带桩基底板混凝土模型简化及开裂风险影响因素的数值模拟分析  

Simplification of Concrete Model with Pile Foundation Bottom Slab and Numerical Simulation Analysis of Factors Affecting Cracking Risk

作　　者：卢存 肖志勇 徐文[2] 李明 郭景莘 王瑞 LU Cun;XIAO Zhiyong;XU Wen;LI Ming;GUO Jingxin;WANG Rui(State Key Laboratory of High Performance Civil Engineering Materials,Jiangsu Sobute New Materials Co.,Ltd.;College of Materials Science and Engineering,Southeast University;China Huashi Enterprises Co.,Ltd.)

机构地区：[1]江苏苏博特新材料股份有限公司高性能土木工程材料国家重点实验室 [2]东南大学材料科学与工程学院 [3]中国华西企业股份有限公司

出　　处：《广东建材》2025年第2期21-25,共5页Guangdong Building Materials

摘　　要：在含混凝土桩基的底板大体积混凝土的温度及应力仿真计算中,利用等效体积法对含桩基的底板混凝土的力学及热学参数进行了简化,结果表明等效地基模型与实际建桩模型相比,其不同特征点处开裂风险计算结果较为严格,可为实际结果提供参考。在等效地基模型中考虑了入模温度、浇筑长度对开裂风险的影响,结果发现,在一定范围内,浇筑长度对开裂风险的影响大于入模温度,同时,加入膨胀剂能有效降低底板的开裂风险。有边侧先浇底板的约束下,开裂风险最大点向约束处靠近,为控制开裂风险在安全阈值0.7以内,应适当减少约束侧的最大一次浇筑长度。In the simulation calculation of temperature and stress in the mass concrete of the bottom slab containing concrete pile foundation,the mechanical and thermal parameters of the concrete model of the bottom slab containing pile foundation were simplified by using the equivalent volume method,and the results show that the equivalent foundation model has a more rigorous calculation of the risk of cracking at different characteristic points compared with the actual pile construction model,which can provide a reference for the actual results.The effects of entry temperature and casting length on the risk of cracking were considered in the equivalent foundation model,and it was found that the effect of casting length on the risk of cracking was greater than that of entry temperature within a certain range,while the addition of expansion agent could effectively reduce the risk of cracking in the base slab.With the constraint of side first pouring bottom slab,the maximum point of cracking risk is close to the constraint,and in order to control the cracking risk within the safety threshold of 0.7,the maximum primary pouring length of the constraint side should be reduced appropriately.

关 键 词：等效模型 桩基底板混凝土 开裂风险 仿真计算 

分 类 号：TU37[建筑科学—结构工程]