Fundamental concepts of the developed site load-factor approach for the assessment of existing bridges are introduced in this contribution. The method is complemented by the calibration of the partial factors accounting for uncertainties. The calibration is crucial for the simple application of the method in concordance with semi-probabilistic approaches commonly presented in design guidelines. As means of verification of the proposed methodology, a reliability analysis of the site load factor approach is offered to assure that the intended safety level required by codes is achieved. Results indicate that reductions of the static load effects mandated by design stipulations can be implemented, while maintaining the required safety levels. The methodology presented here is developed in the context of data collected in South Africa, nevertheless the framework is general and can be extrapolated to any other country or dataset.

在此文稿中介绍了用于评估现有桥梁的已开发场地荷载因子方法的基本概念。该方法通过考虑不确定性的局部因素的校准得到补充。校准对于根据设计指南中通常介绍的半概率方法对方法的简单应用至关重要。作为验证所提出方法的手段，提供了现场负荷系数法的可靠性分析，以确保达到规范要求的预期安全水平。结果表明，在保持所需安全等级的同时，可以减少设计规定所要求的静载荷效应。本文介绍的方法是根据南非收集的数据开发的，