Research On The Design Of Complex High-rise Steel Tower Structures Considering Diaphragm Effect

In recent years,along with the society development,more and more urban landscape sculpture were built to highlight the city connotation.Most of sculptures utilized steel structures as supporting system for its lightweight,high strength,and sound seismic performance.Architects also prefer using steel structures in the design of high-rise building with complex shape.The steel structures used in sculptures are usually more complex than common structures,which leads to great difficult in the analysis and design.So systematic researches on the sculpture structure is of great theoretical significance and vast engineering application value.Sculpture supporting structure is a special application of high-rise structures.Compared to other kind of structures,high-rise structures is characterized with height,light weight.flexible and slenderness.It has been widely used in some related fields such as power transmission,communication,broadcasting and television system.Along with the development of science and technology,structure has been designed to be much higher,lighter and slender.Due to its geometric features,the dominating load of high-rise structure is wind.As the height of high-rise building increases continuously,the shape of buildings become more and more complex,and light weight and high strength building materials are used widely,which bring out more difficulty in the design of wind resistance.Wind induced response of tall building has been thoroughly investigated,however there is little investigations on the wind induced response of high-rise structures with complex shape.Based on the statue of Hercules project,the structure design,the wind load calculation method,and the diaphragm effect of the surface skin of high-rise structures with complex shape are studied.The finite element model of the statue of Hercules was developed using SAP2000.Dead load,live load,wind load,and earthquake action were considered in the model.Based on the analysis of the internal force and the deformation of the structure,a proper structures scheme was determined.Then the numerical wind tunnel simulation analysis was carried out on the statue of Hercules.Surface wind pressure was obtained in three characteristics of the wind direction(0 DHS,45 DHS and 180 DHS).The diaphragm effect of the skin of the statue to the supporting system was studied using finite element software ANSYS.Based on systematic study on the structure of the statue of Hercules,such as the loads,load combinations,wind-induced response,the diaphragm effect,the earthquake action,the structural mechanism and the arrangement of the members were optimized.An advanced structure scheme was adopt with excellent performance,which could be referred to for future similar projects.Conclusions:analysis of the structure shows that the critical load for the statue of Hercules is the horizontal wind load.By using the numerical wind tunnel simulation,the flow field and velocity vector diagram were obtained,and the flow separation,reattachment,surrounded by a series of flow around a bluff body phenomenon were precisely predicted,which is even difficult to obtained in wind tunnel test.The research can provide meaningful information for the investigation on the wind environment.In this paper,the finite element model of the skin of the statue of Hercules was established by the finite element software.The stress analysis was carried out considering the effect of wind load and earthquake action.The analysis shows that:if the deck and the supporting the structural components is reliably connected,the deck can provide continuous lateral supports for the structural components which will improve the stability of these components,and the overall stiffness of structure.