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美国各州公路工作者协会(AASHTO)出版的《荷载与抗力系数法规范(LFRD)》采用了基于可靠度的强度极限状态设计方法。但是,极端情况下的桥梁设计需要将非极端荷载效应与单独建立的极端荷载效应进行组合,这一过程需要专业经验判断而且安全系数难以量化。联邦公路局资助的一项研究旨在建立基于AASHTOLFRD规范的多偶然荷载抗力系数(MH-LFRD)的设计方法。本文介绍了基于可靠度分析平台,考虑极端荷载与非极端荷载的分析体系,并介绍了针对多偶然荷载的综合系数法所面临的挑战。
The Load and Resistance Factor Law (LFRD), published by the Association of State Highway Workers of the United States (AASHTO), uses a strength-of-state-based approach to reliability design. However, in extreme cases, the bridge design needs to combine the non-extreme load effect with the separately established extreme load effect, a process that requires expert judgment and the safety factor is difficult to quantify. A study funded by the Federal Highway Administration aims to establish a design methodology based on the AASHTOLFRD specification for the multi-incident load resistance coefficient (MH-LFRD). This paper presents an analysis system based on reliability analysis platform that considers extreme loads and non-extreme loads, and presents the challenges of the comprehensive coefficient approach for multi-contingency loads.