Reliability of ASCE 41-13 equations to predict nonlinear behavior of URM In-plane walls

Thursday November 15, 2015

List of task to be completed by December 20, 2015

Tasks | Subtasks | deadlines | |

NSP in SAP2000, Yi et al. Experiment | Create model with only frames | ||

define Plastic Hinges in the model | |||

Apply plastic hinges to the model | |||

Apply SDL to the model | |||

Verify weight of the building | |||

Define loading protocol | |||

Create displacement load cases | |||

Run NL Gravity analysis, verify | |||

Apply protocol to roof and floor | |||

Run Loading protocol | |||

Compare to experiment | |||

Write up Report | Nov 29,2015 |

Model used to estimate axial loads in piers is based on 150928_M4.sdb.

name of the model=160107_M1.sdb

Pier 8, rocking and shear is consistent with MAEW-111124-1.xmcd.

What is rocking in URM walls? Is this rocking similar to Rocking as in Rigid Body Rocking? or is more like a flexural deformation capacity of the pier, similar to what happens in a RC column?. why do we have to use Moment curvature analysis to obtain the rotational capacity of the pier? Isnt more like a discrete-event, followed by toe-crushing?

Saturday January 9th, 2016

Shall we just include the controlling hinge in the model? or shall we include all possible failure modes?

Perhaps for linear analysis it does not really matter, but for nonlinear analysis it could....

we should double check both cases and conclude on this matter.

Model 160109_M1.sdb is the refined element model used to obtain the axial forces happening at the bottom of each pier. Groups were assigned and created and sections cut were defined using those group definitions.

Model 160109_M2.sdb is the equivalent model which needs to be updated so that the levels of axial forces in the piers are similar to those found in the previous model. One interesting finding is that the cross sections still have 12 inches as width, which is wrong. All sections in Wall 1 should have width=8 in or less.

What if we obtain the axial forces from the model without plastic hinges? Check Model 160109_M3.sdb ====> The previous model was correct!. It is that I was measuring the axial force in the wrong location.** so now we go back to work with 160109_M2.sdb.**