简支桥跨剪力、主拉应力横向分布模型实验及电算分析

MODEL TEST AND PROGRAMMING ANALYSIS OF SHEAR FORCE AND PRINCIPAL TENSILE STRESS OF SIMPLE SUPPORTED BRIDGE STRUCTURE

剪力和主拉应力计算,是钢筋混凝土和预应力钢筋混凝土简支梁桥设计计算的重要内容之一,剪力有时直接控制主梁截面尺寸及箍筋设计。本文通过五梁式简支T梁桥钢模型实验和电算分析,得出简支桥跨结构各截面剪力、主拉应力、弯矩横向分布系数皆为弹性分布,且剪力分布峰值由L/4截面分别向h截面和跨中截面递增,弯矩分布峰值由跨中截面向h截面递增。

The calculation of the shear force and principal tensile stress is one of the very important parts in designing and calculating reinforced concrete and prestressing reinforced concrete simply supported bridge. Sometimes, shear force directly controls the design of dimension and steel hoop of girder. In this paper,steel model test of T-section simply supported bridge with five beams and programming analysis are applied which shows the shear force, principal tensile stress and bending moment lateral distribution coefficient in each Section of simply supported bridge structure is elastic distribution. The peak of shear increases gradually from the section in one-fourth of span to the section h and to the midspan, the peak of bending moment increases gradually from the midspan to the section h.