钢框架-支撑剪切板结构抗震性能分析

SEISMIC BEHAVIOR OF STEEL FRAME-BRACED SHEAR PANEL STRUCTURES

钢框架-支撑剪切板结构是用X型支撑将剪切板与钢框架相连构成的一种新型抗震结构体系。地震作用下,剪切板屈服耗能,保护主体结构。震后更换损伤的剪切板,可以实现结构功能的快速恢复。提出框架-支撑剪切板结构的抗震性能目标和设计方法,设计了平面尺寸相同,但层数和跨度不同的结构体系。利用ABAQUS软件建立结构的有限元模型进行水平推覆分析。分析结果表明:框架-支撑剪切板结构具有明显的屈服时序和屈服后刚度。设置支撑剪切板能显著提高框架结构的承载力和初始刚度。支撑剪切板的跨度对结构初始刚度影响较大。框架和支撑剪切板的相互作用不明显,设计时可将两者的初始刚度和承载力进行叠加。

Steel frame-braced shear panel structure is a new type of seismic-resistant system composed of steel shear panel connected with steel frame by concentric X-braces. The shear panel can yield and dissipate energy to protect the frame from damage under earthquake. The quick resilience of the structural functions can be achieved by replacing the damageconcentrated shear panel. In the paper,the seismic performance objectives of this structural system were developed as well as seismic design method. The structural systems were designed with emphasis on varying the number of stories and frame width,while all systems had similar overall plan dimensions. These structural systems were studied with numerical models by using nonlinear static analysis. The results demonstrated that the systems had desirable yielding sequence and post - yielding stiffness. The initial stiffness and bearing capacity of framing system could be developed significantly by setting up the braced shear panels. The variation of bay width highly affected the initial stiffness of the structural systems. For design purpose,the initial stiffness and bearing capacity of framing system and shear panel system could be added together since the interaction between the shear panel and the frame was not obvious.