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Determination of Moment Parameters of Rectangular Stress Block for High-Strength Prestressed Concrete | ||
| Civil Engineering and Applied Solutions | ||
| مقالات آماده انتشار، پذیرفته شده، انتشار آنلاین از تاریخ 14 مهر 1404 | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22080/ceas.2025.29949.1040 | ||
| نویسنده | ||
| Shahram Maghsodian* | ||
| Department of Civil Engineering, Islamic Azad University, Nour Branch, Nour, Iran | ||
| تاریخ دریافت: 06 شهریور 1404، تاریخ بازنگری: 08 مهر 1404، تاریخ پذیرش: 12 مهر 1404 | ||
| چکیده | ||
| Various structural design codes for reinforced and prestressed concrete propose different equations and recommendations for the parameters of the rectangular stress block. However, these formulations are often valid only for a specific ultimate strain and are primarily based on concrete with a compressive strength below 50 MPa. In this study, with the aim of evaluating the accuracy and adequacy of these parameters for high-strength prestressed concrete, the stress-strain curve and equivalent stress block parameters were calculated throughout the entire loading process. To achieve this, a simplified third-degree polynomial stress-strain relationship was proposed and compared with experimental data for both compressed (high-strength) and non-compressed (normal-strength) concretes. The results demonstrated that the proposed model has acceptable accuracy in predicting the actual behavior of both compressed and non-compressed concretes, and it can be used to derive instantaneous parameters of the stress block. The obtained stress block parameters were compared with code-based relationships and previous studies, revealing that certain code assumptions require modification when applied to high-strength concrete. | ||
| کلیدواژه‌ها | ||
| Stress block؛ Structural design؛ Compressed concrete؛ High-strength concrete؛ Prediction | ||
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آمار تعداد مشاهده مقاله: 20 |
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