组合封闭箍筋混凝土叠合梁受扭性能试验

发布时间：2018-01-31 20:59

本文关键词： 组合封闭箍筋叠合梁纯扭承载力延性裂缝　出处：《哈尔滨工程大学学报》2017年11期 　论文类型：期刊论文

【摘要】：组合封闭箍筋由下部开口箍筋和上部箍筋帽组成,可显著提高混凝土叠合梁的施工效率。为研究组合封闭箍筋对叠合梁受扭性能的影响,本文开展了9根采用4种组合封闭箍筋混凝土叠合梁的单调纯扭试验,对不同构造的组合封闭箍筋混凝土叠合梁的破坏形态、极限承载力、延性及变形能力等进行了系统的研究。结果表明:9根梁的主裂缝均为约45°夹角的螺旋状,最终破坏均为纵筋及箍筋受拉屈服,混凝土压碎;采用组合封闭箍筋叠合梁的受扭承载力与采用封闭箍筋现浇梁基本相同,采用不同组合封闭箍筋的叠合梁的受扭承载力和扭转刚度相近;9根梁的扭转延性系数在9.0~13.2,其中采用形式4组合封闭箍筋(开口箍筋两侧135°弯折、箍筋帽两侧90°弯折)的叠合梁的延性系数高。基于中美规范对上述梁的开裂扭矩和受扭承载力进行计算,规范计算值与试验值吻合较好。
[Abstract]:The combined closed stirrups are composed of the lower open stirrups and the upper stirrups caps, which can significantly improve the construction efficiency of the concrete composite beams. In order to study the effect of the combined closed stirrups on the torsional behavior of the composite beams. In this paper, nine concrete composite beams with four kinds of composite closed stirrups are tested by monotonic pure torsion test. The failure patterns and ultimate bearing capacity of the composite closed stirrups concrete composite beams with different structures are studied. The ductility and deformability of 9 beams are studied systematically. The results show that the main cracks of 9 beams are spiral with an angle of about 45 掳, and the ultimate failure is tensile yield of longitudinal and stirrups, and crushing of concrete. The torsional bearing capacity of composite closed stirrups composite beams is basically the same as that of closed stirrups cast-in-place beams, and the torsional bearing capacity and torsional stiffness of composite beams with different closed stirrups are similar. The torsional ductility coefficient of 9 beams is 9. 0 ~ 13. 2, in which the closed stirrups (135 掳bending on both sides of open stirrups) are combined in form 4. The ductility coefficient of the composite beams with 90 掳bending on both sides of the stirrups cap is high. The cracking torque and torsional bearing capacity of the beams mentioned above are calculated based on the codes of China and the United States, and the calculated values agree well with the experimental values.
【作者单位】：同济大学建筑工程系;
【基金】：上海市科委项目(15DZ1203502) 上海市建委项目(建管2014-001-001) 上海市国资委技术创新和能级提升项目(2015010)
【分类号】：TU375.1
【正文快照】： 网络出版地址:http://www.cnki.net/kcms/detail/23.1390.u.20171016.1607.012.html混凝土叠合梁由预制梁和后浇叠合层组成,是装配整体式混凝土结构中重要的水平构件。传统连续封闭箍筋保证了混凝土叠合梁具有良好的受力性能,但也造成了后浇叠合层中纵向钢筋安装困难、叠合梁

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