Comparative Analysis On Calculation Methods Of Lateral Stiffness Ratio Of Frame Structure

It is an important structural concept design to make structural lateral stiffness to beuniform. Specifications of China, the United States, Japan and some other countrieshave requirements on the control of lateral stiffness. Currently the lateral stiffness of theframe structure is controlled by structural lateral stiffness ratio calculated by story shearor inter-story drift. Many scholars have done a lot of research on this calculation methodand achieved certain achievements. Variation of story height in the buildings is a normalphenomenon, so the method above is often too strict and difficult to meet codes whenstory height ratio is large. However, the method calculating the lateral stiffness ratio bystory shear and inter-story drift angle can well solve this problem. Therefore this articlewill analyze the effects of controlling lateral stiffness with the two calculation methodsof lateral stiffness ratio.The paper analyzes mainly the applicability of the two kinds of calculationmethods of lateral stiffness of the frame structure.《technical specification for concretestructures of tall building》JGJ3-2010specification (referred to JGJ norms below) and《technical specification for concrete structures of tall building》15-92-2013specification (referred to JGJ norms below) adapt respectively one of two kinds ofcalculation methods of lateral stiffness ratio and give their limits. The analysis on steelframe structures for its simple constitutive relations can better reflect variation aboutlateral stiffness ratio of the structures under earthquake. The chapter Ⅱ firstly analyzesthe performance of three categories of steel frame structures under rare earthquake.Thechapter III researches reasonable limits of two kinds of calculation methods of lateralstiffness ratio from the perspective of inter-story deformation control，and studys thecontrol basis on certain limits. The chapter Ⅳ analyzes the third category of modelsabout reinforced concrete structure with ABAQUS elasto-plastic analysis method toverify the suitability that the steel frame structure have certified. By a series of analysiswork,this paper gets the following conclusions：①Lateral stiffness ratio calculation methods and limits of JGJ specification for ismore strict with the control of deformation mutation,for1.1；Lateral stiffness ratiocalculation methods and limits of DBJ specification for is more weak with the control ofdeformation mutation,for1.2。 ②The paper finds with the analysisi of steel frame structures that: appropriatemethod must be taken to control the lateral stiffness of the structure to prevent thestructure to collapse for accumulation of the structural deformation under rareearthquake. The steel frame structure and reinforced concrete frame structure whichlateral stiffness ratio only meets norms limits of DBJ norms rather than norms limits ofJGJ norms still have a good performance under rare earthquake,so we think thecalculation method of lateral stiffness ratio and limits of DBJ norms also have a goodcontrol effect about uniformity of lateral stiffness.