考虑空间整体效应的温度自应力计算  

Calculation of Thermal Self-restraint Stress by Considering the Global Properties

作　　者：付春雨[1] 李乔[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《铁道学报》2007年第6期80-83,共4页Journal of the China Railway Society

摘　　要：针对在计算混凝土桥梁结构的温度自应力时,按现行的计算方法得到的结果与实测的数据有较大差别的问题,根据温度作用下的应力-应变关系及结构内力特点,并运用三维平面假设,改变温度荷载的加载方式和多余约束力的状态,推导出考虑空间整体效应的温度自应力计算方法。对箱梁的实例分析表明:在计算桥梁结构的温度自约束应力时,应考虑纵横向温度应力-应变之间的互相影响,采用与实际情况相符合的温度荷载加载方式,这样使计算结果更接近实际值。When calculating the thermal stress in a concrete bridge, large differences are found between the resuits calculated by the current method and the data gotten by actual measurement. Based on stress-strain relation and internal force characteristics affected by temperature, the method for calculation of the thermal self-restraint stress is put forward where the global property is considered. During the course, the three-dimensional assumption of plane is used; the mode of thermal loading and restraining force state are changed. An example of a box beam is analyzed. The results show that when the thermal self-restraint stress in a bridge is calculated, the stress-strain interaction between transverse and longitudinal should be considered and the mode of thermal loading should conform to practice. Consequently the calculated result will be closer to the real value.

关 键 词：桥梁工程 温度自约束应力 弹性力学 三维模型 非线性温度荷载 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]