钢桁-混凝土T构组合桥温度效应研究

Steel Truss-Concrete T Rigid Frame Composite Bridge Structure Temperature Study

为了研究混凝土T构温度效应和开裂问题,基于某客运专线黄河铁路特大桥混凝土T构部分,利用有限元计算软件建立桥梁上部结构模型,计算分析在日照影响、极端温度荷载两种荷载工况下钢桁架应力及混凝土应力变化规律。结果表明,温度荷载作为结构设计的控制荷载对超静定结构的影响明显,钢轨和扣件的约束会对桥梁结构温度次内力的大小产生重要影响;在线性温度荷载作用下,钢桁-T构组合结构桥梁的桁架杆件和主梁截面的应力大致呈线性变化;在极端温度荷载作用下,截面最大应力发生在1/4跨处,达到1.26MPa,且V形斜杆总是一端受拉一端受压。

In order to study the effect of temperature and crack of concrete T rigid structure, based on a concrete T rigid structure of the Yellow River railway bridge construction, finite element analysis software is utilized to establish the bridge superstructure model to calculate and analysis the stress change regulation of steel truss and concrete on sunshine effect and extreme temperature load. The result shows that the temperature load has typical influence on the statically indeterminate structure as the control load of structure design ,the constraint form of rail and fasteners ha＇~e important influence on the size of the temperature sub - internal force on bridge structure ; the stress change of truss and main girder section on the steel truss T type rigid structure composite structure bridge is roughly linear under linear temperature load; Under extreme temperature load, the maximum stress which reaches 1.26 MPa, occurs in the position of 1/4 span, and the one end of V shape diagonal truss is always in tension while other end in compression.