摘要
针对承插型盘扣钢管支架(以下简称"盘扣支架"),采用现场检测、整架荷载试验、节点刚度试验以及数值分析等方法,开展了技术指标、力学性能、施工性能等研究。通过对某现场所采用盘扣支架构配件的插销抗拔力、水平杆接头强度等9项力学指标进行检测,结果表明支架外观、几何尺寸、力学性能等构配件指标基本满足施工质量要求;通过节点刚度加载试验,得出目前常规使用的盘扣支架节点刚度值约为27 kN·m/rad,达到规范要求的1. 4倍;针对3个步距的盘扣支架足尺模型,采用竖向、水平双向同时加载,进行了整架荷载试验,盘扣支架破坏形式呈现为顶部立杆局部失稳,整体支架的极限承载能力为规范计算值的1. 6倍,具有较大的安全储备;盘扣支架安装较为方便,其搭设效率约为碗扣支架的2倍,可有效缩短施工时间。因此,盘扣支架作为一种新型的承重支架形式,在承载能力、材料用量、搭设速度、施工安全性等方面具有明显优势,在桥梁工程中具有广泛的应用推广前景。
For socket type disk buckling steel tubular scaffold（ hereinafter referred to as ＂disk buckling scaffold＂）,by means of field test,load test on the whole scaffold,stiffness test on nodes and numerical analysis,the research on technical index,mechanical performance and construction performance is carried out. Through the test on 9 mechanical indexes of disk buckling scaffold accessories used at a construction site such as bolt pull-out resistance and joint strength of horizontal bar,it is found that the appearance,geometric dimensions and mechanical properties of the scaffold basically meet the construction quality requirements.According to the joint stiffness loading test,the joint stiffness of present normally used disk buckling scaffold is about 27 kN·m/rad,which is about 1. 4 times as much as the specification. For the full-scale model of 3-step disk buckling scaffold,the vertical,horizontal simultaneous loading is used for load test on the whole scaffold. The failure form of the disk buckling scaffold presents as the local instability of the top shaft,and the ultimate bearing capacity of the whole scaffold is 1. 6 times of the calculated value in the specification,which has a large safety reserve. The installation of disk buckling scaffold is convenient and its installation efficiency is about 2 times as much as that of cup buckling scaffold,and the construction time can be shortened effectively. Thus,as a new type of load-bearing bracket,disk buckling scaffold has obvious advantages in bearing capacity,material consumption,erection speed,construction safety and so on. It has abroad application prospect in bridge engineering.
作者
桂志敬
张建东
冯晓楠
刘朵
GUI Zhi-jing;ZHANG Jian-dong;FENG Xiao-nan;LIU Duo(School of Highway,Chang＇an University,Xi＇an Shaanxi 710064,China;JSTI Group,Nanjing Jiangsu 211112,China;Nanjing University of Technology,Nanjing Jiangsu 211816,China)
出处
《公路交通科技》
CAS
CSCD
北大核心
2018年第10期76-81,共6页
Journal of Highway and Transportation Research and Development
基金
国家重点研发计划项目(2017YFC0805300
2017YF0805302)
关键词
桥梁工程
支架安全
荷载试验
盘扣支架
节点刚度
bridge engineering
safety of scaffold
loading test
disk buckling scaffold
stiffness of joint
