与600 MPa钢筋混合配置的预应力筋应力增量的试验研究

李强; 马卫华; 康洪震; 朱志东

doi:10.13204/j.gyjzG20092304

与600 MPa钢筋混合配置的预应力筋应力增量的试验研究

doi: 10.13204/j.gyjzG20092304

李强^1,2,
马卫华^1,2,
康洪震^1,2,
朱志东³

1. 唐山学院土木工程学院, 河北唐山 063000;
2. 河北省建筑工程与尾矿综合利用重点实验室, 河北唐山 063000;
3. 唐山建苑建设工程材料检测有限公司, 河北唐山 063000

基金项目:

河北省高等学校科学技术研究项目（QN2021319，BJ2020204）；唐山市科技计划项目（21130206C）；唐山市重点研发计划（19150233E）。

详细信息

作者简介:
李强,男,1984年出生,博士,讲师。电子信箱:l12345q@163.com

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出版历程
- 收稿日期: 2020-09-23
- 网络出版日期: 2022-04-24

Experimental Research on Stress Increment of Prestressed Tendon Working with 600 Megapascals Steel Bars

1. Collge of Civil Engineering, Tangshan University, Tangshan 063000, China;
2. Hebei Key Laboratory of Building Engineering and Tailings Utilization, Tangshan 063000, China;
3. Tangshan Jianyuan Construction Engineering Material Testing Co., Ltd., Tangshan 063000, China

摘要

摘要: 通过配置600 MPa钢筋的无黏结部分预应力混凝土梁受弯试验，分析了无黏结预应力筋应力增量的发展规律及其影响因素，提出了配置600 MPa钢筋的部分预应力混凝土梁的无黏结预应力筋极限应力增量计算式。试验结果表明：中前期普通钢筋主要承受拉应力，预应力筋应力增量发展较为缓慢；当普通钢筋屈服后，预应力筋应力增量显著提高，从而保证600 MPa钢筋强度得以充分发挥。采用文中算式验算了69根试验梁的无黏结预应力筋极限应力增量，计算值与实测值较为接近，分析结果表明该算式计算准确性较好，适用范围合理。
- 部分预应力混凝土梁 /
- 600 MPa钢筋 /
- 无黏结预应力筋 /
- 应力增量 /
- 综合配筋指标
Abstract: Based on flexural experiment of the partially prestressed concrete beams with 600 MPa steel bars, the development laws and influencing factors of stress increment of unbonded prestressed tendons were analyzed. The formula for calculating the ultimate stress increment of the unbonded prestressed tendons, adopted to partially prestressed concrete beams with 600 MPa steel bars was proposed.The results indicated that there was only a slight growth of stress increment of unbonded prestressed tendons in earlier stage, while the non-prestressed steel bars bore the majority of tensile stress. The growth of stress increment of tendons accelerated obviously after steel bars yielding, resulting in full use of strength of 600 MPa steel bars.Through checking and calculating the ultimate stress increment for 69 beams,the results showed that the proposed formula had the reasonable applied scope and high accuracy.
- partially prestressed concrete beam /
- 600 MPa steel bar /
- unbonded prestressed tendons /
- stress increment /
- composite reinforcement index

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参考文献(16)

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