This document discusses two new elements added to OpenSees for structural analysis. The first is an ElasticBeam3dCype element that uses Timoshenko beam theory and can apply various load types and account for eccentricities. The second is a ShellCype element that is a 6-node triangular shell element capable of membrane, bending, and shear behavior under different load cases. The additions also include a new constraint handler and implementation of sequential MUMPS to allow OpenSees integration into BIM workflows and perform dynamic nonlinear analysis in the future.

1. Two new elements to
opensees
Javier Pereiro Barceló
Manuel Fernández Baños

2. Introduction
• StruBIM Analysis, StruBIM Design and
StruBIM Foundations are three
structural engineering programs to
calculate and/or design buildings. Every
program is integrated in the workflow
• This workflow is a global proposal to
achieve user collaboration in the
design, execution and maintenance of
buildings, based on an exchange of
information using standard formats
(IFC)
Physical 3D Model
Specialized Applications
Technical Documents
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

3. StruBIM
• StruBIM Analysis
Software package for static linear structural analysis.
• StruBIM Design
Software package for designing and checking of columns,
beams, slabs (w/o PT) and walls according to ACI 318-08, ACI
318-11, ACI 318-14. StruBIM design also performs local
analysis.
• StruBIM Foundations
Software package for design and checking of foundations
(pile caps, beams, mat foundations (w/o PT) according to ACI
318-08, ACI 318-11, ACI 318-14. StruBIM foundations also
performs local analysis.
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

4. Objective
Cype wants to have well-known, fast and reliable analysis engines in every building discipline.
Nowadays we use the following engines:
 Acoubat – Centre Scientifique et Technique du Bâtiment for acoustics
 Randiance - Lawrence Berkeley National Laboratory for illumination
 EnergyPlus - U.S. Department of Energy Building Technologies Office for energetic analysis
 Ashrae - American Society of Heating, Refrigerating and Air-Conditioning Engineers for
thermal comfort
 Epanet - U.S. Environmental Protection Agency for water supply
 For structural analysis  OpenSees
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

5. Objective
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

6. Needs
1. Use one-dimensional elastic element and 6 node triangular shell
element (due to mesher)
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

7. Needs
2. Create complex relations between nodes:
3. Calculate efficiently several load cases
d and e  same rotation
b and c  rotations related to a
rotational spring
f  connects to the node through
rotational spring
all  belong to a rigid diaphragma
b
c
e
f
dnode
frames
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

8. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ElasticBeam3dCype
•Timoshenko theory
•Point, uniform, trapezoidal (even in a portion
of the length) and temperature (uniform or
gradient) loads
•Local eccentricities
•As input parameters it has stiffness modifier
factors
•Stresses and calculated by integration of
equilibrium equations without needing new
nodes
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

9. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ElasticBeam3dCype
•Timoshenko theory
•Point, uniform, trapezoidal (even in a portion
of the length) and temperature (uniform or
gradient) loads
•Local eccentricities
•As input parameters it has stiffness modifier
factors
•Stresses and calculated by integration of
equilibrium equations without needing new
nodes
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

10. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ElasticBeam3dCype
•Timoshenko theory
•Point, uniform, trapezoidal (even in a portion
of the length) and temperature (uniform or
gradient) loads
•Local eccentricities
•As input parameters it has stiffness modifier
factors
•Stresses and deflections are calculated by
integration of equilibrium equations without
needing new nodes
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

11. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ElasticBeam3dCype
•Timoshenko theory
•Point, uniform, trapezoidal (even in a portion
of the length) and temperature (uniform or
gradient) loads
•Local eccentricities
•As input parameters it has stiffness modifier
factors
•Stresses and deflections are calculated by
integration of equilibrium equations without
needing new nodes
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

12. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ShellCype
•6 node triangular shell element. Plane stress,
thin and thick behavior. Membrane, bending
and shear behavior.
•Uniform, trapezoidal and temperature loads
•Coplanarity
•Local eccentricities
•It is optimized for linear problems and admit
non-linear ones
•New material:
ElasticMembranePlateSectionCype
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

13. Problems - Solutions
• Need: Use one-dimensional elastic element and 6 node triangular shell element
ShellCype
•6 node triangular shell element. Plane stress,
thin and thick behavior. Membrane, bending
and shear behavior
•Uniform, trapezoidal and temperature loads
•Coplanarity
•Local eccentricities
•It is optimized for linear problems and admit
non-linear ones
•New material:
ElasticMembranePlateSectionCype
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

14. More changes
o We have created a new way to manage constraints:
dofRelation, CYPEConstraintsHandler , Transformation_DOFGroupCYPE
o We have added sequential Mumps:
CYPEMumpsSolver, CYPEMumpsSOE
o We execute several OpenSees at the same time to each load case
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

15. Soon
• Spectral modal analysis
• Non-linear analysis
• Seismic analysis with accelerograms
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

16. Conclusions
• Cype has developed two new elements, a constraint handler and has
implemented sequential MUMPS to OpenSees. They will be available soon
in the OpenSees repository
• Previous additions allows to integrate OpenSees in a BIM workflow
• In the near future, Cype will perform dynamic non-linear analysis with
OpenSees
THANK YOU
Introduction StruBIM Objective Needs Problems - Solutions More changes Soon Conclusions

17. Two new elements to
opensees
Javier Pereiro Barceló
Manuel Fernández Baños