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How to Perform Analysis and Design in Midas Gen 2015

Midas Gen 2015 is a software program that allows engineers to perform structural analysis and design of various types of buildings and structures. It supports various international codes and standards, such as NSCP 2015 for the Philippines. In this article, we will show you how to use Midas Gen 2015 to perform analysis and design of a simple steel truss shed.

Step 1: Modeling

The first step is to create a model of the structure in Midas Gen 2015. You can use the graphical user interface or the input file editor to define the geometry, materials, sections, supports, and loads of the structure. You can also import models from other software programs, such as AutoCAD or Revit. For this example, we will use the input file editor to create a model of a steel truss shed with a span of 20 m, a height of 6 m, and a roof slope of 15 degrees. The truss members are made of steel with a yield strength of 250 MPa and a section area of 0.01 m. The roof is made of corrugated metal sheets with a weight of 0.1 kN/m. The wind load is assumed to be 0.5 kN/m acting horizontally on the roof.

The input file for the model is shown below:

*UNIT

KN,M

*NODE

; Node# X Y Z

1 0 0 0

2 10 0 0

3 20 0 0

4 0 6 3

5 10 6 6

6 20 6 3

*ELEMENT

; Elem# NodeI NodeJ Mat# Sec#

1 1 4 STEEL TRUSS

2 4 5 STEEL TRUSS

3 5 6 STEEL TRUSS

4 6 3 STEEL TRUSS

5 2 5 STEEL TRUSS

6 4 2 STEEL TRUSS

7 -1 -1 -1 -1 ; End of truss elements

8 -2 -2 -2 -2 ; Start of beam elements

9 1 2 STEEL BEAM

10 2 3 STEEL BEAM

11 -1 -1 -1 -1 ; End of beam elements

*MATERIAL

; Mat# E(GPa) U Poisson G(GPa) Density(kN/m3) Alpha(1/C)

STEEL 200 .3 .769 .078 .000012 ; Steel material

*SECTION

; Sec# Area(m2) Ixx(m4) Iyy(m4) J(m4)

TRUSS .01 .000001 .000001 .000002 ; Truss section

BEAM .02 .000004 .000004 .000008 ; Beam section

*SUPPORT

; Node# FX FY FZ MX MY MZ ; Fixed support at nodes 1 and 3

1 FIXED FIXED FIXED FREE FREE FREE

3 FIXED FIXED FIXED FREE FREE FREE

*LOADCASE ; Define load cases: DL for dead load, WL for wind load

DL DEAD LOAD ; Dead load case name and type

WL WIND LOAD ; Wind load case name and type

*LOAD ; Define loads for each load case: N for node load, E for element load

DL N ; Dead load node load

; Node# FX FY FZ MX MY MZ

4 .0 -.18 -.18 .0 .0 .0 ; Roof weight at node 4

5 .0 -.36 -.36 .0 .0 .0 ; Roof weight at node 5

6 .0 -.18 -.18 .0 .0 .0 ; Roof weight at node 6

WL E ; Wind load element load

; Elem# FX FY FZ MX MY MZ

2 .0 -.25 -.25 .0 .0 .0 ; Wind load on element 2

3 .0 -.25 -.25 .0 .0 .0 ; Wind load on element

Step 2: Analysis 061ffe29dd