SSC JE Civil Engineering 23-Mar-2021 Shift 1 Paper

Question : 139 of 200

Marks: +1, -0

In earth quake resistant design, response reduction factor (R) for steel special moment resisting frame (SMF) design as per IS 800 ∶ 2000 is:

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Solution:

Explanation:
Response reduction factor:
It is the factor by which the actual base shear force, that would be generated if the structure were to remain elastic during its response to the Design Basis Earthquake (DBE ) shaking, shall be reduced to obtain the design lateral force.
Response reduction factor for building systems:

Lateral Load Resisting System	R-Value
Building Frame Systems 1. Ordinary RC moment-resisting frame (OMRF) 2. Special RC moment-resisting frame (SMRF) 3. Steel frame with ● Concentric braces ● Eccentric braces 4. Steel moment-resisting frame designed as per SP 6 (6)	$\table 3;5;-;4;5;5$
Building with Shear Wall 5. Load bearing masonry wall buildings ● Unreinforced ● Reinforced with horizontal RC bands ● Reinforced with horizontal RC bands and vertical bars at corners of rooms and jambs of openings 6. Ordinary reinforced concrete shear walls 7. Ductile shear walls	$\table1.5;2.5;3;3;4$
Buildings with Dual Systems 8. Ordinary shear wall with OMRF 9. Ordinary shear wall with SMRF 10. Ductile shear wall with OMRF 11. Ductile shear wall with SMRF	$\table3;4;4.5;5$

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