Prestressed Concrete Structures Mock Test 6

1. The formula recommended by the British code BS: 8110 – 1985 for the estimation of surface crack width W_cr is?

2. The various codes recommend empirical relations to estimate ____________

3. The effective punching area A_pun is generally the contact area of ____________

4. Find prestressing force if area is 36.75mm² of eccentricity 580 given f_inf is 26.5kn/m and z_b is 99x10⁶?

5. Find the deflection due to self weight given that ϕ = 1.6, E_e = 2.6E_ce, elastic modulus of concrete is 34x10³, gravity is given as 6, self weight is 0.76, Length of the cable is 1000, elastic modulus of concrete is 34x10³ , Moment of inertia is 3200x10⁵?

6. Find the Permissible stresses and range of stresses for class 1 structure f_cu = 50n/mm², f_ck = 35n/mm² according to BS: 8110 recommendations for f_cu = 50n/mm² and f_ci = 35n/mm²,f_ct = 0.5f_ci = 17.5n/mm²?

7. Check for ultimate flexural strength if given A_ps is 154mm², f_pu is 1600n/mm², b is 160mm, f_cu is 50n/mm²and diameter is 265mm?

8. The reason for smaller crack widths in slabs under service loads is?

9. The end block of a beam has a rectangular section 100mm wide by 200mm deep, the force of cable is 200kn. Find the actual bearing pressure?

10. The pitch of spirals is limited to a range of ____________