Research On Deformation Control Of High-Rise Steel Structure Advanced Analysis Method

Advanced analysis method is used for structural steel structure design,which don't need to separate each component calculation,It can get overall structure bearing capacity and deformation performance,this is the structure of the traditional design method can't been matched.For example,The calculation length design method is adopted,which needs to internal force combination and then find the most adverse internal force calculation of each component,if not meet the requirements,It will need to adjust repeatedly component cross section to check,it greatly increases the amount of calculation.Therefore,the development and perfection of steel structure advanced analysis method is the trend of The Times.Existing steel structure design codes at home and abroad,most of them are considered in the design of the ultimate bearing state as an advanced analysis method for the rule,but for some sort of smaller lateral stiffness of high-rise steel frame structures,using this method have limitations,which often exceeds the pillars of lateral structure normal use limit state deformation limit value,the structure of the cross section control role in the deformation limit.In view of the above problems,the main research has been carried out in this paper as follows:Employing ANSYS finite element software to build double span double hysteretic performance analysis of steel frame structure model,and compared with the existing test results,verify the validity of the modeling method.Respectively with two spans to four spans,twenty to fifty layers of unbraced steel frame structure modal analysis and the braced steel frame structure modal analysis,compared with the support form,structure,layers and considering the different initial geometric imperfection have an influence on the structure natural frequency.Support decorate a form to a little effects on the natural frequency of the structure itself,and without support for its influence is very obvious;Both unbraced steel frame structure and braced steel frame structure,whose layers have great influence on the natural frequency of structure,along with the increase of the layer number is less natural frequency,and decreased significantly.National standard way of considering initial geometric imperfection on little impact on natural frequency of the structure.By modal analysis to calculate vibration frequency and vibration mode of the structure of the trend,the eigenvalue buckling analysis results can be used as add structure as a whole and the individual component structure design,a method of the initial geometric imperfection.A great deal of full-path analysis about unbraced steel frame structure and the braced steel frame structure have been carried with different parameters,second-order influence parameter,the depth-width ratio,column slenderness ratio and general stiffness ratio of beam to column.selecting two spans twenty layers unbraced steel frame structure,two spans thirty layers unbraced steel frame structure,three spans twenty layers unbraced steel frame structure,three spans four layers braced steel frame structure,three spans fifty layers braced steel frame structure and four spans fifty layers braced steel frame structure to be carried on the low cycle hysteretic performance of reciprocating load loads analysis,comprehensive assessment of the influence of various parameters on the structural seismic performance.Research results show that the structure is reached when the ultimate bearing capacity,its pillars of lateral has gone beyond normal use limit state under the lateral limit of the allowable bearing capacity of the structure controlled by deformation limit of serviceability limit state,thus put forward a kind of direct analysis method based on deformation control of tall steel structure.Through the SAC Steel Project in the design of five spans nine layers unbraced steel frame structure for calculating the bending Steel frame,further validation and improve the direct design method based on deformation control of the correctness and applicability.Employing neural network to forecast the second order of lateral pillars of the unbraced steel frame structure and the braced steel frame structure,which make second-order influence parameter,the depth-width ratio,column slenderness ratio,general stiffness ratio of beam to column and deformation limit as the input variable.The second order of lateral pillars as the output variable,which can quickly determine the advanced analysis method based on displacement control for structure design of the scope of application.The predicted result is compared with the practical calculation formula of the second order lateral of the unbraced steel frame structure and the braced steel frame structure,which proved it's correct and effective to predict structural deformation performance based on neural network.