200 Questions and Answers on Practical Civil Engineering Works

200 Questions and Answers on Practical Civil Engineering Works

This book is intended primarily to arouse the interests of graduate engineers, assistant
engineers and engineers in the technical aspect of civil engineering works. The content of
the book mainly focuses on providing the reasons of adoption of the various current
practices of civil engineering. By understanding the underlying principles of engineering
practices, graduate engineers/assistant engineers/engineers may develop an interest in civil
engineering works. It is also intended that the book will serve as a useful source of
reference for practicing engineers.

During prestressing operation at one end, frictional losses will occur and the prestressing
force decreases along the length of tendon until reaching the other end. These frictional
losses include the friction induced due to a change of curvature of tendon duct and also the
wobble effect due to deviation of duct alignment from the centerline. Therefore, the
prestress force in the mid-span or at the other end will be greatly reduced in case the
frictional loss is high. Consequently, prestressing, from both ends for a single span i.e.
prestressing one-half of total tendons at one end and the remaining half at the other end is
carried out to enable a even distribution and to provide symmetry of prestress force along
the structure.


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