混凝土框架约束横孔连锁砌块干砌墙体抗震性能试验研究

Seismic behavior on cross bore chain block dry walls confined concrete frame

通过对4片足尺混凝土框架约束横孔连锁砌块干砌墙体,在恒定竖向荷载和水平低周反复荷载作用下进行的抗震性能试验,研究了混凝土框架约束横孔连锁砌块干砌墙体的破坏机理、承载能力、变形能力、延性、滞回特性和刚度退化等,分析了不同构造措施以及窗洞、高宽比对墙体抗震性能的影响。试验结果表明:水平钢筋混凝土带能有效地提高墙体的承载能力和抗震能力,增强变形能力和延性;窗洞对墙体的开裂荷载、极限荷载以及刚度都有较大削弱,建议采用设置混凝土构造柱与水平带来提高开洞墙体的抗震性能;墙体高宽比过大不利于墙体的抗震;混凝土框架约束横孔连锁砌块干砌墙体具有良好的承载能力、变形能力和抗震性能。

Seismic behaviors of 4 pieces of full scale cross bore chain block dry walls confined concrete frame were experimentally studied under constant vertical and low reversed cyclic lateral loading.Emphasis was put on the understanding of the failure mechanism,bearing capacity,deformability,ductility,hysteresis characteristic and stiffness degradation of the wall under seismic loads.And the effects of constructional measures,window opening and height-width ratio on the seismic behavior of walls were also investigated.The test results indicate that horizontal reinforced concrete belts can improve the seismic behavior,enhance the deformation capacity and ductility of the walls.The window opening reduces the initial cracking load,the ultimate load and stiffness of the walls.It is suggested that the earthquake-resistance capacity of the window opening can be improved if bordered by tie columns and horizontal reinforced concrete belts.Overlarge height-width ratio is harmful to the earthquake-resistance of the walls.Cross bore chain block dry walls confined concrete frame have good bearing capacity,deformability and seismic behaviors.