Test 28 - Simple Steel Beams

Question 1 ప్రశ్న 1

Which statement correctly describes the current IS 800:2007 design approach for a simple rolled steel beam?

A Only elastic permissible-stress bending may be used B Strength and serviceability limit states are checked using the Limit State framework, with member stability also considered where relevant C Only deflection is checked because rolled sections are factory-made D A beam is adequate whenever its gross area is sufficient

Question 2 ప్రశ్న 2

Which Indian Standard is primarily used to obtain standard dimensions and sectional properties of hot-rolled steel beam, column, channel and angle sections?

A IS 808:2021 B IS 456:2000 C IS 3370 (Part 2):2021 D IS 875 (Part 3):2015

Question 3 ప్రశ్న 3

A conventional rolled I-beam is placed with its web vertical and carries downward gravity loads. About which axis does it normally resist its principal bending?

A About its longitudinal axis B About its minor centroidal axis C About its major centroidal axis D About an axis passing through only the compression flange

Question 4 ప్రశ్న 4

Which expression defines the elastic section modulus Ze of a beam cross-section about a specified bending axis?

A Ze = Aymax B Ze = I/ymax C Ze = I/A D Ze = sqrt(I/A)

Question 5 ప్రశ్న 5

A rolled beam has second moment of area I = 120 × 10^6 mm^4 about its major axis. Its extreme fibre is 200 mm from the neutral axis. What is its elastic section modulus about that axis?

A 300 × 10^3 mm^3 B 400 × 10^3 mm^3 C 500 × 10^3 mm^3 D 600 × 10^3 mm^3

Question 6 ప్రశ్న 6

How does IS 800 section classification affect the bending resistance expression of a laterally supported rolled beam under low shear?

A All section classes must use the gross area instead of a section modulus B Only slender sections may develop the full plastic moment C Plastic and compact sections may use the plastic section modulus subject to code limits, while semi-compact sections are limited essentially by the elastic section modulus D Section classification affects only shear and never bending

Question 7 ప్రశ్న 7

A laterally supported compact simply supported rolled beam has Zp = 850 × 10^3 mm^3, Ze = 760 × 10^3 mm^3, fy = 250 MPa and gamma_m0 = 1.10. The design shear is below 0.6Vd. Using Md = Zp fy/gamma_m0 subject to the simply supported beam limit Md not exceeding 1.2Ze fy/gamma_m0, what design bending strength governs?

A 193.2 kN·m B 207.3 kN·m C 170.0 kN·m D 231.8 kN·m

Question 8 ప్రశ్న 8

A laterally supported semi-compact beam has Zp = 900 × 10^3 mm^3, Ze = 800 × 10^3 mm^3, fy = 250 MPa and gamma_m0 = 1.10. Neglect high-shear effects. What design bending strength follows from beta_b = Ze/Zp?

A 163.6 kN·m B 181.8 kN·m C 204.5 kN·m D 225.0 kN·m

Question 9 ప్రశ్న 9

A rolled beam has an effective shear area Av = 3000 mm^2, web yield stress fyw = 250 MPa and gamma_m0 = 1.10. Assuming shear yielding governs and shear buckling does not, what is Vd = Av fyw/(sqrt(3) gamma_m0)?

A 227.3 kN B 340.9 kN C 393.6 kN D 681.8 kN

Question 10 ప్రశ్న 10

For the beam in the previous question with Vd = 393.6 kN, above what factored shear force does the IS 800 high-shear interaction provision begin to affect the ordinary bending-strength calculation?

A 157.4 kN B 196.8 kN C 393.6 kN D Approximately 236.2 kN

Question 11 ప్రశ్న 11

What is the principal consequence when the factored shear in a steel beam exceeds 0.6Vd?

A The bending strength may have to be reduced to account for interaction between high shear and bending B The beam automatically fails regardless of its remaining capacity C The bending strength always increases because the web is highly stressed D Only deflection needs to be checked

Question 12 ప్రశ్న 12

A simply supported steel beam of span 6 m carries a factored uniformly distributed load of 30 kN/m over its entire span. What are the maximum factored bending moment and support shear respectively?

A 90 kN·m and 135 kN B 180 kN·m and 90 kN C 135 kN·m and 90 kN D 135 kN·m and 180 kN

Question 13 ప్రశ్న 13

A laterally supported compact beam must resist a factored bending moment of 180 kN·m. Take fy = 250 MPa and gamma_m0 = 1.10, and assume the applicable section-modulus upper limit does not govern. What minimum plastic section modulus Zp is required from Md = Zp fy/gamma_m0?

A 650 × 10^3 mm^3 B 792 × 10^3 mm^3 C 900 × 10^3 mm^3 D 990 × 10^3 mm^3

Question 14 ప్రశ్న 14

A simply supported steel beam of span 8 m carries a factored concentrated load of 120 kN at midspan. What are the maximum bending moment and maximum support shear?

A 120 kN·m and 120 kN B 180 kN·m and 60 kN C 240 kN·m and 120 kN D 240 kN·m and 60 kN

Question 15 ప్రశ్న 15

A simply supported steel beam has span 6 m, service UDL 12 kN/m, E = 2.0 × 10^5 N/mm^2 and I = 180 × 10^6 mm^4. Using delta_max = 5wL^4/(384EI), what is the maximum elastic deflection?

A 5.63 mm B 11.25 mm C 16.88 mm D 22.50 mm

Question 16 ప్రశ్న 16

Which statement correctly reflects the amended IS 800:2007 serviceability procedure for beam deflection?

A Deflection is calculated only under ultimate factored loads B Deflection may be ignored whenever bending strength is adequate C Deflection is checked by elastic analysis for the most adverse but realistic service-load combinations, using the applicable serviceability load factors given in Table 4 D Every serviceability load component must always be multiplied by exactly 1.50

Question 17 ప్రశ్న 17

What is lateral-torsional buckling of a steel beam?

A Pure web crushing with no lateral movement B An instability in which the compression region moves laterally and the beam twists as bending resistance is lost C Yielding of the entire tension flange without any displacement D Local bearing failure beneath a support

Question 18 ప్రశ్న 18

A simply supported laterally unsupported compact rolled beam has Zp = 900 × 10^3 mm^3, Ze = 800 × 10^3 mm^3, fy = 250 MPa and gamma_m0 = 1.10. If its lateral-torsional buckling reduction factor is chi_LT = 0.75, use fbd = chi_LT fy/gamma_m0 and Md = Zp fbd. What design bending strength is obtained?

A 102.3 kN·m B 136.4 kN·m C 204.5 kN·m D 153.4 kN·m

Question 19 ప్రశ్న 19

Which condition most directly improves the lateral-torsional buckling resistance of a rolled steel beam?

A Providing effective lateral restraint to the compression flange and reducing its unrestrained length B Removing all transverse connections to the compression flange C Reducing the minor-axis stiffness of the section D Increasing the unrestrained length while keeping the section unchanged

Question 20 ప్రశ్న 20

An unstiffened beam web has clear depth d = 600 mm, thickness tw = 8 mm and web yield stress fyw = 250 MPa. Taking epsilon_w = sqrt(250/fyw) = 1.0, what does the IS 800 criterion d/tw > 67epsilon_w indicate?

A d/tw = 50, so shear buckling need not be considered B d/tw = 60, so only bending must be checked C d/tw = 75, which exceeds 67, so shear-buckling resistance of the web requires verification D d/tw = 80, so the beam automatically fails

Question 21 ప్రశ్న 21

What is the purpose of the shear area Av used in the IS 800 shear-strength calculation of an I-beam?

A It represents only the area of the tension flange B It represents the effective portion of the cross-section principally participating in resistance to vertical shear C It is always identical to the gross cross-sectional area D It is the area used exclusively for lateral-torsional buckling

Question 22 ప్రశ్న 22

A large concentrated reaction acts on a rolled steel beam near a support. Which additional web behaviour may require checking apart from the overall beam shear capacity?

A Only flange yielding at midspan B Only lateral-torsional buckling at the point of zero moment C Only elastic deflection of the tension flange D Local web bearing, yielding or buckling/crippling beneath the concentrated force

Question 23 ప్రశ్న 23

Which sequence represents a sound preliminary procedure for selecting a simple rolled steel beam?

A Determine design actions, choose a trial rolled section, classify it, check bending and shear including stability, then verify serviceability and detailing B Choose the lightest available section first and omit all stability checks C Check deflection only and accept the section if it is below the limit D Select a section entirely from gross area without calculating bending moment

Question 24 ప్రశ్న 24

A laterally supported compact simply supported beam has Md = 193.2 kN·m and Vd = 393.6 kN. It is subjected to factored moment M = 175 kN·m and factored shear V = 180 kN. Its service deflection is 18 mm against a specified limit of 20 mm. Which conclusion is correct, assuming no other limit state governs?

A It fails because V is greater than 0.6Vd B It fails only in deflection C It satisfies the stated bending, shear and deflection checks, and the shear is below the high-shear threshold D It fails because every beam must have zero service deflection

Question 25 ప్రశ్న 25

Under the IS 800 lateral-restraint guidance for a gravity-loaded beam, when may a floor connection to the compression flange be considered capable of providing full lateral restraint, subject to the stated code conditions?

A When it can resist a lateral force of only 0.5 percent of the compression-flange force B When positive restraint can resist a lateral force of at least 2.5 percent of the maximum compression-flange force, with the floor system capable of carrying that restraint force C Whenever the floor merely touches the beam without a positive connection D Only when the beam web is thicker than the compression flange

Answer Key || సమాధానాల పట్టిక

Related Quizzes || సంబంధిత క్విజ్‌లు

Civil HMWSSB, Unit 3 - Cement Concrete and Steel Structures Quiz

TGPSC HMWSSB Quiz

Answer Key సమాధానాల పట్టిక

Related Quizzes సంబంధిత క్విజ్‌లు