Passive Earth Pressure Resistance on Bridge Abutment
Passive Earth Pressure Resistance on Bridge Abutment
(OP)
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 the abutment is 'pushed' into the backfill. I currently have gap springs setup with the correct stiffness but is seems they also provide resistance in tension when the abutment moves away from the backfill, which is not what I want. I have foundation springs setup to replicate pile foundations at 40kip/in/pile in both transverse and longitudinal directions.
any ideas?
Thanks
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 the abutment is 'pushed' into the backfill. I currently have gap springs setup with the correct stiffness but is seems they also provide resistance in tension when the abutment moves away from the backfill, which is not what I want. I have foundation springs setup to replicate pile foundations at 40kip/in/pile in both transverse and longitudinal directions.
any ideas?
Thanks





RE: Passive Earth Pressure Resistance on Bridge Abutment
RE: Passive Earth Pressure Resistance on Bridge Abutment
thanks, i just checked that and both the load case and the gap link are checked as nonlinear already.
RE: Passive Earth Pressure Resistance on Bridge Abutment
By chance, did you also assign a spring or another link at the same location which could be acting in tension and compression?
RE: Passive Earth Pressure Resistance on Bridge Abutment
RE: Passive Earth Pressure Resistance on Bridge Abutment
RE: Passive Earth Pressure Resistance on Bridge Abutment
I may have to change from using a gap link to a multilinear elastic link to provide more representative results for passive earth pressureresistance. as deformation increases the stiffness of the soil decreases. To do this I plan to define the different stiffnesses (deformation vs force) for the compression direction and 0 stiffness for the tension direction. i need to then apply this to both abutments. what are your thoughts on this procedure?
thanks
RE: Passive Earth Pressure Resistance on Bridge Abutment