摘要
该文针对日照温度梯度模式,按照温度自约束应力的平衡特点,导出了混凝土箱形输水桥的温度应力计算公式。对某输水桥的计算表明:日照作用下混凝土箱形输水桥沿槽身高度方向会产生较大的温差,在非线性温度梯度作用下截面腹板区域将产生较大的拉应力,会降低截面抗裂性,应加强纵向预应力钢筋,提高其抗裂能力;并且,所选取的温度梯度模式不同,在同等条件下所得到的温度应力是不同的。
Base on the sunlight temperature gradient mode and according to the balance characteristic of temperature self-restrict stress,the article educes the temperature stress calculation formula of concrete box water conveying bridge.The calculation of a water conveying bridge shows that the temperature difference will be brought along the trough height of concrete box water conveying bridge under the action of sunlight.The section web part will produce greater tensile stress and reduce the anti-cracking performance of section under the nonlinear temperature gradient action.Therefore,it is to strengthen the longitudinal prestressing reinforcement and to enhance its anti-cracking capability.The temperature stresses are different under the same condition because of the different temperature gradient modes.
出处
《城市道桥与防洪》
2009年第5期175-178,共4页
Urban Roads Bridges & Flood Control
基金
兰州交通大学"青蓝"人才工程基金项目资助(QL-05-13A)
关键词
箱形输水桥
日照温差
温度应力
非线性温度梯度
box water conveying bridge,sunlight temperature difference,nonlinear temperature gradient
