关键词: 桥梁工程, 重载铁路, 连续梁桥, 小阻力扣件, 适应性

Abstract: In order to reveal the influence of the layout of small resistance fasteners on the distribution of longitudi-nal force loaded on the continuously-welded rail of continuous bridge of heavy haul railway，a recognized method to analyze the rail-bridge interaction is adopted，and a spatial integrated finite element model，which takes into con-sideration the adjacent multi-span simply-supported beams，is established to describe the continuously-welded rail of a (60 +100 +60)m continuous bridge of the heavy haul railway with an axle load of 30t． Afterwards，based on the comparison of some layout plans of small-resistance fasteners，the influences of such design parameters as fas-tener resistance，substructure stiffness，loading mode and braking force ratio are discussed． The results show that(1) when small-resistance fasteners are only laid on the continuous beam，the rail stress as well as the horizontal force at pier top is rather small，and the broken seam value of the rail can be reduced at the same time; (2) the in-fluence of longitudinal resistance of small-resistance fasteners on the rail stress is up to 11． 2%; (3) when small-resistance fasteners are laid on the continuous bridge，the rapid displacement between the rail and the beam be-comes the main controlling index，and the longitudinal stiffness limit at the brake pier top of a 100m-span continu-ous bridge reaches 3000 kN/cm; and (4) both the loading mode and the braking force ratio greatly influence the displacement between the rail and the beam，so that an accurate braking force ratio should be determined by tests．

Key words: bridge engineering, heavy haul railway, continuous bridge, small-resistance fastener, adaptability