Experimental Study and Finite Element Analysis on Seismic Perfor-mance of Fabricated Frames with Mechanical Connections of Rein-forcement

Abstract

In order to study the seismic performance of assembled composite beam-precast column frame structure with steel sleeve extrusion lap connection, the failure mode, deformation capacity and bearing capacity of two 1/2-scale, two-story and two-span assembled frame specimens were studied through quasi-static tests. The test results show that: Both the specimens designed as "strong column and weak beam" and the specimens designed as "strong beam and weak column" achieve the expected failure modes. The horizontal force-displacement hysteretic curve of the specimen is relatively full.  The ultimate interlayer displacement angles of the two specimens are 1/29 and 1/31 respectively, and the ductility coefficient of interlayer displacement is greater than 4.0, which indicates that the specimens have good ductility performance. The sleeve extrusion lap joint can effectively transfer the tensile and compressive forces of steel bars. The finite element analysis program MSC.MARC is used to carry out nonlinear numerical simulation on the assembled frame specimens. The simulation results are in good agreement with the test results. The horizontal force-displacement curves of specimens KJ1 by cast-in-situ frame pushover analysis and by assembled frame pushover analysis are basically consistent. The seismic performance of the assembled concrete frame with steel sleeve extrusion connection meets the requirements of the current code, and the internal force, deformation and bearing capacity can be calculated according to the cast-in-place frame.