Abstract

Info

Title:: Experiment on New Section Steel Joints for Prefabricated Concrete Frame

Author(s):: CAO Yang; SUN Qian-wei; GONG Wen-jun; WEI Hong-chao; DING Wen-sheng; WANG Guo-lin; China MCC20 Group Corp. Ltd

Keywords:: prefabricated joint; concrete structure; profiled steel connection; quasi-static test

Abstract:: In view of the problems of present prefabricated concrete joints such as complex connection and many wet connections, 3 types (I-type, II-type, combined angel steel) including 6 kinds of prefabricated concrete beam-column joints connected by section steel were designed and quasistatic experiments were carried out. Based on the phenomenon and data of tests, the failure modes and seismic performance of joints were analyzed. The influences of welding connection type, section dimension and section shape on mechanical properties were studied. The results indicate that the influences of prefabricated section steel and longitudinal reinforcement by lap welding or prefabricated board plug welding on properties of joints are little. Compared with the standard cast-in-situ joint, the bearing capacity of the I-type joints is much higher, and the L-type one is similar, the II-type one is slightly lower.All the three kinds of shape steel joints present much better ductility and energy dissipation characteristics, the coefficient of energy dissipation of these joints is twice as high as the standard cast-in-situ joint. The failure modes of the three kinds of joints validate that the design idea is beneficial to improve the seismic performance of the joints through weakening the stiffness of the adjacent area of the joint.