How to find back bearings?, Civil Engineering

Assignment Help:

Example:

The following fore bearings were observed respectively for lines, AB, BC, CD, DE, EF and FG. Find out their back bearings:

(i) 148°                         

(ii) 65°

(iii) 285°         

(iv) 215°

(v) N 36° W     

(vi) S 40° E

Solution: The difference between fore bearing and the back bearing of a line ought to be 180°. Noting that in WCB angle is from 0° to 360°, we find back bearing = fore bearing ± 180° + 180° is used if θ is less than 180° and - 180° is used when θ is more than 180°. So

(i)                 BB of AB = 145° + 180° = 325°

(ii)                BB of BC = 65° + 180° = 245°

(iii)              BB of CD = 285° - 180° = 105°

(iv)               BB of DE = 215° - 180° = 35°

In particular case of RB, back bearing of a line may be obtained by interchanging N and S at the identical time E and W. so

(v) BB of EF = S 36° E (vi) BB of FG = N 40° W.


Related Discussions:- How to find back bearings?

Timber design, design of timber in flexural members in terms of extreme fib...

design of timber in flexural members in terms of extreme fibre stress in bending, maximum horizontal shear stress, deflection and bearing stress perpendicular to the grain. the ful

What is the meaning of term - slip in anchorage, What is the meaning of ter...

What is the meaning of term -Slip in Anchorage In the case of post-tensioned concrete, when the tendons are anchored at the ends of concrete members, a slip of  tendons takes

Explain the influence line-moment, Influence line-moment 1.  Replace th...

Influence line-moment 1.  Replace the point of interest with an imaginary hinge. 2.  Rotate the beam one unit rotation by apply equal but opposite moments to each of the two

Define the highlights of critical path method, Define the Highlights of Cri...

Define the Highlights of Critical Path Method A network analysis technique used to predict project duration by analyzing which sequence of activities has the least amount o

Determine the magnitude of application of the active thrust, A retaining wa...

A retaining wall 9 m high retains cohesion less soil, with an angle of internal friction 33°. The surface is level with the top of the wall. The unit weight of the top 3 m of the f

Surveying, dumpy level and its procedure

dumpy level and its procedure

Construction Planning, A contractor has both a 3-cy and a 5-cy shovel in th...

A contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum size shovel that will excavate 450,000 bcy of common earth in a minimum of 120 working day

What is load carrying capacity of a pile, Q-  What are loads and forces ta...

Q-  What are loads and forces taken into account for designing a pile and what is load carrying capacity of a pile. Ans. For designing a pile the following loads and force ar

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