Explain shear stiffness in elastomeric bearing, Civil Engineering

Assignment Help:

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.


Related Discussions:- Explain shear stiffness in elastomeric bearing

Uses of cement, Uses of Cement Cement is utilized widely for the constr...

Uses of Cement Cement is utilized widely for the construction of several structures. Some of them are listed below: (i) Cement slurry is utilized for filling cracks in concr

Determine the final volume of the compacted soil, 30,000-yd 3 of banked so...

30,000-yd 3 of banked soil from a borrow pit is stockpiled before being trucked to the jobsite.  The soil has 28% swell and shrinkage of 18%.  The final volume of the compacted so

Non-distortional prestressing, Non-distortional Prestressing Concrete m...

Non-distortional Prestressing Concrete members deflect due to their own self weight. If prestressing force is applied in such a way that these deflections are eliminated due to

Determine the natural frequencies - shear building, For the shear building ...

For the shear building shown, determine the natural frequencies (RAD/SEC) and the modal matrix. Also, sketch the deflected buildings in their normal modes using the top floor as th

Show the silt curtain touching seabed, Q. Show the Silt curtain touching se...

Q. Show the Silt curtain touching seabed? Silt curtains are impermeable vertical barriers extending from seawater surface to their designed depths. Curtains are held in a verti

Determine the percentage of sand, A certain soil has 99% by weight finer th...

A certain soil has 99% by weight finer than 1 mm, 80% finer than 0.1 mm, 25% finer than 0.01 mm, 8% finer than 0.001 mm. Draw the grain-size distribution curve and determine the pe

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd