中文摘要：

为合理适度地利用亚健康公路梁式桥的通行能力，引入了亚健康公路梁式桥的使用承载能力的概念，基于工程可靠度的分析方法，结合实际现役亚健康公路梁式桥的外观检查、荷载试验及有限元分析结果，以混凝土梁式桥的裂缝宽度作为广义抗力，综合考虑了运营荷载、钢筋锈蚀等随机因素，探讨了亚健康公路混凝土桥梁使用承载能力的可靠度分析方法，结合工程实例提出了亚健康桥梁的限载方法，为现役亚健康公路桥梁的科学限载及合理使用提供了理论依据。

英文摘要：

In order to make use of the load-carrying capacity reasonably and moderately, the concept of serviceability bearing capacity is introduced in this paper. Based on the reliability analysis method, combing the result of appearance investment of existing highway sub-health bridge with load test and FE analysis, further, consider random factors such as carrying load and corrosion of reinforcement, take the crack width of concrete beam as generalized resistance force, the reliability analysis method of the serviceability capacity of sub-health highway concrete beam bridge is discussed, and the corresponding vehicular load limit method is put forward. The research result of this paper can be used to provide the academic reference for reasonable and scientific usage of sub-health highway bridges.