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收缩徐变对装配式混凝土叠合梁挠度的影响
唐迪未1, 金伟良1, 毛江鸿2, 赵羽习1, 方言1
1.浙江大学 建筑工程学院, 杭州 310012;2.浙江大学宁波理工学院, 浙江 宁波 315100
摘要:
收缩徐变作用导致混凝土叠合梁挠度增加,从而影响构件的力学性能。为了研究收缩徐变作用下混凝土叠合梁挠度增加规律,建立了收缩徐变作用下混凝土叠合梁挠度计算方法,与数值模拟进行比较,结果相近。运用该方法对混凝土叠合梁的加载龄期、应力水平进行敏感性分析,结果表明:应力水平不同时,混凝土叠合梁挠度随加载龄期呈现不同变化趋势,应力水平较低时,挠度随加载龄期增大而增大,反之,挠度随加载龄期增大而减小;混凝土叠合梁叠合面处的徐变微差相对收缩微差较小,叠合面处预制和现浇混凝土变形不一致引起的挠度主要由收缩不一致引起。
关键词:  装配式叠合梁  收缩徐变  挠度  数值模拟  敏感性分析
DOI:10.11835/j.issn.2096-6717.2019.127
分类号:TU375.1
基金项目:国家重点研发计划(2016YFC0701400);国家自然科学基金(51820105012);宁波市自然科学基金(2017A310313)
Influence of shrinkage and creep on deflections of assembled concrete composite beams
Tang Diwei1, Jin Weiliang1, Mao Jianghong2, Zhao Yuxi1, Fang Yan1
1.College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310012, P. R. China;2.Zhejiang University Ningbo Institute of Technology, Ningbo 315100, Zhejiang, P. R. China
Abstract:
Shrinkage and creep may increase the deflection of concrete composite beams and therefore affect the mechanical properties of components. In order to investigate the increase pattern of the deflection of concrete composite beams under action of shrinkage and creep, a calculation method for the deflection of concrete composite beams induced by shrinkage and creep was established. The comparison between the proposed method and numerical simulation indicates that the results obtained by the two methods are consistent. Based on this method, the sensitivity of loading age and stress level of concrete composite beams was analyzed. The results show that the deflection of concrete composite beams varies with the loading age when the stress level is different. When the stress level is low, the deflection increases with the loading age, whereas the deflection declines with the rising of loading age. Differential creep at the overlap surface of concrete composite beams is much smaller than the differential shrinkage, and the deflection caused by the difference of the precast concrete and cast-in-place concrete at the overlap surface is mainly caused by difference of shrinkage.
Key words:  assembled composite beams  shrinkage and creep  deflection  numerical simulation  sensitivity analysis
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