Study On Seismic Behavior Of Special-shaped Columns

R, C, special—shaped columns frame is a popular structure and will be widely used in house buildings. But because much higher stress exists in the discontinous parts and corners of the cross section ,and severe destruction under earthquake happens to the R, C, special—shaped column frame .in order to generalize R, C special—shaped column frame, its seismic behavior is studied ,specially the R, C, special—shaped column frame which the stiffness center and mass center are not coincident.As for the special of the R, C, special—shaped column section, systemical analysis to every column is done: geometry character of L, +, T, —shape sections section's stress and strain in the function of lever load .this is the basis of the column's dynamic and antiseismic analysis in the whole frame.A three—dimension irregular solid element model is established for a special—shaped column frame, model analysis of ANSYS dynamic analysis is carried by subspace method, results denote it exists serious torision phenomena on the spectral analysis of the structure, make use of frequency value of model analysis ,as well as design reacting spectral curve of anti—seismic specification ,to work out seismic acceleration value under every step frequency, which is used to react the frequency of the spectrum—acceleration value, to calculate the reaction of the structure under seismic reacting spectrum. From the result, the column evident.On the time interval analysis of the structure ,adopt acceleration—time earthquake wave input provided by local Earthquake Bureau. Due to ground shock existing hyperdimension ponderance, and excentric structure can produce torision influence at earthquake happen, therefore, besides unilateralism earthquake input at analysis, stress analysis of bimodality earthquake on the structure should be considered .Work out stress of relevant structure position and the relevant time travel curve. This result shows that the earthquake is in evident response to the different intensity structure. But all analytic result can meet the anti —seismic conditions. Earthquake—resistant behavior of the structure is in good condition. This result also validates the conclusion that the irregular—shaped columns has a serious earthquake—resistant behavior, we must adopt some consolidate measures.In the text, we adopt incline consolidate measure results of the time interval analysis of the R.C. special-shaped columns frame with incline consolidate measwre and without incline consolidate measure are compared, this shows the displacement of the frame with incline consolidate measure is great decreased, the function of anti-torision is great improved. So from the results incline consolidatemeasure can improne the earthquake-resistant behavior of the R.C. Spcial-shaped columns.