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本文以衡阳市船山东路耒水二桥PC桥梁为实例,从耐久性极限状态的原理出发,提出了耐久性极限状态表达的内容,将PC桥梁结构耐久性极限状态划分为三类,分析了PC桥梁在腐蚀环境下,相对应的预应力钢筋初锈、预应力桥梁普通钢筋锈胀、预应力结构受力开裂极限状态方程形式,给出目标可靠指标建议值。本文的研究能为预应力桥梁结构正常安全使用以及桥梁耐久性设计、评定提供理论依据和实践参考。
Taking PC bridge of Huangshui No.2 bridge in Hengyang Shiping East Road as an example, this paper presents the content of durability limit state based on the principle of durability limit state, and divides the durability limit state of PC bridge structure into three categories. PC bridge under corrosive environment, the corresponding initial stress of prestressed steel, prestressed bridge ordinary steel rust expansion, stress cracking state equation of the prestressed structure form, give the target value of reliable indicators. The research in this paper can provide theoretical basis and practical reference for the normal and safe use of prestressed bridge structures and the design and assessment of bridge durability.