桥面铺装快硬混凝土温度应力有限元模拟与试验研究  

Finite element simulation and experimental research on temperature stress of fast hardening concrete for bridge deck paving

作　　者：郭金波 GUO Jinbo(Liaoning Provincial Transportation Planning and Design Institute Co.Ltd.,Shenyang 110116,China)

机构地区：[1]辽宁省交通规划设计院有限责任公司,辽宁沈阳110116

出　　处：《新型建筑材料》2024年第9期125-129,共5页New Building Materials

基　　金：辽宁省交通科技项目(202226)。

摘　　要：通过有限元模拟不同龄期快硬混凝土温度和应力,研究桥面铺装快硬混凝土温度和应力变化规律,并与感测光缆实测结果进行对比分析,验证有限元模拟的正确性。结果表明:各龄期温度开裂指数均大于1.5,快硬混凝土6 h抗拉强度可抵抗水化热产生的拉应力,具有一定抗裂性能;桥面铺装快硬混凝土底层、中间层、表层温度在4 h左右达到峰值,最高温度分别为39、37、32℃,之后各层温度随时间延长而逐渐降低;在0~3 d内,随龄期延长,桥面铺装快硬混凝土中间层、底层的应变逐渐增大,在3 d时应变均达到峰值,7~28 d时应变逐渐减小;有限元模拟计算值与实测值变化规律基本一致,该模型可以为大面积桥面铺装维修用快硬混凝土的防裂及施工工艺优化提供参考。To study the temperature and stress variation laws of fast-hardening concrete for bridge deck paving,finite element simulation was employed to model the temperature and stress changes of fast-hardening concrete at different ages,and the results were compared and analyzed with the measured data from sensing optical cables to verify the accuracy of the finite element simulation.The results indicate that the temperature cracking index for all ages is greater than 1.5,and the tensile strength of fast-hardening concrete at 6 h can resist the tensile stress caused by hydration heat,possessing a certain crack resistance capability.For the fast-hardening concrete in bridge deck paving,the bottom layer,middle layer,and surface layer reach their peak temperatures approximately 4 h after pouring,with the highest temperatures being 39,37,32℃,respectively,after which the temperature in each layer gradually decreases over time.Within the first 0 to 3 d,as the age increases,the strain in the middle and bottom layers of the fast-hardening concrete for bridge deck paving gradually increases,reaching a peak at 3 d,then decreasing by 7 to 28 d.The finite element simulation calculations are basically consistent with the measured values,which can provide a reference for the crack prevention and construction process optimization of fast-hardening concrete in emergency repairs of large scale bridge deck pavement.

关 键 词：快硬混凝土 桥面铺装足尺模型 有限元模拟 温度变化 应力变化 

分 类 号：TU528.31[建筑科学—建筑技术科学]