FEM_Software LUSAS_Civil_Hydrology
Budget: €3 – €5 EUR
Full details in attached File, BUDGET EURO 88, bid i hourly rate to avoid Upfront fee
Use FEM Software LUSAS,
Part 1:Mesh Convergence study
Using the FEM Software LUSAS, build the following model of a concrete beam with a Global Distributed
Load. Use the FEM Software to estimate the value of the displacement at the midspan of the beam.
By confronting the FEM results with the analytical solution for the considered case, check the effect
of the number of mesh elements on the final solution.
a. Estimate the analytical solution for the considered case. (Please use the material properties
according to LUSAS Database).
b. Starting from a number of mesh elements equal to 2, build a convergence graph to show the
number of elements necessary to reach the convergence to the real solution of the problem.
(Increase the number of elements of 2 for each iteration, i.e. 2, 4 ,6 and so on).
c. Comment on the number of elements that you would consider acceptable for this model
Q2
Build the model and run the non-linear analysis and answer the following questions:
a. Report the maximum Bending Moment and the maximum horizontal displacement.
Should the maximum Horizontal Displacement be too high (i.e. >0.2m), evaluate the effect of
three possible solutions. Please evaluate the maximum bending moment and the maximum
horizontal displacement for the three following solutions:
b. Add a surcharge on the excavated soil of qexc= 10 kN/m2
(see below)
c. Consider a longer length for the wall, Ltot= 20m (with qexc= 0 kN/m2)
d. Consider the combined effect of a longer length and a surcharge load on the excavated soil
qexc= 10 kN/m2
.
Q3. Why is it important to check the validity of the adopted mesh in an engineering problem?
Q4. Why is it necessary to use non-linear joints elements to model the soil earth pressure?
Q5. What would you expect happening if linear elastic joints elements were used for the soil material
instead
Use FEM Software LUSAS,
Part 1:Mesh Convergence study
Using the FEM Software LUSAS, build the following model of a concrete beam with a Global Distributed
Load. Use the FEM Software to estimate the value of the displacement at the midspan of the beam.
By confronting the FEM results with the analytical solution for the considered case, check the effect
of the number of mesh elements on the final solution.
a. Estimate the analytical solution for the considered case. (Please use the material properties
according to LUSAS Database).
b. Starting from a number of mesh elements equal to 2, build a convergence graph to show the
number of elements necessary to reach the convergence to the real solution of the problem.
(Increase the number of elements of 2 for each iteration, i.e. 2, 4 ,6 and so on).
c. Comment on the number of elements that you would consider acceptable for this model
Q2
Build the model and run the non-linear analysis and answer the following questions:
a. Report the maximum Bending Moment and the maximum horizontal displacement.
Should the maximum Horizontal Displacement be too high (i.e. >0.2m), evaluate the effect of
three possible solutions. Please evaluate the maximum bending moment and the maximum
horizontal displacement for the three following solutions:
b. Add a surcharge on the excavated soil of qexc= 10 kN/m2
(see below)
c. Consider a longer length for the wall, Ltot= 20m (with qexc= 0 kN/m2)
d. Consider the combined effect of a longer length and a surcharge load on the excavated soil
qexc= 10 kN/m2
.
Q3. Why is it important to check the validity of the adopted mesh in an engineering problem?
Q4. Why is it necessary to use non-linear joints elements to model the soil earth pressure?
Q5. What would you expect happening if linear elastic joints elements were used for the soil material
instead