Numerical Study Of The Dynamic Responses Of A Bridge Tower Under Wind And Wave Loads

With the rapid development of Chinese Bridges,China accounted for more than half inthe world’s top 10 bridge of cable-stayed bridge,suspension bridge,arch bridge,girder bridge.At the same time,the construction of cross-sea bridge got rapid development,whether the first cross-sea bridge Donghai Bridge was built,or the representative bridge Jiaozhou Bay Bridge and Hangzhou Bay Bridge,or the building Hong Kong-Zhuhai-Macao Bridge and proposed cross-sea corridor of the Qiongzhou strait,it suggests that bridges in China are in the stage of innovation and beyond.But Marine environment is complicated,it directly threaten the safety of the bridge in the high wind and wave loads of deep offshore environment,and even cause the instability of the structure of the bridge or partial destruction,the bridge tower is an important bearing structure of cable-stayed bridge and suspension bridge.The research emphasis of this paper is to do the dynamic response of a bridge tower under wind and wave loads,its purpose is to explore the dynamic response in the single wave,the single bridge tower and the wind and waves coupling environment,in order to strength the economy and safety of bridge construction and avoid the bridge destroyed.Firstly,Hutong bridge tower is used as the study structure of the present study.Its main span is 1092 m and design requirements to meet 4 + 6 lane highway line railway loads.Diamond-shaped pylon is applicable to against the strong wind,earthquake,or large span cable-stayed bridge.bridge tower of Hutong bridge adopts the open caisson foundation,good integrity,stability and the price is lower than pile foundation,so the paper put the bridge tower of Hutong bridge as the model.Secondly,the paper use regular wave and random wave for calculating the wave load respectively,and regular wave adopts the same wave height,calculate respectively by different period.And adopts the Jonswap spectrum in random wave,finally the data display that calculation found its displacement between the maximum and minimum of bridge tower of regular’s application,the paper mainly consider the chattering effect in wind load on structure dynamic response,calculating wind load in Davenport wind spectrum and API wind spectrum,Calculation results show that the Davenport wind spectrum of wind profile on the whole isgreater than the API.and average displacement of the bridge tower under the Davenport close to API,but the maxium is larger than API spectrum.Finally,the paper adopts the linear superposition method and Turkstra method respectively to analysis dynamic response of bridge tower structure under the action of wind and waves coupling.The calculation results show that wind load is slightly lower than a single linear superposition method.In Turkstra method,it consider two kinds of working condition,the one is considering the permanent wind and random wave superposition,the other one is permanent wave and random wind superposition.The displacement of bridge tower is greater than the linear superposition method along the bridge,the displacement of bridge tower calculated less than displacement of linear superposition method in the transverse bridge,two kinds of calculation methods have advantages and disadvantages.Relative to the wave load,wind load is bigger,the design needs to be addressed.