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摘要
In order to study the seismic behavior of CFDST moment resisting frame, a CFDST moment resisting frame with 3 spans and 10 stories was designed. The hybrid dynamic model was established using OpenSEES. Taking the two-story frame at the bottom of the mid-span as the substructure, the dynamic test study of CFDST moment resisting frame was carried out by hybrid test method. According to the test results, the accuracy of the analysis model was verified. The failure modes and dynamic responses under earthquake were obtained. The mechanical performance of CFDST and composite joint were analyzed. And the seismic behavior of CFDST moment resisting frame was revealed. The results indicate that the main failure modes of the frame include bending of the endplate, local buckling of beam, crack of concrete and bulge of column steel tube. Under the effect of maximum considered earthquake, insignificant damage is found on the whole structure, which indicates that the frame possesses good ductility. Due to the heavy load in the middle of the structure, the middle columns enter yielding stage earlier than side columns. However, the joint can dissipate most of the seismic energy, avoid plastic hinge at the beam end and reduce the bending moment transmitted to the columns through the plastic deformation generated by its own rotation. Furthermore, the mechanical performance of columns and the seismic performance of the CFDST moment resisting frame are improved. ? 2023 Science Press.
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单位中国地震局; 合肥工业大学
