1. Department of Civil Engineering NED University Engineering & Technology Building Prof Sarosh Lodi

2. Department of Civil Engineering NED University Engineering & Technology TOPICS COVERED  Intro

3. Department of Civil Engineering NED University Engineering & Technology FLEXURAL MEMBERS OF SMRF General  Clear span not less than 4 times effective depth  Width/depth ratio not less than 0.3  Width not less than 10 in  Width not more than width of supporting member plus distance on each side of supporting member equal to ¾ of the depth of flexural member Cont.

4. Department of Civil Engineering NED University Engineering & Technology FLEXURAL MEMBERS OF SMRF Longitudinal Reinforcement  Reinforcement ratio not less than 200/fy  Reinforcement ratio not more than 0.025  Two bars should be continuous in top and bottom  +ve moment strength at joint face should not be less than ½ of –ve moment strength  +ve or –ve moment strength at any section should not be less than ¼ of strength at joint face  Lap allowed only with hoop or spiral reinforcement  Lap splices are not allowed  within joints  a distance of 2d from joint face

5. Department of Civil Engineering NED University Engineering & Technology FLEXURAL MEMBERS OF SMRF Longitudinal Reinforcement

6. Department of Civil Engineering NED University Engineering & Technology FLEXURAL MEMBERS OF SMRF Transverse Reinforcement  Maximum hoop spacing shall not exceed  d/4  8 times dia of smallest longitudinal bar  24 times dia of hoop bar  12 in  Examples of hoops are Cont.

7. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF General  Shortest cross-sectional dimension is 12 in.  Ratio of shortest dimension to perpendicular dimension shall not be less than 0.4

8. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF Reinforcement  Longitudinal reinforcement ratio not less than 0.01 and not more than 0.06  Concrete cover for transverse reinforcement shall not exceed 4 in.  Spacing of rings (s) shall not exceed  s=¼ of minimum column dimension  s=6 times dia of longitudinal bar  s=4+[(14-hx)/3] 4”< s <6”  Length of column (L) for above ring spacing shall not be less than  depth of column  1/6 of clear span  18 in.

9. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF Reinforcement  Spacing (S1) for the rest of column length is smaller of  6 times longitudinal bar dia  6 in.  Example of rings is

10. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF

11. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF

12. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF

13. Department of Civil Engineering NED University Engineering & Technology COLUMNS FOR SMRF Joints  Beam longitudinal reinforcement must be extended to the far face of column and anchored  Column dimension parallel to the beam reinforcement not be less than 20 times bar dia  Transverse reinforcement shall be provided in joint

14. Department of Civil Engineering NED University Engineering & Technology INTERMEDIATE MOMENT RESISTING FRAME Beams  +ve moment strength at joint face should not be less than 1/3 of –ve moment strength  +ve or –ve moment strength at any section should not be less than 1/5 of strength at joint face  First hoop provided at 2 in. from face of support  Maximum hoop spacing shall not exceed  d/4  8 times dia of smallest longitudinal bar  24 times dia of hoop bar  12 in

15. Department of Civil Engineering NED University Engineering & Technology INTERMEDIATE MOMENT RESISTING FRAME Columns  Hoops provided at spacing (s) over length (L) from both ends  s should be smallest of  8 times dia of smallest longitudinal bar  24 times dia of hoop bar  ½ of smallest dimension of frame member  12 in  L should be largest of  1/6 of clear span of column  Minimum dimension of column  18 in

16. Department of Civil Engineering NED University Engineering & Technology INTERMEDIATE MOMENT RESISTING FRAME Columns  Hoops provided at spacing (s) over length (L) from both ends  s should be smallest of  8 times dia of smallest longitudinal bar  24 times dia of hoop bar  ½ of smallest dimension of frame member  12 in  L should be largest of  1/6 of clear span of column  Minimum dimension of column  18 in