连续曲线箱梁预应力效应分析  

ANALYSIS OF PRESTRESSING EFFECT FOR CURVED CONTINUOUS BOX GIRDERS

作　　者：任茶仙[1] 竺润祥[1] 

机构地区：[1]宁波大学土建系,浙江315211

出　　处：《工程力学》2000年第4期138-142,共5页Engineering Mechanics

基　　金：浙江省自然科学基金!(595090);宁波大学青年基金!(943101GY)

摘　　要：本文通过预应力曲梁微元体的平衡方程，将作用于微元体上的预应力以一组等效荷载来代替。然后根据薄壁曲梁空间翘曲单元的刚度矩阵和各类荷载作用下固端力计算公式［１］，应用矩阵位移法分析曲梁中的预应力效应。计算预应力损失时，考虑了反向摩擦影响。结合某工程实例计算了由预应力引起的结构内力和变形。Based on the differential equations of prestressed curved box girder, a set of the equivalent spatial loads is derived to represent an arbitrary prestress of an infinitesimal element. According to the element stiffness matrix of a spatially curved thin-walled beam and the computational formulas of the fixed-end forces under various loadings, this paper presents the analysis of prestressing effect on a curved continuous bridge by use of the matrix displacement method While calculating prestress losses, the effect of reverse friction is taken into account. An example is provided and the internal forces and deflection ace to prestress on a P.C. curved continuous box girder bridge are calculated it is shown that the method is reliable.

关 键 词：预应力效应 曲线箱梁 等效荷载 反向摩擦 桥梁 

分 类 号：U448.213[建筑科学—桥梁与隧道工程]