PORTAL FRAME

INTRODUCTION

Portal frames can be defined as two-dimensional rigid frames that have the basic characteristics of a rigid joint between column and beam. Primarily using steel or steel-reinforced precast concrete although they can also be constructed using laminated timber. Portal frame construction is therefore typically seen in warehouses, barns and other places where large, open spaces are required at low cost and a pitched roof is acceptable.

Figure 1 : Experimental Setup for Portal Frame

Figure 2 : Schematic diagram for Portal Frame

ANALYSIS

In this analysis, there is two methods are use to determine the displacement which are experimental method and  calculation via Frame 2D software.

1. Experiment Method :

In this experiment there is few assumption that need to be considered:

• Node which load applied consist of 2 roller
• Moment at node which load applied is not available
• Young modulus of material is 200000 N/mm^2

2.  Frame 2D Method:

For frame 2D method, the portal frame need to be divided into several elements. We going to make two analysis using frame 2D method:

• 3 Element Analysis
• 6 Element Analysis

3 Element Analysis :

Figure 3 : Portal Frame divided into 3 Elements

Figure 4 : Input in Frame 2D Software

Result :

Figure 5 : Results obtained from Frame 2D software for 3 elements analysis

6 Element Analysis:

Figure 6 : Portal Frame divided into 6 elements

Figure 7 : Input in Frame 2d Software for 6 elements analysis

Result:

Figure 8 : Results Obtained from Frame 2D software for 6 elements nalysis

Result from both methods ;

Table 1 : Results Obtained from Experiment and Frame 2D Software

Conclusion :

Based on the both result of analysis which are three element analysis and six element analysis, the displacement for both analysis show the not much differences. And the comparison between result of experiment and both finite element analysis show a little bit of differences. So, by doing the finite element analysis will present the actual situation.