8度区异形柱框架结构的振动台试验研究

Shaking table test of RC frame with special-shaped columns designed for seismic fortification intensity 8 zone

为深入研究异形柱框架结构的抗震性能,探讨其在高烈度地震区的适用性,以8度区Ⅲ类场地为背景,综合考虑实际工程情况和模型试验的可行性等因素,设计了一个6层的异形柱框架结构为原型。按照加速度相似系数等于1和"用人工质量模拟的弹塑性模型"的要求,采用微粒混凝土制作了1/6比例的试验模型,进行了振动台试验,研究了设计计算方法的适用性、结构的总体抗震性能和破坏机制。根据设计计算的结果、试验中观察到的现象以及对试验结果的分析,在指出该种体系具有易于满足位移要求、在大震中以梁铰机制为主等优点的同时,也指出了其在高烈度区应用的重点问题是节点承载力。

In order to further investigate the seismic performance and suitability of RC specially shaped columns structure in high intensity zones,a six-storey RC frame with specially shaped columns in seismic fortification intensity 8 zone and type 3 site was designed as the prototype for shaking table test.According to the requirement of acceleration similitude factor equal to 1 and elasto-plastic properties simulated by artificial mass,a 1/6 scale testing model is constructed by micro aggregate concrete.The shaking table test puts emphasis on the applicability of computational model,the global seismic performance and damage mechanism of structure.Numerical results of structural design and experimental observation reveal the advantages of this structure system,that is the easy attainment for drift control requirement and predomination of beam hinge mechanism under major shock.Above all,more attention has to be paid to joint capacity for its application in high intensity zones.