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KEYWORD: Damaged structures; Seismic performance; Evaluation method; Target displacement; Inter-story drift ABSTRACT: IDA need elastic and plastic analysis of the structure with a large number of different intensity ground motion inputs and had some disadvantages such as high cost of computation, retraction and non-monotonicity of its curve. An improved method of static elastic-plastic analysis with the consideration of incremental idea and structural dynamic characteristics was presented. Calculation expressions of lateral force loading mode and target displacement based on the modal combination were derived considering combination of modal lateral forces for pushover analysis, and some implementation steps of seismic performance evaluation of structures based on DIPA method were given. Accuracy and effectiveness of DIPA method were verified by an example of a 5 story reinforced concrete frame structure. DIPA analysis method changed quantity and mode of vibration mode combination ,it had consideration of the influence of high mode and acquisition of accurate calculation results, also the effect of DIPA analysis method was consistent with IDA method. It was capable of reflecting the real seismic response of the structure with simple calculation process and less computational cost.

Research on modified incremental pushover analysis considering dynamic characteristics of damaged structures