摘要
梁柱采用不同强度混凝土的节点核心区通常采用同柱等强的高强度混凝土浇筑(传统节点),而采用同梁等强的低强度混凝土浇筑(夹心节点)可简化施工过程,但同时降低了节点的抗震性能。为研究碳纤维复合材料(CFRP)加强夹心节点的可行性,通过两组采取加强措施的空间夹心节点试件进行双向等幅低周往复试验研究,对比分析了破坏模式、延性、耗能、变形和承载力等方面的差异。结果表明:CFRP用量不同,对节点核心区的破坏程度有不同影响;CFRP用量越大,加强节点的承载力不一定越高;CFRP用量越小,加强节点的延性与耗能能力越好;在核心区增设碳纤维布需要控制CFRP用量在合适的范围内,才能更好改善夹心节点的抗震性能。
The joint is always casted core area with higher strength concrete of column,which is complex and hard to ensure the quality,while the sandwich beam-column joints casted core area with weaker strength concrete of beam can simplify the construction process,but it reduced the seismic performance of the joint.To study the feasibility of the sandwich joint strengthened with CFRP,two groups of strengthening measures 3D sandwich joint are tested under bi-directional reversed cyclic loads with constant amplitude to investigate the seismic performance,including the failure mode,ductility,energy dissipation,deformation and carrying capacity.The test results show that the different CFRP dosage has different effects on the shear damage degree to the joint core.The greater CFRP dosage does not always go to the higher bearing capacity.The smaller the CFRP dosage,the better the ductility and energy dissipation ability of the joint is received.For the sandwich joint strengthened with CFRP sheet,the CFRP dosage needs to be controlled in appropriate range,it can better improve the seismic performance of sandwich joint.
作者
侯立群
闫维明
Hou Li-qun;Yan Wei-ming(Department of Civil Engineering,Tsinghua University,Beijing 100084,China;Beijing Key Laboratory of Earthquake Engineering and Structural Retrofit,Beijing University of Technology,Beijing 100124,China)
出处
《工程抗震与加固改造》
北大核心
2018年第4期45-52,共8页
Earthquake Resistant Engineering and Retrofitting
基金
国家自然科学基金项目(51378039,51421005)。
