内置钢索盘扣式脚手架抗倒塌性能研究
Study on the Collapse Performance of Bell-Spigot Type Scaffold with Built-in Steel Cables
彭竟锋 1潘子煜 1曹文斌 1陈润浩 1温德超 1彭艺斌2
作者信息
- 1. 广州打捞局,广东 广州 510320
- 2. 长沙理工大学土木工程学院,湖南 长沙 410114
- 折叠
摘要
[目的]传统盘扣式脚手架倒塌事故频发,为解决这一问题,提出一种内置钢索的盘扣式脚手架,通过增设带有初始预拉力的钢索来提高结构的抗倒塌能力.[方法]采用ANSYS软件对4组盘扣式脚手架模型进行抗连续倒塌性能分析,研究设置3种荷载工况,并对比分析4组模型在这些工况下的表现.[结果]研究发现,仅用带预拉力钢索代替斜杆的模型(MJ-2)并不能有效提高结构的抗倒塌能力,而在结构内部增设带预拉力钢索的模型(MJ-3)和在此基础上再将斜杆替换成带预拉力钢索的模型(MJ-4)能显著改善构件破坏后的安全性和稳定性.然而,在1.6 kN荷载下,MJ-3和MJ-4模型由于钢索初始拉力过大,导致结构产生较大的向上位移,对结构的安全性不利.[结论]增设带初始预拉力的钢索可以显著提高盘扣式脚手架的抗倒塌能力,后续研究将进一步优化钢索初始拉力参数,并对中柱破坏和角柱破坏的影响进行更深入的分析.
Abstract
[Purposes]The collapse accidents of traditional bell-spigot type scaffold occur frequently.In order to solve this problem,this paper proposes a bell-spigot type scaffold with built-in steel cables,which im-proves the collapse resistance of the structure by adding steel cables with initial pre-tension.[Methods]In this paper,ANSYS software was used to analyze the progressive collapse resistance of four groups of bell-spigot type scaffold models.Three load conditions were set up in the study,and the performance of the four groups of models under these conditions was compared and analyzed.[Findings]It is found that the collapse re-sistance of the structure can not be effectively improved by only using the model with pre-tensioned cables in-stead of inclined rods(MJ-2).However,the model with pre-tensioned cables(MJ-3)and the model with in-clined rods replaced by pre-tensioned cables(MJ-4)can significantly improve the safety and stability of the structure after failure.However,under the load of 1.6 kN,the MJ-3 and MJ-4 models have a large upward dis-placement of the structure due to the excessive initial tension of the cable,which is unfavorable to the safety of the structure.[Conclusions]The addition of steel cables with initial pre-tension can significantly improve the collapse resistance of bell-spigot type scaffold.The subsequent research will further optimize the initial ten-sion parameters of steel cables,and analyze the influence of middle column failure and corner column failure.
关键词
盘扣式脚手架/抗倒塌/拆除构件法/有限元分析Key words
bell-spigot type scaffold/collapse-resistant/member removal method/finite element analysis引用本文复制引用
出版年
2024
NETL
NSTL
万方数据