Numerical Simulation Method For Seismic Response Of Slotted Prefabricated Bridge Piers And Damage Assessment Studies

The prefabricated assembly technology provides a simpler construction method for bridge engineering construction,and has great potential in my country’s future bridge practice.Slot type prefabricated connection,as one of the connection methods,has the advantages of relatively low construction accuracy,simple construction,and easy control,and has good application prospects.However,its seismic performance needs to be further studied,and the main problems are as follows:(1)There are few specific methods for numerical simulation of slotted prefabricated bridge piers,and there is a lack of numerical simulation methods for reference.(2)At present,the research on the seismic performance of slot-type prefabricated bridge piers at home and abroad is still in its infancy.In order to be applied to areas with multiple earthquakes and strong earthquakes,further research on its seismic performance is needed.(3)Seismic damage assessment methods suitable for slotted prefabricated piers still need to be explored.Solving the above problems can further improve the numerical simulation methods of such piers,master the seismic performance and damage assessment methods of the piers,and promote the practical application of slot-type prefabricated piers.In view of the above research status and its shortcomings,the main goal of this article is to establish a numerical simulation method for slot-type prefabricated bridge piers through comparison with experiments;and further conduct parameter sensitivity analysis of the seismic performance of the bridge piers,and summarize the key parameters for this prefabrication The impact of the seismic performance of the assembled bridge piers;combined with the damage and destruction phenomena of the test,the damage analysis of the slot-type precast assembled piers is carried out,and the appropriate damage assessment method is pointed out.The main research work is as follows:(1)Describe the test process and phenomena of slot prefabricated bridge piers,sort out the displacement-load hysteresis curve in the test,facilitate the comparison of subsequent numerical simulation and test results,and verify the correctness of the numerical simulation method.(2)Establish an accurate numerical simulation method for simulating slot-type prefabricated bridge piers,and use this method to simulate the pseudo-static test of the bridge piers,and then compare the simulation results with the test results to evaluate the reliability of the numerical analysis and the paper The feasibility of the established method provides a basis for the subsequent exploration of the sensitivity analysis of key parameters on the seismic performance of slotted prefabricated piers.(3)Using the numerical simulation method established above,analyze the sensitivity of key parameters(such as axial compression ratio,slenderness ratio and longitudinal reinforcement strength grade)of slot-type precast piers,from hysteresis curve,stiffness degradation and Evaluate its seismic performance in terms of energy consumption and other aspects,evaluate the impact of related parameters on the seismic performance of slot-type precast piers,and provide corresponding references for practical engineering applications.(4)Through investigation and research,7 kinds of damage models suitable for slot prefabricated bridge piers are summarized,and based on the test results,the damage index development curves of the above 7 kinds of damage models are calculated,and the damage phenomenon is further compared and analyzed.The seismic damage assessment method suitable for slotted prefabricated bridge piers is obtained.The results show that,in contrast,Wang Dongsheng’s improved Park-Ang damage model evaluation results are in better agreement with the experimental phenomenon,and can reasonably evaluate the damage degree of this type of bridge pier.