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。
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 results 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 reducing 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 significantly 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 measured values.
作者
王振兴
丛峻
朱彤
张磊
陈文强
郭建涛
张志超
WANG Zhenxing;CONG Jun;ZHU Tong;ZHANG Lei;CHEN Wenqiang;GUO Jiantao;ZHANG Zhichao(China State Construction Corporation Limited Technical Center,Beijing 101300,China;School of Civil Engineering,Xi’an University of Architecture and&Technology,Xi’an 710055,China)
出处
《工业建筑》
2024年第12期121-127,共7页
Industrial Construction
基金
中国建筑股份有限公司科研课题(CSCEC-2020-Z-18)。
