曲线箱梁桥均匀温度变化效应分析

温度荷载的作用是造成曲线箱梁桥工程问题的主要原因之一。文章运用曲线梁桥的微分方程,详细分析了混凝土曲线箱梁在均匀温度荷载作用下的效应,推导出了单跨曲线箱梁在径向受到约束时受均匀温度荷载作用产生的支反力及内力计算公式,并利用公式及有限元软件进行实例计算,验证了公式的准确性,得出了曲线箱梁桥在均匀温度荷载作用下,径向反力的大小与桥梁半径的二次方呈反比例关系,与桥梁的刚度、轴线圆心角呈正比例关系,即桥梁的半径越小,桥梁越宽,圆心角越大,桥梁的径向反力越大的结论,为解决曲线箱梁在均匀温度荷载作用下的工程问题提供理论支持。

Effect analysis of curved box-girder bridges under uniform temperature change

Temperature load is one of the main causes of the engineering problems of curved boxgirder bridge. Effects of concrete curved box girder under uniform temperature loads were analysed in terms of differential equations of curved girder bridge. The reaction force and internal force formula of single-span curved box girder that is bound radially under uniform temperature loading were deduced. Practical calculations were conducted using the deduced formulas and related finite element software to verify the accuracy of the formula. Under uniform temperature loads, the radial reaction force is proportional to the stiffness and radius angle of the box girder bridges, but is inversely proportional to the radius square of the box girder bridges. The radial reaction force of the bridge increases when the bridge radius is small with increasing bridge width and radius angle, which provides theoretical support for solutions to engineering problems of curved box-girder bridge under uniform temperature loads.