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thanx for mentioning PCA notes Rana sab i had them but now used , thanx for sharing the articles umar bhai.

W.Salaam.An excellent question. Ductility in beams can be studied easily be considering the moment-curvature relationship and basic beam formula, C=T. Over reinforced sections have insignificant section ductility as no yielding would be there. With the increase in reinforcement ratio , strain in reinforcement decreases and the depth of neutral axis increases, resulting in a lesser value of section ductility. Same is true for condition in which value of Fy is increased and all other parameters are kept constant. Thanks.

Please refer to UBC-97 1633.2.7, The issue is not pertaining to the best among them, designer has limitations to adopt framing as per code. once one meets the minimum code criteria then it is always a good engineering practice to adopt the most efficient design which generally may be achieved by having stability on minimum codal requirements.

Aslam Kassimali's book can also be consulted. You can find it on this link: https://skydrive.live.com/redir?resid=35DD3B5349D6D025!3299&authkey=!ACpYP6NJabY6gHw&ithint=file%2c.pdf