Explain shear stiffness in elastomeric bearing, Civil Engineering

Q. Explain Shear stiffness in elastomeric bearing?

For elastomeric bearing shear stiffness is a significant parameter for design since it influences the force transfer between bridge and its piers. Basically elastomers are flexible under shear deformation though it is relatively stiff in compression. Conversely elastomeric bearings must not be used in tension. 

Elastomeric bearing must be designed in serviceability limit state only. Cross sectional area is generally determined by the compressive stress limit under serviceability limit state. The shape factor it implies that the plan area of the laminar layer divided by area of perimeter free to bulge, affects the relation between shear stress and compressive load. Basically higher capacity of bearings can be obtained with higher shape factor. 

The long side of bearing is generally oriented parallel to the principle axis of rotation since it facilitates rotational movement. The thickness of bearings is limited and controlled by shear strain requirements. Basically the shear strain must be less than a certain limit to avoid the occurrence of rolling over at edges and delamination because of fatigue. Henceforth it follows that higher rotations and translations need thicker bearing. Instead the vertical stiffness of bearings is attained by inserting sufficient number of steelplates. Additionally checks must be made on combined compression and rotation to guard against possible occurrence of uplifting of corners of bearings under certain load combinations.

Posted Date: 8/5/2013 5:27:59 AM | Location : United States

Related Discussions:- Explain shear stiffness in elastomeric bearing, Assignment Help, Ask Question on Explain shear stiffness in elastomeric bearing, Get Answer, Expert's Help, Explain shear stiffness in elastomeric bearing Discussions

Write discussion on Explain shear stiffness in elastomeric bearing
Your posts are moderated
Related Questions

How to calculate the whole circle bearing from the included angles?

State the term - Failure Due to Strain In most of  the cases of pre-stressed concrete construction, the failure of underreinforced and lightly reinforced members shall take pla

We need eng. calcs for a deck 17''x 10 feet.attach to the guest house. calculations will be for 230 psi snow load . in the city of Mammoth lakes Ca. deck is supported for 3 girder

Cross-sectional Elements: The terms used in the cross-section of a road are : Carriageway The portion where traffic moves. Shoulder The portion outside the ca

why use wmm upon gsb can be laid dbm directly upon gsb

1. Elastomeric bearings must not be placed one behind the other along the longitudinal axis of the girder on a single line of support under any circumstances. 2. Bearings of dif

what are factors that affect bearing capacity of a shallow footing

• Gas turbines produce noise, heat radiation and exhaust gas emissions that are potentially a danger to health • Fuel is flammable and there are hot surfacesand moving parts