体外预应力粗料石砌体墙抗震性能试验研究  

Experimental research on seismic behavior of rough block stone masonry wall with external prestressing

作　　者：吴涛 陈忠范[2] 高晓鹏 

机构地区：[1]成都世茂新城房地产开发有限公司,四川成都610000 [2]东南大学混凝土及预应力混凝土结构教育部重点实验室,江苏南京210096

出　　处：《建筑结构学报》2017年第12期139-147,共9页Journal of Building Structures

基　　金："十二五"国家科技支撑计划(2011BAJ08B04)

摘　　要：通过7片体外预应力粗料石砌体墙的水平低周反复荷载试验,研究了体外预应力水平、预应力筋布置形式、窗洞口等不同参数对体外预应力粗料石砌体墙的受力过程、破坏形态、受剪承载力、滞回曲线、骨架曲线、变形能力、耗能能力以及刚度退化等的影响。研究结果表明:体外预应力粗料石砌体墙的受力与破坏过程可近似划分为弹性工作阶段、弹塑性工作阶段和摩擦耗能阶段;体外预应力不仅大大提高了墙体的开裂荷载和峰值荷载,同时显著改善墙体的变形能力、延性和耗能能力;墙体开裂荷载和峰值荷载随着预应力水平的提高而增大;墙体滞回性能和耗能能力都随着预应力水平的提高先逐渐增强后逐渐降低,当体外预应力作用为0.3 MPa时达到最大;相比在墙体两端和中间同时布置体外预应力筋,预应力筋全部布置在墙体两端可以提高墙体的开裂荷载,但会降低墙体的峰值荷载,以及其滞回性能、能量耗散系数、刚度退化等抗震性能;开设窗洞口对墙体整体性能和抗震性能削弱明显,在实际结构中应尽量避免开过大的门窗洞口。根据试验及理论分析,提出了体外预应力粗料石砌体墙的受剪承载力计算式。Low cyclic loading tests were carried out on seven specimens with external prestressing to investigate the seismic performance of rough block stone masonry wall,including the loading process,failure mode,shear strength,hysteretic curves,skeleton curves,deformation capacity,energy dissipation capacity,stiffness degradation rule,etc.The main parameters are external prestressing,reinforcement position and window opening. The results show that the failure of the rough stone masonry walls with external prestressing could be divided into three phases,namely elastic stage,elasto-plastic stage and friction energy consuming stage. Prestressing force not only greatly improves the cracking loads and the ultimate loads of the walls,but also improves their behavior of deformation,ductility and energy consumption evidently. The cracking load and ultimate load of the wall increase with the increasing of the external prestressing force. The hysteretic behavior and energy dissipation capacity increase first and then decrease with the increasing of the external prestressing force,and reach the maximum under the effect of external prestressing of0. 3 MPa. Compared with external prestressing reinforcement arranged on both ends of the wall and the middle,arranging all prestressing reinforcement on the ends of the wall can increase the cracking load of the wall,but will reduce the ultimate load and the seismic performance of hysteretic behavior,deformation capacity,energy dissipation capacity. Window opening can weaken wall overall performance and seismic performance very obviously. In the actual structure window opening should be avoided. According to the test and theoretical analysis,the shear strength formula of rough block stone masonry wall with external prestressing is put forward.

关 键 词：粗料石砌体墙 体外预应力 拟静力试验 抗震性能 受剪承载力 

分 类 号：TU363[建筑科学—结构工程] TU317.1