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Try reading 'Flexural Strength and Ductility of Extende Pile-Shafts' (I & II) by Chai and Hutchinson; Journal of Structural Engineering May 2002. Theories in the articles may help you.

rkillian, Try ASTM A354 Grade BD, it has Fu of 140ksi. I used this material for drilling rig pins of 3"-4" in diameter; and Fv=0.22Fu.

dougantholz, Sorry if I was not able expound my post. I presumed that DrewBur can get a copy of the SI report legally/ethically. Of course, he cannot use the report per se (even if he was able to get the permission of the SI report owner, etc.)for his project but he can have a good feel on the...

DrewBur, I you have soil investigation report of adjacent properties or areas, it is not necessary to conduct SI unless your constructing a 3 or more storeys high building. Also, for one or two storey buildings, the presumptuous allowable bearing capacity from local building codes can be...

drewtheengineer, Your inquiry is: To find the reaction on the middle support, could I just take half of the first span and half of the other span to determine the reaction or do I need to perform a continuous beam calculation? - No, you don't have to perform a continuous beam calculation if...

vbridge, You can refer to pp 613-620 of "Design of Steel Structures" by Gaylord, Gaylord, and Stallmeyer (3rd Edition) for answers.

Bannu I have personally seen structures (designed as frame without the infill walls) survived earthquakes here in my country, Philippines, and in Taiwan. They survived (i.e., did not collapse) because the building's infill walls are arranged almost symmetrically, there is no soft story, and the...