单点水平激励下钢管混凝土拱结构抗震设计研究

EXPERIMENTAL STUDY ON SEISMIC DESIGN METHOD OF A CFST ARCH STRUCTURE UNDER SINGLE POINT HORIZONTAL EXCITATION

利用低周往复加载静力试验,基于屈服时各抗震性能指标值的正则化处理方法,研究单点水平往复荷载作用下某平面单层单跨强柱弱拱型钢管混凝土拱结构的抗震性能。试验结果表明:弹性阶段的开裂荷载、滞回环面积、强度、环线刚度及等效粘滞阻尼系数等抗震性能指标可忽略加载方向的影响;屈服后强度、刚度、结构廷性系数及强屈比正向加载值大于反向加载值,按反向加载进行极限状态设计更可靠,但滞回环面积和等效粘滞阻尼系数等耗能指标偏小。

Using low cyclic loading test and normalization method of seismic performance index value, the seismic behavior under single point horizontal excitation of strong column weak arch type plane-single-span concrete filled steel tube （CFST） arch structure have been studied by comparing with a steel reinforced concrete （SRC） column specimen, and the design method of CFST arch structure has been discussed. Research has shown that the performance indexes in the plastic region such as cracking load, hysteresis loop area, strength, stiffness and equivalent viscous damping coefficient can ignore the effects of loading direction. The positive loading value of yield strength, stiffness, ductility coefficient and tensile ratio is larger than that of the nagative loading value, so nagative loading design were more reliable, but energy consumption index which include area of hysteresis loop and the equivalent viscous damping coefficient were smaller.