The Study Of Earthquake Resistance Impact Of The Infilled Walls To The Reinfroced Concrete Frames

Infilled wall frame strueture is a kind of strueture system used more widely currently by reason of its layout flexible and the function of rooms easy to adjust. Because of the complexity of frame-infill interaction,the influence of infilled wall on structure is often neglected or just considers its influence on the structural natural vibration period in the structural design and analysis. This means consider the impact of the infilled wall on the whole just on the calculation of the cycle. So the effect of absorbing earthquark energy have amplified.When calculating the entire struetural loads,the component's load are assigned on the fram ceomponent's stifiness,overlooking infilledwall's bearing capacity and disadvantage factor. However, not considering the function of the wall is not always safe. Especially,through housing damage survey of infilled frame structure in Wenchuan earthquake found a large number of infilled frame structure of underlying weak layer(the bottom of non-filled walls,the upper wall of clouds filling)of the housing system did not appear"weak beam strong column"of the failure mode,but the weak layer in the bottom of the"weak Liang-chu"in failure mode. Because of the Problems above, the author made the following work:1. The paper establishes equivalent bracing layer model using SAP2000.Comparing pure frame work model with equivalent bracing layer model,standard cycle reduetion factor is proposed and proved by several examples.2.The paper finds the differences between the current seismic design model and the equivalent bracing layer model with bottom wall considered the cycle reduction by using response spectrum analysis and time history analysis. The Calculations in "Code for Seismic Design of Buildings" is security.3. Using response spectrum analysis and time history analysis by sap2000,the paper established with the bottom layer at the bottom of the different lateral stiffness than the equivalent non-filled wall bracing model,and then comparing with the pure frame work model inorder to get a reasonable Stiffness ratio.