Reseach On The Mechanical Behavior And Stability Of Plane Beam String Structure

Pre-stressed steel structure with rationally mechanical characteristics and great prospect is attached importance by the people. Beam String Structure is new type oflong-span pre-stressed steel structure is developed recently, composed of string, strutand moment- resistant element such as beam, arch, is a self-balance with metrics of rationally mechanical characteristics, convenience of execution and transp ortation. Beam String Structure will have great prospect. Because of prestress is applied, thestiffness of Beam String Structure is strengthen greatly, size of section is diminished obviously. But the stability of the structure is no ignore.The long-span BSS is applying only just of enters in our country. There are two typical engineering, one is the passenger corridor of the Shanghai Pudong International airport that have accomplished and in use, the other is steel roof of the exhibition hall, Guangzhou International Convention& Exhibition Center is building.In this paper, based on discussing the introduce method of the prestress in cable, a new efficient method named initial strain inverse iteration method is put forward, it is analysed of form-finding of plane wide span BSS. A calculation example is done to evaluate the correct of this method.Analyses of mechanical and reflection of arch is affected by the component of BSS. It is analysed of 130m span BSS. In the course, the effect of number of struts, ratio of the height of the string and the span, ratio of the height of the arch and the span, stress of string and the span. This article gets the bound of logical parameters of plane wide span BSS. It can offer advice of this type of structure in the future.The stability of Beam String Structure can be classified two, one is local stability, and the other is global stability. The global stability includes stability in-plane and stability out-plane. In this paper, BSS is simplified to the arch with elastic sustain, divide arch flection form into symmetry and dissymmetry flection. the in-plane stability is verified by primary parameter method.The stability out of the plane is divide into lateral brace and dislateral brace in space and analyzed with the method that Germany criterion use and literature recommend. It have certain instruction meaning for the actual engineering.