The Research On Multi-tower Suspension Bridge Structural Systems And Reasonable Rigidity Of Middle Towers

Different from beam bridge, arch, rigid frame bridge, cable-stayed bridge type is, relying on a strong main cable suspension bridge to carry the load, the bridge suffered by sling load transfer to the main cable, and then spread to the bridge tower foundation, so On the other structure on the bridge-very different, not only can reduce the weight load of the bridge itself, but also the strength of the material be utilized fully, so that the suspension has a greater capacity than other across the bridge type, and the multi-tower multi-span suspension bridge is between the two towers of the original suspension bridge tower two more set an even more intermediate main tower, so that the main span suspension bridge can implement multiple continuous spans across the length of the extension was greater. In this paper, the Yellow River Bridge in Yinchuan Riverfront(span arrangement: 88 + 218 + 218 + 88 = 612m) for the three-tower suspension bridge engineering background to the study, with the help of nonlinear analysis program Midas Civil, the establishment of a multi-tower multi-span self-anchored analysis model suspension bridge, its overall conduct a detailed analysis of linear and accurate research on bridge system and reasonable rigidity values in the middle of the main tower were analyzed, the main content and research work are as follows:(1) summarizes the domestic and multi-tower multi-span suspension bridge in the history of the development process, listed under construction at home and abroad and has built a bridge instances, and proposed a major multi-tower multi-span suspension bridge program, and then focuses on the Its architecture, mechanical properties, the reasonable value of the tower stiffness and problems in research.(2) Suspension expounded the theory analysis, analysis model established multi-tower multi-span suspension bridge, and by calculating the length of the main span studied increases and changes in the side spans and the ratio of the length of the bridge across the static and dynamic mechanical properties impact.(3) for multi-multi-tower self-anchored suspension stiffness across the middle of the main tower of the great impact of the suspension force characteristics were studied under the vehicle load role in the movement to take power tower stiffness stiffness different side of the tower when multiple structures features come in the middle of the main tower stiffness reasonable value, while the change in the size of the middle of the main tower stiffness values, relative height and structure in the middle of the main tower suspension bridge affect dynamic performance were studied.(4) The multi-tower suspension bridge is set central buckle, elastic cord is set in the tower, the tower is set beam movement constraints force characteristics of the structure of the case, summed up the impact of the law, and made recommendations for the design and construction.