Premature failure of bridge components, caused by heavy trucks, is a major safety concern. Current studies well characterize the integral structural behavior of bridges under realistic stochastic traffic loading. However, there is little research on the differences in traffic loads over multiple lanes (a worldwide traffic phenomenon) and the resulting difference in the bridge component performance. In this paper, several sets of unidirectional two‐lane, three‐lane, and four‐lane weigh‐in‐motion data are available for the statistical evaluation of typical multigirder concrete bridges with structural types of slab beams, T‐shape beams, and box beams. Lane‐occurrence behavior, volume, load, and weight correlation of trucks are determined to have the largest impact on failure probability. Extreme and equivalent load effects (LEs) under multilane truck loading are calculated to assess bearing capacity and fatigue performance. The greater the number of lanes, the larger the discrepancies of truck volume and weight by lane. The differences in the traffic LE and reliability indices for each girder in the same bridge increase with greater number of lanes, shorter span, and weaker lateral girder connection. These results provide the background of designing or maintaining the bridges to pursue uniform target reliability of each girder component under realistic multilane truck loading.

中文翻译：

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多梁桥多车桥载重不均对部件可靠性的影响

由重型卡车引起的桥梁组件过早失效是一个主要的安全隐患。当前的研究很好地描述了在现实的随机交通荷载下桥梁的整体结构行为。但是，关于多车道交通负荷差异（全球交通现象）以及由此产生的桥梁部件性能差异的研究很少。在本文中，几组单向两车道，三车道和四车道的运动中称量数据可用于对结构类型为平板梁，T形梁和薄板梁的典型多梁混凝土桥梁进行统计评估。箱梁。确定卡车的车道发生行为，体积，负载和重量相关性对故障概率具有最大的影响。计算多车卡车载荷下的极限载荷和等效载荷效应（LE），以评估轴承能力和疲劳性能。车道数量越多，卡车按车道的体积和重量的差异就越大。随着车道数量的增加，跨度的缩短以及横梁连接性的降低，同一座桥中每个大梁的交通LE和可靠性指标之间的差异会增加。这些结果为设计或维护桥梁以在实际的多车道卡车载荷下追求每个大梁部件的统一目标可靠性提供了背景。随着车道数量的增加，跨度的缩短以及横梁连接性的降低，同一座桥中每个大梁的交通LE和可靠性指标之间的差异会增加。这些结果为设计或维护桥梁以在实际的多车道卡车载荷下追求每个大梁部件的统一目标可靠性提供了背景。同一车道中每个梁的交通LE和可靠性指标之间的差异会随着车道数量的增加，跨度的缩短以及横向梁连接的减弱而增加。这些结果为设计或维护桥梁以在实际的多车道卡车载荷下追求每个大梁部件的统一目标可靠性提供了背景。