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Analysis of flexural interaction between high-strength concrete and high-strength steel in reinforced concrete.

机译：钢筋混凝土中高强度混凝土与高强度钢之间的挠性相互作用分析。

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摘要

In the history of reinforced concrete, the strength of the concrete has risen dramatically while the strength of the steel reinforcement has not. Codes throughout the world set limits on the usable strength of the reinforcement.;Limits on reinforcement strength range from the Australian Code's 65 ksi (450 MPa) to ACI's 80 ksi (550 MPa) to Sweden's 85.5 ksi (590 MPa). These limits have some basis in deflection control and some basis in crack control but the underlying reasoning is not adequately defined.;This thesis examines the theoretical problems involved with the use of high-strength flexural reinforcing steel in beams, emphasizing the combination of high-strength steel with high-strength concrete. High-strength steel means steel with a yield strength equal to or greater than 75 ksi (517 MPa) and high-strength concrete means concrete with an f'c equal to or greater than 8 ksi (55 MPa).;Topical areas addressed include: (1) Stress-strain relationships; (2) Deflection; (3) Cracking; (4) Ductility; (5) Code limits and design methodology; and, (6) The concept of balanced reinforcement percentage as f'c and fy increase.;A computer model was created to simulate a reinforced concrete beam under flexure. An important purpose of the model is the prediction of performance under the actual service loads. It is essential to know if the service loads co-exist with section properties that insure adequate crack and deflection control. The effects of reinforcing bar size and placement, number of rows used, cover, and spacing between rows and bars are examined.;Comparisons of the predicted performance of sections reinforced with various grades of concrete and steel allowed determination of the validity of current Code limits on reinforcement strength. The comparisons lead to the conclusion that there is a not a strong reason for limiting the strength of reinforcement to the current levels. The comparisons show that better designs can be made with higher strength steels and that there are times when higher strength steels should be used, particularly when combined with higher strength concrete.
机译：在钢筋混凝土的历史中，混凝土的强度急剧上升，而钢筋的强度却没有显着提高。全世界的规范都对钢筋的可用强度设置了限制。钢筋强度的限制范围从澳大利亚规范的65 ksi（450 MPa）到ACI的80 ksi（550 MPa）到瑞典的85.5 ksi（590 MPa）。这些限制在挠度控制中有一定的依据，在裂纹控制中有一定的依据，但尚无充分的潜在理由。；本论文研究了梁中使用高强度抗弯钢筋所涉及的理论问题，强调了高强度抗弯钢筋的组合。高强度钢与高强度混凝土。高强度钢是指屈服强度等于或大于75 ksi（517 MPa）的钢，而高强度混凝土是指f'c等于或大于8 ksi（55 MPa）的混凝土。 ：（1）应力-应变关系； （2）挠度； （3）开裂； （4）延展性； （5）代码限制和设计方法； （6）随着f'c和fy的增加，平衡钢筋百分比的概念。创建了计算机模型来模拟受弯钢筋混凝土梁。该模型的一个重要目的是预测实际服务负载下的性能。重要的是要知道服务荷载是否与截面特性共存，以确保适当的裂纹和挠度控制。检查了钢筋尺寸和位置，使用的行数，覆盖层以及行与钢筋之间的间距的影响;比较了不同等级的混凝土和钢材所增强的截面的预期性能，从而可以确定当前规范限制的有效性增强强度。比较得出的结论是，没有充分的理由将增强强度限制在当前水平。比较表明，使用高强度钢可以进行更好的设计，并且有时应使用高强度钢，特别是与高强度混凝土结合使用时。

著录项

  • 作者

    Zachar, John Andrew.;

  • 作者单位

    The University of Wisconsin - Milwaukee.;

  • 授予单位 The University of Wisconsin - Milwaukee.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 1991
  • 页码 144 p.
  • 总页数 144
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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