Name: sizing steel bars for a concrete beam
Uploaded: 2024-11-07T14:48:55.000Z
Duration: 1 min 22 s
Channel: JoVE

K12 Standards

Texas Essential Knowledge and Skills

High School

Biology

BIO.2

BIO.2.D

design-example-distributing-reinforcements-in-concrete-sections

Design Example: Distributing Reinforcements in Concrete Sections

חשבו על חתך קורת בטון שעבורו חתך החיזוק הנדרש שווה ל-4 אינץ' מרובע בהתאם לתכנון החיזוק.
ברים בקוטר נומינלי של 1.693 אינץ' זמינים במלאי.
כעת, על המהנדס להתאים את הסורגים בקוטר זמין כדי לעמוד בשטח חתך הפלדה הרצוי של ארבעה אינצ'ים רבועים.
שטח החתך של מוט בקוטר 1.693 אינץ' הוא 2.25 אינץ' מרובע, ומספר הסורגים יהיה 1.777. מספר זה יעוגל למספר השלם הקרוב ביותר, כלומר 2.
שטח החתך הכולל של 2 הפסים בקוטר 1.693 אינץ 'יהיה שווה ל -4.5 אינץ 'מרובע.
שטח חתך נוסף של 0.5 אינץ 'מרובע מסופק כדי לפגוש את חתך הרצוי עם הסורגים הזמינים.
אם למלאי הזמין יש מוטות בקוטר השווה ל -1.128 אינץ ', אז שטח החתך של סרגל זה הוא 1 אינץ 'מרובע, כלומר בדיוק 4 ברים יספיקו לדרישות העיצוב של חתך הפלדה.

דוגמה לתכנון: חלוקת חיזוקים במקטעים מבטון

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הנושא בוחן את ההיבטים המעשיים של התאמת חיזוקי פלדה בתוך קורת בטון על מנת לעמוד בדרישות תכנון ספציפיות. בתכנון קורת בטון מזוין, חשוב לחלק את הפלדה המזוינת בצורה נכונה כדי להבטיח שלמות מבנית ויעילות. הדוגמה המובאת מתארת מצב שבו נדרשת שטח חתך כולל של 25.81 סנטימטרים רבועים של פלדה. המהנדס מזהה כי מוטות הפלדה הזמינים הם בקוטר נומינלי של 4.30 סנטימטרים, וכל אחד מהם מציע שטח חתך של 14.52 סנטימטרים רבועים.

חישוב מספר הברזל הנדרש נותן מספר שאינו שלם, שיש לעגל כלפי מעלה למספר השלם הקרוב ביותר, מה שמוביל לעודף קל בכמות הפלדה המסופקת. לחלופין, אם משתמשים במוטות פלדה בקוטר של 2.87 סנטימטרים, 4 מוטות יענו במדויק על הדרישה שכן כל מוט תורם 6.45 סמ"ר אחד לשטח החתך. תרחיש זה מדגיש את החשיבות של בחירת גודל המוטות ומספר הברזלים המתאים על מנת לעמוד בדרישות התכנון מבלי לגרום לבזבוז חומר משמעותי או פגיעה במבנה. החלטות מסוג זה הן קריטיות בפרויקטי בנייה לשמירה על מגבלות התקציב ולהבטחת בטיחות מבנית. תכנון וחישוב מדויק מאפשרים שימוש יעיל בחומרים תוך עמידה בסטנדרטים הנדסיים.
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ניקח לדוגמה חתך קורת בטון שעבורו חתך החיזוק הנדרש שווה ל-4 אינץ' מרובע בהתאם לחיזוק ...

Education

JoVE Core

Civil Engineering

הנדסה אזרחית

Unit 1

יחידה 1

Design Examples

דוגמאות לעיצוב

KEY TERMS AND CONCEPTS

מונחים ומושגים מרכזיים

sizing steel bars for a concrete beam

Sizing steel bars for a concrete beam helps meet a required reinforcement area. In reinforced concrete design, the steel must be arranged so the beam stays strong and uses material efficiently. This example uses a beam that needs a total steel cross-section of 4 square inches.

The available bars in the example have a nominal diameter of 1.693 inches. Each bar provides a cross-sectional area of 2.25 square inches. When the engineer divides the required area by the area of one bar, the result is not a whole number.

That answer must be rounded up to the next whole bar, so the beam receives a small amount of extra steel. The example also shows a second option. Bars with a diameter of 1.128 inches each provide 1 square inch of cross-sectional area, so 4 bars meet the 4-square-inch requirement exactly.

This comparison shows why bar size and bar count matter in concrete beam design. Choosing the right combination can reduce wasted material and still meet the design specification. These calculations help support structural safety and budget control in construction projects.

Sizing Steel Bars for a Concrete Beam

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design example: distributing reinforcements in concrete sections

Sizing steel bars for a concrete beam helps meet a required reinforcement area. In reinforced concrete design, the steel must be arranged so the beam stays strong and uses material efficiently. This example uses a beam that needs a total steel cross-section of 4 square inches. The available bars in the example have a nominal diameter of 1.693 inches. Each bar provides a cross-sectional area of 2.25 square inches. When the engineer divides the required area by the area of one bar, the result is...

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key terms and concepts

See how engineers choose steel bar size and count to meet a 4-square-inch reinforcement target in a concrete beam while limiting waste and meeting design needs.

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Sizing Steel Bars for a Concrete Beam

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