Test 23 - RCC T-Beam Slab Bridges

Question 1 ప్రశ్న 1

Which set correctly identifies the principal superstructure components of a conventional RCC T-beam slab bridge?

A Deck slab, longitudinal main girders and transverse cross girders or diaphragms B Raft slab, isolated footings and tie beams C Arch ribs, suspenders and anchor blocks D Purlins, rafters and roof trusses

Question 2 ప్రశ్న 2

Which sequence best represents the principal vertical load path in a conventional RCC T-beam slab bridge?

A Deck slab → longitudinal girders → bearings → piers or abutments → foundations B Deck slab → parapets → expansion joints → soil C Cross girders → wearing coat → deck slab → vehicle D Deck slab → foundations directly without girder action

Question 3 ప్రశ్న 3

What is an important structural function of cross girders or diaphragms in an RCC T-beam slab bridge?

A To replace all longitudinal girders B To connect the main girders transversely, increase transverse stiffness and assist distribution of concentrated live-load effects among them C To carry only the self-weight of the parapet D To eliminate bending from the deck slab

Question 4 ప్రశ్న 4

Which pairing correctly identifies the principal current Indian road-bridge code context for loads and reinforced-concrete structural design?

A IRC:6-2017 for bridge loads and load combinations; IRC:112-2020 for concrete road-bridge design B IS 875 for all bridge vehicular loads; IS 456 alone for all bridge design C IRC:58 for bridge superstructure loading; IS 800 for RCC girder design D IRC:37 for vehicular loading; IS 1343 only for all reinforced concrete bridges

Question 5 ప్రశ్న 5

A wheel load on a T-beam bridge causes local bending of the deck slab and also contributes to the global bending of the longitudinal girders. Which design principle is appropriate?

A Only the local slab effect is considered B Only the global girder effect is considered C Relevant global and local effects should be evaluated and combined as appropriate for the element being designed D The smaller of the local and global effects is always discarded

Question 6 ప్రశ్న 6

A simply supported bridge girder has a centre-to-centre distance between bearings of 18.0 m, a clear distance between supports of 17.2 m and an effective depth of 1.0 m. What effective span is used under the IRC:112 simply supported member rule?

A 17.2 m B 18.0 m C 18.2 m D 19.0 m

Question 7 ప్రశ్న 7

Why does a monolithic deck slab and longitudinal girder behave as a T-section in a positive-bending region?

A The deck slab forms part of the compression flange while the longitudinal girder forms the web B The deck slab acts only as dead load and never participates structurally C The girder web becomes the compression flange and the slab becomes a tension-only cable D T-beam action occurs only when cross girders are omitted

Question 8 ప్రశ్న 8

Which expression correctly represents the IRC:112 effective-flange-width concept for a T-beam or L-beam?

A beff = bw + Σbeff,i, where each beff,i is limited by 0.2bi + 0.1lo, 0.2lo and bi, and the total cannot exceed the available flange width B beff = bw only for every flanged beam C beff = actual deck width without any effective-width limitation D beff = lo + bw irrespective of girder spacing

Question 9 ప్రశ్న 9

For an interior T-beam, take bw = 300 mm, b1 = b2 = 2500 mm and lo = 10000 mm. Using beff,i = min[0.2bi + 0.1lo, 0.2lo, bi], what effective flange width beff is obtained?

A 2300 mm B 3000 mm C 3300 mm D 5300 mm

Question 10 ప్రశ్న 10

For a continuous longitudinal bridge girder of effective span 20 m, what value of lo may be used in the absence of a more rigorous determination of the distance between points of zero moment under the IRC:112 effective-width provision?

A 10 m B 12 m C 14 m D 20 m

Question 11 ప్రశ్న 11

A bridge deck slab is 220 mm thick and the unit weight of reinforced concrete is explicitly taken as 25 kN/m³. What is the slab self-weight per square metre?

A 4.40 kN/m² B 5.00 kN/m² C 5.50 kN/m² D 6.25 kN/m²

Question 12 ప్రశ్న 12

The slab in the previous question carries an additional permanent wearing-surface load of 1.50 kN/m². If longitudinal girders are spaced at 2.50 m centres and tributary-width distribution is used for this uniform permanent load, what line load from the slab plus wearing surface acts on an interior girder?

A 13.75 kN/m B 15.00 kN/m C 17.50 kN/m D 22.50 kN/m

Question 13 ప్రశ్న 13

The longitudinal girder in the previous question has a 300 mm wide by 900 mm deep web below the deck slab. Taking concrete unit weight as 25 kN/m³, what total permanent line load acts on the girder from the deck, wearing surface and this web self-weight?

A 17.50 kN/m B 20.25 kN/m C 24.25 kN/m D 28.75 kN/m

Question 14 ప్రశ్న 14

Treat the girder in the previous question as simply supported over a 20 m span and subjected to the uniform permanent line load of 24.25 kN/m. What is the maximum bending moment due to this load?

A 606.25 kN·m B 970.0 kN·m C 1212.5 kN·m D 2425.0 kN·m

Question 15 ప్రశ్న 15

For the same simply supported 20 m girder carrying 24.25 kN/m over the full span, what is the vertical reaction and maximum shear at either support due to this permanent load?

A 121.25 kN B 242.5 kN C 485.0 kN D 970.0 kN

Question 16 ప్రశ్న 16

Which statement is most accurate regarding transverse distribution of a concentrated vehicle load among the longitudinal girders of a T-beam bridge?

A Every longitudinal girder always receives exactly the same fraction regardless of vehicle position B The distribution depends on transverse stiffness, girder arrangement and vehicle position, so an appropriate structural distribution method is required C The nearest girder always carries 100 percent of every wheel load D Only the cross girder carries the vehicle load and longitudinal girders carry dead load alone

Question 17 ప్రశ్న 17

Which idealization is fundamental to the classical Courbon method for approximate transverse distribution of live load in a girder bridge?

A The transverse cross-girder or diaphragm system is treated as sufficiently rigid and the longitudinal girders have comparable structural properties B Every cross girder is assumed to have zero stiffness C Only one longitudinal girder is assumed to exist D The deck slab is assumed unable to transfer any transverse action

Question 18 ప్రశ్న 18

Four identical longitudinal girders have transverse coordinates x = -3 m, -1 m, +1 m and +3 m relative to the bridge centreline. A total live-load effect W = 400 kN acts at eccentricity e = +1.0 m. Using the supplied Courbon expression Ri = W/n + W e xi/Σxi², what load effect is assigned to the girder at x = +3 m?

A 40 kN B 100 kN C 120 kN D 160 kN

Question 19 ప్రశ్న 19

Using the same four-girder Courbon idealization as the previous question, what load effect would each girder receive if the total load W = 400 kN acted with zero transverse eccentricity?

A 40 kN B 80 kN C 100 kN D 160 kN

Question 20 ప్రశ్న 20

A vehicle-load effect, already including the specified dynamic allowance, is represented by a 300 kN concentrated load at midspan of a 20 m simply supported bridge. A supplied transverse distribution factor assigns 0.40 of this effect to one longitudinal girder. What live-load bending moment does that girder receive at midspan before applying any further load factor?

A 300 kN·m B 480 kN·m C 600 kN·m D 1200 kN·m

Question 21 ప్రశ్న 21

After local wheel-load dispersion has already been accounted for, a one-metre design strip of deck slab spanning transversely between longitudinal girders is idealized as simply supported over 2.4 m and subjected to an equivalent 80 kN concentrated load at midspan. What positive bending moment is obtained for this stated strip model?

A 24 kN·m B 48 kN·m C 80 kN·m D 96 kN·m

Question 22 ప్రశ్న 22

According to IRC:112, how may moments and shear forces in the top slab of a beam-and-slab bridge be determined?

A Only by one named empirical method prescribed for every bridge B By any rational and established method of analysis appropriate to the structural system C Only by treating the slab as an unsupported plate D By dividing every wheel load equally among all girders without analysis

Question 23 ప్రశ్న 23

In a continuous T-beam bridge girder, why should the positive-moment T-section idealization not automatically be used unchanged in a negative-moment region over an interior support?

A Because the top deck slab may be in tension rather than acting as the concrete compression flange B Because the girder web disappears over the support C Because negative bending produces no longitudinal stress D Because all reinforcement becomes inactive over a support

Question 24 ప్రశ్న 24

Which statement best describes the role of the web of an RCC T-beam bridge girder in a region of substantial vertical shear?

A The web is structurally irrelevant because the deck flange carries all shear B The web is a principal part of the shear-resisting mechanism and is designed together with appropriate shear reinforcement where required C The web carries only temperature reinforcement D Vertical shear is resisted only by cross girders

Question 25 ప్రశ్న 25

Why must an RCC T-beam slab bridge be checked for more than just the ultimate midspan bending strength of its longitudinal girders?

A Because bridge design also requires appropriate checks for shear, local deck effects, serviceability, crack control, fatigue where applicable, durability and other relevant limit states B Because longitudinal girders are never subjected to bending C Because only the cross girders require structural design D Because satisfying dead-load bending automatically proves adequacy for all vehicle positions

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