受剪状态下化学锚栓群锚系统承载力

为了研究化学植筋式后锚固群锚系统抗剪承载力的影响因素,通过4组化学锚栓群锚系统受剪破坏性试验,研究在不同边距、不同间距下系统抗剪承载力情况.通过观察试件的破坏形式、测试破坏荷载以及有限元分析,结果表明:边距大小影响化学锚栓群锚系统破坏形式和锚栓位移,边距小会发生脆性破坏而边距大则发生延性破坏;植筋间距大小会影响群锚系统锚栓之间相互作用.间距小时,同一排锚栓产生的应力相互影响,裂缝会向锚栓深度方向上扩展,间距大时同一排锚栓的产生应力相互独立,开裂后混凝土形成两个独立楔形体.通过对比规范计算结果、有限元分析结果和试验结果,验证了现行规范关于抗剪承载力设计的可靠性.

Chemical anchor bolt anchorage group subjected to shearing strength

A total of four specimens have been tested with different edge distances and spacings in order to study the failure of chemical anchor bolt anchorage group subjected to shearing strength.The influence of different edge distances and spacings on the failure form,shearing strength and ultimate displacement is taken into account by the whole variety test of failure load and the results of finite element.The results indicate that the edge distance has impact on the failure form and displacement of chemical anchor bolt anchorage group under load.Brittle fracture may occur under the condition of small edge distance while ductile fracture may occur under the condition of large edge distance.In addition,the spacing has impact on the interaction of chemical anchor bolts.The test indicates that the stress generated by the interaction of anchors with small spacing will result in the propagation of crack along the depth of anchor.When the stress generated with the row of anchor bolts is independent of each other under the condition of large spacing,cracks form two separate concrete wedges.Comparison of the test data with finite element analysis result shows that the equation provided by the related code is reliable in shearing strength.