Prestressed Concrete Structures Online Test

1. The optimization problem involves __________

2. Which type of deflections is solved by Mohr’s theorem?

3. The bond stress is zero at the distance equal to the ____________

4. In non linear programming the boundaries of the contours of the function are _________

5. The drawback of Lee-McCall system is it cannot use ___________

6. The Composite construction was first tries for a motorway bridge?

7. Which type of analysis should be done which will lead to an optimal design of planning a structure?

8. The transmission length mainly depends up on how many factors?

9. The primary object of structural design is to obtain ____________

10. Which type of prestressing is used in prestressed concrete pavements?

11. The self compacting concrete (SCC) is generally referred as ____________

12. The rate of increase in stress in the tendons of a prestress concrete member depends upon ____________

13. If the compression zone contains part of precast element, the computation is done by considering?

14. When the links are provided, their cross sectional area should be at least?

15. Which are more expensive than continuous beams of unequal spans?

16. The cracks appear when the tensile stresses at the soffit are equal to ____________

17. In case of bridge greater than 10.7m in height and which cannot be inspected from beneath due to watery situation the instrument suited for inspection work is?

18. The complete definition of the optimum design of prestressed beams for class 1 is?

19. Which of the following basic concept is involved in the analysis of prestressed concrete members?

20. The transfer of prestress of concrete is achieved by ___________

21. Which type of reinforcement is required for the advantage of partial prestressing?

22. Vienna developed the method of wire bound reinforced concrete pipe by binding high tensile steel wires, the stresses in that were ranging in between ___________

23. Which zone attains maximum bond stress?

24. The charts proposed by Bennett are useful in dimensioning columns of ____________

25. In a concrete member, trapezoidal cable profile is adopted when the beam is subjected to __________

26. In the zone of anchorages the material preferred to minimize costs is ___________

27. Calculate moment of reinforced concrete truss such that bending moment is given as 4.3 and breadth is given as 250mm and depth is 200mm, characteristic strength of concrete is 35n/mm²?

28. The creep coefficient is high for ___________

29. The most common method of wire wrapping for circular tanks consists of __________

30. A pretensioned beam is prestressed using 5mm diameter wires, τ _bp = 7.42, ϕ = 0.00725, L_t = 485mm. Calculate the bond stress at l/4 and l/2 the transmission length from the end?

31. For heavily reinforced concrete members the nominal maximum size of aggregates shall be ____________

32. A rectangular concrete beam of cross section 100mm wide and 400mm deep is prestressed by a straight cable of span 6m, imposed load is 3.14kn/m, area is 36×10³mm²(Z=18×10⁵mm³). Calculate working moment assuming the self weight of concrete as 24kn/m³?

33. Elastomers have excellent adhesion to concrete and are not susceptible to ____________

34. One of the functions involved in construction management is?

35. A prestressed concrete beam of span 10m of rectangular section, 120mm wide & 300mm deep a curved cable having an eccentricity of 100mm at the centre of span. Find the slope of cable of support?

36. How many types of loss in prestress are observed in post tensioned members?

37. The wobble effect is the result of ____________

38. The depth variation for L shaped composite beams is ___________

39. The transmission length and bursting forces can be obtained depending on the ratio of ____________

40. The amount of steel provided in this section should not be greater than __________

41. The third major approach of structural optimization is based on the concept?

42. The fully prestressed members are prone to excessive ___________

43. Find force in cable using Freyssinet cables 12-8mm diameter and stressed to 1100n/mm² of eccentricity 50 and the prestressing force is given as 1000n/mm²?

44. The prominent prestressed sleepers which have been adopted by railways of various countries is?

45. A post tensioned cable of beam 10m long is initially tensioned to a stress of 1000n/mm² at one end, slope is 1 in 24 tendons curved at each end , area is 600mm², E_s is 210kn/mm², coefficient of friction between duct and cable is 0.55, friction coefficient for wave effect is 0.0015perm. During anchorage, if there is a slip 3mm at the jacking end, calculate final force?

46. The soffit of the beam after the transfer of prestress to concrete will be under ____________

47. Find ultimate shear strength (check it for safe against shear failure) if v_u is 27.75kn, Loss ratio is 0.8, prestressing force is 182000, area is 31400, breadth is 50 where height is 320, prestressing force is 1.7, f_cp = 4.65, f_t is 1.7?

48. The value of creep coefficient ‘f’ depends upon ___________

49. What are the advantages of reducing the w/c ratio?

50. The stress distribution at a distance far away from the loaded face is computed from ____________