Danny Villalpando's Activities

OpenBridge Designer (LEAP Bridge Concrete Substructure): Long term Deflections and Cracked Sections

Danny Villalpando — Fri, 30 Jun 2023 00:08:49 GMT

Good afternoon,

When performing second-order analysis, does the program account for cracked section properties when computing deflections or does the user need to apply a factor of reduced moment of inertia separately for both cap and columns?

Also does the program consider long term effects for deflection? Such as deflections due to creep?

Thanks,

Danny

OpenBridge Designer (LEAP Bridge Concrete Substructure): Modeling Top of Column as Pinned (Free to rotate about Z axis, but fixed about X and Y axis)

Danny Villalpando — Tue, 27 Jun 2023 17:24:07 GMT

Good afternoon,

Is there a way to model top of columns as a partially pinned connection (pinned in the transverse direction only - free to rotate about the z axis, but fixed about the x and y axis)?

I am aware that an option exists to model the bent cap as continuous beam resting on knife edge supports, but do not see an option to design the columns for moment and shear.

Any help is appreciated.

Thanks,

Danny

Thermal force calculation with bearing pad for multi-column interior bent with varying column heights

Danny Villalpando — Tue, 06 Dec 2022 17:40:15 GMT

Hello, I have a couple questions regarding OpenBridge Designer (LEAP Bridge Concrete Substructure).

- How is the thermal force calculated for a multi-column bent with elastomeric bearing pads with varying column heights?

- Also, how is the out-of-plane stiffness calculated for a multi-column bent with varying column heights supporting girders on elastomeric bearing pads?

- Lastly, how is the out-of-plane stiffness calculated for a multi-column bent with different column and drilled shaft diameters to the point of fixity?

Thanks,

Danny V

Effective Shear Depth of ROUND CONCRETE COLUMNS

Danny Villalpando — Wed, 22 Jun 2022 23:03:24 GMT

How is the effective shear depth calculated for round concrete columns in LeapBridgeConcrete (substructure design)? I have a 3' round column with a 3" clear cover, #4 spirals and #9 longitudinal bars. The program calculated the effective shear depth to be 26.51". As per AASHTO, the effective shear depth for round columns shall be taken as the max of (0.9de or 0.72h), where de = diameter of column/2 - Dr/pi. The values equate to the max of (0.9*26.87", 0.72*36") = max of (24.18", 25.92") = 25.92"

Is there something i am missing?

Thanks,

Beta Factor - Self Weight

Danny Villalpando — Wed, 01 Apr 2020 14:35:34 GMT

In Leap Bridge Concrete (RCPier), for the substructure design of an abutment, the beta factor for self-weight is set to 0 for multiple limit states. See screenshot below.

However, after analyzing the substructure, it seems as if the self weight load case is considered. Im not sure if the self weight is perhaps included in the DC load case.

Could you please verify if the beta factors are correct? Also, to avoid confusion, can the beta factors be shown correctly in future versions?

Thanks,

Danny V

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