| The prefabricated structure has the advantages of short construction period,high product quality and low labor cost,and has significant social and economic benefits.Meanwhile,lightweight ceramsite concrete can effectively reduce the weight of the structure and significantly improve the seismic performance of the structure.This paper first quantitatively studied the anchoring performance of steel bars and lightweight ceramsite concrete through pull-out tests of steel bars and lightweight ceramsite concrete;On this basis,a new type of fabricated concrete beam-column joint was designed,which is suitable for lightweight ceramsite concrete;Finally,based on the finite element analysis,the seismic performance of the new fabricated joint is studied.The study includes the following four aspects:(1)A new type of fabricated concrete beam-column joint,which is suitable for lightweight ceramsite concrete designed.The joint has the advantages of high bearing capacity,superior seismic performance and convenient installation,and can be quickly applied to actual projects.(2)ABAQUS was used to establish the finite element model of the new type of prefabricated ceramsite concrete beam-column joint and the static performance is reasonable and reliable,and its bearing capacity and energy dissipation capacity are significantly improved compared with the cast-in-place joint.The analysis results show that the bearing capacity of the new joint is 35.4% higher than that of the cast-in-place joint,and the energy consumption capacity of the new joint in the late loading period is significantly improved.(3)The finite element model is used to analyze the seismic performance of the new fabricated ordinary concrete beam-column joints,and the influence of key parameters such as the axial compression ratio,the diameter and strength of the steel bars,the strength grade of steel and bolts on the seismic performance on the beam-column joint are studied.The results show that the influence of the diameter of the steel bar on the peak load can reach 22.3%,and the influence of other parameters are all within 10%;the bolt strength grade has a significant influence on the ductility of the joint,and the influence of the ductility coefficient can reach up to 29.6%. |
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