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

Trusses design, does the truss pitch relate to the building''s height?

does the truss pitch relate to the building''s height?

Staircase, The Figure 1 below shows a section through a stairway for a gara...

The Figure 1 below shows a section through a stairway for a garage in a new proposed dwelling. The stairway is 3 meters wide with 300 mm wide treads(7 treads) and 170 mm high riser

Conducting triaxial test, Question In conducting triaxial test to deter...

Question In conducting triaxial test to determine shear strengths for soil samples, what consolidation pressures should be specified? Answer It appears that the sele

Time to remove formwork to cater for early thermal movement, Q. Time to rem...

Q. Time to remove formwork to cater for early thermal movement? Let's take a circular column as an illustration to explain effect of internal restraint to thick sections.  W

Explain types of tiles, Q. Explain Types Of Tiles? Different types of t...

Q. Explain Types Of Tiles? Different types of tiles available in the market for floor and walls & dado are as under - 1. Glazed tiles , 2. Ceramic tiles , 3. Granit

Internal force of preloaded fasteners, Q. Internal force of preloaded faste...

Q. Internal force of preloaded fasteners? Force in a bolt in a bolted joint relies on the preloading force applied to it at the time of the tightening operation. For example, w

Self compacting concrete, what will be the w/c ration and cement/fly ash ra...

what will be the w/c ration and cement/fly ash ration for the particular mix design

Premix carpet open graded, what is premix carpet open graded and where is i...

what is premix carpet open graded and where is it used and what are its limitations ?

Classification of timber based on durability, Classification Based on Durab...

Classification Based on Durability: Durability tests are conducted by the forest research establishment. They cover test specimen of size 600 × 50 × 50 mm in the ground to hal

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