Midas Civil - RC Girder Design

Question:

Hi,

In the model, conventional RC beam is modeled as girder (section namely "RCgirder1") and crosshead beam (section namely "crosshead1~5").
  1. As shown in the "crosshead.jpg" & "rcgirder1.jpg", using RC design under eurocode is able to design "crosshead1~5" but it is unable to design "RCgirder1" (invalid member type & rebar data). Please enlighten us.
  2. we understand that we can study the result for each construction stage and finally design for the "post CS". But is it possible to design the member at particular construction stage? Eg. design for section namely "RCgirder1pre" during "CS2" due to unable to generate/ input load combination for construction stage.
3. The RC deck of the bridge is modeled as plate beam (1-D) because we didn't find any other function in Midas Civil to design for plate/ mesh member. Is it correct to use plate beam (1-D) to design as RC deck of bridge in our case?

Thanks


Hello,

It'd be a pleasure to help!  Following are the response:
1)  As shown in the "crosshead.jpg" & "rcgirder1.jpg", using RC design under eurocode is able to design "crosshead1~5" but it is unable to design "RCgirder1" (invalid member type & rebar data). Please enlighten us.
A:  Only the elements in XY plane are considered as beam for design by default.  If the element is parallel to Z axis, then it is classified as column by default for design.  Remain all alignments are classified as bracing for design.  In this case, since the RC girder elements are not in XY plane, these are classified as bracing by default.  Hence, we will have to inform the software that these are to be designed as beam elements.  This can be done as shown in the image below.  Once this is done, the section would be visible for design as beam.


2)  We understand that we can study the result for each construction stage and finally design for the "post CS". But is it possible to design the member at particular construction stage? Eg. design for section namely "RCgirder1pre" during "CS2" due to unable to generate/ input load combination for construction stage.
A:  Load combinations for design are considered in PostCS.  In PostCS, the construction stage loads of the final stage could only be considered.  Hence, it isn't possible to design with the loads of intermediate load case, at least for the RC design as available in midas.

3. The RC deck of the bridge is modeled as plate beam (1-D) because we didn't find any other function in Midas Civil to design for plate/ mesh member. Is it correct to use plate beam (1-D) to design as RC deck of bridge in our case?
A:  Plate 1-D beam design is supported for Eurocode in Civil 2019.  If feasible, kindly upgrade, else the design would have to be for line elements.

Kindly let us know if further assistance would be required.

Regards,
Nandeep
Technical Manager, MIDAS
Creation date: 10/17/2018 10:50 PM (dklee@midasit.com)      Updated: 10/18/2018 8:21 AM (dklee@midasit.com)
Files   
163flyRCc03.mcb
crosshead.JPG
DataImage12.png
rcgirder1.JPG