
12
DOI:10.7672/sgjs2014040012
施工技术
CONSTRUCTION TECHNOLOGY
2014年2月下第43卷第4期
基于ABAQUS的带施工缝钢筋混凝土框
架抗震性能研究阎西康,侯小磊,陈培,马康(河北工业大学土木工程学院,天津
300401)
[摘要】使用ABAQUS对试验2榻框架建立有限元模型,1福为整浇结构(ZJ),1榻为带施工缝结构(DF)。将数值分析结果与试验结果对比,两者较好吻合可确定数值模型的正确性。对2榻框架模型进行时程分析,将位移时程、底部剪力等结果做对比分析,结果表明:在7度罕遇地震和8度多遇地震下,DF框架顶层和首层的位移峰值均大于ZJ框架;ZJ框架剪力峰值几乎均大于DF框架。由此得出施工缝的存在对框架结构抗震性能确有不利影响,在
设计与施工中应加强施工缝的处理,提高其强度以降低对结构抗震性能的不利影响。【关键调】框架结构;施工缝:抗震;时程分析;有限元分析
【中图分类号】TU375
【文献标识码】A
【文章编号】1002-8498(2014)04-0012-05
Study on Seismic Behaviorof Reinforced ConcreteFrame
withConstructionJointsBasedonABAQUS
Yan Xikang, Hou Xiaolei,Chen Pei,Ma Kang
(College of Civil Engineering, Hebei University of Technology, Tianjin 300401, China)
Abstract:In this paper, authors established a finite element model of two frames of experiment with ABAQUS, the one is integral pouring structure(ZJ), and the other is the structure with construction joints (DF). Through the comparison of simulation result and the experiment results, the finite element models are right when they coincide well. This paper uses time-history analysis to study two frame models of experiment and frame models of different construction joints. Based on the analysis of displacement time-history and shear time-history, the results show that under the 7 degree rare earthquakes and 8 degree frequent earthquakes, for the displacement maximum of two floors, DF frame is bigger than ZJ frame.And for the shear maximum of bottom,ZJ frame is bigger than DF.The results show that construction joints have detrimental effect to the frames. When construction joints are processed well, the detrimental effect can be reduced or the detrimental effect will increase
Key words: structural frames; construction joints; seismic; time-history analysis; finite element analysis
建筑工程中,钢筋混凝土结构通常无法实现连续浇筑,先后浇筑混凝土时间间隔超过初凝时间即形成施工缝,常留置在柱底或梁柱交界面,是结构受力较大且复杂的部位。由调查资料可知,近年来地震灾害中多有框架结构柱端和梁柱节点下部位置的破坏。课题组对整浇和带施工缝2框架进行拟静力试验,在试验基础上,运用ABAQUS对结构进行数值分析,以深人了解施工缝对框架结构抗震性能的影响。
·天津市自然科学基金项目(11JCYBJC03100)
【作者简介】阅西康,教授,博士,E-mail:tijsyk126.com
[收精日期】2013-07-24 万方数据
1
试验概况
试验制作2榻钢筋混凝土框架缩尺模型,1
榴整浇框架编号ZJ1福带施工缝框架编号DF。2 榻框架尺寸、混凝土强度、配筋等完全相同,试验模型如图1所示。DF框架分次立模浇筑,1层柱顶端和底端分别设第1,2层施工缝,2层柱顶端和底端分别设第3,4层施工缝。1,4层施工缝按规范良好处理:继续浇筑混凝土前清除浮浆和松动石子,冲洗干净并充分润湿,然后铺1层约15mm厚与混凝土同配合比的水泥砂浆,再浇筑混凝土充分振捣。 2,3层施工缝简单处理:继续浇筑混凝土前清除浮浆和松动石子,冲洗干净并充分润湿,再浇筑混凝