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if you mean to say that we use different concrete section that is i) rectangular & ii) circular but keep the reinforcement and layout of reinforcement same what would be the effect rite? it will not matter much at normal scale in a normal building unless you have huge dimensions but anyway, ofcourse circular shape is more desireable due to archtectural reasons and also due to structural issues like circular cols will not have corner stress concentration less material as compared to square/rect cols but at the same time same moment of inertia equal capacity at every rotation of axis no matter from where the loading is coming

spiral reinforcement is better it has less capacity reduction factor hence more strength...but if you use circular ties it is same like rectangular ties..so in that case ties (rect or circular both are same)

believe me guyz! i have personal experience in this...but God saved me...cz the design which i had done by selecting SI units was conservative...it will always be! so it was not under designed...i found this mistake after spending continous 4 full nights on the issue! If any one interested i can provide him with full conversation to his personal email! but the summary is here --------------------- 1) If you use SI units it will report tension capacity of bolts in Mpa but the value will be still in ksi units! its the biggest confusion! although the shear value will be ok 2) If you use SI units it will not calculate the pull out and other concrete anchorage capacities correctly!

i think thats a very good idea...keep it up admin..we want to c new trends here unlike other forums!

Welcome ABBAS! we hope you will learn a lot here!

i have experience in making load combinations in etabs at quite complex level...believe it or not for some buildings i have made 200 ultimate and 200 service combinations...i really hate the etabs combination dialogue box which cannot be resized...unlike SAFE! where you can export it into excel! anyway this sheets i just designed for my own custom application...thought to share with you guyz if you find it helping..

This building promises to be tallest in Pakistan when completed. Project Description: Bahria Town Icon consists of two towers which are identical up to 8 floors i.e. 7 basements for car parking and 1 ground floor. Tower-1 comprises of 70 levels for office space and Tower-2 comprises of 30 floors for residential purpose. Client: AAA Partnership (Pvt.) Ltd. - Karachi. Location: Karachi. Architect: Arshad Shahid Abdullah (Pvt.) Ltd. - Karachi. Engineer: ESS-I-AAR - Karachi. (Structural) Beg Associates - Karachi. (Structural) WSP - UAE. (Structural) CFA: 2,230,500 m2; (24,000,000 ft2) Estimated Cost: USD 162.5 Million (PKR 13 Billion) START DATE April, 2010.