摘要
通过有限元对比分析发现,在地铁基坑钢支撑系统中,抱箍作用在于减少钢支撑偏心受压状态下的计算长度,提高构件承载力。而抱箍能否发挥约束作用取决于抱箍自身强度与刚度,即不同规格抱箍对钢支撑的约束作用不同。因此有必要对极限承载力下不同规格抱箍的实际约束效果展开深入分析。计算钢支撑极限承载力时须明确约束点的具体构造设计,以便抱箍切实发挥作用。
Through finite element comparison analysis,it is found that in the steel support system of subway foundation excavation,the role of the hoop is to reduce the calculated length under the support eccentric compression state and improve the bearing capacity of the member. And whether the hoop can exert the restriction effect depends on the strength and rigidity of the hoop itself. The restriction effect of the hoops of different specifications on the steel support is different. Therefore,it is necessary to carry out an in-depth analysis on the actual restraining effects of hoop with different specifications under the ultimate bearing capacity. Meanwhile,in calculating the ultimate bearing capacity of the support,it is necessary to clarify the specific structural design corresponding to the constraint point in order to effectively play its role.
作者
孙九春
白廷辉
SUN Jiuchun;BAI Tinghui(Tengda Construction Group Co.,Ltd.,Shanghai 200122,China;Shanghai State-owned Assets Supervision and Administration Commission,Shanghai 200003,China)
出处
《施工技术》
CAS
2020年第3期92-94,共3页
Construction Technology
基金
软土地铁基坑的施工控制理论与实践(2016-sh-01)
关键词
地铁
基坑
钢支撑
抱箍
约束作用
优化设计
承载力
subways
foundation excavaton
steel supports
hoops
restriction effect
optimized design
bearing capacity
