箱形输水桥不同日照温差模式下的温度应力研究

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。

Study of Temperature Stress of Box Water Conveying Bridge in Different Sunlight Temperature Mode

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 performa...