某长悬挑钢结构螺旋楼梯舒适度分析

Comfort analysis on a long cantilevered steel spiral stairs

钢结构螺旋楼梯作为一种小型空间结构越来越受到青睐。在计算螺旋楼梯舒适度方面,目前国内外并无相应的指导标准。参考国内外相关资料,对钢结构楼梯行人荷载选取、铺装面层的影响、舒适度评价标准等方面进研究。基于实际项目采用时程分析法对不同荷载工况下的楼梯舒适度进行分析。结果表明,对于单侧梁悬挑式螺旋楼梯,面层对结构的刚度影响较小,设计时可忽略其刚度影响;在忽略人体的阻尼的影响时,采用相应楼梯上的行人荷载计算,加速度计算结果会偏大,建议采用三向加权均方根加速度的标准评判舒适度。而在人群荷载下,由于楼梯螺旋导致的水平荷载方向不同,存在抵消作用,楼梯水平反应较小,因此在对螺旋楼梯舒适度进行评价时,水平刚度满足的前提下,可只考虑竖向加速度。

As a small space structure,steel spiral stairs are more and more popular.At present,there is no corresponding guidance standard at home and abroad in calculating the comfort of spiral stairs.Referring to the relevant data at home and abroad,the pedestrian load selection,the influence of pavement surface and the comfort evaluation standard of steel stairs were studied.Based on the actual project,the time history analysis method was used to analyze the comfort of stairs under different load conditions.The results show that for single-sided beam cantilever spiral stairs,the surface has little influence on the stiffness of the structure,and its stiffness influence can be ignored in the design.When ignoring the influence of human damping,the pedestrian load on the corresponding stairs will be calculated,and the acceleration calculation result will be too large,it is suggested to use the standard of three-dimensional weighted root mean square acceleration to evaluate the comfort.Under the crowd load,due to the different directions of horizontal loads caused by the spiral stairs,there is a counteracting effect.Therefore,when evaluating the comfort of spiral stairs,only the vertical acceleration can be considered on the premise that the horizontal stiffness meets the requirements.