简支转连续桥梁徐变效应通用计算方法研究

Research on computational method of creep internal force of simple-continuous bridge based on classical mechanics theory

简支转连续桥梁的施工阶段可划分为简支梁阶段、体系转换阶段以及成桥阶段,由于徐变的影响,结构将产生内力重分布现象,并随着跨径、一联孔数以及每个施工阶段的持续时间而改变。目前,有限元方法几乎成为简支转连续梁桥设计计算的唯一手段。针对简支转连续体系特点,基于经典结构力学分析结论,推导得出针对体系特点的简支转连续梁桥混凝土徐变内力效应简化通用计算公式。

The construction stages of simple-continuous bridge consist of simply supported stage, system conversion stage and completion stage. Due to the creep, the structure will produce internal force redistribution, which is influenced by span length, span quantities and time at different stage. Presently, the finite-element method is nearly the only way to solve it. Aiming at the system characteristics of simple- continuous bridge, and based on classical mechanics computation theory, this paper deduces the universal calculation equation of creep internal force of simple-continuous bridge.