Designing Parameter Optimization Of Simply Supported CFST Beam-arch Association Bridge

Beam Arch Combined Bridge combines general arch girder bridge and characteristics under load role in the formation of the various system components to work together, not only reasonable force structure, beautiful appearance, but also to overcome the traditional arch thrust of the foundation for high shortcomings and become a highly competitive class bridge type, widely used in bridge construction. But theoretical study of the bridge girder and arch combination system is far behind the engineering practice, the theoretical system is not perfect, there is a deficiency in the design optimization. So the research simply supported steel concrete beam bridge arch combination system design parameter optimization is a certain sense. The main contents of this article include:①Using the finite element software Midas Civil build Qionghai Jiuqujiang bridge finite element model for structural static and dynamic calculation, the construction phase and monitoring of key sections calculated stress comparing the measured value of construction, built to verify the reasonableness of the finite element model analyze the situation by force into the structure of the bridge stage, and by the natural frequencies and mode shapes of the computational analysis of the dynamic characteristics of the structure②Explain the principles of the arch axis optimization analysis and finite element model of combining theoretical calculations and the use of this method were Jiuqujiang bridge arch axis optimization, weakened Rib peak moment, making the moment more evenly distributed, effectively improve a rib stress condition.③Span ratio, arch beam stiffness ratio, boom affect the structural rigidity of both static and dynamic characteristics of the important design parameters were taken multiple parameter values, computing architecture in dead load, live load, temperature loads and internal forces deflection and natural frequencies and vibration analysis type structure, summarizing the design parameters for static and dynamic characteristics of the law at the same time, given a reasonable range of values, provide a reference for the design of the bridge system.④Describes rigid support continuous optimization principle balance method and beam method, the force of the rigid boom law, and the use of three methods to bridge suspender force optimization, improve the structure of the bridge into force state, by contrast optimized Bridge boom, structural displacement and bridge moment, the effect of three methods of analysis and optimization.⑤Describes the method and dress split down the principle of iterative method to calculate and apply forward iteration method to calculate River Bridge construction boom nine tensile force, so that the boom in place once the tension and avoid late complex search process tune; use tension key way to improve boom Rib Concrete pumping stress condition during the steel arch, to calculate the appropriate suspenders Tension dichotomy principle by using the finite element software, effectively reducing stress during the construction and steel arch deformation.