One-way pre stressing vs two-way pre stressing, Civil Engineering

Assignment Help:

Q. One-way pre stressing vs two-way pre stressing?

At the time of pre-stressing operation at one end, frictional losses will take place and the prestressing force decreases along the length of tendon till reaching the other end. These frictional losses involve the friction induced because of a change of curvature of tendon duct and also the wobble effect because of deviation of duct alignment from the centreline. Thus the prestress force in the mid-span or at the other end would be greatly decreased in case the frictional loss is high. Thus prestressing, from both ends for a single span which implies prestressing one-half of total tendons at one end and remaining half at the other end is carried out to enable an even distribution and to provide symmetry of prestress force along the structure. 

As a matter of fact stressing at one end only has the potential advantage of lower cost when compared with stressing from both ends. For multiple spans (for example two spans) with unequal span length, jacking is generally carried out at the end of the longer span so as to provide a higher prestress force at the location of maximum positive moment. On contrary jacking from the end of shorter span will be conducted if negative moment at the intermediate support controls the prestress force. Though if the total span length is sufficiently long, jackingfrom both ends must be considered.


Related Discussions:- One-way pre stressing vs two-way pre stressing

Determine the amount of excavated material, The footprint of a proposed off...

The footprint of a proposed office building is overlaid on the existing contours topographic map of a sloping site as shown in the figure. The structural bays which are 65-ft by 65

Explain stopping sight distance on horizontal curve, Explain Stopping Sight...

Explain Stopping Sight Distance on Horizontal Curve Section Obstructions along the inside of curves can limit the available (chord) sight distance. A curve must be designed tha

Construction equipments, what is preventive maintenance and state its advan...

what is preventive maintenance and state its advantages

Explain hot weather patrolling, Q. Explain Hot weather Patrolling ? Hot...

Q. Explain Hot weather Patrolling ? Hot weather Patrolling is done for LWR and CWR tracks when the rail temperature reaches td + 20 0 C and above and td + 14 0 C for Central

Primavera, hi contactme 9902142308

hi contactme 9902142308

Verify the earth pressure at rest, A retaining wall, 6 m high, retains dry ...

A retaining wall, 6 m high, retains dry sand with an angle of friction of 30° and unit weight of 16.2 kN/m 3 . Verify the earth pressure at rest. If the water table rises to the to

Design storm water drains to match soffit, Question Why is it best to desig...

Question Why is it best to design storm water drains to match soffit? Answer Storm water drains gather storm water in their corresponding catchment areas throughout rainst

Human resource, Ask question #Minimum 100 words acceFor this discussion, lo...

Ask question #Minimum 100 words acceFor this discussion, look at a specific country of your choice. Develop two brief introductions, one for a U.S. peer, and one for a peer in anot

Permanent repairs to rail fracture, Q. Permanent Repairs to rail fracture? ...

Q. Permanent Repairs to rail fracture? (i) If the fracture is such that, wide gap A T welding ban be adopted, then the total length of fractured ends to-be cut shall be equal t

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