Match List-I (Post-tensioning system) with List-II (Arrangement of tendons in the duct ) and select the correct answer using the codes given below the lists: List- IA. FreyssientB. Gifford-UdallC. Lee-McCallD. Magnel BlatonList- II1. Single bars2. Wires evenly spaced by perforated spacers 3. Horizontal rows of four wires spaced by metal grills4. Wires spaced by helical wire core in annular spacerCodes: A B C D
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In the case of a P.S.C. beam, to satisfy the Limit State of Serviceability in cracking, match List-I with List-II and select the correct answer using the codes given below the lists:List - IA. Class 1 structureB. Class 2 structureC. Class 3 structureList- II1. No visible cracking σ1<3 N/mm22. Concrete section uncracked; crack width to be calculated to check3. No cracking under service loadsCodes:A B C
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Maximum strains in an extreme fibre in concrete and in the tension reinforcement (Fe-415 grade and Es=200 kN/mm2) in a balanced section at limit state of flexure are respectively
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The frequency distribution of the compressive strength of 20 concrete cube specimens is given in the table.f(MPa) Number of specimens with compressive strength equal to f23 428 222.5 531 529 4If μ is the mean strength of the specimens and σ is the standard deviation the number of specimens (out of 20) with compressive strength less than μ−3σ is ________.0
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A pre-tensioned (assume no losses) concrete rectangular (b×d) beam is designed on the basis of no tension. Concrete strength is σc. The maximum moment that the beam can carry is
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If fcu andfy are cube compressive strength of concrete and yield stress of steel respectively and Es is the modulus of elasticity of steel for all grades of concrete, the ultimate flexural strain in concrete can be taken as
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The probability of failure implied in limit state design is of the order of
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The singly reinforced concrete beam section shown in the figure (not drawn to the scale) is made of M25 grade concrete and Fe 500 grade reinforcing steel. The total cross- sectional area of the tension steel is 942 mm2.As per limit state design of IS 456:2000, the design moment capacity (in kN.m round off to two decimal places) of the beam section is _____________.158.27
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If the characteristic strength of concrete fck is defined as the strength below which not more than 50% of the test results are expected to fail, the expression for fck in terms of mean strength fm and standard deviation ¯¯¯σ would be
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Considering modular ratio as 13, grade of concrete as M20 and grade of steel as 415, what is the ratio of balanced depth of neutral axis as per working stress method to the balanced depth of neutral axis as per limit state method?
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A simply supported rectangular concrete beam of span 8 m has to be prestressed with a force of 1600 kN. The tendon is of parabolic profile having zero eccentricity at the supports. The beam has to carry an external uniformly distributed load of intensity 30 kN/m. Neglecting the self-weight of the beam, the maximum dip (in meters upto two decimal place) of the tendon at the mid-span to balance the external load should be ______.0.15
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For M25 concrete with creep coefficient of 1.5, the long-term static modulus of elasticity (expressed in MPa) as per the provisions of IS:456-2000 is ________.10000
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Long term elastic modulus in terms of creep coefficient (θ) and 28-days characteristic strength (fck) is given by
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As per IS 456-2000, which one of the following correctly expresses the modulus of elasticity of concrete? (read with the relevant units)
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For a pretensioned rectangular plank the uplift at centre on release of wires from anchors due to pretensioning only (force P, eccentricity e) will be
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