装配式框架结构一致多尺度模拟方法与动力响应研究  

Study of concurrent multi-scale simulation method and dynamic response for precast concrete frame structure

作　　者：陈浩[1,2] 李宏男 付兴[1] CHEN Hao;LI Hongnan;FU Xing(School of Infrastructure Engineering,Dalian University of Technology,Dalian 116024,Liaoning,China;Liaoning Construction Science Research Institute Co.,Ltd,Shenyang 110052,Liaoning,China)

机构地区：[1]大连理工大学建设工程学院,辽宁大连116024 [2]辽宁省建设科学研究院有限责任公司,辽宁沈阳110052

出　　处：《建筑科学与工程学报》2024年第6期49-60,共12页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(52027811)。

摘　　要：为了在有限算力下尽可能提高装配式框架结构的有限元分析精度,且对结构的局部损伤特性和整体结构响应开展并行分析,提出了一套应用于装配式混凝土框架结构的一致多尺度模拟方法。基于内聚力模型来考虑新旧混凝土的界面接触问题,采用组合多点约束法实现多尺度模型的界面连接;结合预制混凝土梁柱节点试验对该模拟方法的合理性进行了验证,并通过参数分析得出装配式混凝土框架结构节点区域细观尺度模型的合理取值范围;最后采用提出的一致多尺度模拟方法,分析了某装配式混凝土框架结构在地震作用下的动力响应。结果表明:不同尺度模型耦合界面宜取在新旧混凝土交界面之外,建议长度为h/3~h(h为梁高),距离灌浆套筒端部至少留出1/2个套筒的长度;与宏观梁单元相比,采用一致多尺度模拟方法得到的结构整体响应更加精确且能够反映节点区域的真实塑性发展规律;提出的一致多尺度模拟方法可为复杂装配式混凝土结构的整体计算分析及关键节点的精细化仿真提供有效途径。In order to maximize the accuracy of finite element analysis of precast concrete frame structures with limited computational resources as well as analyze the local damage characteristics and the overall structural response simultaneously,a concurrent multi-scale simulation method for precast concrete frame structures was proposed.The interface contact problem between new and old concrete was taken into account on the basis of the cohesive model and the interface connection of multi-scale model was realized by multi-point constraints method.The rationality of the simulation method was verified by comparing with the test of precast concrete beam-column joint.Besides,the reasonable value range of the fine-scale of precast concrete frame joint region was obtained by parameter analysis.Finally,the dynamic response of a precast concrete frame structure under seismic action was analyzed using the proposed concurrent multi-scale simulation method.The results show that the coupling interface of different scale models should be taken outside the interface between new and old concrete,and it is recommended that the length should be h/3-h(h is beam height),and at least 1/2 of the grouting sleeve length should be left from the end of the grouting sleeve.The response of the structure obtained by the concurrent multi-scale simulation method shows advantages in simulation precision and can reflect true plastic development law of the joint compared with the macroscopic beam element.The proposed concurrent multi-scale simulation method can provide an effective approach for the overall analysis of complex precast concrete structures and the precise simulation of key joints.

关 键 词：装配式混凝土结构 一致多尺度 内聚力模型 梁柱节点 动力响应 

分 类 号：TU756[建筑科学—建筑技术科学]