水泥混凝土路面板固化温差对翘曲和应力的影响
Effect of built-in temperature difference on curling and stresses in cement concrete slabs
魏亚 1梁思明 1张倩倩1
作者信息
摘要
实测硬化中水泥混凝土路面板内的温度分布，确定混凝土的终凝时间，提出固化温差及有效温差的计算方法，并计算两种施工环境条件下路面板的固化温差和有效温差，进行固化温差对板的翘曲和应力影响分析计算。研究结果表明：春季和秋季施工在水泥混凝土路面板中产生负的固化温差，将会导致路面板在1d中的大部分时间处于板中脱空的状态，在板中临界荷位处板底产生拉应力，而采用小尺寸板，相比较大尺寸板更能降低路面板翘曲及耦合应力，降低疲劳破坏。
Abstract
The temperature distributions were measured in hardening concrete slabs ,determining final set time of concrete ;the calculation methods of built‐in temperature difference and the effective temperature difference were provided to determine the corresponding values of the slabs constructed during spring and fall ,respectively .Finally ,the influence of built‐in temperature difference on slab curling and stress were evaluated based on finite element analysis .T he results show that negative built‐in temperature differences were found in both spring and fall construction which will lead to loss of slab support in the mid‐slab position during the most time of a day ,and larger tensile stress generates at the slab bottom .However , small size slab will minimize this negative effect from built‐in temperature difference and at the same time reduce fatigue damage .
关键词
混凝土路面板/固化温差/固化翘曲/终凝时间/有效温度梯度Key words
cement concrete pavement/built-in temperature difference/built-in curl/final set time/effective temperature difference引用本文复制引用
基金项目
国家自然科学基金(51108246)
云南省交通厅科技项目(云交科2013A 06)
云南省交通厅科技项目(C 02)
出版年
2015
NETL
NSTL
维普
万方数据