Pushover Analysis Of Reinforcedconcret Frame Structure

Performance-based seismic design as an advanced seismic design ideas, has beenrecognized by most countries in the world, but need to be improved in many ways. Thispaper presents displacement-based seismic assessment methods base on frameworkangular, has a certain reference value and engineering significance for Seismicevaluation of the framework structure, and studied several factors that have an impacton the shape of the Pushover curve on the software model.This paper systematically introduces design theory of performance-based seismic,describes the basic principles of static nonlinear analysis methods and development athome and abroad,6reinforced concrete frame structure was analyzed using theSap2000program. The main contents include the following aspects:(1) Using Sap2000structural analysis programs, use three different lateral loading(uniform, inverted triangle, modal) on Pushover analysis of six reinforced concreteframe structure (two three, two four-story, two six), get different structures pushovercurve on different loading modes, comparing the change of different curves. Using theequal energy method to curve the line and study the variation of the stiffness of line.(2) Introducing structural equivalent modal participation factor to consider theimpact of higher modes, research multiple degrees of freedom conversion relationshipwith a single degree of freedom, and to study the situation to consider multi-modal.(3) Using multiple yield displacement quantitative frame structure of the differentplastic state. Research whole process of structure from the elastic to underminedisplacement of the apex angle and drift angle and structural changes of the deformedshape, And comparative analysis with the deformed shape of structure of the first mode,simplified theoretical formula. Compare the variation of each layers of a structurebetween the interlayer displacement and shear.(4) Studied the capacity curve equivalent bilinear model.(5) Summarizes several representative countries of reinforced concrete framestructure vibration period empirical formula, Compare6examples empirical formulacalculation and results of Sap program, given in the proposal of select the empiricalformula. Using energy method to studied transient cycle and transient damping ratio indifferent plastic state. (6)Study the software parameters on the structure of Pushover Curve on Sapgrogram.(7) Seismic performance evaluation based on displacement angle for frame structureunder multiple intensities is putted forward. The curve of Sa-Sdis transformed intocurve of α-Sd. From the comparative analysis of seismic action with the curve of α-Sd,then determining the performance intersection point of structures at the stage of smallearthquakes and large earthquakes in different intensities, using the roof displacementangle and inter-story drift angle assess the seismic performance of structure undermultiple intensities.