Comparative Analysis of Temporary Wind-resistant Measures for Long-span Cable-stayed Bridge at Construction Stage
Research purposes:The long-span cable-stayed bridge has low structural rigidity under the maximum double-cantilever construction state and is relatively sensitive to the wind-induced vibration.To study the wind-resistant measures for long-span cable-stayed bridge,the aerodynamic tri-component force coefficients of a cable-stayed bridge with 316m length of main span,located at coastal typhoons impact area,are determined with the wind-tunnel test result,and the structural wind-induced responses are analyzed with different wind-resistant measures,including temporary wind cables and temporary piers.Research conclusions:(1)Using the temporary wind cables measurement,the vertical bending fundamental frequency of the main girder is raised with 22.0％～32.5％,and the torsional fundamental frequency has no significant change;the vertical displacement of the beam and the longitudinal displacement of the pylon are relatively reduced,the fix position of the wind cable is recommended from 80％to 90％range of the maximum cantilever length.(2)The wind vibration reduction effect of the temporary pier is significantly better than that of the temporary wind cable.Using the temporary piers measurement,the maximum reduction of the vertical displacement response of the main girder is range from 53.5％to 65.5％,and the longitudinal and transverse bending moment of the main girder at the pylon position is reduced from 11.7％to 58.8％.(3)The selection of wind resistance measures should be considered with wind-resistance requirements,construction environment,construction risks and economy costs.(4)The research results can provide reference to the wind-resistance measurement selection of long-span cable-stayed bridges.
cable-stayed bridgemaximum double-cantilever construction statetemporary piertemporary wind cableswind-induced response
NETL
NSTL
万方数据
