Experimental study on flexural performance of concrete beams with HRB600 steel bars

Journal Information

J. Hefei Univ. Tech. (Nat. Sci.), Feb.2023, Vol.46 No.2: 212-220

DOI: 10.3969/j.issn.1003-5060.2023.02.011

Authors

CHEN Anying $ ^{1,2} $, DENG Song $ ^{1} $, GAO Peng $ ^{1} $, WAN Haiying $ ^{1,2} $, ZHU Hua $ ^{3} $, LIU Xiyang $ ^{1} $

(1. School of Civil and Hydraulic Engineering, Hefei University of Technology, Hefei 230009, China; 2. Hefei University of Technology, Gongda Engineering Inspection and Testing Co., Ltd., Hefei 230009, China; 3. Anhui Huanyu Architectural Design Institute, Hefei 230012, China)

Abstract and Keywords

Abstract: In order to study the flexural performance of concrete beams with HRB600 steel bars, twelve concrete beams with HRB600 steel bars and C50 concrete under different reinforcement ratios were designed and fabricated. Experimental study on the damage modes, design value for steel bar strength, ultimate bearing capacity, midspan deflection and crack width of the members was conducted by means of three-point static loading. The results show that the force patterns and damage modes of concrete beams with HRB600 steel bars are the same as those of the concrete beams with ordinary rebar, and their ultimate bearing capacity can still be calculated according to the relevant code formula. It is recommended that for flexural members, the standard value for yield strength of HRB600 steel bars is 600 MPa, design value for tensile strength is 520 MPa and design value for compressive strength is 435 MPa. Comparing the measured values of mid-span deflection with the calculated values in the relevant code, there is a good agreement between the two values in the normal use phase. The measured maximum crack width values of the members are larger than the calculated values in the relevant code. and on the basis of this result, the adjustment coefficient k of maximum crack width is proposed, and the formula for calculating maximum crack width under short-term load in the code is modified. The calculated values obtained after adjustment are in good agreement with the measured values.

Keywords: HRB

作者信息

陈安英 $ ^{1,2} $，邓松 $ ^{1} $，高鹏 $ ^{1} $，完海鹰 $ ^{1,2} $，朱华 $ ^{3} $，刘西洋 $ ^{1} $

(1. 合肥工业大学土木与水利工程学院，安徽合肥 230009；2. 合肥工大共达工程检测试验有限公司，安徽合肥 230009；3. 安徽寰宇建筑设计院，安徽合肥 230012)

摘要和关键词

摘要: 为研究配置 HRB600 级钢筋混凝土梁的抗弯性能,文章设计制作 12 根不同配筋率的 HRB600 级钢筋、C50 混凝土梁,采用三分点静力加载的方式,对试件的破坏形态、钢筋强度设计值取值、极限承载力、跨中挠度及裂缝宽度等进行试验研究。结果表明,配置 HRB600 级钢筋混凝土梁的受力形态、破坏模式与普通钢筋混凝土梁相同,其极限承载力仍然可以按照相关规范公式进行计算;建议对于受弯构件,HRB600 级钢筋的屈服强度标准值取 600 MPa,抗拉强度设计值取 520 MPa,抗压强度设计值取 435 MPa;对比跨中挠度实测值与相关规范计算值,发现两者在正常使用阶段吻合良好;试件实测最大裂缝宽度值比相关规范计算值大,在此结果基础上提出最大裂缝宽度调整系数 k,对短期荷载作用下最大裂缝宽度计算公式进行修正,调整后得到的计算值与实测值吻合度较高。

关键词: HRB600级钢筋；混凝土梁；受弯性能；钢筋强度设计值；最大裂缝宽度

Funding

安徽省高校协同创新资助项目(GXXT-2019-005);安徽省地方规程《高强钢筋应用技术规程》专题研究资助项目(W2019JSFW0011)

合肥工业大学学报(自然科学版)

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