%0 Journal Article
%T 水泥混凝土路面板固化温差对翘曲和应力的影响<br>Effect of built-in temperature difference on curling and stresses in cement concrete slabs
%A 魏亚
%A 梁思明
%A 张倩倩
%J 土木建筑与环境工程
%D 2015
%R 10.11835/j.issn.1674-4764.2015.01.014
%X 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1 d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。<br>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. The 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.
%K 混凝土路面板 固化温差 固化翘曲 终凝时间 有效温度梯度&lt
%K br&gt
%K cement concrete pavement built-in temperature difference built-in curl final set time effective temperature difference
%U http://qks.cqu.edu.cn/cqdxxbcn/ch/reader/view_abstract.aspx?file_no=201501015&flag=1