基于无应力状态法的预应力混凝土斜拉桥合理成桥状态加速迭代收敛  

Accelerated Iterative Convergence of Rational Completion State of Prstressed Concrete Cable-Stayed Bridges Based on Unstressed State Control Method

作　　者：张寅涛 白露 Zhang Yintao;Bai Lu(CCCC First Highway Consultants Co.,Ltd.,Xi'an 710075,China)

机构地区：[1]中交第一公路勘察设计研究院有限公司,陕西西安710068

出　　处：《沈阳大学学报（自然科学版）》2018年第6期485-491,共7页Journal of Shenyang University：Natural Science

基　　金：国家自然科学基金资助项目(51308056);国家西部交通建设科技项目(2009319812050);陕西省交通运输厅科技项目(13-25k)

摘　　要：为了快速、准确地确定预应力混凝土斜拉桥合理施工状态,基于混凝土收缩徐变效应对结构的累计影响,通过定义无应力索长修正系数β、索力差值Δ及索力差比λ等参数推导了预应力混凝土斜拉桥在考虑混凝土收缩徐变效应下的无应力状态法加速迭代收敛公式,改进了无应力状态法加速迭代计算流程,并以一座双塔混凝土斜拉桥为工程依托对加速迭代收敛公式和加速迭代计算流程进行了验证.研究结果表明:无应力状态法加速迭代公式和加速迭代计算流程能够有效减少预应力混凝土斜拉桥在确定合理施工状态时的迭代次数和计算工作量,提高计算效率及计算精度,具有很强的工程适用性和可行性.In order to determine the reasonable construction state of prestressed concrete cable stayed bridge more quickly and accurately,the acceleration iteration convergence formula of the stress free state method for PC cable-stayed bridges under consideration of concrete shrinkage and creep was derived,by defining the unstressed length of cable force,modification coefficient difference and contrast parameters of cable force,and the calculation procedure of accelerated iteration without stress state method was improved based on the effect of shrinkage and creep of soil on the cumulative effect of structure.The accelerated iterative convergence formula and the accelerated iterative computation process were verified by taking a twin towers concrete cable-stayed bridge as an example.The results indicate that the proposed unstressed state control accelerated iterative formula and the updated accelerated iterative calculation process,which has strong engineering applicability and feasibility,reduce the number of iterations and improve the calculation efficiency and calculation accuracy in the rational construction state of cable-stayed bridges under the premise of the affection of concrete shrinkage and creep.

关 键 词：预应力混凝土斜拉桥 合理施工状态 无应力状态控制法 收缩徐变 加速迭代 

分 类 号：U442[建筑科学—桥梁与隧道工程]