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

Concrete, describe in detail the uses of concrete

describe in detail the uses of concrete

Minor losses using th method of loss coefficients, Minor Losses Using Th Me...

Minor Losses Using Th Method of Loss Coefficients One method of calculating the energy loss as a result of fluid flowing through a device or fitting, each device or fitting has

Explain the methods of underwater inspection, Explain the Methods of Underw...

Explain the Methods of Underwater Inspection? There are three common methods of carrying out underwater inspection of bridge elements. a)  Wading inspection b)  Scuba div

State the problem and phases of site investigation, State the Problem and p...

State the Problem and phases of site investigation The site investigation is to be performed to obtain the solution for the following problems: i)  Foundation problems ii

Theory on the horizontal reactions of portal frames, Determine the horizont...

Determine the horizontal abutment reaction of a rectangular portal frame under increasing central concentrated load

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

Shape factor, For a solid circular shaft transmitting torque, the shape fac...

For a solid circular shaft transmitting torque, the shape factor is

Stress, Determine elongation because of self weight of bar:

Determine elongation because of self weight of bar:

Cement, Ask What is the density of cement?

Ask What is the density of cement?

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