核心筒超前施工层数分析方法研究

Analysis method of advanced construction layers for core tube

目前国内外学者对于确定超前施工层数方法的研究还比较少,现行规范中没充分考虑各种墙肢之间连接,因此规定的长度系数取值往往偏大,以至于确定的超前施工层数偏低.基于安全与经济两方面的考虑,从《高规》附录D的规定出发,根据实际的结构和荷载特点,运用ANSYS软件对超前施工核心筒进行屈曲模拟分析,根据数值模拟结果重新计算考虑墙肢实际支撑条件后的计算长度系数,运用得到的实际计算长度系数,根据规范计算出等效竖向均布荷载,与有限元模型根据实际荷载计算得到的等效竖向均布荷载进行比较,看是否满足规范要求.增加或减少超前施工层数进行试算,比较分析考虑墙肢实际支撑条件前后核心筒墙肢的稳定性,最终得到最大超前施工层数.以武汉中心核心筒超前施工为例进行研究,结果表明,所述的比较方法是可行有效的,能得到既安全又经济的最优超前施工层数.

At present, the study on analysis method of advanced construction layers for core tube is limited. The connection among walls has not been considered in the current standard, which makes the calculating effective length coefficient overestimated and the advanced construction layers underestimated. Based on considerations of the structure and load characteristics, this paper analyzes and simulates the advanced construction of the core tube by using ANSYS software. The calculating effective length coefficient should be corrected, which is used to figure out the actual load. The actual load is compared with the calculated load and figured out whether it meets the standard. And then the local stability of core tube shearwall is compared before and after correction to determine reasonable core tube layers of advanced construction. Taking Wuhan Center for example, the results show that our comparative method is feasible and effective, which can get safe and economical layers of advanced construction.