混凝土结构后锚固群锚的抗剪承载力试验  

Experimental Study on the Shear Bearing Capacity of Post-Installed Anchor Group in Concrete Structures

作　　者：项凯[1] 陆洲导[1] 李杰[1] 

机构地区：[1]同济大学结构工程与防灾研究所,上海200092

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第6期985-988,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50578126)

摘　　要：目的研究锚栓边距和间距的变化对混凝土结构后锚固群锚抗剪性能的影响.方法通过后锚固4根锚栓的4个试件，对混凝土结构后锚固的群锚抗剪承载力和群锚试件的破坏模式进行研究，考虑了锚栓边距和锚栓间距对试验结果的影响.结果提出了不同的锚栓边距和锚栓间距对于试件破坏模式和抗剪承载力的判别标准的影响.各试件破坏时，最大位移介于2-8 mm之间，荷载-位移曲线没有明显的流幅，可以认为是脆性破坏.结论锚栓的锚固深度可以认为是混凝土边缘破坏以及锚栓破坏的临界边距，对于锚栓边距较小（〈埋深）的情况，以混凝土边缘破坏时的承载力为标准，锚栓间距对于试验的开裂荷载有影响；对于锚栓边距较大（≥埋深）的情况，以锚栓的破坏为标准.锚栓的荷载-位移曲线没有明显的流幅，为脆性破坏.根据试验结果和有限元分析可知我国现行规范对于后锚固锚栓的抗剪承载力计算较保守.An experimental study was carried out on shear bearing capacity of post-installed anchor group in concrete structure with different anchor edge distance and anchor space length. In order to study the shear bearing capacity and failure mode of post-installed anchor group, four members were designed with different anchor edge distance and anchor space length. Each member has four anchors. For difference anchor edge distance and anchor space length, the failure mode and shear bearing capacity were different. Maximum displacements of anchors were between 2mm and 8mm when members were destroyed. The load-displacement curves of anchors didn＇ t have visible yield plateau, so the failure mode could be regard as brittle failure. The anchor anchoring depths could be regard as critical value for concrete edge failure and anchor failure. When the anchor edge distance was shorter than anchor anchoring depth, the failure mode was concrete edge failure and anchor space length had some influence on cracking load. When anchor space length was longer than anchor anchoring depth, the failure mode was anchor failure. The bad-displacement curve of anchors didn＇ t have visible yield plateau. So the failure mode was brittle failure. According to experimental results and finite element analysis, the code of our country is conservative for shear bearing capacity calculation of post-installed anchor group.

关 键 词：混凝土 后锚固 群锚 抗剪承载力 

分 类 号：TU746.3[建筑科学—建筑技术科学]