IRC 112-2011-1

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  INDIAN HIGHWAYS, OCTOBER 201349    I   R  C Amendment No. 1/August, 2013/IRC:112-2011 toIRC:112-2011 “Code of Practice for Concrete Road Bridges” S. No.Clause No.ForRead 1Clause 10.1Page No. 80Add following sub Para:For concrete of grades higher than M60, the shear strength shall be limited to that of strength grade M60 for design purpose.2Clause 10.3.1  NotationPage : 86Page: 87Page: 88  f   ywd   = Design strength of web reinforcement used to resist shear limited to 0.8 f  yk  /g m . v 1  is a strength reduction factor.1. Value is given by v 1  ≈  v . Where v  is given by Eq. 10.6.2. If design stress of shear reinforcement is  below 80 percent of  f   yk   value of v 1  can be taken as : v 1  = 0.6 for  f  ck    ≤  80 MPa= 0.9 –  f  ck  250  > 0.5 for   f  ck   > 80 MPa  f   ywd   = Design strength of web reinforcement to resist shear =  f   yk m γ v 1  = v  is a strength reduction factor for concrete cracked in shear, given in Eq. 10.6.DeleteDelete310.3.3.2: Members with vertical Shear reinforcementPage No. 91  f   ywd   = Design strength of web reinforcement used to resist shear limited to 0.8  f   ywk  v 1  is a strength reduction factor for concrete cracked in shear: v 1  = 0.6 for  f  ck    ≤  80 MPa v 1  = 0.9 –  f  ck  250  > 0.5 for  f  ck   > 80 MPaIf   v 1  = v , then value of 0.67  f   yk   can be used.  f   ywd   is the design strength of web reinforcement to resist shear =  f   yk m γ v 1  = v  is a strength reduction factor for concrete cracked in shear given in Eq 10.6.DeleteDeleteDelete  50INDIAN HIGHWAYS, OCTOBER 2013    I   R  C AMENDMENT TO IRC:112-2011 S. No.Clause No.ForRead 45.3.2.5 Limit State of Fatigue Page No. 21The bridge or any of its components shall not loose its capacity to carry design loads  by virtue of its materials reaching fatigue limits due to its loading history. Note :  For structures designed as per this Code, the effects of fatigue due to action of live loads on concrete need not be taken into account, unless otherwise speci fi ed. The bridge or any of its components shall not lose its capacity to carry design loads by virtue of its materials reaching fatigue limits due to its loading history. For carrying out fatigue veri fi cation, specialist literature may  be referred. However, fatigue veri fi cation is not necessary for the following:a) For Reinforced concrete structures when the stress in the tensile reinforcement is less than 300 MPa under Rare Combination of Serviceability Limit State as against 0.8 f  y  speci fi ed in clause no. 12.2.2.  b) For prestressed concrete structures under the frequent combination of action and  prestressing force, only compressive stresses occur at the extreme concrete fi  bers, under Serviceability Limit State. S. No.Figure No. & Page No.ForRead 5.Figure 6.1 (b) (Page 29) (b) Hot Rolled/Heat Treated HYSD Steel   f  yk   --- (b) Hot Rolled/Heat Treated HYSD Steel
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