筋材连接形式对有限空间加筋土挡墙抗震性能影响OA

In order to understand the influence of the reinforcement connection form on the seismic performance of the SMSE wall,shaking table tests are carried out on three reinforcement connection types:non-connection,friction connection and mechanical connection.The evolution laws of acceleration response,panel displacement,dynamic characteristics,reinforcement strain,and potential fracture surface of the three groups of tests are explored.The results show that the acceleration amplification coefficient of the three groups of experiments is nonlinearly distributed along the wall height and reaches the peak value at the top of the retaining wall.The peak values of permanent displacement of the wall are 0.138%,0.034%and 0.015%of the wall height,respectively,the mechanical connection is reduced by 89.13%compared with the non-connection,and the rewinding-type connection is reduced by 75.36%compared with the non-connection.After the test,the natural frequency of the retaining wall decreases,with a decrease of 1.22%,0.81%and 0.52%,respectively.The tensile force increment of the reinforcement increases with the increase of input acceleration amplitude,and changes nonlinearly along the wall height.The measured potential fracture surface form is different from the existing standard fracture surface form,and the mechanical connection potential fracture surface is a double-folded line that passes through the wall toe and stabilizes the steep slope surface along the rear.The comprehensive test data show that the mechanical connection of the reinforcement shows etter seismic performance in terms of permanent displacement and dynamic characteristics of the wall than the rewinding type of reinforcement,but attention should be paid to the reinforcement of the connection behind the wall in the construction design.