Eliminating Deck Joints Using Debonded Link Slabs: Research and Field Tests in Ontario
Eliminating Deck Joints Using Debonded Link Slabs: Research and Field Tests in Ontario
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DOI：
10.1061/(asce)be.1943-5592.0000417
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发表时间：
2013-07
影响因子：
3.6
通讯作者：
Alexander Au;C. Lam;J. Au;B. Tharmabala
中科院分区：
文献类型：
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作者：
Alexander Au;C. Lam;J. Au;B. Tharmabala
影响桥梁结构耐久性的主要因素之一是桥梁支承位置是否存在伸缩缝。目前的接缝系统无法提供可靠、长期、防漏的性能，通常会导致氯化物污染的水通过这些接缝早期泄漏，从而导致下面的甲板元件过早腐蚀。这一问题在老式多跨桥梁中尤其明显，这些桥梁的主梁在桥墩处简单支承，并由伸缩缝或简单铺装缝隔开。为了解决这个问题，安大略省交通部（MTO）最近对一些桥面进行了修复，使用了一种脱粘连接板系统来取代桥墩位置的桥面接缝。为了更好地了解这种新修复技术的性能和可靠性，MTO最近在实验室中进行了一项实验研究，研究了该系统在比例测试模型上的长期性能，这些模型受到了广泛的循环加载。同时，对某新近修复的结构进行了荷载试验，研究了连接板施工前后的结构性能。测试结构上装有传感器，用于测量连接板和梁的挠度和应变。本文介绍了实验研究和所进行的行为负荷试验，并对所得结果进行了讨论。试验研究表明，连接板的长期性能不受模型所承受的广泛循环荷载的影响，而试验结构的荷载试验表明，它满足加拿大公路桥梁设计规范的使用极限状态要求，从而验证了系统的设计方法。
One of the main factors affecting the durability of bridge structures is the presence of expansion joints at bridge support locations. The inability of current joint systems to provide reliable, long-term, leak-proof performance generally leads to early leakage of chloride-contaminated water through these joints, thereby causing premature corrosion in the deck elements below. This problem is particularly evident in older-type multispan bridges in which the girders are simply supported at the piers and are separated by expansion joints or simple paved-over joints. To address this problem, the Ministry of Transportation of Ontario (MTO) has recently rehabilitated a number of bridge decks using a debonded link slab system to replace the deck joints at the pier locations. To get a better understanding of the performance and reliability of this new rehabilitative technique, MTO recently carried out an experimental research study of the long-term performance of the system on scale test models that were subjected to extensive cyclic loading in the laboratory. At the same time, it carried out a load test of a recently rehabilitated structure to study its structural behavior both before and after the link slab was constructed. The test structure was instrumented with sensors that measured deflections and strains in the link slab and girders. This paper describes the experimental research study and the behavioral load tests that were carried out, and discusses the results obtained. The experimental study showed that the long-term performance of the link slab was not affected by the extensive cyclic loading to which the model was subjected, whereas the load testing of the test structure showed that it satisfied the serviceability limit state requirements of the Canadian Highway Bridge Design Code, thus validating the design methodology of the system.