दी गई (चित्र में) आयताकार एकल प्रबलित RCC बीम के लिए IS 456: 2000 द्वारा अनुमत तनाव सुदृढीकरण का न्यूनतम क्षेत्रफल निर्धारित करें। सुदृढीकरण इस्पात ग्रेड Fe500 है।

3-5-2025 IMG-1200 Ashish Verma -2

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BHEL Engineer Trainee Civil 24 Aug 2023 Official Paper
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  1. 4400 mm2
  2. 187 mm2
  3. 170 mm2
  4. 225 mm2

Answer (Detailed Solution Below)

Option 3 : 170 mm2
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संप्रत्यय:

न्यूनतम तनाव सुदृढीकरण:

\(\frac{{{A_{st\ min}}}}{{b\; ×\; d}} = \frac{{0.85}}{{{f_y}}}\)

जहाँ,

Ast min = न्यूनतम तनाव सुदृढीकरण, b = बीम की चौड़ाई, d = बीम की गहराई, fy = इस्पात की उपज शक्ति, D = कुल गहराई

अधिकतम तनाव सुदृढीकरण:

IS 456 के अनुसार बीम में तनाव सुदृढीकरण का अधिकतम क्षेत्रफल कुल क्षेत्रफल का 4% से अधिक नहीं होना चाहिए अर्थात 0.04bD।

परिकलन:

दिया गया है, b = 250 mm, d = 400 mm, D = 440, fy = 500 N/mm2

न्यूनतम तनाव सुदृढीकरण:

\(\frac{{{A_{st\ min}}}}{{b\; ×\; d}} = \frac{{0.85}}{{{f_y}}}\)

\({{{A_{st\ min}}}} = \frac{{0.85\;×\; {{b \;×\; d}}}}{{{f_y}}}\)

\({{{A_{st\ min}}}} = \frac{{0.85\;×\; {{250\; ×\; 400}}}}{{{500}}}\)

\({{{A_{st\ min}}}} = 170 \ mm^2\)

 

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