Finite Element Analysis For Suspenders Static Tension Of Half Through Or Through Arch Bridge

The finite element method is the widest numerical method in engineering field. Its results have been reliable basis of design and analysis of mechanical properties of various industry products. ANSYS is large-scale finite element software, which is not only suitable widely but also powerful static and dynamic calculation function. In our country, CFST arch bridge is a new technique accompanied with bridge construction recently, which are light deadweight, high strength and high resistance to deformation. It has solved two difficult of application and erection of high strength material in arch bridge. The CFST arch bridge has being developed quickly in our country. Suspender is the most important bearing member in CFST arch bridge. Their tension not only applies in design checking computation of suspender inner force but also is external force during calculating inner force of arch rib. In common design, the calculation of suspender inner force uses the model of beam with simply supported ends, because of all kinds of restraint. In this method, all suspenders inner forces are equal. The affection of continuous bridge deck and elastic support to inner force of suspender is ignored. The task sets up calculation model of continuous beam on elastic support according to erection order of bridge deck differently, which embody reasonably load of every suspender. The calculation model of the first period dead load is beam with simply supported ends; the calculation model of the second period dead load is continuous beam on elastic support. According to different control object, the task calculates tension of suspender. The task consider geometry stiff matrix of suspenders due to adjustment of suspender length (the actual suspender length is shorter than its nominal length), and derive method and step of static tension of suspenders from single order variation. The geometry stiff matrix of suspenders doesn't be considered in common finite element analysis of this kind of bridge. Using large-scale finite element software-ANSYS, the tusk set up finite element model of continuous beam on elastic support. By calculating suspender tension of a half-through rigid skeleton CFST arch bridge, the task set up complete health file of thiskind of bridge, which provide not only basis for making comparison between results of static calculation and dynamic test, but also detail information for establishing scheme of maintenance of the bridge. Further more, this method can spread to other structure with elastic support, such as cable-stayed bridge.