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

Enumerate the limit state of serviceability, Limit State of Serviceability ...

Limit State of Serviceability Deflection In the consideration of this limit state, the deflection of a structural member is considered. The code recommends that the deflection

Calculate roller production, Calculate Roller Production An excavating ...

Calculate Roller Production An excavating contractor determined through a test strip, that a smooth steel-wheel vibrating roller compactor operating at 3-mph can compact a 6-in

Avoidance of designing acute angle of concrete pavement, Q. Avoidance of de...

Q. Avoidance of designing acute angle of concrete pavement The stress persuaded in acute angle corners of concrete pavement is far much higher than right-angle corners of the

Effects of sewer sediment on hydraulic performance, Q. Effects of sewer sed...

Q. Effects of sewer sediment on hydraulic performance? The presence of sediment in sewers has contrary effects on the hydraulic performance of sewers. In case of sewage flow ca

Estimate the probable final settlement, A bed of sand 12 m thick is underla...

A bed of sand 12 m thick is underlain by a compressible stratum of normally loaded clay, 6 m thick. The water table is at a depth of 5 m below the ground level. The bulk densities

Explain the equalization basins - hydraulic system, Equalization Basins - H...

Equalization Basins - Hydraulic System For influent flow to publicly owned treatment works (POTWs), flow rates may be excessive for short or long durations, especially in combi

Write short notes on bricks, Q. Write short notes on Bricks? Bricks are...

Q. Write short notes on Bricks? Bricks are an important construction material required in bulk Quantities for construction of walls both sub structure & super structure. For th

MatLab, can you help me with an assignment

can you help me with an assignment

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