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以对某跨海重轨桥梁的桥型论证为背景,着眼于重载和海域环境两个特点,从桥梁概念性设计的角度论述了整体式桥梁下部结构、箱梁式桥梁上部结构、桥梁经济跨径、桥梁预应力体系四个方面的内容。然后,经过数值计算,验证了方案体系总体刚度能满足要求。论文最后,为更科学地确定桥梁标高,对跨海桥梁承受波浪荷载进行了初步探讨,同时提出了下一阶段应进行人工岛和港口防波堤对桥位的掩护作用分析的必要性。
Taking the bridge type demonstration of a trans-sea heavy rail bridge as the background and focusing on the two characteristics of overloading and marine environment, this paper discusses the integral structure of the lower part of the bridge, the upper structure of the box-girder bridge and the bridge economy from the conceptual design of the bridge Span, bridge prestressed system of four aspects. Then, after numerical calculation, it is verified that the overall stiffness of the scheme system can meet the requirements. Finally, in order to determine the bridge elevation more scientifically, the wave load on the bridge across the sea is discussed in the first place, and the necessity of the analysis of the protective effect of the artificial island and the breakwater on the bridge site in the next stage is also proposed.