| 《Code for seismic design of buildings》(GB50011-2010) for the first time determined to standardize the form of performance-based seismic design method. Plastic deformation in the earthquake and the seismic capacity as the design of control indicators. Rare earthquake, the building structure in a highly nonlinear state, and how to ensure that building structures seismic performance is the key in the seismic design. Dynamic elastoplastic analysis software through the building structure, building structure, the dynamic elastoplastic analysis to quantitatively determine the deformation of the building structure, carrying capacity and energy performance, the primary means of seismic design performance.At present, the domestic are frequently used in the elasto-plastic analysis software including ABAQUS, PERFORM-3D, SAP2000, EPDA, Midas, Building and GSNAP, etc. This paper the main work accomplished include:(1) Introduced the structure dynamic analysis basic equation and commonly used methods of solving differential equations, including center finite difference method, Newmark method, Wilson-θ method, Hilber-Hughes-Taylor method, and incremental iteration method commonly used. Through a practical project example, summarizes the time history analysis of seismic wave in the steps and methods.(2) Contrast the six software material model and the element model. Steel general bilinear skeleton line, concrete is the use of three linear skeleton line. one-dimensional components(such as column beam and support) use fiber bundle model or plastic hinge model, two dimension components(shear wall and slab) use the fiber bundle model, shell element damage model, elastic-plastic wall model or layered shell model. And to compare the software in the parameter setting and the computation result shows that the differences. (3) Single column and single shearwall of elastic-plastic calculated results and test results were compared. The calculated hysteresis curve and pseudo static test get hysteretic basic laws are consistent, explain dynamic elastic-plastic analysis results can be used as the basis for calculating the deformation of anti-seismic structure.(4) With the above six software for simple structure and the actual engineering are analyzed. Frame structure calculation results show that the software process curve when and injury parts are basically the same. The plastic hinge model SAP2000and PERFORM-3D calculation model for the second time in acceleration to peak, stiffness degradation is EPDA, GSNAP and Midas\Building more calculation model, the reason is plastic hinge model in to the yield point, bearing capacity down quickly. The shearwall structure calculation results show that the software process index and the area of injury when is different, but the basic laws are consistent. EPDA calculation model of minimum rigidity degradation, PERFORM-3D calculation model of stiffness degradation is the largest.(5) In the dynamic elastic-plastic calculation, a parameter setting whether reasonable will directly affect the calculation efficiency and effectiveness. This paper analyzes the unit division size and P-Delta effect the two parameters on the effect of calculation. Calculation shows that consider P-Delta effect on vertical component large effect on bearing capacity, the effect is not obvious horizontal component. Unit division size of the hinge beam-column elements number the impact is not big, great influence of shear wall, the wall unit size is larger, the structure and the basal shear displacement vertex small.(6) The actual engineering power elastic-plastic analysis worktime are large, this paper, from the model calculation efficiency, preparation, the convergence, output and judgment and so on four aspects are proposed.(7) This paper also GSNAP software to the dynamic elastic-plastic function test. Through a house and complex high-rise structure and a house44layer core tube structure respectively with the EPDA and calculated using ABAQUS software and comparing with the results verify the GSNAP software computing power and reliability. |
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