粘结型锚栓群锚弯剪受力计算方法与设计建议  

Design Method and Proposals of Adhesive Anchors Group Under Combinations of Moment and Shear Loading

作　　者：谢群[1,2] 王欣[2] 鞠好学[3] 

机构地区：[1]济南大学土木建筑学院,济南250022 [2]山东建筑大学山东省建筑结构鉴定加固与改造重点实验室,济南250101 [3]山东商业职业技术学院,济南250103

出　　处：《土木建筑与环境工程》2013年第S1期121-124,共4页Journal of Civil,Architectural & Environment Engineering

基　　金：山东省建筑结构鉴定加固与改造重点实验室开放课题(JG01)

摘　　要：粘结型锚栓是土木工程领域应用广泛的后锚固连接件,其具有代表性的使用情况为多个锚栓处于弯剪复合受力状态。在对比分析当前理论成果基础上,设计时可采用椭圆型拉剪计算公式并假定所有锚栓均参与受剪,将群锚弯剪受力问题转化为受拉最大那排锚栓的拉剪承载力计算。为保证连接安全并充分发挥锚栓强度,后锚固连接应控制为锚栓钢材破坏。为实现该目标,设计时可将剪跨比作为控制参数,通过公式推导和研究数据分析,在满足相关锚固要求前提下,当剪跨比大于0.6时可初步判断为锚栓钢材破坏,最后给出了后锚固群锚连接的设计建议和构造措施,以供工程应用参考。Adhesive anchors are widely used as post-installed fasteners in civil engineering.A typical steel-to-concrete connection includes multiple anchors which are commonly subjected to combined moment and shear loading.Based on the assumption that all anchors take up shear load,a revised method is developed for the design of ductile anchors,which considers that only the row of most stressed anchors in the tension zone are needed to meet the elliptical interaction of tension and shear capacity requirement during the design process of anchorage group under combined shear and moment loading.The ultimate strength of post-installed fastenings should be controlled by the strength of anchor steel for the purpose of connection safety and full utilization of anchor capacity.For the objective of ductile design in anchor group,the ratio of shear span could be used as an evaluation parameter in the process of strength prediction.According to the theoretical analysis and results comparison,the ductile failure of anchor steel in post-installed fastenings can be guaranteed when the ratio of shear span is greater than 0.6 and other anchorage requirement is met.In the end,design proposals and construction specification of anchor group are given for practice.

关 键 词：后锚固 弯剪受力 群锚 剪跨比 构造措施 

分 类 号：TU375[建筑科学—结构工程]