摘要
为解决钢柱或组合柱与钢筋混凝土梁连接节点构造复杂、施工难度大等问题,提出了2种端部带工字钢接头的预制装配式钢筋混凝土梁,并分别对2种新型梁及1个普通钢筋混凝土对比梁试件进行了受弯性能足尺试验。研究结果表明:在三分点集中荷载作用下,3个试件的变形性能和破坏形态基本一致;2种新型梁的开裂弯矩和极限弯矩与规范计算结果吻合良好,说明可按现行混凝土结构设计规范进行梁体的受弯承载力设计;钢接头和混凝土梁体之间几乎没有滑移,且钢端头在整个加载过程中处于弹性受力状态。基于ABAQUS软件建立了2种新型梁体的有限元分析模型,并通过与试验结果对比验证了模型的正确性。在此基础上研究了采用文中提出梁体的单层框架受弯性能,为梁体的应用提供了基础。
Two innovative precast reinforced concrete beams with steel end connectors at both ends were proposed to reduce the complexities and construction difficulties of traditional connections between steel columns or composite columns and RC beams.Three full-scale specimens including the two innovative beams and one conventional RC beam were tested to obtain their flexural behaviors.The results indicate that the failure mechanism and deformation behavior of the two innovative beams are similar to the conventional one when subjected to a third-point concentrated loading.The cracking moments and ultimate moments obtained from the test agree well with those given in the current concrete code,making it feasible to predict the flexural capacities of the two innovative beams using current concrete code.The slipping between concrete and the two steel joints were measured and the results were small enough to be negligible.The steel joints show an elastic performance all the time until the failure of the beams.Finite element models were developed using ABAQUS to simulate the flexural behaviors of the two innovative beams,and the FE results have a good agreement with the experimental results.Finally,the two innovative beams were respectively cast into a frame model to examine their flexural behaviors in real structures,based on which practical suggestions were proposed for the application of the two innovative precast reinforced concrete beams.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2013年第S1期208-214,共7页
Journal of Building Structures
基金
国家自然科学基金项目(51208148)
中国博士后科学基金项目(2012M520746)
哈尔滨工业大学科研创新基金项目(HIT.NSRIF.2013.114)
"十二五"国家科技支撑计划子课题(2011BAJ09B02-03)
关键词
钢筋混凝土梁
预制装配式
钢接头
静力试验
受弯性能
reinforced concrete beam
assembled monolithic
steel connections
static test
flexural behavior
