四层两跨高性能混凝土框架的抗震性能

Seismic performance of four-story two-bay HPC frame

通过低周反复荷载试验对四层两跨高性能混凝土框架的破坏形态、破坏机制、恢复力模型、变形恢复能力、位移延性、刚度退化以及耗能能力等进行了研究，并对多层多跨框架结构的最优破坏机制进行了分析。研究表明，实现逐层梁铰机制的框架具有良好的整体延性和耗能能力，框架顶点和层间位移延性系数达到4．5～8．0。编制了基于恢复力模型的滞回全过程分析程序，应用该程序对四层两跨高性能混凝土框架进行了模拟计算，计算结果与试验值吻合良好。在此基础上，对高性能混凝土框架结构基于“中震可修”的性能指标及其限值进行了初步探讨。

In order to investigate the seismic behavior of high performance concrete （HPC） frames, such as failure pattern, failure mechanism, hysteretic model, deformation restoring capacity, displacement ductility, stiffness degradation and energy dissipation capacity, an experimental study on a four-story two-bay HPC frame under low reversed cyclic loading is carried out. The optimal failure mechanism of the multi-bay multi-story frame is emphasized. Studies show that a sequential development of beam hinges from bottom to top of multi-story multi-bay frames can provide good ductility and energy dissipation capacity. The top and story ductility coefficients of the frame range from 4.5 to 8.0. A program based on hysteretic models is developed for hysteresis full-range analysis of the model frame. Hysteresis analytical calculations agree well with the experimental results. In addition, structural performance indices and its value of design limits based on the principle of ＂ repairable under moderate level of earthquake＂ for HPC frames are preliminarily studied.