SAP2000 Analysis of a Bridge Bent
SAP2000 Analysis of a Bridge Bent
SAP2000 Analysis of a Bridge Bent
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Course No.: CE 511Mamun MiahGraduate StudentDept. <strong>of</strong> Civil Engineering
Objectives• To find the frequencies <strong>of</strong> a bent-pile system using<strong>SAP2000</strong>• To see the mode shapes <strong>of</strong> the system in <strong>SAP2000</strong>
Motivation• As a graduate student I have found my research interest inearthquake engineering• Currently, I am working on the investigation <strong>of</strong> I-55, US 78bridges (a MEMA Project) to see the adequacy <strong>of</strong> structuralsoundness during an earthquake <strong>of</strong> around 7.0 momentmagnitude• This presentation is a part <strong>of</strong> that project which satisfiesboth my course requirement and research goal
<strong>Bent</strong>-Pile SystemPile CapPilesI-55 Intermediate <strong>Bent</strong> System
Defining Section Properties in <strong>SAP2000</strong>Pile Cap SectionPile Section
Joint Restraints Assignment
Load Patterns and Assignments
Display <strong>of</strong> Joint LoadsLateral LoadDead Load
<strong>Analysis</strong>
Deformed ShapeLateral LoadDead LoadComb1= dead+lateral+liveModal
Reactions, Shears, and Moments
Modal Periods And Frequencies
Mode ShapesMode 1 Mode 2Mode 3 Mode 4
Mode Shapes (More)Mode 5Mode 6Mode 7 Mode 8
Conclusions• The mode shapes showed large compression andtension in the pile cap. In reality this is too stiff to becompressed or stretched like that.• The analysis is done in 2D whereas it should be donein 3D.
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