As more private firms participate in public projects aiming to increase their profits by adjusting operational strategies, there has been an increasing demand for structural identification in the operational phase. In this paper, we propose a framework for finding the optimal profit of toll highways over a 5-year part of the operating period. Toll rates are adjusted using the updated safety condition of highway bridges as a constraint on the optimization task. The safety constraint explicitly reflects the requirement on the traffic volume based on the reserve capacity of bridges. The framework includes the following three steps. First, structural identification is carried out to identify parameter values of the bridge involved in the highway project. Then the reserve capacity under the relevant limit state is calculated based on the requirements of bridge design codes. The last step is to investigate the effects of reserve capacity on the optimal operating profit. This framework is applied to a highway flyover project in Singapore. The optimal operating profit based on quantified reserve capacity increases compared to the case without information about reserve capacity. Also, the finding shows that the optimal profit will increase with the increases in values for the reserve capacity until the safety constraint is no longer critical.

中文翻译：

---

利用更新的桥梁结构能力优化年轻公路的运营利润

随着越来越多的私营公司参与旨在通过调整运营策略来增加利润的公共项目，在运营阶段对结构识别的需求也越来越大。在本文中，我们提出了一个框架，用于寻找运营期5年内收费公路的最佳利润。使用更新的公路桥梁安全状况作为优化任务的约束条件来调整通行费。安全约束明确地反映了基于桥梁的保留容量对交通量的要求。该框架包括以下三个步骤。首先，进行结构识别以识别参与公路项目的桥梁的参数值。然后根据桥梁设计规范的要求，计算相关极限状态下的备用能力。最后一步是研究储备容量对最佳经营利润的影响。该框架适用于新加坡的高速公路立交桥项目。与没有储备能力信息的情况相比，基于量化储备能力的最佳运营利润增加了。同样，该发现表明，最优利润将随着备用容量的值的增加而增加，直到安全约束不再至关重要为止。与没有储备能力信息的情况相比，基于量化储备能力的最佳运营利润增加了。同样，该发现表明，最优利润将随着备用容量的值的增加而增加，直到安全约束不再关键为止。与没有储备能力信息的情况相比，基于量化储备能力的最佳运营利润增加了。同样，该发现表明，最优利润将随着备用容量的值的增加而增加，直到安全约束不再关键为止。