长期荷载作用下再生混凝土梁徐变性能试验  

Experimental study on long-term deformation performance of full-sized recycled reinforced concrete beams

作　　者：曹万林[1] 冯宇 乔崎云[1] 董宏英[1] Cao Wanlin;Feng Yu;Qiao Qiyun;Dong Hongying(Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市与工程安全减灾教育部重点实验室

出　　处：《华中科技大学学报（自然科学版）》2018年第9期127-132,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金重点资助项目(51438007);国家重点研究发展计划资助项目(2017YFC0703304)

摘　　要：为研究再生混凝土足尺梁长期变形规律,共设计制作了6根再生混凝土足尺梁.试验梁经过了750d的长期稳定加载,通过在三分点和跨中分别布置百分表得到梁的挠度变形随时间变化的关系曲线.试验分析了不同骨料取代率对挠度的和徐变系数的影响.还进行了初始挠度分析,比较了中国规范和美国规范初始挠度计算的差异,得到再生细骨料的掺入会使再生混凝土梁刚度大幅降低,初始挠度过大,设计时应予以特别注意.试验对不同骨料取代率下再生混凝土梁挠度、徐变系数进行了非线性拟合分析,结果表明试验值与计算值较为相符,可作为今后再生混凝土梁长期变形计算的参考依据.In order to study the long-term deformation law of the full-size recycled concrete beam,six recycled reinforced concrete full-size beams were designed and manufactured in this experiment.The test beam had been subjected to a long-term stable loading of 750 d.The deflection curve of the beam as a function of time was obtained by arranging the dial gauge in the third and the mid span.The effect of different aggregate replaced ratio on deflection and the influence on creep coefficient were analyzed.In this paper,the initial deflection analysis was also carried out.The difference between the initial deflection calculation of China and that of the United States was compared.The replacement of recycled fine aggregate will reduce the stiffness of recycled concrete beams greatly and the initial deflection is too large.Special attention should be paid to the design.Through the nonlinear fitting analysis of the deflection and creep coefficient of the recycled reinforced concrete beam,the experimental results show that the calculated values are in good agreement with the calculated values and can be used as reference for the future creep calculation of recycled reinforced concrete beams.

关 键 词：再生混凝土 足尺梁试件 长期荷载 挠度计算 试验研究 徐变系数 

分 类 号：TU375.1[建筑科学—结构工程]