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A NEW PILE-DECK CONNECTION FOR SEISMIC PERFORMANCE ENHANCEMENT OF MARGINAL WHARVES

机译：增强码头抗震性能的新型桩-板连接

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摘要

Pile-supported marginal wharves are a critical component of port infrastructure. A primary region of post-earthquake structural damage is the connection between the pile and the wharf deck. Review of prior experimental studies into state-of-the-practice connections indicates these can sustain cyclic deformation demand but at the cost of deterioration in resistance and significant damage. Damage within the connection is difficult to access and its repair is costly. Therefore, there is an interest in reducing the damage under moderate levels of seismic demand while sustaining the capacity under large cyclic drifts. An experimental study was undertaken to investigate mechanisms to limit damage while maximizing strength and deformation capacities of precast piles and their connections. Several structural concepts were investigated including (1) intentional debonding of the headed reinforcing bars, (2) supplemental rotation capacity through the addition of a cotton duck bearing pad above the head of the precast pile and (3) supplemental material to sustain the lateral deformations while minimizing deck damage. The final design incorporated all of these concepts. The results show significantly reduced damage. A design method is proposed to facilitate adoption of the proposed connection design in structural engineering practice. A comparison with other connection designs is made via fragility functions to assess their seismic performance.
机译：桩支撑的边缘码头是港口基础设施的重要组成部分。地震后结构损坏的主要区域是桩与码头甲板之间的连接。对现有技术连接状态的先前实验研究的回顾表明，这些连接可以满足周期性变形的需求，但以抵抗力下降和重大损坏为代价。连接内的损坏很难获得，其维修成本很高。因此，有兴趣减少在中等地震需求水平下的破坏，同时在大的周期性漂移下维持容量。进行了一项实验研究，以研究在最大程度发挥预制桩及其连接的强度和变形能力的同时，限制损坏的机制。研究了几种结构概念，包括（1）带头钢筋的有意剥离，（2）通过在预制桩的头部上方添加棉鸭轴承垫来增加旋转能力，以及（3）维持横向变形的补充材料同时最大程度地减少甲板伤害。最终设计纳入了所有这些概念。结果表明，损害明显减少。提出了一种设计方法，以促进在结构工程实践中采用建议的连接设计。通过脆弱性功能与其他连接设计进行比较，以评估其抗震性能。

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