摊铺起始时间对组合箱梁沥青摊铺温度场的影响分析

沥青摊铺是一个短暂的施工过程，所引起的温度场对结构的作用具有时效性，不象日照温度场具有周期重现性，而且温度场在桥梁纵向上也有所变化。本文从温度场计算方法和边界条件的处理着手，结合温度场对结构作用计算原理，探讨沥青摊铺阶段温度应力计算方法：借助各截面上的沙（挠曲变形曲率）来反映次内力作用的大小，将桥梁从纵向上分成若干区段，每个区段内各截面的温度次内力作用相差较小，因而以最大温度次内力作用的温度分布作为该区段的温度分布。通过计算分析得出摊铺时间变化对结构温度场及温度作用的影响规律。

Analysis on the Effect of the Paving Starting Time on the Steel Concrete Composite Box Girder Temperature Field of Asphalt Paving

Asphalt paving is a short course of construction, caused by the effect of temperature field on the structure of time-sensitive, unlike the sunshine temperature field of cycle reproducibility, and the temperature field is also variable in the vertical direction of bridge. Based on the temperature field calculation method and the handling of boundary conditions, combing with the calculation principle of the impact of temperature field on the structure, this article discussed the calculation method of temperature stress during the asphalt paving phase ： using ψ （ deflection of curvature） in the cross section to reflect the role of secondary internal forces size, dividing bridge into several sections in the vertical direction, the small difference among the rote of temperature secondary intetnal forces of every cross section in each section, therefore the temperature distribution caused by the greatest temperature secondary internal forces as the temperature distribution of the section. The effect regulation of the change in paving time on structure temperature field and the role of temperature was obtained by calculation and analysis.