一项工程研究发现，西雅图市正在采取紧急措施拆除46年历史的滨水公园58号码头，这是一项工程研究发现“自然力量”的恶化导致木材桩支撑的结构从相邻的海墙转移了几英寸。新利luck

西雅图公园发言人确认，一项研究建议加速堆恶化为转移的原因，并建议码头的立即拆除，该码头于8月新利luck14日由珍妮·杜坎市长批准。在2017年进行了重建的海堤，不受堆问题的影响，邻近的码头支持私人水族馆和其他旅游企业以及城市拥有的摩天轮。

码头58已经计划于2022年开始作为7.28亿美元的滨水改造的一部分，以取代现已拆除的阿拉斯加路高架桥。建于1974年，构成码头48,230平方英尺表面积的大部分的木材甲板部分主要由341个木墩支撑，这些木墩也提供了对地震，风和波浪作用的横向电阻。由混凝土填充的单管桩和钢H-Piles组合支持了两个现场露台和海墙连接。

A 2016 condition assessment by engineering consultant Seattle Structural PS Inc. noted that the loss of creosote treatment over the years had increased the piles’ vulnerability to marine borer attacks.

“Once a pile develops a large number of worm-holes, the rate of decay accelerates and the pile will eventually fail,” the study said.

西雅图Structural also found that the number of piles rated to have no more than 25% of their original 20-ton load capacity had increased from nine in 2006 to nearly 180 in 2016, and that failure of one or more piles was likely by 2021. Because the structure’s original design did not meet current seismic code requirements, the report added, continued timber decay would also increase the structure’s risk of collapse as a result of a seismic or high wind/wave event.

该研究预测，失败堆的最有可能的结果是下降和降低了活力。新利luck报告得出结论，没有任何来自车辆或大事件的大量集中载荷，因此不太可能导致单桩故障导致的崩溃。

Based on these findings, Seattle’s Parks Dept. had kept Pier 58 open, with weight restrictions and structural monitoring, pending the scheduled 2022 construction start of a replacement structure. The visual discovery of increased separation between the pier and seawall earlier this month, however, led the agency to close the structure and commission another assessment by Seattle Structural.

西雅图Structural did not respond to a request for comment.

According to a city statement, Seattle’s Office of the Waterfront and Civic Projects will enter into an emergency consultant contract to design removal of Pier 58, and work with the Seattle Dept. of Transportation to expedite permits. A cost and detailed timeline for the project is to be finalized by the end of the month.

设计of the Pier 58 replacement structure is more than half complete, according to the Parks agency. In addition to incorporating light-penetrating surfaces designed to improve the underlying marine habitat, the project will reuse elements of the existing park, including a fountain shaped in cast and welded bronze cubical elements.