装配式混凝土剪力墙上下层钢筋间接搭接单向拉伸试验及有限元模拟.pdf

2015年第11期(总第313期
混
凝
土
理论研究
Number 1] in 2015(Total No 313)
Concrete
THEORETICAL RESEARCH
doi:10.3969/isn.1002-3550.2015.1.004
装配式混凝土剪力墙上下层钢筋间接搭接单向
拉伸试验及有限元模拟
周剑,赵作周“,侯建群”,任宝双
(清伴大学a.土木工程安全与耐久教育部重点实验空;b.建筑设计研究院有限公司,北京100064
摘要:进行了6个间接搭接试件的单向拉仲试验,结果表明所选取的搭接长度能够满足承载力要求,但搭接长度为1.0倍和
1.2倍设计错固长度的两个试件在连接筋服前就发生自由端滑移,根据应变分布変化及对比结果,建议设计搭接长度取为设计
错固长度的1.5倍。采用 ABAQUS中 Spring2非线性弹簧单元对锚固拉拔试验和本试验进行了有限元模拟,结果表明采用
Spring2单元可以准确模拟错固拉拔试验,对于连接筋连接试验,计算所得加载曲线和自由端滑移规律与试验相符,但连接筋应
力分布有较大差别
关键词:单向拉伸;装配式;剪力墙;连接筋;间接搭接
中图分类号:TU528.01文献标志码:A文章编号:1002-3550(2015)1-0012-05
Uniaxial tension test an finite element simulation of indirect lap splice between
the upper and lower floors of fabricated concrete shear walls
ZHOU Jian, ZHAO Zuzhou, HOU Jianqun, REN Baoshuang
(a Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry:
b Architectural Design and Research Institute of Tsinghua University Co, Ltd, Tsinghua University, Beijing 100084, China
Abstract: Uniaxial tension tests of six specimens with indirect lap splice have been completed. It has been concluded that the used splice
length is enough to meet the demand of tension capacity, but the slippages of free ends were observed for the two specimens with splice
length of 1.0 and 1.2 times design anchorage length before the yielding of splice rebar. A splice length which is equal to 1.5 times the
design anchorage length of splice rebar is suggested according to strain distribution and its variation Finete element simulation of anchor
age pull-out test done by others and the tests in this paper has been conducted by using the Spring 2 element of ABAQUS software
The simulation results of pull-out test are accurate, the calculated loading curve and the law of free end slippage are in accord with the
test results, but there are some differences between simulation and test for the stress distribution of splice rebar
Key words: uniaxial tension; fabricated; shear wall; splice rebar; indirect lap splice
0)引言
针对间接搭接,ACI318-11规定,在受弯构件中,
钢筋横向间距不应大于0.2倍搭接长度和6英寸
对于现浇混凝土剪力墙结构,上下层钢筋通常采用绑
(152mm)二者的较小值,我国建筑标准设计图集11G101
扎搭接的形式实现连接,但对于装配式混凝土剪力墙结构
采用同样的要求。
而言,比如叠合板式混凝土剪力墙,预制圆孔板剪力
墙,装配整体式双向孔空心模板剪力墙3等,在吊装上
墙厚
连接筋
连接
竖向分布筋
层预制墙板时,下层预留的竖向连接钢筋通过插入上层预
预制部分
?项面体
空腔或竖向孔
楼板
楼板
制墙板内的预留空腔或竖向孔内,通过向空腔或孔内灌浆
或浇筑混凝土连成整体,下层连接筋与上层竖向钢筋之间
存在一定间距,形成一种“间接搭接”形式(又称非接触搭
下层墙体
下层墙体
接)(如图1(a)所示),这与现浇混凝土结构中的接触绑扎
(a)连接筋插入连接
(b)附加単排连接筋迁接
搭接不同。对于采用套筒灌浆或浆锚搭接的预制剪力墙,
1装配式混凝土剪力墙上下层连接筋连接
当竖向分布钢筋采用附加单排连接筋连接时“(如图
Sagan等基于钢筋非接触搭接的拉伸试验,建议单
b)所示),连接筋与预制墙体内竖向分布筋之间也属于调荷载下当搭接钢筋间距小于12倍钢筋直径和305mm
间接搭接。
及往复荷载下小于8倍钢筋直径和203mm时、可忽略间
收稿日期:2015-02-05
基金项目:国家高技术研究发展计划(863计划)课题(2013AAO41307