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Capacity design - RM Bridge

Ivana Tadic
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Question regarding the seismic ductile behavior of bridges, i.e. q>1.5:

Consider a case when behavior factor q=3 is used for the analysis of the bridge (ductile behavior). When performing Eurocode design checks for shear design of reinforced concrete pier, does RM automatically:

(1) calculates the capacity design effects for shear (so it is not anymore q=3) EN1998-2 5.6.3.3 (1)P a), and
(2) divides the shear capacity with additional safety factor gama,bd, EN1998-2 5.6.3.3 (1)P b);

Or an user needs to do some post-processing (multiplying further the RM output, outside of the software) to perform shear design of reinforced concrete piers?

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    Hi Ana,
     
    thank you for your response. I have additional questions, just to clarify:
     
    1. To confirm, ''ShearSup'' and '''ShearLC'' are load combinations automatically calculated with behaviour factor q=1?
     
    2. The value 1.25 - in the additional-safety-factor screenshot that you sent me in the red rectangle - is the only place in RM where gama,bd1 (from EN1998-2 5.6.3.3 (1)P) is defined?
     
    3. In Structure> Elements > Checks > Shear capacity checks, is the word ''capacity'' referred to the generic meaning of material resistance, or it means that shear effect is calculated in accordance with the seismic capacity design effect (increased values when compared with analysis with q=3) in accordance with EN1998-2 5.3 (1)P?
     
    Thank you for your time!
     
    Best regards,
    Ivana
     
     
  • 0 Offline in reply to Ivana Tadic

    Hi Ivana, 

    1. ''ShearSup'' and '''ShearLC'' are RM Bridge schedule actions to calculate the shear capacity check for certain combination of envelopes/superposition file chosen by the User. Superposition file can be the one calculated with behaviour factor q=1.

    2. Yes, it needs to be specified at the materials table.

    3. “Capacity” refers to material resistance.

    For more information about RM Bridge, please consult our Wiki pages:

    communities.bentley.com/.../rm-bridge-connect-edition

    Ana Carla Peres

    Senior Technical Support Engineer

    Bentley BrIM

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