【作者】 李琪；

【导师】 王德信；

【作者基本信息】 河海大学 ， 工程力学， 2005， 博士

【摘要】 本文研究的主要内容是在基于性能的抗震设计基本思路下,以常见的多层钢筋混凝土框架结构为研究对象,针对目前基于位移设计方法中存在的若干问题,研究多层框架结构基于位移的抗震设计方法,以期建立合理的基于位移设计方法和实现步骤,本文的主要研究工作和成果如下: 一、指出了目前基于力分布模式的静力弹塑性分析方法中存在的问题,提出了基于位移模式的静力弹塑性分析的方法,克服基于水平力模式分析方法存在的理论不足,较好地反映结构在地震作用下的弹塑性位移特征,其稳定性好于力分布模式,也便于确定结构层间位移,进而推出构件的弹塑性变形。通过大量的弹塑性分析,提出了多层框架结构位移模式保持一致的条件和位移模式的确定方法。 二、研究了基于位移模式的等效单自由度方法,将多自由度体系等效为单自由度体系,并通过基于位移模式的静力弹塑性分析得到等效单自由度体系恢复力模型骨架线,建立了等效力—位移骨架线特征参数的计算公式。 三、对等价线性化方法进行了研究,将弹塑性体系等价为弹性体系,建立了等效单自由度体系的等价阻尼比和延性系数的关系。并利用原规范给出的地震影响系数曲线推出等效单自由度弹性体系反应谱,确定地震弹塑性位移需求公式。 四、建立基于位移模式的多层框架结构抗震设计方法的基本方法和步骤。通过工程算例,验证了本文建议方法的合理性,且与时程分析结果进行了对比,表明本文方法是可行且是合理的。更多还原

【Abstract】 Based on the idea of performance-based seismic design, this dissertation proposes the extant problems of displacement-based seismic design method (DBSD) and presents a research on DBSD methodology for RC frames. The more reasonable approach and specific procedures of DBSD are expected to be established. The main achievements of this dissertation are described as follows:(1) The problems of load-pattern-based nonlinear static analysis (pushover) being pointed out, this dissertation proposes displacement-pattern-based nonlinear static analysis method. This paper indicates that displacement-pattern-based nonlinear static analysis method can conquer the theory inadequacy of load-pattern-based method and is more capable to reflect inelastic behavior. The stability of displacement-pattern is better than load-pattern and this method is easier to obtain structure interstory displacement and element inelastic deformation. By a great number of calculation and comparison, the displacement-pattern of frame structures is analyzed, and the consistent condition and definition method are provided.(2)By studying displacement-pattern-based method, the multi-degree-of-freedom system is equivalent to a single-degree-of-freedom system. The resilience of the single-degree-of-freedom system is obtained by displacement-pattern-based nonlinear static analysis method and the calculation formulas for characteristic parameters of equivalent force- displacement skeleton line are established.(3) The equivalent linearization method is studied and the inelastic system is replaced by elastic system. The relations of equivalent damping ratio and ductility coefficient for equivalent single-degree-of-freedom system is suggested. Based on the equivalent elastic system and displacement spectrum with different damping coefficient, the demand of inelastic displacement under earthquake is determined.(4) The basic steps for displacement-pattern-based seismic design method are provided. A practical example of frame structure is used to validate this methodology, and is compared with the result of time history analysis. The result indicates the suggested method is easy to be used and reliable.更多还原