摘要
为了满足工程结构与基础连接的承载力及变形要求,通常采用多个地脚螺栓组合锚固,正方形布置四组合地脚螺栓是常用的地脚螺栓形式。设计并制作不同间距、不同锚固长度的正方形布置四组合焊接锚板型地脚螺栓抗拔承载力试件,研究其抗拔荷载-变形特性及破坏模式,并与焊接锚板型单个地脚螺栓的试验结果进行对比。结果表明,锚固长度较小时四组合地脚螺栓群主要发生混凝土开裂后锚固失效,当锚固长度达到20d时地脚螺栓群发生屈服并达到极限抗拉承载力;设置组合型地脚螺栓群可以极大地提高地脚螺栓的极限抗拔承载力。开展四组合焊接锚板型地脚螺栓的抗拔承载力模拟分析,考察上拔受力时传力机理及其承载力变化规律。现有文献规范计算结果相对保守,均比试验值要小。
In order to meet the requirements of bearing capacity and deformation for connection between engineering structure and foundation,multiple anchor bolts are usually adopted to anchorage,and four combination anchor bolts with square arrangement are a common type of anchor bolt.This paper designs and makes the specimen for uplift bearing capacity of square arrangement and four combination welded anchor plate type anchor bolts with different spacing and different anchorage length,the uplift load-deformation characteristics and failure modes are studied experimentally,and the test results are compared with those of single anchor bolt.The failure of four combination anchor bolt mainly occurs after concrete cracking when the length of anchorage is small.When the anchorage length reaches 20 d,the anchor bolt yields and reaches the ultimate bearing capacity.The ultimate uplift bearing capacity of anchor bolts can be significantly improved by setting combined anchor bolt groups.The simulation analysis of the uplift bearing capacity of four combination anchor plate type anchor bolt is carried out,and the mechanism of load transfer and the law of bearing capacity during uplift are investigated.The code calculation results of existing literatures are relatively conservative and smaller than the experimental results.
作者
臧祥生
张大长
陈前
陈宣桦
陈效春
彭鹏
ZANG Xiangsheng;ZHANG Dachang;CHEN Qian;CHEN Xuanhua;CHEN Xiaochun;PENG Peng(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China)
出处
《建筑钢结构进展》
CSCD
北大核心
2021年第4期53-60,共8页
Progress in Steel Building Structures
基金
国家电网公司2017年总部科技项目。
关键词
锚板型地脚螺栓
四组合地脚螺栓群
抗拔承载力
传力机理
anchor plate type anchor bolt
four combination anchor bolt group
uplift bearing capacity
force transmission mechanism