孟思博¹，丁 阳^1,2
AuthorsHTML:孟思博¹，丁 阳^1,2
AuthorsListE:Meng Sibo¹，Ding Yang ^1，2
AuthorsHTMLE:Meng Sibo¹，Ding Yang ^1，2
Unit:1. 天津大学建筑工程学院，天津 300350；
2. 天津大学滨海土木工程结构与安全教育部重点实验室，天津 300350
Unit_EngLish:1. School of Civil Engineering，Tianjin University，Tianjin 300350，China；
2. Key Laboratory of Coast Civil Structure and Safety of Ministry of Education(Tianjin University)，Tianjin 300350，China
Abstract_Chinese:大跨度跨海桥梁会同时遭受风和波浪等复杂环境激励作用，需要在生命周期内考虑其安全性，首要问题是进行正确的随机风和波浪模拟．为同时考虑风浪相关性、风浪非平稳特性和风速空间相干性，首先，本文基于风浪联合功率谱模型，采用谐波合成法和演化谱理论建立了随机非平稳风浪同步模拟方法；然后，采用所建方法，针对某大跨度桥梁进行了随机非平稳风浪同步模拟，给出了桥梁关键位置风速和波高时程样本，对比了模拟谱和目标谱，验证了所建方法的正确性；最后，针对此大跨度桥梁进行了风浪联合作用下的动力响应分析，比较了传统方法和本文方法得出的桥梁关键位置抖振力和波浪力，并对比了两种方法的位移结果．研究表明：本文方法可以同时考虑风浪相关性、风浪非平稳特性和风速空间相干性，实现随机非平稳风浪同步模拟，且具有良好的模拟精度；当随机模拟数组取值相同时，风浪相关性对风速和波高时程样本的影响与模拟点距离有关，总体上看，其对风速时程样本影响较小，对波高时程样本影响较大，进而对桥塔水下结构横向位移影响显著，所分析工况下变化率绝对值极值可达71.0%；风浪非平稳特性对桥梁水上和水下结构响应的影响均十分显著，因此进行随机非平稳风浪同步模拟具有合理性和必要性．
Abstract_English:Large-span coastal bridges are subject to complex environmental systems，such as wind and waves. Thus，safety during their life cycle needs to be considered. The primary challenge is conducting reasonable and detailed wind and wave field simulations. In this work，to study the wind-wave correlation，nonstationary process and spatial coherence of the wind speed based on the wind-wave joint power spectrum model，the weighted amplitude wave superposition method and evolutionary spectrum theory are used to achieve the synchronous simulation of random nonstationary wind and waves. Further，the synchronous simulation of random nonstationary wind and waves is conducted for the large-span coastal bridge using this method. The wind speed and wave height time history samples of the bridge are reported. The simulated and target spectra are compared to verify the correctness of the proposed method. Finally，the dynamic response analysis of a large-span coastal bridge subjected to wind and waves is conducted. The buffeting and wave forces of the bridge and the displacement rates obtained by the traditional and proposed methods are compared. The results show that the proposed method can simultaneously report the nonstationary characteristics of the wind and waves，the spatial coherence of wind speed，and the wind-waves correlation with good simulation accuracy. When the simulated random array has the same value，the influence of wind-wave correlation on the wave height time history samples is considerable. Further，the wind-wave correlation has a considerable influence on the lateral displacement of the underwater structure of the pylon；the maximum rate of displacement is 71.0%. The nonstationary process also affects the response of the bridge. Therefore，it is practical and necessary to conduct the synchronous simulation of random nonstationary wind and wave fields.
Keyword_Chinese:跨海桥梁；随机风浪；谐波合成法；非平稳过程；风浪相关性
Keywords_English:coastal bridges；random wind and waves；weighted amplitude wave superposition(WAWS)method；nonstationary process；wind-wave correlation

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