异形高强大体积混凝土施工温控研究

Research on temperature control of special-shaped and high strength mass concrete in construction

摘要

基于跨铁路高架桥V形刚构墩结构施工，研究高强异形大体积混凝土的温度控制措施。分别建立了墩座、斜腿第一节段和斜腿第二节段的有限元模型，分析了不同降温措施下混凝土的温度峰值随龄期的变化特征和内部温度场特征，比较了温度监测和模拟结果。结果表明：不同施工段的温控关键参数不同，墩座为温度峰值，斜腿为最大表里温差。高强大体积混凝土的抗裂性能提高，温度峰值和最大表里温差可比现有规范提高5℃,表面与大气温差值可提高10℃。

Abstract

Based on the construction of V-shaped rigid pier of cross-railway viaduct, the temperature control measures of high-strength special-shaped mass concrete were studied. The finite element models of the pier and the two sections of the inclined leg were established respectively. The characteristics of the temperature peak with age and the internal temperature field under different cooling measures were analyzed. The result of temperature monitoring and simulation were compared. The result show that the key parameters of temperature control are different in different sections. The peak temperature of the pier is the maximum temperature difference between the surface and the inside of the inclined leg, which is the peak temperature for pier and the maximum temperature difference between surface and inside for inclined leg. The crack resistance of high strength mass concrete is improved, the peak temperature and the maximum temperature difference between the surface and the inside are increased by 5 ℃ compared with the existing specifications, and the temperature difference between the surface and the atmosphere can be increased by 10 ℃.

关键词

V形刚构墩 / 大体积混凝土 / 温度场 / 现场监测

Key words

V-shaped rigid frame pier / mass concrete / temperature field / in-situ monitoring

基金资助

国家重点研发计划项目(SQ2021YFB2600031)

国家自然科学基金项目(5197090040)

南京工业大学浦江学院校级课题(njpj2023-1-11)