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首页> 外文期刊>Journal of bridge engineering >Effects of Temperature Distributions on Thermally Induced Behavior of UHPC Shear Key Connections of an Adjacent Precast Prestressed Concrete Box Beam Bridge
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Effects of Temperature Distributions on Thermally Induced Behavior of UHPC Shear Key Connections of an Adjacent Precast Prestressed Concrete Box Beam Bridge

机译：温度分布对邻近预制预应力混凝土箱梁桥UHPC剪力键连接的热诱导行为的影响

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摘要

Recently, there has been a rapid increase in using ultrahigh-performance concrete (UHPC) in bridge connections due to its high compressive strength, pre- and postcracking tensile strengths, superior bond, and durability characteristics. However, the behavior of field-cast UHPC connections under temperature effects is not yet fully understood. Furthermore, the temperature distribution that produces the largest thermally induced stresses in UHPC connections is unknown. In this study, the thermally induced stresses in field-cast UHPC shear key connections in an adjacent precast prestressed concrete box beam bridge were investigated using field data as well as a three-dimensional finite-element (FE) model. The FE model was validated using field data and exhibited the ability to capture the behavior of the bridge. A new temperature distribution was noticed based on the data analysis. This temperature distribution has not yet been considered by professional bridge design specifications, although it produced the largest thermally induced stresses in UHPC connections and at the beam-key interface. The observed temperature distribution should be considered in the design of UHPC shear keys for these types of bridges.
机译：近年来，由于桥梁的抗压强度高，开裂前后的抗张强度，优异的粘结性和耐用性，在桥梁连接中使用超高性能混凝土（UHPC）的数量迅速增加。但是，尚未完全了解温度影响下的现场浇铸UHPC连接的行为。此外，在UHPC连接中产生最大热应力的温度分布是未知的。在这项研究中，使用现场数据以及三维有限元（FE）模型，研究了相邻预制预应力混凝土箱梁桥中现场浇筑的UHPC剪力键连接中的热应力。有限元模型已使用现场数据进行了验证，并展现了捕获桥梁行为的能力。根据数据分析发现了新的温度分布。尽管这种温度分布会在UHPC连接和梁键界面产生最大的热应力，但尚未被专业桥梁设计规范所考虑。对于这些类型的桥梁，在设计UHPC剪力键时应考虑观察到的温度分布。

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