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how to calculate the total loss of prestressas a general guide it may be taken that total loss of prestress may be in the range of 20 to 25 percent
categories of losses of prestresswe may put various losses in either of two categories losses which take place during transfer of prestress and
total loss of prestress the total amount of losses of prestresses may be accounted for in a prestressed concrete member by adding different losses
a cylindrical concrete tank 30 m external diameter is to be prestressed circumferentially by means of high-strength steel wire e 2 x 105
state about the pre-tensioned concrete beama pre-tensioned concrete beam 200 mm wide and 300 mm deep is prestressed by straight wires carrying an
relaxation losses in prestressing steelsthe relaxation losses in prestressing steels vary with type of steel initial prestress age and temperature
loss of prestress due to relaxation of steel relaxation of steel represents the time dependent reduction of stresses in steel even when the strain
state the term - calculation of deformation of concretefor the calculation of deformation of concrete at some stage before the maximum shrinkage is
explain the shrinkage strain of concreteshrinkage of concrete depends only on the interval of time and the moisture conditions but is independent of
shrinkage of concrete in prestressed members the shrinkage of concrete in prestressed members results in a shortening of ensioned wires and hence
loss of prestress due to shrinkage of concrete we know that concrete shrinks in volume when it dries up this volume reduction takes place in the form
calculation of deformationfor calculation of deformation at some stage before the total creep is reached it may be assumed that about half the
define the term- erection stresses the creep loss due to live load stress erection stresses and other stresses of short duration may be ignored the
determine the term - lowering of stressesdue to creep of concrete these compressive strains keep on increasing with time it means that the length
method to calculate the loss of prestress when the consider creep in regard to loss of prestress we have to see that the prestressed member is under
loss of prestress due to creep of concretecreep of concrete means time dependent deformation of concrete its effect depends upon the interval of
discuss about the post-tensioning systemsin most of post-tensioning systems when the cable is tensioned and the jack is released to transfer
how can we reduced frictional lossesfrictional losses can be reduced by several methods such as a over-tensioning the tendons by an amount equal to
state the effect of friction for a straight tendonthe length effect represents the effect of friction for a straight tendon due to slight
state the term- friction in tendonconsiderable frictional loss takes place due to friction between the tendon and the material surrounding it namely
determine the loss in post-tensioned membersthis loss occurs only in post-tensioned members there always exists a certain amount of friction in the
state the loss of prestressloss of prestress due to elastic shortening definitely occurs in pre-tensioned concrete members but in post-tensioned
loss of prestress due to elastic shortening at the transfer of prestress tensile stresses of tendons are transferred to concretc in the form of
determine about the prestressed concretein prestressed concrete the most important parameter is the prestressing force ifthe prestressing force
use of admixtures in concretethe use of chemical admixtures may be made in prestressed concrete construction but the admixture should not contain