型钢混凝土框架结构基于增量动力分析的抗震性能评估

Seismic performance evaluation of SRC frame structures based on incremental dynamic analysis

增量动力分析(IDA)是进行结构抗震性能评估的一种有效方法。根据IDA方法的原理和特点,提出用其评估型钢混凝土(SRC)结构在不同强度地震作用下变形和延性能力的具体步骤,并将结构不同性能水平极限状态和IDA曲线的斜率联系起来,结合现有试验确定各性能水准对应的曲线斜率下降幅值。在所提混凝土和钢材本构模型的基础上,采用IDA方法对一规则SRC框架结构进行分析,研究结构在各性能水平的层间位移角和延性分布情况,单条和多条地震记录的IDA曲线表明,SRC框架在多条地震记录下均具有良好的抗震性能。

Incremental dynamic analysis （IDA） is an effective method for evaluation of seismic performance of building structures. Based on the principle and characteristics of IDA method, evaluation steps for investigating deformation and ductility of steel reinforced concrete （SRC） structures under increasing earthquake loading are put forward. Limit states of different performance levels for the structures are connected with IDA curve slopes, of which the decrease amplitude is determined according to current test data. Based on the proposed constitutive model of steel and concrete, a regular steel reinforced concrete frame structure is analyzed with IDA method, and the distribution of story drift angle and ductility for four performance levels are investigated. The calculation results show that the SRC frame has better seismic performance under random earthquake waves.