Distribution factors (DFs) for one typical cross-section as specified in the AASHTO LRFD specification can be varied when the bridge parameters such as span length, loading lanes and skew are changed. The diversity between design and actual DFs may be varied as the bridge parameters changed. To study this diversity, this paper presents an evaluation of lateral load DFs for prefabricated hollow slab bridges. The response of the bridge was recorded during the field test. This field test was divided into two stages: a concentrated force loading test on the prefabricated girder that settled on the bridge supports before the girders were connected transversely and a vehicle loading test after the girders were connected transversely. The instruments used to record the response of the bridge were strain gauges and dial indicators. The measured data in the multi-stages of the field test could be used to calibrate the support condition of the bridge and transverse connection between adjacent girders in the finite element model (FEM) using beam and plate elements. From the FEM, DFs for this hollow slab bridge were determined and compared with the DFs in the AASHTO LRFD specification. A parametric study using the calibrated FEM was then used to investigate the effect of various parameters including span length, skew and bridge deck thickness on the DFs. It was found that AASHTO LRFD specification is conservative compared with the analysis in the FEM, while this conservatism decreased as the span length and skew of the hollow slab bridge increased.

中文翻译：

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空心板桥横向荷载分布：现场试验调查

AASHTO LRFD 规范中指定的一个典型横截面的分布因子 (DF) 在跨度长度、加载车道和偏斜等桥梁参数发生变化时会发生变化。设计和实际 DF 之间的差异可能会随着桥梁参数的变化而变化。为了研究这种多样性，本文对预制空心板桥的横向荷载 DF 进行了评估。在现场测试期间记录了桥梁的响应。本次现场试验分为两个阶段：横向连接前对安装在桥梁支座上的预制梁进行集中力加载试验和横向连接后的车辆加载试验。用于记录桥梁响应的仪器是应变计和千分表。现场试验多阶段的实测数据可用于在梁板单元的有限元模型（FEM）中标定桥梁的支撑条件和相邻梁之间的横向连接。根据 FEM，确定了该空心板桥的 DF，并与 AASHTO LRFD 规范中的 DF 进行了比较。然后使用校准的 FEM 进行参数研究，以研究各种参数对 DF 的影响，包括跨度长度、倾斜度和桥面板厚度。发现与 FEM 中的分析相比，AASHTO LRFD 规范是保守的，而这种保守性随着空心板桥的跨度和斜度的增加而降低。