Technical Modelling

TOPIC 1 - CURVED 3D STRUSS

1/ Initialize the model from the grid only to draw a basic pyramid.
Assumed this pyramid represents a crystal with regular bars 2m long, the pyramidal height is 2^(1/2) ~ 1.4142m.
Create a pyramid shape by drawing the first 2 bars and then the radial rotation of these two bars.

2/ Select 2 bars. Edit -> Replicate -> Radial parameters: Rotate about line Parallel to Z: X=1, Y=1; Number =3; Angle =90

3/ Select the basic pyramid, clone the radial to create 8 more pyramids towards the left. Then the lower wing bar connects the basal pyramid to the pyramid next to it and then clones the 7 bars.

4/ Again to select the basic pyramid, clone the radial to create 8 more pyramids towards the right. Then the lower wing bar connects the basal pyramid to the pyramid next to it and then clones the 7 bars.
Replicate Linear Y to create curved 3D struss.

5/ Select all -> Edit -> Merge Joint -> OK

TOPIC 2 - SHELL MESH

Analysis of 5x5m, 10cm thickness simply supported rectangular plates.
Modulus of Elasticity E = 2.65x10^6 T/m2 and Poisson U = 0.2
Consider 2 cases:

• Distributed load q = 1 T/m2
• Concentrated load q = 5 T

Divided plates with coarse, medium and fine mode to compare their results with CSI-SAP2000/ Etabs/ others. Hence, we can view the general analysis to apply for actual design

A. Set up Units. Check file menu -> New model -> Grid only

B. Define material

C. Define -> Area Sections

D. Quick Draw Slab

E. Select all -> Ctrl R/ Edit -> Replicate to create 4 slabs.

F. Divide 5 slabs 2x2, 4x4, 6x6, 10x10, 20x20 respectively
Select area -> Edit -> Divide Areas

G. Select all nodes -> Assign -> Joint -> Restraints

Define Load Patterns & Analysis Case - needless to calculate self-weight

Assign -> Area Load -> Uniform
Assign -> Joint Load -> Force

Analyze -> Set Analysis Options -> XY Plane -> F5 to Run Analysis

Results Moment - Deformation - Distributed Case

Results Moment - Deformation - Concentrated Case