Define the shock transmission unit, Civil Engineering

Assignment Help:

Define the Shock Transmission Unit?

Ever since engineers have started designing multi span simply supported bridges, they have been dreaming of connecting all the spans together to distribute seismic loads to more than one pier during an earthquake or other sudden loadings. Thus, the peaks due to sudden force is considerably reduced. One possible solution to this requirement could be continuous construction of bridges so that a large number of piers can participate in load sharing during earthquake. But the requirement of size of expansion joint in such an arrangement would be extraordinarily large and thus not feasible. The other solution has been provided by Shock Transmission Unit (STU) or Lock Up Device (LUD).

It is a simple device which is designed to be connected between superstructure and substructure of a bridge to form a temporary rigid link. The peculiar feature of this device is that it forms a rigid link only under rapidly applied loads such as braking and seismic forces whereas under slowly applied loads such as temperature, creep, shrinkage etc, it allows the free movement. STU, thus, allows load sharing in case of suddenly applied short duration horizontal loads. The unit is connected near the bearing between the superstructure and substructure. It works on principle that rapid passage of viscous fluid through a narrow gap generates considerable resistance while slow passage through the same gap only minor resistance.

In this figure e1 and e2 are the movements accommodated in STU due to superstructure and substructure respectively.


Related Discussions:- Define the shock transmission unit

Classification of bricks based on their quality, Classification of Bricks B...

Classification of Bricks Based on their Quality The bricks used in construction are classified as following: First class bricks Second class bricks Third class bric

Higway engineering, Ask question Design the pavement by group index method ...

Ask question Design the pavement by group index method for heavy traffic using following subgrade data Soil passing 75micron sieve =65%,liquid limit =40%plastic limit =20% #Min

Explain the term - strength cement, Explain the term - strength cement ...

Explain the term - strength cement It should be appreciated that the tensioning arrangement shall have to be kept in place until tendons are cut. This shall depend on how quick

What is the liquidity index, A soil has a plastic limit of 25% and a plasti...

A soil has a plastic limit of 25% and a plasticity index of 30. If the natural water content of the soil is 34%, what is the liquidity index and what is the consistency index? H

Determine the total stopping sight distance in feet, Determine the total St...

Determine the total Stopping Sight Distance in feet A motorist is travelling down a 6% grade at 65 mph and needs to stop because of a crash scene.  Assuming a 2.0 sec PRT and 1

Roofs, Dimensions of trusses

Dimensions of trusses

Water or hydraulic horsepower (whp), Water Or Hydraulic Horsepower (whp) ...

Water Or Hydraulic Horsepower (whp) The work performed by a pump is a function of the head added by the pump (h A ), the flow rate required (Q) and the mass of the fluid (accou

Concrete structure, which section is most effective for a design of beam an...

which section is most effective for a design of beam and why

Design the drainage pipes system in reclamation areas, Q. Design the Draina...

Q. Design the Drainage pipes system in reclamation areas? In reclamation areas drainage pipes are generally laid at flatter gradients when compared with upstream stormwater pip

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