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Site-Specific Adaptive Resistance Factor Calibrations of Axially Loaded Driven Piles

机译：轴向装载的驱动桩的站点特定自适应电阻因子校准

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Resistance factors of the conventional load and resistance factor design (LRFD) are calibrated from reliability analyses using the load and resistance distributions. In pile design practices, proof pile load tests are conducted to verify the pile designs. Typically, proof pile load tests are performed until an axial load on the pile head reaches twice its design load. Considering that the piles are usually designed with factors of safety higher than 2.0 (typically, 3.0), pile failures are rarely observed during proof pile load tests. When installation of a large number of piles is scheduled within a certain site, at least several proof pile load tests are required. For a given certain site, the proof pile load test results, indicating how many failures observed out of the total number of proof pile load tests, can be regarded as valuable information reflecting the site characteristics. This information can be quantified by a certain equation, which is a likelihood function. Bayesian theory for the obtained likelihood function enables updates of the conventional resistance factors. Based on the pile load test database collected from Korea sites, the site-specific adaptive resistance factors calculated from Bayesian theory implementation varied within wide ranges of 0.27 to 0.96 and 0.19 to 0.68 for target reliability indices of 2.33 and 3.0, respectively, depending on the proof pile load test results.
机译：传统的负载和阻力系数设计（LRFD）的电阻因子从使用负载和电阻分布可靠性分析校准。在绒头设计实践中，进行了证明桩负载测试以验证桩设计。通常，进行证明桩负载测试，直到桩头上的轴向载荷达到其设计负荷的两倍。考虑到桩通常设计具有高于2.0（通常，3.0）的安全因素，在证明桩负载测试期间很少观察到桩故障。当在某个站点内安排大量桩的安装时，至少需要若干证据桩负载测试。对于给定的某些网站，证明桩负载测试结果，表明在证据桩负载测试总数中观察到的故障可能被视为反映现场特征的有价值的信息。该信息可以通过某个方程量化，这是一个似然函数。贝叶斯理论为获得的似然函数实现了传统阻力因子的更新。基于从韩国站点收集的桩载试验数据库，由于2.33和3.0的目标可靠性指数，从贝叶斯理论实施计算的特定特定的自适应电阻因子在0.27至0.96和0.19至0.68的范围内，分别取决于2.33和3.0的目标可靠性指数。证明桩负荷测试结果。

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