structural design notes
TRANSCRIPT
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STRUCTURAL DESIGN
Notes
Submitted by :
Tanya Pahwa
2K6/Arch./628
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ASSIGN ON STEEL REINFORCEMENT
• What is the purpose of providing cover to the reinforcement? Give the value of clear cover for mild exposure conditions for slabs, beams, columns, footings.
• What is the difference between clear cover and effective cover to the reinforcement?
• What is the diff between overall depth and effec depth of an RCC beam. Why effec depth and not overall depth is adopted in the design of beams?
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TABLE OF FLEXURE-REINFORCEMENT % FOR DOUBLY REINF SECTIONSTABLE OF FLEXURE-REINFORCEMENT % FOR DOUBLY REINF SECTIONS
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WORKING STRESS METHOD M-20 CONC MIX
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1. Explain the terms: One-way slab, 2-way slab, clear span, effective span, overall depth, aspect ratio, simply supported slabs, continuous slabs, cantilever slabs.
2. Give expressions for BM along short and long span of a simply supported slab of span lx=4m, ly=6m and loaded with a udl of w KN/m2.
Calc Mx and my if w=10 KN.m2.
3. Define Aspect Ratio. Explain why two-way slabs with aspect rate>=2.0 are generally designed as 1-way slabs?
4. Give general rules for detailing of reinforcement in RCC slabs.
5. Sketch typical 2-way slab, 2-way cont. slab, cantilever slabs.
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• Rules for providing stirrups in beams:
– Dia. 8mm, 10mm, 12mm(rare). 2 or multilegged.
– Designed to resist shear force in beam members.
– As SF in a beam is max. at supports, spacing of stirrups is less at supports and increases at mid span.
– Max spacing of stirrups=0.75d; d=effec depth of beam
– For seismic areas, max spacing up to a distance of 2d from supports=d/4. For remaining portion of beam max spacing=d/2.
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