Abstract
In order to study the influence of the axial compression ratio and steel ratio on the shear-carrying capacity of steel-truss-reinforced beam-column joints, five shear failure interior joint specimens were designed. The effect of different coaxial pressure ratios (0.1, 0.2, and 0.3) and steel contents on the strain, ultimate bearing capacity, seismic performance, and failure pattern of cross-inclined ventral and chord bars in the joint core area was investigated. The experimental results show that the load-displacement hysteretic curves of all test specimens exhibit a bond-slip phenomenon. With the increase of the axial compression ratio, the ultimate bearing capacity of the joint core increases by 3.4% and 5.9%, respectively. While the ductility decreases by 10.3% and 13.1%, and the energy consumption capacity decreases by 3.2% and 5.8%, respectively. The shear capacity and ductility of the member with cross diagonal ventral steel angle in the joint core are increased by 12.9% and 13.4%, respectively. The shear capacity and ductility of the joint can be significantly improved by increasing the amount of steel in the core area. The expression of shear capacity suitable for this type of joint is obtained by fitting analysis, which can be used as a reference for engineering design.
Highlights
STRC structures can reflect good seismic performance
The influence of axial compression ratio and steel ratio on the ductility and seismic performance of the open-web SRC structure joints were studied through the hysteretic curve and skeleton curve obtained from the tests. is study presents significant experimental results to elucidate the unknown behavior of STRC frame joints
Low-cycle reciprocating load tests were conducted on five specimen joints, and the loading and failure processes were observed. rough the load-displacement hysteresis curves recorded by the actuators, the influences of different parameters on the ductility, energy dissipation capacity, stiffness degradation, and strength degradation of the joints were analyzed
Summary
Force-controlled loading is generally used for specimens with high stiffness and displacement-controlled loading is used for members with strong displacement sensitivity Later, combined with their respective characteristics, the forcedisplacement mixed control method emerged [20]. E loading system adopted in this test is the force-displacement mixed control loading system specified in the specification of testing methods for the testing of earthquake-resistant buildings (JGJ101 96 (SAC, 1996)).
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