07-31-2010, 12:18 PM
P Delta Analysis
I am currently checking PEB Steel Building which was design by Etabs using ASD 89. The user specify Pdelta analysis and Use effectice length 1.0xL since @nd order analysis is performed. However, in Etabs ther is two options for Pdelta analyis, one is usimg mass based the other using load combinations. The user here, chooses Mass based and sets the factor for mass as 1.0. Is this correct? as i understand inthe ASD 89 you are require to set load factors to 1.6 if 2nd order is used and later apply the same division factor of 1.6 for the stress check. Under ASD, can you set the effective length to 1.0L? I know you can for LRFD. Anyone care to enlightened me??
I am currently checking PEB Steel Building which was design by Etabs using ASD 89. The user specify Pdelta analysis and Use effectice length 1.0xL since @nd order analysis is performed. However, in Etabs ther is two options for Pdelta analyis, one is usimg mass based the other using load combinations. The user here, chooses Mass based and sets the factor for mass as 1.0. Is this correct? as i understand inthe ASD 89 you are require to set load factors to 1.6 if 2nd order is used and later apply the same division factor of 1.6 for the stress check. Under ASD, can you set the effective length to 1.0L? I know you can for LRFD. Anyone care to enlightened me??