Analysis Of Seismic Performance Of Infilled-Wall RC Frame Strctures

Wall-Infilled frame structure is a structural system that is widely used inengineering. Mainly referring to the structural system composed of beams andcolumns that are connected by nodes, wall-infilled frame structure bears the verticaland horizontal load, belonging to the frame structure.The infilled wall and the framework together, and the interaction between the two greatly improves the seismicperformance of wall infilled frame structure. which is hugely different from the framestructure. However, in the existing seismic design specifications, the cooperativework between the infilled wall and the frame is generally not considered;rather, theframe model featuring cycle reduction is adopted in the structural seismicdesign.Nevertheless, a lot of earthquake damages and studies have shown that theexclusion of the synergy of the infilled wall may lead to the insecure structure. Basedon previous researches, we have conducted the following work:1.Referring to the stiffness values of the infilled wall at different stages given byvarious scholars and the principle of equivalent stiffness, the author summarizes theequivalent unit applied in the first phase of seismic design—formula used in the widthcalculation of the cross-section of the equivalent tension and compression bracemodel. SAP2000, the finite element analysis software is adopted to establish theequivalent diagonal strut model and conduct the Pushover analysis, which, whencompared with the experimental results of relevant scholars, brings out relativelygood fitting results.2.Considering the stiffness deduction of the infill wall on different floors, theauthor establishes the equivalent bracing layer model by means of the finite elementanalysis software SAP2000and conducts the modal analysis. Through the comparisonof the infilled wall frame model and the pure frame model, the author inds out that theseismic responses (side pillar shearing force and relative storey displacement) arequite different and probes the reasonable periodic reduction coefficient of the frame inthe specifications.3.Adopting the modal decomposition response spectrum method and the timehistory analysis method and comparing the calculation results of the existing seismiccomputational model (taking into account the pure periodic reduction frame model) with those of the equivalent bracing layer model, the author probes into the safety ofthe standard design method.4.Based on the stiffness values of the infilled wall subject to severe earthquakesgiven by various scholars, the author establishes the equivalent tension andcompression brace model in severe earthquakes, and investigates the different seismicperformances of the existing standard calculation model and the equivalent tensionand compression brace model by means of the pushover analysis method.