钢管混凝土拱结构面内稳定性有限元分析研究-结构工程专业论文.docxVIP

AbstractWith Abstract With the development of national economics．mol屯and mbf_e wide‘span structure are built。Arch-Structure applied in many wide-span building and bridges structures， which uses less materials，has less self-weight，may spre毒d mu血more span and haS graceful appearance．Concrete fiIted steeI tube(CFST)．which iS used conveniently in construction and has hilgh carrying capacity and economic benefit，is a good composite material．Arch-Structure of CFST will be tend to applied in China for the good strfss performance of Arch-Structure and the appliance of new mat喇als． Because of the development of new structural form and the appliance of high carrying capacity materials，the structure is to be more lighter and thin wall．So it is necessary to study the buckling performance of structure．In this paper,a finite element program iS designed to analyze the stability of arch of CFST by the MArI—墟computer language．Based the practical situation of the program，the arch method is introduced to solve the nonlinear finite element equation set．Moreover the arch constraint equation is also modified，which it is explicit in physical meaning and simple in form SO that it is easy to design program．The numerical examples show that the arch method，U．L method and MATLAB computer language are the accurate method and e伍cient tool on the stability analysis of structure．The fmite element model of parabola arch is built．by ANSYS finite element software in order to testify the program accurate and gain some conclusions in construction．The result．which gained by varying the ratio of rise to span(批)，steel ratio(口)and concrete strength，shows that the global stability of arch bridge of CFST can be improved by adopting the reasonable ratio of rise to span(胆)and high strength concrete and SO on． In conclusion．the buckling analysis for Arch-Structure of CFST担of great significance in both theory and practice， Key words：Arch-Structure，concrete filled steel tube(CFST)，buckling，arch method， finite