Leaning Arch Bridge On The Structure And Stability Analysis

The double X-arch bridge is a new type of arch bridges without the traditional transverse bracing. It is a complicated spatial combination system bridge of beam and arch contributed to the arch ribs comprised of the main arches and double X-arches. In the design and construction analysis of double X-arch bridge, it's crucial to ascertain the structural design parameters and the out-plane stability of the main arch together with the inclined arch. This research bases on a double X-arch bridge crossing the Xinhe River Changde city, Hunan province. The three dimensional finite element model of this bridge is developed. The main design parameters and stability of this bridge is deeply discussed. The outcomes of this research can be references to the design of double X-arch bridge. Specifically, the main work of this thesis is showed as following:1. How the key structural design parameters, such as the ratio of rise to span, the ratio of rigidity of main arch to girder, the ratio of rigidity of inclined arch to main arch, and the type of arch axis, etc. influence the internal force of the bridge is investigated when the bridge is subjected to the dead weight of structure (dead load), symmetric live load (the capacity load of vehicle loading and crowd loading) and eccentric live load respectively (the eccentric load of vehicle loading and crowd loading).2. On the basis of the circular-arch, the calculation formula of out-plane stability critical load of combined arch (main arch and inclined arch) by means of energy method. Numerical examples and parameter analysis are carried to investigate how the inclined arch affects the stability of the main arch is studied.3. Also, systematic research is performed to discuss the effect of several parameters, such as cross-brace rigidity between main arch and inclined arch, quantity and position of the cross-brace, stiffness ratio of inclined, on the stability of double X-arch. It is confirmed that the main arches are the core structural members and the inclined have a significant positive effect on the out-plane stability of the bridge, which contributes a reasonable system in terms of load mechanism and stability...