Study On Aseismic Performance Of 3D-frame With Special-section Column

It is advocated using space fully and freely following the development of living condition. Bulgy edges of column disappear while the column sections being designed to be shapes of "L" , "T" and "+" . Then the service efficiency of indoor space can be improved greatly. Study on structure with special-section column has begun on the world because of its superiority, but study on performance of 3d-frame with special-section column is still at initial stage. In order to put this kind of structure into practice properly, in this paper, analyzed the aseismic performance of the frame with PUSH-OVER method under the unilateral and the reversed cyclic loading and Dynamic and time-historical analysis method after studying nonlinear finite analysis theory on 3d-frame with special-section column, then supplied some test.The main contents in this paper:1. Nonlinear finite analysis theory of 3D-frame with special-section columnNonlinear finite analysis theory of 3D-frame with special-section column was proposed based on some necessary hypothesis and strain-stress constitutive equations of materials. According to the frame features such as irregular cross-section of the column, divided the frame into elements properly to obtain a simple calculation model. In this model, zonal discrete section method, eccentricity transition matrix in master-slave system were applied. Substructure, and static condensation were utilized in this model to increase computational efficiency. Utilized the differential superposition method to combine concrete with bar. Then the nonlinear finite analysis theory of 3D-frame with special-section column was presented.2. Static elasto-plastic analysis program of 3D-frame with special-section columnDuring analyzing the aseismic performance of 3D-frame with special-section column, PUSHOVER method was used. And self-modifying step-iterative method under condition of incremental displacement was applied to continue the calculation on descending branch. The PUSHOVER calculation program for analyzing the aseismic performance of 3D-frame with special-section column, which was based on nonlinear finite analysis theory of 3D-frame with special-section column, was set up andverified.3. Study on aseismic performance of 3D-frame with special-section column compared with 3D-frame with rectangular-section columnAfter studied on the aseismic performance of the 3D-frame with special-section column and 3D-frame with rectangular-section column, obtained common performance and specific performance of the two kinds of structure such as failure process, bearing capacity, lateral displacement, ductility, torsion, hysteretic performance, stiffness degeneracy and endogen force feature. The result of comparison on aseismic performance can be available to structure lectotype during design.4. Load influence on aseismic performance of 3D-frame with special-section columnAfter analyzed the 3d-frames with special-section column by PUSHOVER method under horizontal loading with various direction, under vertical loading with various arrangement and under various axial compression ratio, obtained aseismic performance such as failure process, bearing capacity, lateral displacement, ductility, torsion, hysteretic performance, stiffness degeneracy and endogen force feature. The result on aseismic performance of these frames under various loads can be available to loading treat during design.5. Influence of structure parameter on aseismic performance of 3D-frame with special-section columnAfter analyzed the 3d-frames with special-section column by PUSHOVER method with various length-width ratio of limb, with various distribution of bar on column section and with various ratio of reinforcement in column and beam, obtained aseismic performance such as failure process, bearing capacity, lateral displacement, ductility, torsion, hysteretic performance, stiffness degeneracy and endogen force feature. The result on aseismic performance of these frames with various structure parameters can be available to control structure parameter during design.6. Dynamic and time-historical analysis of 3D-frame with special-section columnGained dynamic performance of 3D-frame with special-section column after dynamic and time-historical analysis on the 3d-frames with special-section column under EL-centro seismic wave with 8 degree and 9 degree of seismic fortification intensity was carried on.7. Test of 3D-frame with special-section columnStudied service behavior and failure process of the 3D-frame with special-section column under the reversed cyclic loading with low frequency and explored aseismic performance of the 3D-frame with special-section column at elasto-plastic stage bypseudo-static test of single span and single story 3D-frame with special-section column under different direction horizontal load.Obtained aseismic performance of the 3D-frame with special-section column such as bearing capacity, lateral displacement, ductility, torsion, hysteretic performance, stiffness degeneracy and endogen force feature and gained service behavior and failure process of the 3D-frame with special-section column by study on aseismic performance of 3D-frame with special-section column. And gived out some suggestions for design of 3D-frame with special-section column.