SP 24-1978 is a design aid for the Indian standard code of practice for plain and reinforced concrete, say IS 456-2000. This code is divided into 6 sections and 5 appendices, covering both, limit state design and working stress method as well.
You can download SP 24-1978 in pdf form here
SP 24-1978 provides a detailed explanation and could be used as a handbook for IS 456-2000
You can download relevant IS Codes from the following list.
- IS 13920-2016, code of practice for ductile detailing of earthquake resistant structures
- IS 4326-2013 earthquake resistant design of structures