NEXT梁桥加速施工的剪切活载分析

Pub Date : 2021-12-09 DOI:10.3233/brs-210191
Jianwei Huang
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引用次数: 1

摘要

在桥梁结构中使用预制混凝土构件已成为提高桥梁可持续性的一种经济耐用的解决方案。预制/预应力混凝土研究所(PCI)最近开发了东北端T形梁,用于加速桥梁施工。到目前为止,已经报道了几项关于NEXT F梁桥弯矩活载分布因子(LLDF)的研究。然而,NEXT F梁桥中剪切的LLDF仍然不清楚。本文通过全面的参数研究,对NEXT F梁桥的活载剪切横向分布进行了研究。本研究涵盖的参数包括桥梁截面、跨度长度、梁截面、梁数量和荷载车道数量。采用经过验证的有限元(FE)建模技术来分析NEXT F梁桥在AASHTO HL-93荷载下的剪切行为,并确定NEXT梁桥中剪切的LLDF。针对NEXT梁桥,提出了一种计算剪力FE-LLDF的方法。该研究的结果表明,FE LLDF与AASHTO LFRD LLDF具有相似的趋势。然而,据观察,一些LRFD LLDF比FE LLDF低14.1%,这意味着使用LRFD LLDFs进行剪切可能会导致NEXT梁桥的剪切设计不安全。为了结构安全和设计简单,建议将1.2的系数应用于NEXT F梁桥中的LRFD-LLDF剪力。
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Shear live load analysis of NEXT beam bridges for accelerated bridge construction
Using precast concrete elements in bridge structures has emerged as an economic and durable solution to enhance the sustainability of bridges. The northeast extreme tee (NEXT) beams were recently developed for accelerated bridge construction by the Precast/Prestressed Concrete Institute (PCI). To date, several studies on the live load distribution factor (LLDF) for moment in NEXT F beam bridges have been reported. However, the LLDFs for shear in NEXT F beam bridges are still unclear. In this paper, the lateral distributions of live load shear in NEXT F beam bridges were examined through a comprehensive parametric study. The parameters covered in this study included bridge section, span length, beam section, number of beams, and number of lanes loaded. A validated finite element (FE) modeling technique was employed to analyze the shear behavior of NEXT F beam bridges under the AASHTO HL-93 loading and to determine the LLDFs for shear in NEXT beam bridges. A method for computing the FE-LLDF for shear was proposed for NEXT beam bridges. Results from this study showed that the FE-LLDFs have a similar trend as the AASHTO LFRD-LLDFs. However, it was observed that some LRFD-LLDFs are lower than the FE-LLDFs by up to 14.1%, which implied using the LRFD-LLDFs for shear could result in an unsafe shear design for NEXT beam bridges. It is recommended that a factor of 1.2 be applied to the LRFD-LLDF for shear in NEXT F beam bridges for structural safety and design simplicity.
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