Response reduction factor for ductile shear wall with special RC moment resisting frame as per IS 1893 (part 1):2002 is:
5
Response Reduction Factor for Seismic Design
The response reduction factor, denoted as \(R\), is a key parameter used in the seismic design of structures according to IS 1893 (Part 1):2002. This factor accounts for the inherent strength, ductility, and redundancy present in a building system, which enables it to dissipate seismic energy through inelastic deformation without catastrophic failure. A higher \(R\) factor implies that the structure possesses greater energy absorption capacity, thereby allowing for a reduction in the calculated design seismic forces.
IS 1893 (Part 1):2002, the Indian Standard Criteria for Earthquake Resistant Design of Structures, provides specific values for the \(R\) factor for various types of structural systems in its Table 7. These values are crucial for engineers to accurately determine the lateral forces that a structure must be designed to withstand during an earthquake.
IS 1893 (Part 1):2002 Table 7 Reference for R Factor
To determine the response reduction factor for a "ductile shear wall with special RC moment resisting frame", we refer directly to Table 7 of IS 1893 (Part 1):2002. This table explicitly lists different structural systems and their corresponding \(R\) values. The relevant entry for the specified structural system is as follows:
| S. No. | Type of Structural System | Response Reduction Factor \(R\) |
|---|---|---|
| 1 | Moment Resisting Frame (MRF) | |
| a) Ordinary RC Moment Resisting Frame (OMRF) | 3.0 | |
| b) Special RC Moment Resisting Frame (SMRF) | 5.0 | |
| 2 | Building with RC structural walls (shear walls) | |
| a) Ordinary RC shear walls | 3.0 | |
| b) Ductile shear walls | 4.0 | |
| 3 | Building with ductile shear walls and special moment resisting frames (SMRF) | 5.0 |
Factor for Ductile Shear Walls and SMRF Combination
As per the information provided in IS 1893 (Part 1):2002, specifically from Table 7, for a building with a structural system comprising a ductile shear wall in combination with a special RC moment resisting frame (SMRF), the assigned response reduction factor is 5.0. This corresponds to S. No. 3 in the table.
This higher \(R\) value for such a combined system acknowledges its enhanced seismic performance. The combination of ductile shear walls and special RC moment resisting frames provides a robust and resilient structure capable of withstanding significant seismic events by distributing and dissipating earthquake energy effectively through ductile behaviour.
Therefore, the response reduction factor for a ductile shear wall with special RC moment resisting frame as per IS 1893 (Part 1):2002 is 5.
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