基于外环境变化下高桩码头的水平承载力不足及补强研究

On the insufficient horizontal bearing force of high-piled wharf and reinforcement method under the changing external environment

高桩码头由于自身结构特点,对于荷载变化的适应能力较弱,尤其对于大批设计建造年代较早的高桩码头,比较容易发生破损现象。现场检测结果表明,高桩码头承受的过大水平力是导致码头结构破损的主要原因,结构破损的主要表现形式为叉桩破坏。建立了高桩码头的有限元模型,通过正交分析和敏感度分析的方法得到叉桩最不利受力工况,对叉桩的受力机理和破损形态进行了深入研究,从而奠定了补强高桩码头水平力不足的基础。对于补强加固叉桩的研究是通过分别加固桩帽和基桩本身两个方面来进行,研究结果表明外包加固桩帽只有修复作用,而加固基桩本身方有补强的效果。研究结果对维修和加固高桩码头叉桩具有较强的参考价值。

It is popular that many high-piled wharves are damaged by overloading of the horizontal,especially for the wharves which have been used for a long period.The main representation is the damage of forked piles which are mainly used for supplying the horizontal force.Establishing a finite element numerical model,we got the worst force scenarios of the forked piles by the perpendicular and sensitivity analysis.Two methods of forked piles reinforcement,pile-cap reinforcement and pile reinforcement,are introduced respectively.