MCQOPTIONS
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MCQOPTIONS
This section includes 3 Mcqs, each offering curated multiple-choice questions to sharpen your Prestressed Concrete Structures Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
A prestressed concrete beam, 200mm wide and 300mm deep is prestressed with wires (area is 320mm2) located at a constant eccentricity of 50mm, initial stress of 1000n/mm2, span is 10m. Calculate loss of stress due to friction and slip anchorage of post tensioned beam?(Es = 210kn/mm2, Ec = 35kn/mm2). |
| A. | 21 and 15 |
| B. | 35 and 25 |
| C. | 15 and 20 |
| D. | 5 and 10 |
| Answer» B. 35 and 25 | |
| 2. |
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, Es 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? |
| A. | 39.8kn |
| B. | 40.2kn |
| C. | 37.8kn |
| D. | 48.8kn |
| Answer» D. 48.8kn | |
| 3. |
A concrete beam is post tensioned by a cable carrying an initial stress of 1000n/mm2, the slip at the jacking end was end was observed to be 5mm; modulus of elasticity of steel is 210kn/mm2. Estimate the percentage loss of stress due to anchorage if length of beam is 30m? |
| A. | 3.5% |
| B. | 4.5% |
| C. | 5.5% |
| D. | 8.7% |
| Answer» B. 4.5% | |