韩国桥梁设计规范规定的重力荷载-极限状态最优荷载阻力系数的确定,KSCE Journal of Civil Engineering

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韩国桥梁设计规范规定的重力荷载-极限状态最优荷载阻力系数的确定
KSCE Journal of Civil Engineering ( IF 1.9 ) Pub Date : 2019-07-12 , DOI: 10.1007/s12205-019-1245-1
Hae Sung Lee , Sang Won Song , Ji Hyeon Kim

本文提出了一种优化方案，用于确定《韩国公路桥梁设计规范》中重力载荷控制的极限状态的最佳载荷阻力系数。将极限状态函数中的随机变量归一化为总额定载荷效应，并使用归一化变量来制定优化。目标函数定义为 L ₂-由载荷抗力因子获得的设计强度与目标可靠性指标的逆可靠性分析所评估的目标强度之间的误差范数。提出了两种不同类型的优化：参考优化和顺序优化。前者是为了确定绝对的最佳负载抵抗系数，而后者是为了获得适合实际设计规范的因素而提出的。参考优化产生的负载阻力因子比顺序优化产生更均匀的可靠性指标。详细介绍了拟议的载荷抵抗系数所提供的可靠性等级，并将其与《韩国公路桥梁设计规范》中所获得的可靠性等级进行了比较。

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Determination of Optimal Load-Resistance Factors for Gravitational Loads-Governed Limit State of Korean Bridge Design Code

This paper presents an optimization scheme to determine the optimal load-resistance factors for a gravitational loads-governed limit state in the Korean Highway Bridge Design Code. The random variables in the limit state function are normalized to the total nominal load effect, and the optimization is formulated using the normalized variables. The objective function is defined as an L ₂-norm of errors between the design strength obtained by the load-resistance factors and the target strength evaluated by the inverse reliability analysis for the target reliability index. Two different types of optimization, reference and sequential optimizations, are proposed. The former is to determine absolute optimal load-resistance factors, while the latter is proposed to obtain the factors suitable for actual design codes. The reference optimization results in load-resistance factors that yield a more uniform reliability index than the sequential optimization. The reliability levels provided by the proposed load-resistance factors are presented in detail and compared with those obtained by the factors in the Korean Highway Bridge Design Code. It is shown that the factors in the code lead to a much higher reliability index than the target while the optimal load-resistance factors yield a reliability index within ± 5% error bounds to the target reliability index.

更新日期：2019-07-12

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