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Calibration of foundation movements for AASHTO LRFD bridge design specifications

机译：AASHTO LRFD桥梁设计规范基础运动的校准

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摘要

In the bridge design specifications of the American Association of State Highway and Transportation Officials using the Load and Resistance Factor Design method, the loads and resulting force effects are given two-letter designations, e.g. "SE" for "force effects due to settlement". The same two-letter designation is used as a subscript to distinguish load factors, γ, to be applied to loads and other actions acting on the bridge. Thus, the load factor γ_(SE ) is used to develop factored values of the additional induced force effects such as moments and shears in a bridge structure due to foundation movements. This paper presents the process to calibrate the SE load factor as a function of the target reliability index based on structural service limit states such as cracking in a bridge superstructure. In this process, the target reliability index, uncertainty in predicted movements, and user-specified deterministic tolerable movements are considered in a unified manner. The calibration process can be used for any analytical method and any pattern of movement. The calibration process is demonstrated by an example of immediate settlement for five analytical methods using a dataset based on 20 instrumented spread footings from 10 bridges in the northeast USA.
机译：在美国国家公路和运输官员协会的桥梁设计规范中，使用负载和电阻因子设计方法，负载和产生的力量效应是双字母的指定，例如，给出两个字母的指定。 “SE”为“沉降导致的力量”。相同的双字母指定用作区分负载因子γ的下标，以应用于在桥上的负载和其他动作。因此，由于基础运动，负载因子γ_（SE）用于开发额外诱导的力效应的额外诱导力效应的因子值，例如，在桥接结构中剪切。本文介绍了基于结构维修限制状态的目标可靠性指数的函数校准SE负载因子的过程，例如桥上结构的裂缝。在该过程中，以统一的方式考虑预测运动的目标可靠性指数，预测运动中的不确定性和用户指定的确定性可容许运动。校准过程可用于任何分析方法和任何运动模式。校准过程是通过基于来自美国东北部10件桥的20个仪表展示的五个分析方法的直接结算的实际解决例来证明了校准过程。

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