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北京CBD核心区文化艺术中心东、西两楼间距36m,两楼间设置3座平面投影为Y形的大跨度复杂空间楼梯。楼梯整体刚度较柔,且受力复杂。通过弹性时程分析研究楼梯的竖向地震动加速度放大系数深入了解地震动特性,并分别采用时程分析法、振型分解反应谱法和竖向地震作用系数法比较了支座总反力,结果表明采用振型分解反应谱法对高阶振型贡献分析不充分,容易导致竖向地震作用效应偏小;竖向地震作用系数法不能区分楼梯的阻尼比、复杂程度及支座约束条件等结构动力特性的影响;而时程分析法能弥补他们的不足。楼梯设计时针对罕遇地震作用采取了有效的防跌落措施。由于大跨度复杂空间楼梯的竖向自振频率低,不能直接满足舒适度要求,在人行振动分析基础上对楼梯采用调频质量阻尼器减振技术,对人行活动的共振响应进行振动控制,提高楼梯的舒适度。
Beijing CBD core area of Cultural Arts Center East and West, the second floor of the 36m spacing between the two rooms set up three plane projection of Y-shaped long-span complex space staircase. The overall rigidity of the stairs softer, and the force complex. Through the elastic time-history analysis, the vertical ground motions of stairs are magnified to understand the characteristics of ground motions, and the total reaction force of supports is compared by time history analysis, mode decomposition reaction spectrum method and vertical seismic action coefficient method, respectively. The results show that the analysis of the contribution of high-order mode shapes is not enough by using the modal decomposition response spectrum method, and the vertical earthquake effect is liable to be small. The vertical seismic action coefficient method can not distinguish the structural dynamics such as the damping ratio, complexity and bearing constraints of the stairs Characteristics of the impact; and time-history analysis can make up for their deficiencies. Staircase designed to take an effective anti-drop measures for rare earthquakes. Due to the low vertical natural frequency of large-span complex space stairs, the comfort requirements can not be satisfied directly. Based on the pedestrian vibration analysis, the damper is tuned to the resonance of the pedestrian by using the vibration damping technology of the FM mass damper to control the vibration of the staircase Comfort.