大直径钢筋混凝土梁短期最大裂缝宽度试验研究
Experimental Research on Short-Term Maximum Crack Width of Large-Diameter Reinforced Concrete Beams
王振兴 1丛峻 2朱彤 1张磊 1陈文强 1郭建涛 1张志超1
作者信息
- 1. 中国建筑股份有限公司技术中心,北京 101300
- 2. 中国建筑股份有限公司技术中心,北京 101300;西安建筑科技大学土木工程学院,西安 710055
- 折叠
摘要
为研究HRB400 级大直径钢筋混凝土梁正常使用极限状态短期最大裂缝宽度计算方法,测量了 4 组 5 个梁各级荷载下短期最大裂缝宽度,分析了大直径钢筋布置在内侧和外侧以及箍筋间距对短期最大裂缝宽度的影响,根据实测结果对 GB/T 50010-2010《混凝土结构设计标准》短期最大裂缝宽度公式提出了修正建议.结果表明:箍筋间距为 100、200 mm时平均裂缝间距与箍筋间距接近,大直径钢筋布置在外侧对减小短期最大裂缝宽度更为有效,约为布置在内侧的 91.5%,根据《混凝土结构设计标准》计算的短期最大裂缝宽度明显大于试验值,考虑箍筋间距和钢筋高应力工作影响的短期最大裂缝宽度计算式所得计算值与实测值吻合较好.
Abstract
In order to study the calculation method for short-term maximum crack width of HRB400 large diameter reinforced concrete beams under normal service limit states,the short-term maximum crack width of four groups of five beams under various loads was measured,and the effects of the arrangements of large-diameter steel rebars on the inside and outside and the spacing of stirrups on the short-term maximum crack width were analyzed.Based on the measured results,suggestions for revising the short-term maximum crack width formula in the Code for Design of Concrete Structures(GB/T 50010-2010)were proposed.The re-sults showed that when the stirrup spacing was 100 or 200 mm,the average crack spacing was close to the stirrup spacing,and the arrangements of large diameter steel rebars on the outside were more effective in re-ducing the short-term maximum crack width,which was about 91.5%of that arranged on the inside.The short-term maximum crack width calculated according to the specifications GB 50010-2010 was signifi-cantly larger than the experimental values,and the short-term maximum crack width calculation formula considering the effects of stirrup spacing and high stress work of the steel rebars agreed well with the meas-ured values.
关键词
HRB400/大直径钢筋混凝土梁/正常使用极限状态/短期最大裂缝宽度/混凝土结构设计标准Key words
HRB400/large-diameter reinforced concrete beams/serviceability limit states/short-term max-imum crack width/Code for Design of Concrete Structures引用本文复制引用
出版年
2024
NETL
NSTL
万方数据