.For this structure,from the perspective of damage concentration and decentralized energy consumption,three different forms of replaceable energy consumption beams are designed.However,the shock resistance performance of different forms of beams and contributions to the main structure are not the same.In order to compare the seismic resistance of the three replaceable beams,based on the structure of double-thin wall swinging bridge pier structure,analyzing the evolution process and energy consumption ability of the structure through the integrated static test and numerical simulation of the structure,it can provide reference for related research and engineering applications.Essence The main research content includes the following aspects:(1)Based on the research of previous scholars’ replaceable beams,the three different forms of energy-consuming beams that were simple,low-cost,and easy to replace after earthquakes were cited in the double-thin wall swing bridge pier.And through the aspiration of the destructive form,energy consumption characteristics,repair time and limit of the three different forms of energy beams through the intended static test.The test results show that the repair time of the three beams is 1.02 h,and at the same time,the residual turning corner is used as the indicator to obtain the restoration limit of the linked beam to 0.008 RAD,which shows that the three beams can meet the replaceable requirements and improve the recovery ability of the structure of the structure.(2)The test data is organized to draw quantitative indicators such as stagnation curve,energy consumption capacity curve,and skeleton curve.The above-mentioned performance indicators are analyzed and evaluated the performance of the three beams based on the performance of the three beams.At the same time,the effects of different energy consumption beams on the anti-seismic performance of double-thin wall pillars are analyzed.As a result,the energy consumption beam can effectively disperse the energy of the earthquake,which can ensure the safety of the main structure and improve the capacity of the pier column.(3)In the comparison of the performance of the three different forms of energy consumption beams,it was found that under the same situation of the design and carving capacity of the beam,the energy consumption capacity of the anti-energy section of the cut-type beam is 6.4 times that of the friction-type beams.It is 1.8 times that of the bending energy beam section.The extreme bearing capacity of the cutting type beam under the same layer interval beam is 3.2 times that of the friction type is1.8 times the curved type.This shows that the limit bearing capacity and energy consumption capacity of shear beams are higher than bending and friction,which is more conducive to improving the seismic performance of the main structure and can provide reference for actual engineering applications.(4)Establish a numerical model with different energy-consuming beams with different energy-consuming beams.And analyze and simulate the pinch effect in the stagnation curve,and finally verify the finite element model through the test data result,so as to obtain a modeling method suitable for double-thin wall swing pier pillars with different energy-consuming beams,for it,for it,for the Related beams provide reference and ensure the smooth progress of subsequent vulnerable analysis.(5)The use of vulnerable analysis methods are used to evaluate damage to the dual-thin wall swing pier columns with different energy consumption beams.It is found by the comparison of the three structures that surpass the probability under different damage levels,and consume energy beams under the action of earthquakes can give priority to energy consumption and reduce the probability of the limited state of the main structure.At the same time,the probability of severe damage to the shear type and bending type is the 0.67 and 0.80 of the friction type,which can determine that the effects of shear beams and curved beams have better effects in reducing the effects of earthquakes and protecting the safety of the structure of the structure.Can provide reference for subsequent research and engineering applications.