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

Railway drawings, section of railway tracks in india ,all dimensions in met...

section of railway tracks in india ,all dimensions in meters

Highway engineering., history and development of indian road and planning

history and development of indian road and planning

Define creep settlements, Creep occurs (secondary compression) after consol...

Creep occurs (secondary compression) after consolidation settlements. We defined consolidation settlement, as that compression during which excess pore pressure exists in the strat

Belt conveyors, Belt Conveyors: Belt conveyors are used for conveying ...

Belt Conveyors: Belt conveyors are used for conveying materials on a continuous basis. The materials usually handled are coal, mineral ores and stone. They are commonly instal

Support reaction, different types of support force & effect of hinge suppor...

different types of support force & effect of hinge support

Parallel pipe systems or multipath pipeline problems, Parallel Pipe Systems...

Parallel Pipe Systems or Multipath Pipeline Problems Two or more sections of piping (branches) of different diameters, lengths and/or pipe materials originating and terminating

Define the term - cracking load and proof stress, Define the term - Crackin...

Define the term - Cracking Load and Proof Stress Cracking Load The load on the structural member at the time of the initiation of first visible crack in concrete is know

#title.steel desogn, Tension memebers example for a two channel connected t...

Tension memebers example for a two channel connected to a gusset .find the tensile capacity

Explain the coefficient of permeability, A sand deposit of 12 m thick overl...

A sand deposit of 12 m thick overlies a clay layer. The water table is 3 m below the ground surface. In a field permeability pump-out test, the water is pumped out at a rate of 540

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