The Construction Optimality And Stability Analysis Of The Concrete Arch Bridge With Stiff Skeleton

The concrete arch bridge with stiff skeleton has the merits both of the CFST arch bridge and the concrete arch bridge. Especially, the self-spanning system during the construction brings much convenience. It brings a good choice for building arch bridge with larger span for the actualization of frog-leaping development.This paper presents a review the history and present state of the steel reinforced concrete, summarizes the present research condition on the steel reinforced concrete, Contrasts the design codes between different countries, expounds the steel reinforced concrete especially the concrete arch bridge with stiff skeleton using in the bridges, introduces the concept and classification of the stability in the arch bridge, also generalizes the research state on the concrete arch bridge with stiff skeleton.The paper introduces the basic concept and theory of the in-plane buckling and the lateral buckling which are the two instability forms in the arch bridge, also the critical load formulas in different types of arch. The finite element method using in the arch bridge stability is introduced briefly.Considering the physical circumstances of the Tian-gong Bridge as well as the construction ability of the bridge construction corporation, the main arch's construction project, the side arch's full framing, and the main arch's section are optimized. This leads to an obvious saving in the construction cost, an enhancement of the construction reliability and the increase of safety of the main arch during the construction. Much practicability and economy is achieved after optimization, as proved by the engineering practice.A computational modal using 3-D solid element is established basing on the Tian-gong Bridge with ANSYS. The paper explores how to choose the element type, how to deal with the concrete arch bridge section with stiff skeleton, how to mesh the modal, how to simplifies the structure into the finite element and how to implement the prestress. It is shown that the bridge satisfies the Code on the issue of stability during the construction, basing on the results got from the calculation and analysis of the modal above. The wind load, false stull, longitudinal prestress, and the transverse prestress's function are analyzed and some conclusions are drawn, which can be referenced for the Tian-gong Bridge.