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Experimental Study on Bending Performance of Ultra-high Strength Reinforced Concrete Beams under Static Loading
- Acta Armamentarii Vol. 44, Issue S1, Pages: 107-116(2023)
- 作者机构：
1. 宁波大学 冲击与安全工程教育部重点实验室, 浙江 宁波 315211
2. 军事科学院 国防工程研究院, 河南 洛阳 471023
3. 河南省特种防护材料重点实验室, 河南 洛阳 471023
- 作者简介：
- 基金信息：
DOI：10.12382/bgxb.2023.0751
CLC：Received：15 August 2023，
Published Online：03 January 2024，
Published：08 December 2023
- 稿件说明：
移动端阅览
Congkun ZHANG, Zhonghao ZHANG, Wei WANG, et al. Experimental Study on Bending Performance of Ultra-high Strength Reinforced Concrete Beams under Static Loading[J]. Acta Armamentarii, 2023, 44(S1): 107-116.
Congkun ZHANG, Zhonghao ZHANG, Wei WANG, et al. Experimental Study on Bending Performance of Ultra-high Strength Reinforced Concrete Beams under Static Loading[J]. Acta Armamentarii, 2023, 44(S1): 107-116. DOI： 10.12382/bgxb.2023.0751.
摘要
为研究配置超高强钢筋混凝土梁的抗弯性能
设计制作11组不同钢筋强度、混凝土强度、配筋率的钢筋混凝土梁
采用四点弯曲静力加载的方式
对试件的破坏形态、弯曲响应、屈服荷载、极限承载力及裂缝宽度等进行试验研究。结果表明
加强钢筋的强度可以提高钢筋混凝土梁的最大承载能力;增加混凝土强度对梁的抗弯承载能力影响相对较小;增加纵向钢筋配筋率能够明显提高钢筋混凝土梁的抗弯承载能力;HTRB600/700超高强钢筋混凝土梁在受力形态、弯曲响应和破坏模式方面与普通钢筋混凝土梁相同
其屈服荷载和极限承载力仍然可以按照相关规范公式进行计算;对于受弯梁构件
HTRB600级钢筋的抗拉强度设计值建议取520MPa
HTRB700级钢筋的抗拉强度设计值建议取610MPa;在短期荷载作用下超高强钢筋混凝土梁试件实测的最大裂缝宽度值比相关规范计算值大
因此提出了一个最大裂缝宽度调整系数
k
并进行了计算公式的修正
经过调整后得到的计算值与试验实测值吻合度较高。
Abstract
11 sets of reinforced concrete beams with different steel bar strength
concrete strength
and reinforcement ratios are designed and manufactured to study the bending performance of ultra-high strength reinforced concrete beam. The failure morphology
bending response
yield load
ultimate bearing capacity
and crack width of specimen are experimentally studied using a four-point static loading method. The results indicate that the maximum bearing capacity of reinforced concrete beam can be improved by strengthening the strength of steel bars
the increase in the strength of concrete has a relatively small impact on the flextural bearing capacity of beam
and the increase in the longitudinal reinforcement ratio can significantly improve the flextural bearing capacity of reinforced concrete beams. The HTRB600/700 ultra-high strength reinforced concrete beam is the same as ordinary reinforced concrete bea
m in terms of stress morphology
bending response
and failure mode. Its yield load and ultimate bearing capacity can still be calculated usung relevant code formulas. For bending beam components
the recommended design value for tensile strength of HTRB600 steel bars is 520MPa
and the recommended design value for tensile strength of HTRB700 steel bars is 610MPa; The measured maximum crack width of ultra-high strength reinforced concrete beam specimen under short-term load is greater than the calculated value in relevant specifications. Therefore
the adjustment coefficient
k
of a maximum crack width is proposed and the calculation formula is modified. After adjustment
the calculated value obtained is in good agreement with the experimentally measured value.
关键词
Keywords
references
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