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首页> 外文期刊>Journal of bridge engineering >Live Load Distribution Factors for Moment in NEXT Beam Bridges
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Live Load Distribution Factors for Moment in NEXT Beam Bridges

机译：NEXT梁桥弯矩的活荷载分配系数

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In recent years, northeast extreme tee (NEXT) beam bridges have gained increased attention in the bridge industry for their ease of construction. When designing a NEXT beam bridge, the actual live load moment in a beam stem can exceed the design stem moment (i.e., half of the design beam moment) because of the uneven stem spacing. Current guidelines conservatively use the average stem spacing to compute the live load distribution factor (LLDFs) per lane for moment for each stem, which is doubled to calculate the LLDFs for the entire NEXT beam. In this regard, this study aimed to evaluate the applicability of the current LRFD method for LLDFs per lane for moment to the NEXT beam bridges by employing validated finite-element (FE) simulations. Parametric studies were carried out by both simplified and detailed FE modeling of various bridges with minimum- and maximum-width NEXT beams to compute the FE LLDFs. By using the beam spacing and the properties of an entire NEXT beam section, the LRFD LLDFs for NEXT beam bridges were computed as LRFD types i, k, and h sections. The results of FE and LRFD LLDFs were compared, and results showed that LRFD LLDFs governed the FE LLDFs by at least 12%. In addition, it was observed that the LRFD types i and k sections were more applicable for NEXT beam bridges compared with the LRFD type h section. (C) 2017 American Society of Civil Engineers.
机译：近年来，东北极三通（NEXT）梁桥因其易于施工而受到了越来越多的关注。在设计NEXT梁桥时，由于杆间距不均匀，梁杆中的实际活荷载力矩可能会超过设计杆力矩（即设计梁力矩的一半）。当前的指南保守地使用平均杆间距来计算每个车道每个弯矩在每个车道上的活荷载分布系数（LLDF），将其加倍以计算整个NEXT梁的LLDF。在这方面，本研究旨在通过验证有限元（FE）仿真评估当前LRFD方法对每个车道的LLDF弯矩对NEXT梁桥的适用性。通过对具有最小和最大宽度NEXT光束的各种桥梁的简化和详细有限元建模进行参数研究，以计算有限元LLDF。通过使用光束间距和整个NEXT光束截面的特性，将用于NEXT光束桥的LRFD LLDF计算为LRFD类型i，k和h。比较了FE和LRFD LLDF的结果，结果表明LRFD LLDF支配FE LLDF至少12％。另外，观察到，与LRFD的h型截面相比，LRFD的i型和k型截面更适用于NEXT梁桥。 （C）2017年美国土木工程师学会。

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