The Wind-induced Risk Analysis And Countermeasures Research For High-pier And Long-span Continuous Rigid Frame Bridge During Cantilever Construction Period

In recent years, with vigorous development of China's transport, high-pier and long-span continuous rigid frame bridge develops rapidly, but it often to be situated in windy strip such as in the valley or river,the problem of Construction risk under the loads of wind is prominent.This dissertation focuses on the resistant Measures of wind-induced risks of long-span rigid frame bridges, funded by Zhejiang Province Communications Department,which includes the following aspects:Firstly, The analysis theory in this part, the wind-induced risk conception and its analysis principle are discussed. Described the basic concept of wind-induced risk and the basic principles of wind-induced risk analysis, for bridge construction made of wind-induced risk factors risk analysis. Proposed method of wind-induced risk analysis for bridge construction of wind-induced risk factors.Secondly, Based on the construction wind-induced risk analysis method, reference to wind tunnel test results,double-cantilever state of maximum wind load risk analysis; At the same time using time-domain buffeting the largest double-cantilever method buffeting response, and the vibration risk assessment carried out, to get the final risk assessment results.Finally, Proposed risk response strategy and decision-making criteria, from the operational, economic, time-consuming, suppressing vibration effects in terms of possible wind Fengxian measures analysis and evaluation, for the bridge construction of wind-induced risks Duiceyanjiu in the actual project specific application and development reference.