Studies On Energy Dissipation Capacity Of RC Frame Configured With Low Yield Point Steel

The seismic performance such as failure pattern, failure mechanism, hysteresis curves, displacement ductility, rigidity degradation and energy dissipation of the three pieces of RC frame by1/3ratio with double-story and double-span are studied systematically by testing of low reversed cyclic loading. The main factors that affect the ductility of the frameworks were discussed. The bearing capacity and deformation capacity were compared between the RC frameworks configured the low yield point steel and the common RC framework. The influences of the low yield point steel to the seismic performance of frame was studied. And we also established the restoring force model of the low yield point reinforced concrete frame.The results showes that the bearing capacity of the low yield point reinforced concrete frame are the same with the general framework, but the ductility and seismic performance than ordinary reinforced concrete frame.Using ANSYS analyzed the three frameworks numerically. From the load-deformation curves, we compare the calculated and experimental values of ANSYS. The results show that, ANSYS calculated results agree well with the experimental results.By means of the experiment, the main conclusions are:(1) The hysteresis curves tell us that the energy dissipation ability of the frame configured the low yield point was better than the common RC frame. And the energy dissipation ability of the frame configured the low yield point steel and the high toughness concrete was the best.(2) The displacement ductility coefficient of three frames are greater than3.0.The coefficient of the frame configured the low yield point steel and the high toughness concrete and the frame configured the low yield point steel only, respectively, increase by31.7%and15.7%than the general frame, indicating that the use of low yield point steel frame has the better ductility than the average, and high toughness concrete will improve the ductility effectively.(3) It was shown by studied that the level of capacity in the same circumstances, compared with ordinary reinforced concrete frame,the frame configured the low-yield point steel has some good characteristics such as better ductility, higher deformation capacity, slower stiffness degradation, and larger energy dissipation capability. And it shows that seismic performance of the frame configured the low-yield point steel and high toughness concrete is more excellent.