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根据型钢混凝土(SRC)框架结构的特点,将其性能划分为基本完好、轻微损坏、中等破坏和防止倒塌四个水平,并用层间位移角限值予以量化;将SRC多自由度体系转化为等效单自由度体系,导出了相应的等效参数,并根据其性能水平确定出结构的目标位移。在此基础上,提出SRC框架结构基于位移的设计步骤,并依此对结构进行承载力设计,用静力弹塑性分析方法对所设计的SRC规则框架结构进行推覆分析,校核结构的侧移形状与初始设计侧移曲线是否一致,在不满足变形需求时,用推覆至该性能水平时的侧移曲线作为修正后的侧移曲线重新计算。算例分析表明,文中方法简便实用、结果精确,能够实现SRC框架结构基于位移抗震设计的目的。
According to the characteristics of steel reinforced concrete (SRC) frame structure, its performance is divided into four levels which are basically intact, slightly damaged, moderately destroyed and prevented from collapsing, and quantified with the limit value of interlayer displacement angle; the SRC multi-degree of freedom system is converted into Efficiency single-degree-of-freedom system, derived the corresponding equivalent parameters, and according to their performance level to determine the structure of the target displacement. Based on this, the displacement-based design steps of SRC frame structure are put forward. Based on this, the design of bearing capacity of SRC frame structure is carried out based on the static elasto-plastic analysis method. Whether the shape of the shift is consistent with the initial design sidetracking curve is recalculated using the sidetracking curve when the shape is pushed to the performance level as the corrected sidetracking curve when the deformation needs are not met. The case study shows that the method in this paper is simple and practical with accurate results and can achieve the purpose of displacement-based seismic design of SRC frame structure.