摘要
随着一些标志性的连续性倒塌事件发生,连续性倒塌问题开始受到广泛关注。但是迄今为止,较多成果主要集中在空间网格结构的抗连续倒塌机制,分析方法等方面,对如何提升此类结构的抗连续倒塌研究较少。文中基于ABAQUS有限元软件,通过分别加强径杆、环杆、斜杆(增加截面的直径),研究它们在网壳抗连续倒塌过程中的重要性。在此基础上,有针对性的提出有效加强措施,以提升网壳的抗连续倒塌性能。结果表明加强径杆可提升网壳抗连续倒塌性能。加强部分环杆和斜杆可提升结构的抗连续倒塌性能,且越靠近顶点与支座之间的中部位置,提升程度越明显。考虑用钢量与极限承载力的关系,同时增强网壳的径杆,第3、4环环杆,第3、4环斜杆对网壳抗连续倒塌性能的提升效果最好。
Along with the occurring of symbol progressive collapse events,progressive collapse has attracted widely attention.However,most of the achievements mainly focus on the collapse-resistant mechanisms and analysis methods of spatial grid structures,and there is little discussion on how to improve the collapse-resistant behavior of such structures.Herein,the importance of reinforcing the radial members,the ring members and the diagonal members in the progressive collapse resistance of reticulated shells was studied by ABAQUS software.Furthermore,the effective reinforced measures were put forward to improve the collapse resistance of reticulated shells.The analytical results show that the radial members reinforcement can improve the resistance of reticulated shells to progressive collapse,and ring members and diagonal members reinforcement close to the middle position between the vertex and the support can improve the collapse-resisting performance of shells.In addition,considering the relationship between steel consumption and ultimate bearing capacity,simultaneously reinforcing all the radial members,the ring members of the 3rd and 4th ring,and the diagonal members of the 3rd and 4th ring have the best effect on the improvement of the resistance to progressive collapse of reticulated shells.
作者
王媛
聂晓宁
WANG Yuan;NIE Xiaoning(Xi’an University of Architecture and Technology Huaqing College,Xi’an 710043,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 200941,China)
出处
《低温建筑技术》
2020年第11期54-57,共4页
Low Temperature Architecture Technology
关键词
单层网壳
连续性倒塌
性能提升
数值模拟
single-layer reticulated shell
progressive collapse
behavior improvement
numerical simulation
