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

Explain the geophysical methods, Why are undisturbed samples needed? Descri...

Why are undisturbed samples needed? Describe any one procedure of obtaining undisturbed samples for a multi-storeyed building project. For what purpose are geophysical methods u

Gas welding be erected in upright position, Question Explain some reaso...

Question Explain some reasons why should acetylene gas cylinders used for gas welding be erected in upright position? Answer Acetylene gas is usually used for gas wel

Nonsymmetrical loading of the snow, Nonsymmetrical loading of the snow ...

Nonsymmetrical loading of the snow A decrease in snow weight in some parts of a roof because of the wind, or melting from the heath, or the sun light would reduce internal powe

Types of pavements, Types of Pavements: On the basis of structural pe...

Types of Pavements: On the basis of structural performance of pavements, there are basically two types of pavements: (a) Flexible, and (b) Rigid. A flexible pavement

Plot vertical displacement - cantilever beam, 1. The cantilever beam-like s...

1. The cantilever beam-like structure  shown below is modeled  using  a 2 x 10 mesh of rectangular four-node plane stress elements of equal size. Do the following and compare with

Friction dampers, what is friction damper and there types?

what is friction damper and there types?

Incremental launching mode of bridge construction, In i ncremental launchin...

In i ncremental launching mode of bridge construction, what are ways adopted to increase sufficient resistance of superstructure during launching practice?

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