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钢—混凝土结合梁桥具有刚度大、噪声小、建筑高度低等优点。随着客运专线、高速铁路大规模的建设,我国对钢—混凝土结合梁桥进行了试验研究,主要形式有钢板梁—混凝土结合梁桥、上承式钢桁梁—混凝土结合梁桥、下承式钢桁梁—混凝土结合梁桥、下承式系杆拱结合梁桥。通过对钢—混凝土组合技术的应用和研究,结合我国铁路桥梁工程建设,以及高速铁路、客运专线建设和既有线路提速改造,分析了不同跨度、不同结构体系的下承式钢桁梁—混凝土结合梁桥的主要结构形式,并对其受力状态及相关的设计计算理论和方法进行研究,提出进一步发展铁路钢—混凝土结合梁桥需要解决的关键技术。
The steel-concrete composite beam bridge has the advantages of high rigidity, low noise and low building height. With the large-scale construction of passenger dedicated line and high-speed railway, China has carried out experimental research on steel-concrete composite girder bridge. The main forms are steel plate girder-concrete composite girder bridge, bearing steel truss girder-concrete composite girder bridge, Steel truss girder - concrete composite beam bridge, under the tie-beam arch bridge. Through the application and research of steel-concrete combination technology, combined with the construction of railway bridge in our country, as well as the construction of high-speed railway, passenger dedicated line and speed-up transformation of existing lines, the under-span steel truss girders with different span and different structural systems Combining with the main structure forms of the beam bridge, and studying its stress state and related design calculation theory and method, the key technologies needed to be solved to further develop the railway steel-concrete composite beam bridge are proposed.