The Property Analysis Of New Large Span Pre-stress Reinforced Arch Structure

The steel arch structure have much of excellence such as its reasonable deformation light dead load modeling elegantly and so on, it is one of the common structure form, but with the span of the structure is bigger, the stress distribution of structure of this type drive to unhomogeneous, the deformation increase rapidly, the span is limited much . For the sake of making the steel arch structure legerity and adapt to large span, the scholar of every country put forward many projects which improve the steel arch structure from increase the cables, but most of the research is focused on the cable -arch structure which no stay bar, the other improved projects are researched little. Therefore, this paper analyzed a late-model prestressed steel arch, this structure is constructed by adding some proper stay bars and pre-stress cables on inner side at center and on outer side at bottom of the arch after considering the internal force and deformation of the structure under uniform load along the full span, this structure will be called as pre-stress reinforced steel arch structure. By using the finite element analysis software ANSY the focus analyze on performance of this structure are as follows:1) Analyze mechanical property of this structure with full span nodal loads under pre-stress. Calculations show variation law of maximal stress and maximal displacement with nodal loads growing as well as initial pre-stress growing. And specially make comparison with variation law of maximal stress and maximal displacement with nodal loads growing in common steel arch structure.2) Analyze optimization effect for mechanical property of the structure by changing relative length of two-sided bracing bars. Calculations show variation law of maximal stress and maximal displacement of the structure under different full span nodal loads that relative length of two-sided bracing bars has changed.3) Analyze mechanical property of this structure under the half span nodal loads, according to the analysis, it can be improved the structure for increasing the ability of the structure resisted to the half span load. Besides, this paper analyze and research this reinforced steel arch structure that improved.Based on a general cognition of the stress characteristic of the pre-stress reinforced steel arch beam, a method which decrease the steel arch beam bending-moment and deformation by adding proper stay bars and cables on the axial plane according to it's stress characteristic is applied to single-layer latticed cylindrical shells. And a new innovational large span pre-stress spatial structure so called pre-stress reinforced single-layer latticed cylindrical shell is established in this paper. By using the finite element analysis software ANSYS, analyze the stress characteristic and elastic stabilityof the pre-stress reinforced single-layer latticed cylindrical shells has been carried out with the following aspects:1) Load calculation, internal stress analysis, member bars design and checking calculations about each worst-case bar's intensity and stability of established numeration models of the pre-stress reinforced single-layer latticed cylindrical shell have been done according to the shell designing code.2) Analysis about the stress characteristic according to various pre-stress and load value and both of them applying to the pre-stress reinforced shells under different kinds of nodal load distribution is carried out. The study reveals variation laws of internal force and deformation of the structure, and a comparison about that between this structure and single-layer latticed cylindrical shell is carried out.3) Nonlinear stable analysis on the reinforced shells is carried out, and a comparison about that between this structure and single-layer latticed cylindrical shells has been done.