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基于拉压杆模型的装配式混凝土挡墙结构设计方法

Design method of prefabricated concrete retaining wall structure based on strut-and-tie model
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摘要 为了研究装配式混凝土箱体挡墙结构在水压力和土压力共同作用下的受力机理,提出了一种基于拉压杆模型的装配式混凝土挡墙结构设计方法.以体积和应变能为优化目标,采用Tosca软件对数值模拟得到的主要受力骨架进行拓扑优化.构建拉压杆模型,结合箱体挡墙结构的破坏机理,分析并推导出侧墙受压、临水面挡墙和集束连接受拉3种主要破坏模式的承载力公式.实际工程对比分析结果表明:进行900次模型优化后,优化形态和应变能基本保持不变;基于拉压杆模型的装配式混凝土箱体挡墙结构的承载能力低于规范值和有限元模拟值,但误差均保持在16%范围内,从而验证了该方法的合理性. A design method for a prefabricated retaining wall structure based on the strut-and-tie model was proposed to investigate the structural force mechanism under the combined influence of water and soil pressures.The main stress skeleton obtained from numerical simulation was topologically optimized using Tosca software by taking the volume and strain energy as the optimization objectives.A tension and compression bar model was built.With the damage mechanism of the box retaining wall structure,the bearing capacity formula of three primary modes of structural damage,including the side wall compression damage mode,the water-facing retaining wall damage mode,and the cluster-connected tensile damage mode,were derived.Comparative analysis within practical engineering contexts indicates that after 900 iterations of model optimization,the optimized configuration and strain energy almost remain consistent.The load carrying capacity of the prefabricated concrete box retaining wall structure based on the strut-and-tie model is lower than those of the code and the finite element simulation,but the errors are within the range of 16%,thereby validating the method's rationality.
作者 蔡建国 钱润民 陈中向 冯健 Cai Jianguo;Qian Runmin;Chen Zhongxiang;Feng Jian(Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education,Southeast University,Naniing 211189,China;School of Civil Engineering,Southeast University,Nanjing 211189,China)
出处 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第3期639-646,共8页 Journal of Southeast University:Natural Science Edition
基金 国家重点研发计划资助项目(2021YFB3802000)。
关键词 装配式混凝土箱体挡墙结构 受力机理 数值模拟 拓扑优化 拉压杆模型 prefabricated concrete box retaining wall structure force mechanism numerical simulation topology optimization strut-and-tie model
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