转体施工开口薄壁拱桥封盘混凝土水化热分析

摘要

The sealing concrete of arch bridge will be constructed after rotation construction of it finished. The concrete has such characteristics like huge size, smaller heat radiating area and more complex boundary constraint. According to the cracking situation of this type bridges in recent years, the paper established hydration heat simulation model of it using MIDAS2010 program and numerical y analyzed for the model. The hydration heat constant coefficients and placing temperature of the concrete hydration heat effect have been analyzed by simulation parameters base on that. And the results showed that it is a important reason causing the cracking of the concrete.%拱桥转体施工结束后,需进行拱脚封盘混凝土施工.拱脚封盘混凝土具有体积大、散热面积小、边界条件约束复杂等特点.针对近年来多座此类桥梁封盘混凝土出现开裂的情况,以一典型桥梁为背景,采用MIDAS2010程序建立其水化热仿真模型,并进行了数值分析.在此基础上,对封盘混凝土的水化热效应进行了水化热常系数、浇筑温度等仿真参数分析.仿真结果表明:水化热效应是造成封盘混凝土开裂的一个重要原因.