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

Explain precedence relationships - construction management, Explain the Pre...

Explain the Precedence Relationships a. Finish-to-Start - the most common, the predecessor activity must finish before the successor activity can start b. Finish to Finish

Conics, what is the eccentricity of ellipse

what is the eccentricity of ellipse

Explain the purpose of embedding puddle flange, Purpose of embedding puddle...

Purpose of embedding puddle flange inside the walls of closed valve chambers When valves are closed to stop water flow in a pipeline, a thrust is produced along the direction o

Rebound hammer.., rebound hammer working mechanism with detailed specificat...

rebound hammer working mechanism with detailed specifications of the images

Underwater Rebound Hammer, Would there be a difference in the result of an ...

Would there be a difference in the result of an underwater rebound hammer versus a typical rebound hammer?

Loss of prestress due to relaxation of steel, Loss of prestress due to rela...

Loss of prestress due to relaxation of steel Relaxation of steel represents the time dependent reduction of stresses in steel even when the strain remains constant. In a way i

What do you understand by pressure line, What do you understand by Pressure...

What do you understand by Pressure line If we determine the locations of resultant force at various sections of a pre-stressed beam, as in Example, we can draw a curve showing

What is the meaning of elastic shortening of concrete, What is the meaning ...

What is the meaning of Elastic Shortening of Concrete At the transfer stage, compressive prestressing force is transferred to the concrete. Due to this compressive force, concr

Non uniform flow in open channel, #ques5. A rectangular channel is 3 m in w...

#ques5. A rectangular channel is 3 m in width and draws water from a lake. The channel slope is 0.001 and the Manning’s n is 0.0013. What will be the discharge in the channel when

Constraction, sir what is means by share force

sir what is means by share force

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