Question

QN; 1

On a consturaction site, a point R is to be set out from S using 50 m steel tape.
the horizontal legth of SR is designed as 35.000 m and it lien on a constant slope of 03 27'
During the setting out the steel is laid on the ground and pulled at a tension of 70N,
the mean temperature being 12 C. the tape was standardized as 40.983 M at 50 N tension and 20 C
on a baseline of length 41.00 M. the coefficient of thermal expansion of the tape materail is 0.000 011
2 per C. Young's modulus is 200 kN MM-2 and the cross-sectional area of the tape is 2.4 mm2.


Calculate the legngth that should be set out on the tape along the direction SR to establish the exact position of point R


QN 2

A steel tape of nominal length 30 m was used to transfer à level from a reference line near
the base of a vertical concrete column to a reference line near its top. A 100 N weight was attached
to its free end and the tape was hung freely down the side of the column such that its 100 mm
mark was against the bottom reference line. A reading of 14.762 m was obtained at the top reference line.
The tape used was standardized on the flat as 30.007 m at a tension of 50 N and a temperature of 20°C.
It had a cross-sectional area of 1.9 mm, the coefficient of thermal expansion of the tape material
was 0.000 011 2 per °C and Young's modulus was 210 kN mm-. During the measurement the mean
temperature of the tape was 3°C. Calculate the vertical distance between the Two reference lines.

Answer 1

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