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I am applying vertical ground motions via non-linear time history analysis to a suite of single span bridges. to model the vertical properties of the bearing I am using a gap element to replicate the real world situation where there is virtually no resistance to uplift provided by the bearing...

Has anyone ever had CSIBridge or SAP2000 crash during an analysis and get either of the following messages? Link Link I am analyzing prestress i-girder bridges under 48 different ground motions using nonlinear modal time history. I have tried using both area object model and spine model. Also I...

It seems I have resolved this issue. Since I am running Non-linear Modal time history analysis each link element needs an appropriate linear stiffness defined in addition to the nonlinear stiffness value. By trial and error I arrived at a stiffness which gave realistic results for vertical...

Stressed, thanks for the input. Yes I did end up modeling the bearing as 2 separate links, one for the pad another for the dowels and it seems to be working. I was hoping that I would be able to combine them into one link due to the number of bridges I need to analyse. I am looking for any way...

Does anyone know what the best way to model this type of bearing is? It is a elasomeric pad with 2 steel dowels to prevent 'walking'. Figure 1 shows what I need to define. I have tried multilinear plastic link but did not get good results, my link definition is figure 2. Figure 1 Figure 2

Well i solved the problem of unexpected deformations, the foundation springs were incorrect. I had the vertical stiffness switched with the longitudinal stiffness. My ultimate goal is to model the bearing as a elastomeric pad with 2 steel dowels. To do this I am referencing a thesis done by...

I am subjecting a single span precast prestress concrete I-beam bridge to longitudinal ground motions. when i specify a stiffness for the bearings in the transverse direction, the abutment longitudinal displacement becomes smaller than expected. when the transverse bearing stiffness is set to...

there were a couple problems, first, I had the gap spring oriented in the wrong direction so your advice to display local axis helped with that. Next. the stiffness i had for the gap spring was small in comparison to the stiffness of the pile foundation springs, therefore the effect of the gap...

looks like i got it to work, thanks for the help!

Stressed, thanks, i just checked that and both the load case and the gap link are checked as nonlinear already.

Hello, I am modeling a single span prestressed I-beam bridge in CSI Bridge(Basically SAP2000). I am going to subject the model to ground motions using nonlinear time history analysis. I need a way to model the effect of the passive earth pressure resistance acting on the abutment backwall when...