Span Cable-stayed Bridge Static Wind Nonlinear Stability Analysis

With the increasing of Bridges' span, the stability problem of long-span Bridges in the wind loads is arousing more and more attention from scholars, static stability problem is one of them. The highway and bridge wind-resistance design standard Clearly defines as follows: cable-stayed bridge with main span more than 400m should calculate its static stability. In recent years, some scholars take some researchs on this and made certain progress.In this paper, The Yangtze River Fengdu Er Bridge is used for example. In the consolidated basis of previous work, using TDV - RM (trial) Numerical Wind Tunnel computing two-thirds coefficient of the section, using ANSYS secondary development function to form the static stability analysis procedures of cable-stayed bridge. Considering non-linear of static wind loads and structure,with the method of internal and external incremental' s iterative to solve,execute the parameter analysis of long-span cable-stayed bridge' s static wind stability.The main works are as follows:1. Reviewing and sum up the current state of static wind stability' s study comprehensively.2. Replacing section model wind tunnel test with Numerical Wind Tunnel.3. Using Ansys' s APDL to Carry on the second development and compiling the static wind stability analysis procedures.4. Analysising Fengdu Yangtze River Er Bridge' s static wind stability.5. Executing analysis on parameters which have some impact on the static wind stability of cable-stayed bridge.The analysis and conclusions of this paper have some practical significance on this bridge' s static wind stability assessment and some reference value for the same type bridge.