Stress Analysis Of CFST Tied Arch Bridge Arch Foot128Meters

Previous research on the basis of reading achievement, taking Urumqi river largetied-arch bridge as the background, based on the analysis of the tied-arch bridge’s arch andbeam in the construction process of stress, the main work are as follows:(1) By introducing the development of concrete filled steel tube in China, especially thedevelopment of transport infrastructure in recent years, increasing the construction of tiedarch bridge, not only to adapt to the development of city and society, but also providesreliable data and experience of tied arch bridge to us. Secondly, a detailed description of thetype of tied arch bridge, based on construction of tied arch bridge, illustrates the importanceof the local stress analysis of arch foot.(2) By using the large finite element software midas/fea, combined with the actualestablishment of the Urumqi river through the entity type tied arch bridge model. In theestablishment of tied arch bridge model, the arch rib of the steel concrete and tie beamrespectively with solid beam element, plate element simulation for steel tube, simulation onlytension rod truss element, simulate the prestressed steel strand wire unit, to simulate thespring unit full framing support beam, when division grid will be the arch foot and abutmentand the grid system, the ends of the beam into relatively small.(3) Comparison and analysis of field measured data and simulated data. The scene of thekey sections of the beam stress monitoring and collecting data and software of finite elementanalysis results are compared and analyzed, to ensure that the tied arch bridge of beam inconstruction process in different construction stages of stress and linear to meet the designrequirements. Secondly, analysis of arch foot in each construction stage of stress change,obtained in the construction process of arch foot stress condition, namely the arch foot shouldreach after finished the second batch of prestressed force in a maximum value, since thesuspender tension, stress at arch feet decreases, the full support of demolition, tie the arch ofthe system changes, but at arch feet stress did not change greatly. In this paper,128meters oftied arch bridge in the construction process of beam end edge of anchorage zone of webs ofprestressed anchorage zone and the web is in compression at the top of the tensile stress instress state, the middle part of the web in anchorage zone and lower arch rib and arch footbelow the crossings of round chamfer. On the existence of tensile stress big spot, suggestedanti-cracking measures in the construction and design. Through this research put forwardeffective suggestions for construction.