निम्नलिखित में से कौन सा भारतीय मानक ब्यूरो (IS) कोड विशेष रूप से पूर्व-प्रतिबलित कंक्रीट (prestressed concrete) के अभ्यास कोड के लिए समर्पित है?

For axial load and combined biaxial bending moment in the iteration formula used by IS 456, αn is based on Pu / Puz, where Puz is given by:

A compression member is considered to be short if its slenderness ratio satisfies which of the following conditions?