带斜筋的单排配筋混凝土剪力墙结构抗震机理研究

With the elimination of traditional clay-brick structure, a new multi-story residential structure system desiderates to be studied. In this project, a kind of "RC shear wall with bidirectional single row of steel bars and diagonal reinforcements" is put forward. Compared with the normal RC shear wall structure with double rows of steel bars, it has advantages of smaller wall thickness, simpler construction details, higher anti-shearing capacity, and lower cost. It can also prevent the base sliding. Compared with multi-story masonry structure, this new structure system has a significant improvement on seismic performance and an equivalent construction cost. Low-frequency cyclic loading test and shaking table test of this new shear wall with different design parameters will be carried out in the project. The load-carrying capacity, ductility, stiffness, hysteresis property, energy dissipation and failure characteristics will be studied. The cumulative damage evolution process and yielding mechanism will be analyzed and the seismic mechanism will be revealed. The bearing capacity calculation model and the restoring force model will also be established. In addition, the elastic-plastic finite element model will be proposed for numerical simulation to optimum design parameters. Seismic design methods and constructional measures will be proposed in order to lay a foundation for the engineering application.

传统粘土砖多层住宅结构已逐渐被淘汰，研究新型多层住宅结构体系已成发展亟需。本项目提出了一种带斜筋的单排配筋混凝土剪力墙多层住宅结构体系，与普通双排配筋混凝土剪力墙结构相比，具有墙体薄、施工简便、加配斜筋提高抗剪能力、防止基底滑移、造价较低的优点。与多层砌体结构相比，抗震性能显著提高，造价相当。将较系统地进行不同设计参数的带斜筋的单排配筋混凝土剪力墙低周反复荷载试验和模拟地震振动台试验，研究其承载力、延性、刚度、滞回特性、耗能能力和破坏特征，分析累积损伤演化过程和屈服机制，揭示抗震机理，建立承载力模型和恢复力模型，提出弹塑性有限元模型并进行数值模拟，优化设计参数，给出抗震设计方法和构造措施，为工程应用奠定基础。

传统粘土砖多层住宅结构已逐渐被淘汰，研究新型多层住宅结构体系已成发展亟需。本项目提出了一种带斜筋的单排配筋混凝土剪力墙多层住宅结构体系，较系统地进行了不同剪跨比、不同斜筋角度、不同斜筋配置量、不同轴压比、不同截面形式、有无洞口的带斜筋单排配筋混凝土剪力墙低周反复荷载试验和模拟地震振动台试验，研究了其承载力、延性、刚度、滞回特性、耗能能力、动力特性、地震反应、破坏形态，分析了累积损伤演化过程和屈服机制，揭示了抗震机理，建立了承载力计算模型、恢复力模型和弹塑性有限元分析模型，进行了深入的数值模拟计算，优化了设计参数，给出了抗震设计方法和构造措施，为工程应用奠定了基础。研究结果表明，对于单排配筋混凝土剪力墙，配置斜筋可以有效地控制其剪切变形，避免墙体底部施工缝处发生剪切滑移，限制墙体斜裂缝开展，使其抗震性能优于不带斜筋的剪力墙；合理地配置斜筋，可以明显提高混凝土剪力墙的抗震耗能能力，获得性价比较高的抗震墙，当分布钢筋配筋率为0.15%，斜筋配筋率为0.1%时，效果较好；扇形布置斜筋，有利于提高单排配筋混凝土剪力墙的延性和降低刚度衰减；在联肢剪力墙的底部墙肢和连梁中增设斜筋，可明显提高联肢墙的延性和抗震耗能能力。带斜筋的单排配筋混凝土剪力墙多层住宅结构与普通双排配筋混凝土剪力墙结构相比，具有墙体薄、施工简便、造价较低的优点；与多层砌体结构相比，抗震性能显著提高，造价相当，具有良好的推广应用前景。