不同轴压比再生混凝土框架节点抗震性能试验研究  

Experimental study on seismic behavior of recycled concrete frame joints with different axial compression ratios

作　　者：刘超[1] 白国良[1] 贾胜伟[1] 尹磊 

机构地区：[1]西安建筑科技大学,陕西西安710055 [2]江苏邮电规划设计院有限责任公司,江苏南京210018

出　　处：《土木工程学报》2013年第6期21-28,共8页China Civil Engineering Journal

基　　金：陕西省教育厅专项基金(2013JK0973);陕西省自然科学基金重点项目(2009JZ012);国家科技支撑计划(2008BAK48B05)

摘　　要：通过对再生粗骨料取代率为0,50%,100%的再生混凝土框架节点进行不同轴压比低周反复荷载下的抗震性能试验研究,对普通混凝土与再生混凝土节点、再生混凝土节点不同取代率之间、不同轴压比情况下的破坏形态、滞回特性、延性性能、耗能特性等问题进行对比分析。试验结果表明:再生混凝土节点破坏过程均经历了初裂、通裂、极限、破坏四个特征阶段;在滞回曲线形态、节点区变形、构件耗能特性方面,再生混凝土节点与普通混凝土节点表现相似,并没有随着取代率变化而发生规律性变化,但从定量对比分析发现再生混凝土构件劣于后者;轴压比的提高可以在一定程度上提高再生混凝土框架节点的抗剪承载力,但同时也增加了节点的脆性,使得延性降低,变形性能差;再生混凝土节点可以应用于有抗震设防要求地区的结构中,但为避免发生节点核心区剪切破坏,建议采用适当轴压比以及增加核心区的配箍,以提高节点核心区的承载力。The low-cycle repeated loading tests were carried out for recycled aggregate concrete joints with recycled replace rate 0, 50% , 100% and different axial compression ratios. The tests were designed to investigate the joint failure modes, hysteretic characteristics, ductility and energy dissipation behavior between the normal concrete joint and recycled aggregate concrete joints with different recycled replace rate. Results show that the mechanical and failure process of recycled concrete frame joints may be composed of four stages ： the initial cracking, the thorough cracking, the ultimate stage and the failure stage. It is found that the recycled concrete frame joints are similar to the normal concrete joint in the hysteretic characteristics, joint deformation and energy dissipation behavior, but the recycled concrete joints are inferior to the latter according to the quantitative comparative analysis. The shear capacity of recycled concrete joints may increase with the axial compression ratio, leading to the increased brittle response, decreased ductility, and poor deformation performance. The recycled concrete joints can be applied to the seismic fortification concrete structures, but it is recommended that the appropriate axial compression ratio and the increased stirrup ratio for core area should be adopted to enhance the shear capacity.

关 键 词：再生混凝土 框架节点 轴压比 剪切变形 抗震性能 

分 类 号：TU375.4[建筑科学—结构工程] TU352.1