六边形平面楼盖开洞对结构抗震性能的影响分析

本文以贵州省博物馆新馆仪式大厅结构为背景,分别考虑楼盖刚性假定和弹性假定,针对楼盖开洞引起的平面不规则性进行了6个算例的抗震性能研究。分析表明:六边形平面的周边框架和洞口周围框架形成密柱框筒;楼盖开洞未造成明显的扭转影响,也未明显削弱结构抗侧刚度;楼盖开洞位置的选择较为重要,否则调整刚心与质心的位置偏差而增大结构抗侧刚度时容易导致位移比出现小数比小数而不易满足要求;开洞面积的大小不宜作为结构超限的硬性指标,而应以结构抗侧刚度和楼层受剪承载力作为辅助判别标准;楼盖开设大洞口后结构整体分析宜按弹性楼盖假定,但楼盖弹性假定计算的位移比要小于刚性假定计算的位移比;楼盖的刚、弹性假定对楼层地震剪力计算结果的影响几乎可以忽略。

Seismic Performance Analysis of Hexagon Plane Structure Characterized by Floor Openings

Taking the ceremony hall structure of the new museum in Guizhou province as the engineering background,this paper considers floor assumption of elastic and rigid,and make six examples of seismic performance studies for plane irregular caused by floor openings.The analysis shows that the frame around the hexagonal plane and the hole form dense columns frame tube;floor open hole don＇t cause apparent reverse effect,also do not significantly weaken the lateral stiffness of the structure;or adjust the position deviation of the center of the stiffness and quality just easily lead to a decimal fraction leaving the displacement ratio is not easy to meet the requirements;the size of hole area should not be as mandatory targets for structure gauge to be overrun with lateral stiffness of the structure and floor shear strength as a supplementary criterion;after opening a large hole,floor integral analysis should be assumed by flexible floor,but the displacement ratio of the calculation for elastic assume less than rigid;the effect of seismic floor shear based the elastic and rigid assume almost can be ignored.