带受损浮桥的端锚式浮桥维修作业的数值建模和动态响应分析

Minghao Cui, Zhengshun Cheng, Peng Chen, T. Moan
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引用次数: 0

摘要

浮桥在其整个运行寿命期间都面临着船舶碰撞的潜在危险。在浮桥因事故而严重受损的情况下,可以使用浮动干船坞来补偿失去的浮力,并为运营提供干燥的环境。由于修复可能需要数月时间,因此首要问题是能否在不关闭道路交通的情况下在现场进行修复。本研究旨在调查使用干船坞进行维修的可行性。建立了运行中的受损桥梁的数值模型,以便与完好的端锚式桥梁进行动态对比分析。进行了特征值分析,发现摆式振荡模式的特征周期约为 15s。在各种环境条件下,通过一系列全耦合时域模拟分析了动态响应。结果表明,在受损浮桥轴线处,由于低频共振响应的激发,关于大梁弱轴的力矩标准偏差显著增加。即使波高相对较小,涌浪荷载也可能对受损桥梁产生动态放大作用。此外,研究还发现桥梁的内应力较大,尤其是在横截面的较低位置。建议在实际工程中可通过限制钟摆模式的激励或提供特殊的阻尼装置来控制响应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
NUMERICAL MODELING AND DYNAMIC RESPONSE ANALYSIS OF AN END-ANCHORED FLOATING BRIDGE WITH A DAMAGED PONTOON UNDER REPAIR OPERATION
Floating bridges face potential hazards due to ship collisions throughout their operational lifetime. In the situation where a pontoon is significantly damaged from an accident, a floating drydock may be used to compensate for the lost buoyancy and provide a dry atmosphere for operations. As the repair might take months, a primary concern is whether the repair can be in-site conducted without shutting down the road traffic. This study aims to investigate the feasibility of using a drydock for the repair. The numerical model of the in-operation damaged bridge is established for a comparative dynamic analysis with the intact end-anchored bridge. Eigenvalue analysis is conducted and pendulum modes of oscillation are found with an eigen-period of around 15s. The dynamic responses are analyzed through a series of fully coupled time-domain simulations under various environmental conditions. The results indicate that the standard deviation of the moment about the girder weak-axis increases significantly at the damaged pontoon axis due to the excitation of low-frequency resonant response. Swell wave loads might induce dynamic amplification to the damaged bridge, even with a relatively small wave height. In addition, the internal stress of the bridge girder is investigated and found to be larger, especially, at the lower locations of the cross-section. It is suggested that the responses can be managed by limiting the excitation of pendulum modes or providing special damping devices in practical engineering.
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