Two points, A and B, are established along the same direction from a theodolite station. If the subtended angle read on a subtense bar held at A and B are 0°55'20" and 0°23'44", respectively, the horizontal distance between those two points is equal to

Two points, A and B, are established along the same direction from a theodolite station. If the subtended angle read on a subtense bar held at A and B are 0°55'20" and 0°23'44", respectively, the horizontal distance between those two points is equal to

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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A stadia measurement was undertaken with a theodolite having an internal focusing telescope and a stadia interval factor of 98.8. When a backsight was taken on a turning point whose elevation is 205.62m, the rod interval observed was 1.94m; and with the horizontal hairs set at 1.50m on the rod, the vertical angle reading was -13°45'. For a foresight to a control point, the rod intercept was 1.17m; and with the horizontal hair reading of 1.60m on the rod, the vertical angle observed was +7°18'. Determine the elevation of the line of sight at the instrument point and the elevation of the point on which the foresight was taken.
A line of levels is run from BM1 to BM2 that is 8 km long. Elevation of BM1 and BM2 was found out to be 155.50, and 142.94 m, respectively. The average backsight and foresight distances were 148, and 169, respectively. Determine the corrected elevation of BM2 considering the effect of curvature and refraction. HINT: effect of curvature and refraction occurs on each rod reading. NOTE: answer in two decimal places
(Alternate Peg Method) In the two-peg test of a dumpy level, the following observations are taken: Rod reading On point A On point B Instrument set-up near M (m) Instrument set-up near P (m) 0.296 1.563 0.910 2.140 Requirements: a. Determine the true difference in elevation between A and B. b. Determine the error in the line of sight for the net distance AB c. If the line of sight is not in adjustment, determine the correct rod reading on A with the instrument still set up near B.
In tacheometry survey, an intercept of 0.755m was recorded on a staff which was believed to vertical, and the vertical angle measured on the theodolite was +15º. Actually, the staff which was 4 metres long was 0.14m out of plumb bob and leaning backwards away from the instrument position. Assuming it was an anallatic instrument with a multiplying constant of 100, what would have been the error in the computed horizontal distance?
Q#2: An open traverse survey using theodolite has been carried out and following deflection angles were observed: Stations Observed Deflection Angles α Designation of Deflection Angle A 280 25’ 00’ (L) B 680 03’ 30’’ (L) C 1200 34’ 00’’ (L) D 580 30’ 00’’ (R) E 1080 13’ 30’’ (L) F 160 50’ 00’’ (R) G 1100 00’ 30’’ (L) Compute error of closure in above deflection angles. Find out the adjusted deflection angles using computed error in part (a).
3. In the figure below, a vertical angle of -14°30' is read to a target 1.75 m above point M. The measured inclined distance (S) is 644.15 m and the elevation of point K is 320.70 m above mean sea level. If the height of instrument at K is 1.27 m, the elevation of M, considering effects of the earth's curvature and atmospheric refraction, is? HORIZONTAL LINE HI = 1.27 m S= 644.15 m M RR = 1.75 m DATUM (MEAN SEA LEVEL) Elev K = 320.70 m DE -14°30
6) The top(T) of a radio transmission tower was sighted from two small hill tops A and B which were in line with T. the angle of elevation from A to the top of tower was 38°21' and that from B to the top of tower was 21°18'. The angle of elevation from B to a target 3 m above the ground level at A was 14°56', The heights of the theodolite at A and B were 1.80 m and 1.50 m respectively. The horizontal distance between A and B was 150m and the reduced level of B was 121.50m. Calculate the RL of the top of the tower and the horizontal distance from A to the tower.
Please help with b, i & ii The slope distance between two stations A and B measured with EDM when corrected for meteorological conditions and instrument constants, is 113.893 m. The heights of the instrument and reflector are 1.739 m and 1.839 m, respectively, above the ground. To measure the vertical angle a theodolite was set up at A, 1.665 m above the ground and a target at B having height above the ground as 1.632 m. The measured angle above the horizontal was + 4°22′18″. Determine a. The horizontal length of the line AB. b. To what precision the slope angle be measured: i. if the relative precision of the reduced horizontal distance is to be 1/100000. ii. if the reduced horizontal distance is to have a standard error of ± 1.8 mm.
Three points on the ground were established such that point C is the point where the theodolite was set. A subtense bar were sighted at point A to be 00°18' and at point B is 00°19'30". If the horizontal angle was read between points A and B to be 38°45', find the distance AB. ps. please i need answer ASAP?
If a total station is set up at station K6 then station X was observed, calculate the Zenith angle and the earths curvature and atmospheric refraction. Height of instrument is 1.55m and height of prism is 1.297 m
A stadia measurement was undertaken with a theodolite having an internal focusing telescope and stadia interval factor of 98.8. When a backsight was taken on a turning point whose elevation is 205.62 m, the rod interval observed was 1.94 m; and with the horizontal hairs set at 1.50 m on the rod, the vertical angle reading was -13 degree 45’. For a foresight to a control point, the rod intercept was 1.17 m; and with the horizontal hair reading of 1.60 m on the rod, the vertical angle observed was +7 degree 18’. Determine the elevation of the line of sight at the instrument point and the elevation of the point on which the foresight was taken.