再生混凝土框架抗震性能的试验研究

An experimental study on the seismic behavior of recycled concrete frames

在保持竖向荷载恒定的情况下,对3榀再生骨料掺量为30%、50%和100%的再生混凝土框架和1榀天然混凝土框架进行了水平低周反复荷载试验,研究了再生混凝土框架的破坏机制、承载力、滞回特性、延性、强度退化、刚度退化和耗能等性能,并和普通混凝土框架进行对比分析。试验发现再生混凝土框架为“强柱弱梁”的破坏类型,最大水平承载能力比普通混凝土框架低2.3%～15.7%,位移延性系数在3.91￣4.54之间,和天然混凝土框架相比耗能能力没有明显降低。试验结果表明再生混凝土框架具有良好的抗震性能,应用于工程实际是完全可行的。

Experiments of three recycled aggregate concrete frames （composed of 30%,50%,100% recycled aggregate） and one conventional concrete frame, as the reference basis, under low-cyclic horizontal and constant vertical loads were performed. The seismic behavior of recycled concrete frames, such as the failure patterns, hysteresis loop, displacement ductility, deterioration of stiffness and energy dissipation, etc., was studied and a comparison of such behavior was made with that of the reference concrete frame. The test results indicate that concrete frames using recycled aggregates show improved seismic performance, as evidenced by a failure pattern of ＂ strong column and weak beam＂ and a displacement ductility factor of 3.91～4.54. Further, its maximum horizontal bearing capacity is lowed by 2.3%～15.7% than that of the reference frame. On the other hand, no clear indication on the energy dissipation capability is shown. This study concludes that the use of recycled aggregate concrete frames for civil engineering structures is quite feasible.