摘要
为了研究预应力自密实再生混凝土梁弹性阶段的挠度变化规律,通过12根预应力自密实再生混凝土梁张拉阶段应变和反拱的实测数据,结合现有理论计算方法及规范公式,推导出预应力自密实再生混凝土梁的弹性刚度计算公式,并基于概率论方法,给出弹性刚度折减系数建议值.通过其他3根预应力自密实再生混凝土梁在弹性阶段的试验来验证建议公式的适用性,结果表明,预应力自密实再生混凝土梁弹性阶段挠度实测值较按规范公式计算值大,且与本文建议公式计算值符合较好.
In order to investigate the deflection change rule of prestressed self-compacting recycled concrete beams at the elastic stage,by using the measured strain and anti-arch data of 12 prestressed self-compacting recycled concrete beams and incorporating the existing theoretical methods and normative formulas,the calculation formulas for the elastic stiffness of prestressed self-compacting recycled concrete beams were derived.Based on the probability theory method,the recommended reduction factor value of elastic stiffness was obtained.Through the experiments on other 3 prestressed self-compacting recycled concrete beams at the elastic stage,the applicability of proposed formulas was validated.The results show that the measured deflection of prestressed self-compacting recycled concrete beams is larger than the calculation value obtained with the normative formulas,and agrees well with the calculation value obtained with the proposed formulas.
作者
姚大立
刘云峰
余芳
YAO Da-li;LIU Yun-feng;YU Fang(School of Architecture and Civil Engineering, Shenyang University of Technology, Shenyang 110870, China)
出处
《沈阳工业大学学报》
EI
CAS
北大核心
2020年第3期355-360,共6页
Journal of Shenyang University of Technology
基金
国家自然科学基金项目(51608331)
辽宁省博士启动基金项目(201601170).
关键词
预应力
再生骨料
自密实再生混凝土
弹性刚度
反拱
概率论
折减系数
挠度计算
prestress
recycled aggregate
self-compacting recycled concrete
elastic stiffness
anti-arch
probability theory
reduction factor
deflection calculation
