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首页> 外文期刊>Transportation Research Record >Simplified Live Load Distribution Factor Equation for Steel Girder Bridges
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Simplified Live Load Distribution Factor Equation for Steel Girder Bridges

机译：钢梁桥的简化活荷载分配系数方程

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摘要

The "S-over" equation for load distribution factor (LDF) was first introduced in the 1930s in the AASHTO standard. Finite element studies, however, have shown it to be unsafe in some cases and too conservative in others. AASHTO LRFD 1994 introduced a new LDF equation as a result of the NCHRP12-26 project. The equation is based on parametric studies and finite element analyses. It is considered to be a good representation of bridge behavior. However, it involves a longitudinal stiffness parameter that is not initially known in design and thus requires an iterative procedure to correctly determine the LDF value. The need for an iterative design procedure is perceived by practicing engineers as the major impediment to wide acceptance of the AASHTO LRFD equation. A new, simplified equation that is based on the AASHTO LRFD formula but does not require an iterative procedure is developed. Forty-three Indiana bridges were selected and analyzed with a sophisticated finite element model. The new, simplified equation produces LDF values that are always conservative compared with those obtained from the finite element analyses and are generally greater than the LDF obtained using AASHTO LRFD specification. Therefore, the simplified equation provides a simple, yet safe specification for LDF calculation.
机译：负载分配系数（LDF）的“ S-over”方程式于1930年代首次引入AASHTO标准。但是，有限元研究表明，它在某些情况下不安全，而在另一些情况下过于保守。由于NCHRP12-26项目，AASHTO LRFD 1994引入了一个新的LDF方程。该方程基于参数研究和有限元分析。它被认为是桥梁行为的良好代表。但是，它涉及纵向刚度参数，该参数最初在设计中未知，因此需要迭代过程才能正确确定LDF值。实践的工程师认为，需要迭代设计程序，这是广泛接受AASHTO LRFD公式的主要障碍。开发了一个新的简化方程，该方程基于AASHTO LRFD公式，但不需要迭代过程。选择了43个印第安纳州的桥梁，并使用复杂的有限元模型进行了分析。新的简化方程产生的LDF值与从有限元分析获得的LDF值相比总是保守的，并且通常大于使用AASHTO LRFD规范获得的LDF。因此，简化的方程式为LDF计算提供了一个简单而又安全的规范。

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