RUBBER DAMPER

INTRODUCTION

Rubber damper have been use widely in building’s construction in japan. Natural disaster that happen often in japan that cannot be avoided such as earthquake cause the expansion use of rubber damper in their building’s construction even in the escalator! In Malaysia, rubber damper also being use in the MRT rail construction. In this analysis we will determine the deformation of rectangular block of a rubber damper as shown in pic below:

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Rectangular Rubber Damper With Dimension

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Exampel of deformed rubber damper after being loaded

ANALYSIS

The rubber damper is then divided into eight elements that connected together as Picture below:

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8 Elements Constructed

CALCULATION

A few assumptions need to be considered before starting the calculation:

  • This is Plain Stress Analysis
  • The Young Modulus Of Rubber is 10000 N/mm^2
  • The Poisson Ratio Of Rubber is 0.4

The data inserted  into CST(Constant Strain Triangle) Software in order to calculate the deformation of the rubber damper.

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All data being put into the software via Microsoft Excel

RESULTS

The results obtained is calculated by using CST software and the results obtained is as shown in the picture below:

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Final Deformation Results

Based on the results obtained above, we can construct the deformation of the rubber damper manually.

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The blue dots represent the deformation shape after the rubber damper is loaded with the forces.

CONCLUSION

From the analysis we can conclude that the deformation mostly happen at the top of the rubber damper due to force acting on the top of the damper. The load distributed on the top of the rubber damper is equal at all points cause the deformation of the rubber damper equal on both sides.