落石冲击作用下钢-混凝土组合梁上砂垫层的耗能性能

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摘要为了研究落石冲击作用下钢-混凝土组合梁上覆盖砂垫层的耗能性能，进行了6根梁的模型试验和25根梁的SPH-FEM分析。试验选取混凝土圆台的落体冲击能和级配中砂垫层的厚度作为研究参数。对SPH-FEM计算结果进行统计，得到这类组合梁的冲击能量耗散与落体冲击能、垫层厚度之间的关系式。研究表明，在垫层厚度适中的情况下，垫层能量耗散效率随着落体冲击能的增大而提高。级配砂垫层厚度为1/20至1/10的梁跨度时，可以明显减小钢筋混凝土面板的最大裂缝宽度和组合梁的最大挠度。当砂土垫层厚度相同（组合梁跨度的1/40-1/8），砂土耗能与落体冲击冲击能成正相关。当落体冲击能相同时，砂土垫层耗能与砂土垫层厚度（组合梁跨度的1/40-1/8）成正相关。落体冲击能、砂土垫层厚度相互作用时对砂土垫层的能量耗散效率的影响最大。通过回归统计得到的公式可以通过不同厚度的砂土垫层和落体冲击能计算出砂土消耗的能量。

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关键词 ：钢-混凝土组合梁, 级配砂垫层, 冲击, 耗能, SPH-FEM

Abstract：In order to study the energy dissipation performance of a sand cushion on steel-concrete beam under the impact load of rockfall, six model experiments and twenty-five SPH-FEM analyses were carried out. The impact energy of the concrete frustum and the thickness of the sand cushion were selected as objective parameters. The relationships of the dissipation energy with the impact energy of the heavy weight, and the thickness of the sand cushion were obtained by SPH-FEM analyses. The study shows the energy dissipation efficiency of the sand cushion increases with the increase of impact energy of the heavy weight when the cushion thickness is moderate. The maximum crack width of the concrete surface slab and the maximum deflection of the steel-concrete composite beam can be reduced obviously when the thickness of the sand cushion is 1/20 to 1/10 of the beam span. The energy dissipated by the sand cushion is directly proportional to the impact energy of the heavy weight when the thickness of the sand cushion keeps constant(1/40—1/8 of the beam span). The energy dissipated by the sand cushion is proportional to its thickness (1/40—1/8 of the beam span) when the impact energy is unchanged. The energy dissipated by the sand cushion is largest when the impact energy and the thickness of the sand cushion interact together. 

Key words： steel-concrete composite beam sand cushion impact dissipated energy SPH-FEM

收稿日期: 2017-09-25 出版日期: 2019-03-15

引用本文:

罗杰1, 2，肖建春1, 3，马克俭1, 3，毛家意4，张弘5. 落石冲击作用下钢-混凝土组合梁上砂垫层的耗能性能[J]. 振动与冲击, 2019, 38(6): 249-256.
LUO Jie1,2 XIAO Jianchun1,3 MA Kejian1,3 MAO Jiayi4 ZHANG Hong5. Energy dissipation performance of a sand cushion on steel-concrete composite beam under the impact load of rockfall. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(6): 249-256.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I6/249

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