The Research On The Diagonal Web Member Truss Strengthened Story In High-Building Structures

With the increasing of the height of tall buildings, structural materials and composition, structural system and form are constantly developed and created. Frame-tube with strengthened layer can improve double resist lateral force system and augment lateral displacement stiffness of structure, which becomes an essential tall building types. Because of the complexity of the horizontal strengthened layer which will cause saltation of rigidity of structure, accompanied by the change of transfer force, therefore, the structure is easy to form weak layer under the earthquake influence and the structure is difficult to present yield mechanism of ductility, leading to structural damage or even collapse.Nowadays, in the structure of reinforced concrete structure of tall buildings and super-tall buildings at home, the main style of strengthened layer outriggers is the system of abdominal reinforced concrete beam. Therefore, the research of diagonal web member truss strengthened layer outriggers of reinforced concrete is still very few. However, applying diagonal web member truss of reinforced concrete to tall buildings can bring many problems. Therefore, this paper have done some researches on these aspects. The main research contents are as follows:1.The research on the best position of strengthened layerTake diagonal web member truss of reinforced concrete tall buildings of 33 layer and 42 layer for example. By using the three-dimensional finite element analysis software Sap2000 established structure model and mode-superposition response spectrum method, the thesis analyzes regularity of distribution along the floor the displacement of the single-channel strengthen layer setting in different locations. Through analysis, the thesis indicates that if the structure only can control structural sidesway, setting a reasonable range of setting oblique abdomen bar truss of reinforced concrete; If the structure takes consideration into both structural sidesway and relative storey displacement, it will gives an optimal position of the diagonal web member truss of reinforced concrete.2.The research on mechanical behavior of strengthen layer structureTake the diagonal web member truss of reinforced concrete tall buildings of 33 layer for example, applying the mode-superposition response spectrum method, the thesis analyzes the position and the number of strengthen layer influence on the whole stiffness of structure and components internal force in details, and gets some effective conclusions.3.The research on style of arms of truss strengthen layer structureThrough the elastic time-history analysis on the structure of the outriggers of different truss forms in SAP2000 and the influence on frame-tube of different reinforced concrete forms integral behavior of the structure and components internal force, the thesis concludes that the diagonal web member truss of the herringbone type is propitious to earthquake-resistance.4.The research on stiffness of strengthen LayerTake the building of two strengthened layers for example. The thesis analyzes the strengthened layer outriggers stiffness and the comparison of the inner cylinder, as well as the outside framework of the column axial stiffness and the stiffness of the tube parameters on the structural comparison of the summit displacement and the components of internal forces in details. And the paper proposes strengthened layer outriggers of diagonal web member truss and the inner cylinder comparison of stiffness, as well as the reasonable scope and limits of column axial stiffness and the inner tube comparison of the rigidity.