考虑温度与时变因素耦合的混凝土桥梁增量分析方法

发布时间：2018-10-29 22:28

【摘要】：为了准确掌握在材料时变特性因素(如混凝土弹性模量、收缩徐变、预应力钢筋松弛等)与温度变化耦合作用下混凝土桥梁施工期及运营期结构效应变化历史,基于时间序列划分,采用增量形式的虚功平衡方程,推导考虑温度变化与材料时变因素耦合的有限元求解方程;结合具体时变函数表达,建立考虑温度耦合作用时混凝土时变弹性模量修正公式及时间增量步内一维梁单元计入时变因素影响的杆端荷载项表达式。结合实际工程,采用所提出的计算方法进行编程计算,将考虑温度耦合作用的计算结果与不考虑温度耦合作用的计算结果及实测结果进行对比分析。研究结果表明:考虑温度耦合作用的长期挠度计算结果与实测结果更接近,说明考虑温度与时变特性耦合效应的增量分析计算方法能有效提高混凝土桥梁计算分析的准确性和可靠性。
[Abstract]:In order to accurately grasp the history of structural effects of concrete bridges during construction and operation under the coupling of temperature and elastic modulus of concrete, shrinkage and creep of concrete, relaxation of prestressed steel bar, etc. Based on the time series division, the finite element equation considering the coupling of temperature variation and material time-varying factor is derived by using the incremental virtual power balance equation. Based on the expression of concrete time-varying function, the modified formula of time-varying elastic modulus of concrete considering temperature coupling and the expression of load term at the end of the rod considering the time-varying factors of one-dimensional beam element in time increment step are established. Combined with the actual engineering, the proposed calculation method is used to carry out the programming calculation. The calculation results considering the temperature coupling are compared with the calculated results and the measured results without the consideration of the temperature coupling. The results show that the calculated results of long-term deflection considering temperature coupling are closer to the measured results. It is shown that the calculation method of incremental analysis considering the coupling effect of temperature and time-varying characteristics can effectively improve the accuracy and reliability of the calculation and analysis of concrete bridges.
【作者单位】：长沙理工大学土木与建筑学院;湖南省交通规划勘察设计院有限公司;
【基金】：国家自然科学基金资助项目(51178059)~~
【分类号】：U441

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