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以某大跨度钢-混凝土组合楼板模型为对象,采用ANSYS程序进行动力时程分析,研究人群荷载作用下,荷载布置方式、结构阻尼比、楼板边界条件、楼板长宽比和人群步行方式等因素对大跨度楼面结构振动响应的影响,分析大跨度楼板的人群动力响应特性。研究结果表明:不利布载形式为中间板带附近布置人群荷载;楼板长宽比越大则楼面结构响应峰值越小;连续步行荷载作用的楼板振动响应大于原地踏步荷载的响应;楼板边界约束越强振动响应越小;增大阻尼比能显著减小人致振动。
Taking a long-span steel-concrete composite floor model as an example, ANSYS program was used to analyze the dynamic time-history. The load distribution, load distribution, structural damping ratio, slab boundary conditions, floor aspect ratio and crowd walking mode were studied. On the long-span floor structure vibration response, analysis of large-span floor of the crowd dynamic response characteristics. The results show that: the unfavorable load is the crowd loading near the middle slab; the larger the aspect ratio of the slab is, the smaller the peak response of the slab is; the vibration response of the slab with continuous walking load is greater than that of the original tread load; The stronger the constraint is, the smaller the vibration response is; the larger the damping ratio can significantly reduce the human induced vibration.