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近40年来的国际工程实践经验表明:部分预应力混凝土结构往往更为经济、合理且具有良好的使用性状。但对于在承受重型动力荷载的铁路桥梁中的应用,仍不免有所疑虑。本文对部分预应力梁的受力工作性状,疲劳、裂纹对钢筋锈蚀的影响等方面进行了探讨;并结合我国铁路40米以下跨度的预应力混凝土梁和普通钢筋混凝土梁的应用现况及存在的问题论述了在铁路桥梁中采用部分预应力混凝土梁的可能性及其现实的经济意义。
Nearly 40 years of international engineering practice shows that: some prestressed concrete structures tend to be more economical, reasonable and have good use of traits. However, there are still some doubts about the application in railway bridges under heavy dynamic loads. In this paper, some prestressed beams stress behavior, fatigue, the impact of cracks on steel corrosion and other aspects were discussed; combined with China’s railway 40 meters below the span of prestressed concrete beams and ordinary reinforced concrete beams and the application of the status quo The paper discusses the possibility of using partially prestressed concrete beams in railway bridges and their practical economic significance.