钢筋混凝土框架结构中楼梯间布置位置的研究

Research on location of stairwells in RC frames

按照现行规范设计了一栋6层钢筋混凝土框架结构,并对其楼梯间布置位置选用了6种方案,通过对其进行静力弹塑性分析,研究楼梯间位置对框架结构的振型、内力及破坏机制的影响。分析表明:楼梯间的位置对主体结构刚度及内力分布影响较大,在建筑与结构设计时,应考虑楼梯间位置所带来的不利影响;对于普通钢筋混凝土框架结构,其楼梯间应尽量布置在结构平面的外围,以减小整体结构的扭转效应,但楼梯间不宜布置在结构最边跨,而应布置在边跨的内一跨;对靠近结构中部的楼梯间,结构设计时应考虑由其带来的扭转效应,而对布置在靠近结构周边的楼梯间,则应考虑与楼梯间相连的结构构件内力增大的影响。

Six kinds of arrangement of the stairwells according to current Chinese codes for design were designed. Pushover analysis were conducted on the models to find out the effect of stairwell location on the frame structure in terms of the vibration, internal forces and failure mechanism. The calculation results show that the location of stairwell has impact on the stiffness and internal force distribution of the main structure, thus the impact should be fully considered in the design of frame structures. For ordinary reinforced concrete frame structures, the stairwells should be arranged in the periphery of the structure in order to reduce the torsion effect. However the best arrangement of stairwells is not in the side span, but the span beside the side span. If the stairwell is arranged in the center, the effect of torsion should be fully considered. If the stairwell is arranged near the side, the increase of structural internal force should be fully considered during the design.