ABSTRACT
The modem suspension bridge is a kind of flexible cable beam composite system, it is composed of main cable and stiffening girder, it is a very competitive bridge with large span capacity and beautiful structure model and other advantages. The main cable of suspension bridge is the main load-bearing component, it transfer the weight of stiffening girder, the two stage of dead load and live load to the main tower and foundation. The sling cable of suspension bridge is small to resist horizontal displacement effect because it is vertically arranged, when suspension bridge is under external loads, the longitudinal and transverse direction between the cable and the girder of suspension bridge will produce relative displacement, and slings will be tilted and local bending, the stress of the short slings in the center position of suspension main span is worse. In order to reduce the longitudinal expansion amount of stiffening girder, reduce the deflection of the main span, improve the bending and fatigue of the sling of the main span, the central buckle is set between the central position on the stiffening girder and the main cable[1-4]. At present, the flexible central buckle is set on the lots of suspension bridge of the large span steel truss girder, the sling of the central buckle is reliably connected with the main cable and the stiffening girder through anchorage system of the ends of the beam of the anchor box or ear plate, because the load transfer of the end the beam is complex, the effect of stress concentration
the Warren Type Structure consisting of the top and the bottom chord and vertical and oblique chord; the main transverse truss is single truss structure consisting of the upper and the lower beam, the external oblique abdominal rod, the vertical and the medial oblique abdominal rod; the bottom lateral bracing is for the system of K. The steel bridge deck system is the orthotropic steel deck structure consisting of the bridge deck, U shaped stiffening ribs, longitudinal deck ribs, bridge deck transverse beam, the bridge deck transverse ribs and I-shaped longitudinal beam.
