未预裂型钢筋混凝土直接剪切的拉压杆模型受力机理  

Bearing Mechanism of Strut-and-tie Model for Initially Un-cracked Direct Shear of Reinforcement Concrete

作　　者：张羽 

机构地区：[1]武汉轻工大学土木工程与建筑学院,湖北武汉430023

出　　处：《混凝土世界》2025年第3期63-67,共5页China Concrete

摘　　要：本文以未预裂型推出构件直剪为研究对象,采用ABAQUS有限元软件和渐进性结构拓扑优化(ESTO)程序,结合拉压杆模型进行分析。在线弹性阶段,建立二维平面应力模型,通过ESTO程序,确定适合的拉压杆模型。在非线弹性阶段,通过引入混凝土塑性损伤模型,模拟混凝土在受力过程中的非弹性行为,使用加载分析得出未预裂型直剪的具体破坏机理,成功揭示了直剪面上的应力分布和损伤发展过程,探讨了未预裂型直剪的力学行为及其破坏机理,为相关结构设计和承载力计算提供参考和指导。The study focuses on the initially un-cracked push-off test direct shear as the research object,adopts ABAQUS finite element software and the evolutionary structure topological optimization(ESTO)program,combined with the strut-and-tie model for analysis.In the linear elastic stage,a two-dimensional plane stress model is established.Through the ESTO method,a suitable strut-and-tie model is determined.In the non-linear elastic stage,by introducing the concrete plastic damage model,the inelastic behavior of concrete during the force process is simulated.The specific failure mechanism of initially un-cracked direct shear is obtained through loading analysis,successfully reveales the stress distribution and damage development process on the direct shear plane.The mechanical behavior and failure mechanism of initially un-cracked direct shear are discussed,providing reference and guidance for related structural design and bearing capacity calculation.

关 键 词：未预裂型直接剪切 拓扑优化 受力机理 拉压杆模型 有限元 

分 类 号：TU375[建筑科学—结构工程]