船舶撞击桥梁的理论分析与试验分析

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'船舶撞击桥梁的理论分析与试验分析'
南京航空航天大学硕士学位论文摘要目前国内外对船桥碰撞有着广泛的研究,确定船舶撞击力对桥墩的防撞设计具有重要的指 导意义。本文研究拟从理论分析入手,在简化的基础上,建立弹性碰撞模型,推导碰撞问题的 理论解系,并据此给出简化的近似计算公式。本文依托于江苏省土木工程与防灾减灾重点实验室开放项目《船舶撞击桥梁的机理分析与 试验研究》,以试验和理论相结合的方法,对船桥碰撞过程进行系统的研究,主要研究内容和结 论如下:1. 本文研究的主要是简支梁桥船撞过程,文屮对实际船桥碰撞过程屮的上部结构、桥墩、 地基基础及船舶进行了相应的简化,给出船桥碰撞理论计算简化模型。2. 从经典结构动力学分析方法出发,使用DMSM (直接模态叠加法)对理论简化模型进 行求解,得出碰撞系统的频率方程、模态、广义质量、桥墩位移响应及船撞力响应公式。3. 进行了双柱式桥墩模型的撞击试验,撞击试验桥墩1的任意位置时,桥墩1和桥墩2 同一平截面位置处加速度峰值基本一致,给岀并验证了双柱式试验墩模型简化成单柱模型这一 基本假定及试验模型与理论模型吻合度。4. 对试验墩参数进行计算并相应的带入理论公式中,得出无量纲撞击力响应时程图。由响 应图得知,越接近桥墩顶部船撞力响应峰值越大。5. 试验中得出了不同撞击位置、不同撞击速度撞击时相应的船撞力的时程曲线,通过与理 论船撞力峰值的比较,表明不同撞击位置时撞击力峰值的相刈?误差在5%左右,不同撞击速度 时峰值的误差在8%左右,试验峰值与理论峰值基本吻合,验证了理论船撞力公式的可行性。尖键词:船桥碰撞,直接模态叠加法,简化模型,等效刚度,撞击力船舶撞击桥梁的理论分析与试验研究ABSTRACTCurrently, the research about ship-bridge collision is extensive, how to determine the ship collision force has an important guiding significance to the pier impact-proof design. On the basis of the theoretical analysis, this paper gives a simplified elastic collision model, and gets the theoretical solution about collision model. Finally an approximate calculation formula is proposed?Based on the open project uthe mechanism analysis and experimental research of the ship collision with bridge二which is researched at the key laboratoiy of disaster prevention and reduction engineering? By the experiment research and theoretical analysis, this paper analyzes the ship-bridge collision process. The main contents and conclusions are as follows ?1 ? This paper studies the ship collision with a simply-supported bridge , the upper structure, pier, foundation and ship of the actual ship-bridge collision process are simplified, and the simplified calculation model of ship-bridge collision is proposed?2. From the classical point of structural dynamics, the frequency equation, modal, generalized displacement response and quality, piers boat force response of the ship-bridge collision model are solved by DMSM (use directly modal superposition method).3. The author has test on the pier model. When ship impacts piers 1 at any position,at the same cross section of pier 1 and pier 2 .the acceleration time-history curve is consisten. This test proved that the double column test pier model can be simplified into a simple columnar model.4. After the basic parameters of test pier is calculated, this paper gives the dimensionless shock response chart? According to the chart, we can know that the boat force peaks in the top are bigger than the boat peaks.in the end5. By test the boat force time-history of curve can be gotten in different impact location, different collision speed impacting, comparied with the theoretical boat force peaks, we can obtain that the relative error of collision peak is around 5% at the different impact position, and the relative error of collision peak is around 8% at different impact velocity. The peak of the theory and experiment is anastomotic, which confirmed that the formula of the boat force is feasible?Key w
关 键 词:
船舶 撞击 桥梁 理论 分析 试验
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