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68
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Approximate bend points or cutoff for bars:
ƚ ůĞĂƐƚ ͕ ŽŶĞ ʹ ƚŚŝƌĚ ƚŚĞ ĂƌĞĂ ŽĨ ƉŽƐŝƚŝǀĞ ŵŽŵĞŶƚ ƌĞŝŶĨŽƌĐĞŵĞŶƚ ŝŶ ƐŝŵƉůĞ ŵĞŵďĞƌ ĂŶĚ
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ŝŶƚŽ ƚŚĞ ƐƵƉƉŽƌƚƐ ͘
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ĞƐŝŐŶ ƚŚĞ ƐůĂď ͕ ĨŝŶĚ ƚŚĞ ƐŝnjĞ ĂŶĚ ƚŚĞ ƐƉĂĐŝŶŐ ŽĨ ƚŚĞ ƌĞŝŶĨŽƌĐĞŵĞŶƚ͘
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9 ĞŶĚŝŶŐ ŵŽŵĞŶƚ Ăƚ ĞdžƚĞƌŝŽƌ ƐƵƉƉŽƌƚ
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9 ƚ ĞdžƚĞƌŝŽƌ ƐƵƉƉŽƌƚ

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Design of one way slab exampe

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  • 4. 70 ŽŶƚŝŶƵŽƵƐ ƐůĂď ͗ 9 ^ŝŵƉůLJ ƐƵƉƉŽƌƚ ƐůĂď͗ с Ŷ н ĚĞƉƚŚ ŽĨ ƚŚĞ ƐůĂď с Ŷ н ď ǁ с Ŷ н ϮŚ Ĩ ^ŵĂůůĞƌ Ăƌ ƐƉĂĐŝŶŐ ĂŶĚ ĐŽŶĐƌĞƚĞ ĐŽǀĞƌ ; ĐŽĚĞ ϳ͘ϲ͘ϱ Ϳ͗ 9 Žƌ ŵĂŝŶ ƌĞŝŶĨŽƌĐĞŵĞŶƚ ^ ;ŵĂdžͿ ч ϯŚ ч ϰϲϬŵŵ 9 Žƌ ƚĞŵƉĞƌĂƚƵƌĞ ĂŶĚ ƐŚƌŝŶŬĂŐĞ ^ ;ŵĂdžͿ ч ϱŚ ч ϰϲϬŵŵ ŽŶĐƌĞƚĞ ĐŽǀĞƌ͗ 9 EŽƚ ĞdžƉŽƐĞĚ ƚŽ ǁĞĂƚŚĞƌ Žƌ η ϯϱŵŵ ĂŶĚ ƐŵĂůůĞƌ ฺ ϮϬŵŵ Žƌ η ϰϱŵŵ ĂŶĚ η ϱϮ ฺ ϰϬŵŵ 9 ĞdžƉŽƐĞĚ ƚŽ ǁĞĂƚŚĞƌ Žƌ η ϭϲŵŵ ĂŶĚ ƐŵĂůůĞƌ ฺ ϰϬŵŵ Larger # 16 ฺ 50mm ĞŶĚŝŶŐ ŵŽŵĞŶƚ ĂŶĚ ^ŚĞĂƌ ĨŽƌĐĞ ŝŶ ŽŶĞ ǁĂLJ ƐůĂďƐ ĂŶĚ ĐŽŶƚŝŶƵŽƵƐ ďĞĂŵƐ͗ dŽ ĨŝŶĚ ďĞŶĚŝŶŐ ŵŽŵĞŶƚƐ ĂŶĚ ƐŚĞĂƌ ĨŽƌĐĞƐ ͕ĂƉƉƌŽdžŝŵĂƚĞ ŽĞĨĨŝĐŝĞŶƚƐ ŵĂLJ ďĞ ƵƐĞĚ ŝĨ ƚŚĞ ĨŽůůŽǁŝŶŐ ĐŽŶĚŝƚŝŽŶƐ ĂƌĞ ƐĂƚŝƐĨŝĞĚ ͗ 9 ĚũĂĐĞŶƚ ĐůĞĂƌ ƐƉĂŶƐ ŵĂLJ ŶŽƚ ĚŝĨĨĞƌ ŝŶ ůĞŶŐƚŚ ďLJ ŵŽƌĞ ƚŚĂŶ ϮϬй ŽĨ ƚŚĞ ƐŚŽƌƚĞƌ ƐƉĂŶ ͘ 9 dŚĞ ƌĂƚŝŽ ŽĨ ůŝǀĞ ůŽĂĚ ƚŽ ĚĞĂĚ ůŽĂĚ ŵĂLJ ŶŽƚ ĞdžĐĞĞĚƐ ϯ͘ ࡸǤ ࡸ ࡰǤ ࡸ ൑ ૜ 9 dŚĞ ůŽĂĚ ŵƵƐƚ ďĞ ƵŶŝĨŽƌŵůLJ ĚŝƐƚƌŝďƵƚĞĚ͘
  • 5. 71 / K ĐŽĞĨĨŝĐŝĞŶƚƐ ĂŶĚ ĞƋƵĂƚŝŽŶƐ ĨŽƌ ƐŚĞĂƌ ĂŶĚ ŵŽŵĞŶƚ ĨŽƌ ĐŽŶƚŝŶƵŽƵƐ ďĞĂŵƐ͕ ŐŝƌĚĞƌƐ͕ ĂŶĚ ŽŶĞ ǁĂLJ ƐůĂďƐ
  • 6. 72 Approximate bend points or cutoff for bars: ƚ ůĞĂƐƚ ͕ ŽŶĞ ʹ ƚŚŝƌĚ ƚŚĞ ĂƌĞĂ ŽĨ ƉŽƐŝƚŝǀĞ ŵŽŵĞŶƚ ƌĞŝŶĨŽƌĐĞŵĞŶƚ ŝŶ ƐŝŵƉůĞ ŵĞŵďĞƌ ĂŶĚ ŽŶĞ ʹ ĨŽƵƌƚŚ ŽĨ ƉŽƐŝƚŝǀĞ ŵŽŵĞŶƚ ƌĞŝŶĨŽƌĐĞŵĞŶƚ ŝŶ ĐŽŶƚŝŶƵŽƵƐ ŵĞŵďĞƌƐ ŵƵƐƚ ĞdžƚĞŶĚ ŝŶƚŽ ƚŚĞ ƐƵƉƉŽƌƚƐ ͘
  • 7. 73 džĂŵƉůĞ͗ $ RQH ʹ ZD VLQJOH ʹ VSDQ UHLQIRUFHG FRQFUHWH VODE KDV D FOHDU VSDQ RI P DQG FDUULHV DOLYH ORDG RI .1Pϸ DQG D GHDG ORDG RI .1Pϸ LQ DGGLWLRQ WR LWV VHOI ZHLJKW 'HVLJQ WKH VODE ILQG WKH VL]H DQG VSDFLQJ RI UHLQIRUFHPHQW I ′′′′F 0SD I 0SD 6ROXWLRQ
  • 8. 74 ŚĞĐŬ ĨŽƌ ƐŚĞĂƌ KZ ϯϭ͘Ϯϰч ϵϳ͘ϴϲ ŽŬ͘ džĂŵƉůĞ͗ ƌĞŝŶĨŽƌĐĞĚ ĐŽŶĐƌĞƚĞ ƐůĂď ŝƐ ďƵŝůƚ ŝŶƚĞŐƌĂůůLJ ǁŝƚŚ ŝƚƐ ƐƵƉƉŽƌƚƐ ĂŶĚ ĐŽŶƐŝƐƚ ŽĨ ƚǁŽ ĞƋƵĂů ƐƉĂŶ ĞĂĐŚ ǁŝƚŚ ĐůĞĂƌ ƐƉĂŶ ŽĨ Ŷсϰŵ ĂƐ ƐŚŽǁŶ ŝŶ ĨŝŐ͘ dŚĞ ƐĞƌǀŝĐĞ ůŝǀĞ ůŽĂĚ ŝƐ ĞƋƵĂů ϱ͘ϳϯEͬŵϸ͘ ĞƐŝŐŶ ƚŚĞ ƐůĂď ͕ ĨŝŶĚ ƚŚĞ ƐŝnjĞ ĂŶĚ ƚŚĞ ƐƉĂĐŝŶŐ ŽĨ ƚŚĞ ƌĞŝŶĨŽƌĐĞŵĞŶƚ͘ I′′′′F 0SD I 0SD ^ŽůƵƚŝŽŶ͗ dŽ ĚĞƚĞƌŵŝŶĞ ƐŚĞĂƌ ĂŶĚ ; ͘D Ϳ ƉƉƌŽdžŝŵĂƚĞ ĐŽĞĨĨŝĐŝĞŶƚƐ ŵĂLJ ďĞ ƵƐĞĚ ; ƐĞĞ / ĐŽĚĞ ϴ͘ϯ Ϳ ŝĨ͗ 9 ^ƉĂŶƐ ĂƌĞ ĞƋƵĂů
  • 9. 75 9 dŚĞ ůŽĂĚ ŝƐ ƵŶŝĨŽƌŵůLJ ĚŝƐƚƌŝďƵƚĞĚ ƉƉƌŽdžŝŵĂƚĞ ĐŽĞĨĨŝĐŝĞŶƚƐ ; / ĐŽĚĞ ϴ͘ϯͿ 9 ĞŶĚŝŶŐ ŵŽŵĞŶƚ Ăƚ ĞdžƚĞƌŝŽƌ ƐƵƉƉŽƌƚ 9 ĞŶĚŝŶŐ ŵŽŵĞŶƚ Ăƚ ŵŝĚ ƐƉĂŶ 9 ĞŶĚŝŶŐ ŵŽŵĞŶƚ Ăƚ ŝŶƚĞƌŝŽƌ ƐƵƉƉŽƌƚ hƐŝŶŐ η ϭϮ ďĂƌƐ 9 ƚ ŝŶƚĞƌŝŽƌ ƐƵƉƉŽƌƚ 9 ƚ ŵŝĚ ƐƉĂŶ 9 ƚ ĞdžƚĞƌŝŽƌ ƐƵƉƉŽƌƚ
  • 10. 76 WƌŽǀŝĚĞĚ η ϭϮ Λ ϮϱϬŵŵ Ăƚ ŵŝĚ ƐƉĂŶ ĞŶĚ ƵƉ ϱϬй ŽĨ ƚŚŝƐ ďĂƌ ĨŽƌ ŶĞŐĂƚŝǀĞ ƌĞŝŶĨŽƌĐĞŵĞŶƚ ĂŶĚ ƚŚĞ ƐĂŵĞ ĂŵŽƵŶƚ ŽĨ ƐƚĞĞů ĨƌŽŵ ĂĚũĂĐĞŶƚ ƉĂŶĞů͕ ƚŽƚĂů ĂƌĞĂ ŽĨ ƐƚĞĞů͘ 9 ŝƐĐŽŶƚŝŶƵŽƵƐ ĞĚŐĞƐ ͗ 9 ŚĞĐŬ ĨŽƌ ƐŚĞĂƌ͗