Research And Application On Static And Dynamic Performance Of Frame-tube Structure With Inclined Columns

With the continuous pace of modernization,the traditional single geometric form of the building has been unable to meet the requirements of urban novelty construction.The facade shape of super high-rise buildings with slanting columns is unique and can enhance the visual impact,so the use of oblique column in super high-rise buildings has increased.Although the arrangement of the inclined columns satisfies the requirements of the faculties and the diversification of the functions,its force performance is always controversial for the vertical structure of the oblique pillars is prone to stress concentration and it is likely to produce weak parts.As an important component in the structure,the effect of the inclined column on the structural performance of the structure is related to the safety of the whole structure.Therefore,it is very important to study the static and dynamic performance of the frame-tube structure with inclined columns.Based on a Shanghai building,the finite element models of frame-tube structure of arranging the inclined columns or straight columns in the lower part are built.By comparing the performance of the two models under static load and dynamic load,it is concluded that the structure arranging the inclined columns in the lower part has higher stability,smaller vibration periods and higher lateral stiffness than the structure arranging the straight columns in the lower part under the same condition.By comparing partial components internal force of the two models,it is concluded that the arrangement of the inclined columns leads to a significant increase in the axial force of the inclined columns and the shear force and bending moment of the frame beams connected to the inclined column.In the actual building,the inclined columns are arranged in a few layers of the building,not arranged along the height of the whole building.Partial components internal force of the model with two different inclined and columns straight transition are analyzed.The results show that the model with curved column transition is more favorable to the structural components,especially for the components of the outer frame.By the nonlinear time history of the frame-tube structure with inclined columns,it is found that the weak parts of the model are the beats connecting beams inclined column and coupling beams.In view of the weak parts,this article puts forward some improvement measures and the finite element analysis of the models is carried out.The internal force and plastic hinge of some models under rare occurrence earthquakes are obtained.It is concluded that the measures can improve some components’ force performance.In addition,according to the theory of structural stability and redundancy theory,it is concluded that the adjustment measures in coupling beams can increase the redundancy of building model.