Cantilever beam with two simple supports

In this document we compare results produced by Ashes to results published in the structural analysis book by Bell (1987b).

1 Benchmark

The benchmark in Figure 6.6 from Bell (1987b) is used for this test, presented in the section below. For this benchmark, the simulation is run using the Linear and Nonlinear solvers (see Time domain simulation) and modelling the beam with Euler-Bernoulli beam theory or Timoshenko beam theory. This will produce four sets of results.

In this example, an H-beam with length and supports as shown in the figure below is analysed.

The shear area is given as 
$$A_s = 0.029\text{ m}^2$$
 and the shear correction factor is 
$$K_s = 29/149=0.195$$
. The beam considered is an HE300B model, with an Elastic modulus 
$$E=210\cdot10^9\text{ Pa}$$
and a Poisson ratio 
$$\nu = 0.3$$
Bell (1987b) provides the displacement at the point of application of the load for two cases:
  • without shear deformation (modelled with Euler-Bernoulli beams in Ashes), the displacement is
    $$\delta=4.64\cdot10^{-5}\text{ m}$$
  •  with shear deformation (modelled with Timoshenko beams) is 
    $$\delta_T = 2.14\cdot10^{-4}\text{ m}$$

Bell (1987b) also provides the moment diagram for both cases, reproduced below:

 In this figure, the values when considering shear deformation are given without brackets, and the values without shear deformation are in brackets.

2 Results

The test is considered passed when the last 20% of the Ashes time series lies within 1% of the benchmark value.

The report for this test can be found on the following link: Bell.pdf

Note: for the dynamic simulations in Ashes, the loads are ramped-up from 0 to their value in 15 seconds. It is therefore expected that the results from Ashes do not match the benchmark values for the first 15 seconds (See Loads ramp-up tab in the Analysis section.