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Reliability of AASHTO LRFD parameters in multilane reinforced concrete slab bridges

机译:多膜钢筋混凝土板桥中AASHTO LRFD参数的可靠性

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摘要

Empirical expressions for estimating live load bending moments are typically specified in AASHTO bridge codes. This paper will evaluate the reliability levels that are inherent in the simplified empirical equations in the AASHTO LRFD to design concrete slab bridges. Typical one-span, multilane, straight bridges, with various span lengths are modeled using finite element analysis (FEA) and subjected to AASHTO live loads. FEA results are compared with LRFD moments to quantify biases that might result from the simplifying assumptions in AASHTO. The reliability index β for bridge cases using AASHTO procedures and FEA results were quantified. The results of this analysis showed that current live load factors in AASHTO LRFD procedures were below the required levels of reliability index (β 3.5) for one-lane bridges, and those indices were higher for multilane bridges, yet did not reach the required level, thus proposing to increase the AASHTO live load factors.
机译:用于估计现场负载弯矩的经验表达式通常在AASHTO桥接码中指定。本文将评估AASHTO LRFD中简化实证方程中固有的可靠性水平,以设计混凝土板桥。使用有限元分析(FEA)建模具有各种跨度长度的典型的单跨,具有各种跨度长度,并进行AASHTO Live Loads的建模。将FEA结果与LRFD矩进行进行比较,以量化可能由简化AASHTO中的假设产生的偏差。量化了使用AASHTO程序和FEA结果的桥接箱的可靠性指数β。该分析的结果表明,AASHTO LRFD程序中的当前活载因子低于一条车道桥的可靠性指数(β<3.5)所需的可靠性指数(β<3.5),对于多程序桥的指标较高,但未达到所需的水平,因此提出增加AASHTO活载因子。

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