Studies on Two-Story Two-Span HPC Frames under Low Reversed Cyclic Loading

摘要

Based on tests of two pieces of two-story two-span high performance concrete frames (one is nonprestressed frame and the other is prestressed frame) under low reversed cyclic loading, failure pattern, failure mechanism, hysteresis curves, restoring-force model, displacement-restoring capacity, displacement ductility, stiffness degradation and energy dissipation are systematically investigated. Experimental studies show that both failure patterns of the two frames are partial beam sideway mechanism; both frames present better seismic performance and high displacement ductility. Ductility of nonprestressed frame is much higher than that of prestressed frame. In addition, a nonlinear FEM program, on basis of restoring-force model, for hysteresis full-range analysis of multi-story and multi-span HPC frames, is developed. Calculations by using this program are in good agreement with the test results.