Analysis On The Mechanical Properties Of Special Form Of Curved Continuous Rigid Frame Bridge

In the case of restrictions on topography condition and roads cross network, sometimes we have to use the alien curve beam bridge. However, there is less reseach on space aliens curve stress in the wider cross-section of long span continuous rigid frame Bridges, some problems still need to be discussed and studied. This paper use Nanjing Metro Line No.3which is41+41m double wide cross-section of change curve as the engineering background of long span continuous rigid frame Bridges, and analyze the bridge’s mechanical properties by space finite element model which is built by finite element software Midas/Civil. The main work accomplished in this paper are as follows:1. Introduce the curve of the structure characteristics of long span continuous rigid frame Bridges and the structural characteristics and supporting characteristics briefly, this paper expounds the basic continuous rigid frame curve calculation theory.2. Based on variable Angle space truss theory, the paper derives the prestressed curve bending moment, shear box in complex stress state, twist the resistance to twist strength calculation formula.3. Build two subway across the wider dual variable cross-section of the curve of the continuous rigid frame bridge of model by Applicating Midas/Civil finite element analysis software, analyze it in different load conditions internal force, a reaction force and displacement, and make a comparative analysis, and sums up the alien curve of the internal force distribution of long span continuous rigid frame Bridges.4. Analyze the different structure under different load combination of the stress condition, it is concluded that the stress distribution law, find out the stress distribution of the most unfavorable position.5. On the strength of the alien structure (flexural strength, shear strength and wrest resistant strength) and resistance (is section, and the inclined section) link, determine the bending design, shear design and the control section wrest resistant design position.6. Analyze the different structure thickness D of the bottom curve of the index function, as result reasonable Suggestions and value are given; The alien structure of horizontal ring frame analysis, confirme the transverse force distribution the most unfavorable position, and give the reinforcement Suggestions.Through this paper, we study the alien for the design of the bridge, construction to provide the reference and Suggestions.