Quasi-static Numerical Simulation Analysis Of Seismic Performance Of Self-resetting Energy Dissipation Bridge Piers

The traditional cast-in-place bridge piers generally adopt ductile design methods,which are mainly used as vertical load-bearing and lateral load-resistant components of the whole bridge structure,and play a vital role in ensuring the normal operation of the whole bridge structure.However,after the destruction of the traditional cast-in-place bridge piers,there are often large and unrecoverable residual deformation.In order to solve the problem of the large residual deformation of traditional bridge piers after earthquakes,some researchers in related fields have proposed a new form of self-resetting energy-dissipating piers.This type whole bridge structure of self-resetting energy-dissipating piers uses internal energy-consuming components to consume seismic input energy and depends on settings the pre-stressed steel bars provide self-reset capability and reduce the residual deformation of the bridge piers after earthquakes.Based on the above-mentioned research background,this paper has carried out corresponding research on the seismic performance of self-resetting energy dissipation bridge piers through a combination of theoretical analysis and finite element simulation.The main research contents are as follows:(1)The advantages and disadvantages of traditional cast-in-place piers is analyzed,partially fabricated piers,and self-resetting piers in terms of the construction process convenience,lateral resistance,energy dissipation and other seismic performance,and briefly compared and analyzed the design principles of the above three types of piers.(2)The composition form,design principle and damage state of self-resetting energy dissipation bridge piers is introduced.The mechanical performance analysis is carried out from the two levels of shear resistance and flexural bearing capacity.The calculation formula of the lateral displacement,anti-shearing capacity,and anti-bending capacity is given in self-resetting bridge pier’s yield state and ultimate state,which provides a theoretical basis for performance-based bridge pier design methods.(3)On the premise of keeping the parameter settings of the longitudinal reinforcement and stirrup of the pier consistent,the finite element software is used to model the traditional cast-in-place pier and the self-resetting pier and conducts a pseudo-static analysis.The results show that the hysteresis curve shape of the self-resetting pier is full,and the energy consumption and self-resetting ability are strong.(4)The loading form and evaluation index such as ductility factor of the component model is kept unchanged,and the reinforcement ratio and setting position of the internal energy-dissipating steel bars is successively adjusted to study the influence of changing the above parameters on the seismic performance of the self-resetting bridge pier.The results show that the yield load,ultimate load and energy dissipation capacity of bridge piers increase with the increase of energy dissipation steel reinforcement ratio,while ductility performance will correspondingly decrease;the yield load,ductility performance and energy dissipation capacity of bridge piers is less affected when the setting position of the energy-consuming steel bar is changed,and will not produce much change.(5)The loading form and evaluation index such as ductility factor of the component model is kept unchanged,and the reinforcement ratio and the initial stress applied of the prestressed reinforcement is successively adjusted to study the influence of changing the above parameters on the seismic performance of the self-resetting pier.The results show that the yield load,ultimate load and energy dissipation capacity of bridge piers increase with the increase of the prestressed reinforcement reinforcement ratio,but have little effect on ductility performance;the yield load,ultimate load,energy dissipation capacity and ductility of bridge piers increases with the increase of the initial prestress.