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首页> 外文期刊>Journal of bridge engineering >Early-Age Behavior of an Adjacent Prestressed Concrete Box-Beam Bridge Containing UHPC Shear Keys with Transverse Dowels
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Early-Age Behavior of an Adjacent Prestressed Concrete Box-Beam Bridge Containing UHPC Shear Keys with Transverse Dowels

机译：带有横销的UHPC剪力键的预应力混凝土箱梁桥的早期行为

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摘要

Adjacent precast prestressed concrete box-beam bridges have been used in the United States for many years and have performed well. However, the shear keys between adjacent box beams are susceptible to cracking, which can cause reflective cracks in an overlay or composite deck. The shear-key cracks have been observed shortly after casting and have developed as a result of thermal load, shrinkage, live load, or a combination of these factors. Little research has been done to investigate the early-age field behavior of these bridges. In this study, the early-age behavior of a bridge containing partial-depth shear keys grouted with ultra-high-performance concrete (UHPC) and equally spaced dowel bars was investigated. The bridge, which is the first adjacent box-beam bridge in the United States utilizing reinforced UHPC shear keys, was instrumented and monitored. This paper presents the early-age field results of the bridge during the first week after construction. The bridge performed well, with no cracking in the shear keys based on field observations and data analysis. Furthermore, it is shown that the transverse dowels play a role in helping to carry the transverse stresses in the key at the early age, before the UHPC has gained sufficient strength. (C) 2017 American Society of Civil Engineers.
机译：相邻的预制预应力混凝土箱梁桥在美国已经使用了很多年，并且性能良好。但是，相邻箱形梁之间的剪切键容易开裂，这可能会在覆盖层或复合板中引起反射性裂缝。在铸造后不久就观察到剪切键裂纹，并且是由于热负荷，收缩，活负荷或这些因素的组合而产生的。很少有研究来调查这些桥梁的早期现场行为。在这项研究中，研究了桥梁的早期行为，该桥梁包含用超高性能混凝土（UHPC）和等间距的定位销灌浆的局部深度剪切键。这座桥是美国第一个使用增强型UHPC剪力键的相邻箱梁桥，已进行了检测和监控。本文介绍了桥梁施工后第一周的早期现场结果。根据现场观察和数据分析，该桥表现良好，剪切键没有开裂。此外，还表明，在UHPC获得足够的强度之前，横向销钉有助于在早期时承受钥匙中的横向应力。 （C）2017年美国土木工程师学会。

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