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Exam
Question 1. Which historical bridge type primarily carries loads through arch action and was widely used by the Romans? A) Beam bridge B) Truss bridge C) Arch bridge D) Suspension bridge Answer: C Explanation: Roman bridges relied on the arch shape to transfer loads primarily as compression through the curve. Question 2. In site selection, which geological condition most adversely affects the bearing capacity of shallow foundations? A) Sandy soil with low water table B) Dense clay with high plasticity C) Weathered granite outcrop D) Thick alluvial deposits Answer: B Explanation: Highly plastic clays can lose strength when saturated, reducing bearing capacity. Question 3. Which aesthetic principle emphasizes minimizing visual impact by using materials that blend with the surrounding landscape? A) Monumentality B) Transparency C) Contextualism D) Futurism Answer: C
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Explanation: Contextualism seeks harmony between the bridge and its environment. Question 4. Life-cycle cost analysis (LCCA) most directly compares which two cost categories? A) Initial construction cost vs. demolition cost B) Material cost vs. labor cost C) Construction cost vs. maintenance and operation cost over the design life D) Design fee vs. contractor profit Answer: C Explanation: LCCA evaluates total cost, including long-term maintenance, against the upfront construction expense. Question 5. The minimum vertical clearance for a navigable river bridge in the United States is typically dictated by: A) State highway code B) Federal Aviation Administration C) U.S. Coast Guard regulations D) Local zoning ordinances Answer: C Explanation: The Coast Guard sets clearance requirements for navigable waterways. Question 6. Dead load on a bridge includes which of the following? A) Vehicle live load B) Self-weight of the structure and superimposed dead loads such as pavement C) Wind pressure on the deck D) Seismic inertia forces
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Answer: C Explanation: Aerodynamic effects such as vortex shedding dominate wind loading on long spans. Question 10. Snow load on a bridge deck is primarily a function of: A) Snow density, roof slope, and exposure factor B) Traffic speed and vehicle weight C) River flow velocity D) Seismic zone Answer: A Explanation: Snow load depends on snow density, slope of the deck, and exposure to wind. Question 11. In seismic design, the primary purpose of providing ductility in bridge members is to: A) Increase stiffness B) Reduce weight C) Allow energy dissipation through inelastic deformation D) Prevent corrosion Answer: C Explanation: Ductile behavior enables bridges to absorb seismic energy without brittle failure. Question 12. The most critical load combination for fatigue design of a steel bridge according to AASHTO is: A) 1.25 Dead + 1.5 Live B) 1.0 Dead + 1.0 Live + 0.5 Impact
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C) 1.0 Dead + 0.9 Live + 0.5 Seismic D) 1.0 Dead + 1.0 Live + 0.5 Wind Answer: B Explanation: Fatigue checks often use the service load combination with impact factor to capture repeated traffic loading. Question 13. In a reinforced-concrete T-beam, the flange primarily serves to: A) Resist shear forces B) Increase torsional stiffness C) Carry compressive stresses from the slab D) Provide anchorage for reinforcement Answer: C Explanation: The flange (deck slab) acts as a compression zone for the T-beam. Question 14. Pre-tensioned concrete members differ from post-tensioned members in that: A) Tendons are stressed after concrete has hardened B) Tendons are stressed before concrete is placed and remain bonded throughout C) They use external cable systems only D) They cannot be used for segmental construction Answer: B Explanation: Pre-tensioning applies stress to tendons before concrete casting, and the tendons bond as the concrete cures. Question 15. Which construction method is most suitable for building a long-span segmental box girder bridge over a deep valley? A) Cast-in-place slab on ground
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A) Corrosion B) Repeated traffic loading near the fatigue limit stress range C) Temperature fluctuations D) Over-design Answer: B Explanation: Cyclic stresses from traffic can initiate fatigue cracks if they exceed the fatigue limit. Question 19. In a truss bridge, the method of joints assumes that: A) Members are flexible and deform under load B) All loads are carried only by the chords C) Joints are pinned and members are axially loaded only D) Bending moments dominate the behavior Answer: C Explanation: The method of joints treats joints as pins, so members experience only axial forces. Question 20. The influence line for a simply supported beam is used to determine: A) Maximum moment due to a moving point load B) Deflection under uniform load C) Shear capacity of the beam D) Natural frequency of vibration Answer: A Explanation: Influence lines show how reactions, shear, or moment vary as a load moves across the span.
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Question 21. In a cable-stayed bridge, the primary structural function of the stay cables is to: A) Provide lateral stability against wind B) Transfer deck loads directly to the towers in tension C) Support the foundations D) Act as a decorative element Answer: B Explanation: Stay cables carry tensile forces from the deck to the pylons. Question 22. The main cable of a suspension bridge primarily experiences: A) Compression B) Bending C) Tension D) Shear Answer: C Explanation: Suspension bridge main cables are tension members supporting the deck. Question 23. A gravity abutment is designed mainly based on: A) Soil bearing capacity and the weight of the abutment itself B) Cantilever action only C) Pile foundations D) Arch action Answer: A Explanation: Gravity abutments rely on their mass and soil bearing to resist loads.
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Explanation: Skin friction in dense sand or stiff clay offers high capacity for driven piles. Question 27. The Rankine earth pressure theory assumes: A) No wall friction B) Full wall friction C) Cohesive soil only D) Variable water table Answer: A Explanation: Rankine’s theory neglects wall friction, providing active and passive pressures based solely on soil weight. Question 28. In a retaining wall design, the factor of safety against overturning is generally required to be at least: A) 0. B) 1. C) 1. D) 2. Answer: C Explanation: A minimum factor of safety of 1.5 is typical for overturning resistance. Question 29. Influence lines are particularly useful for determining the design of which bridge component under moving loads? A) Deck waterproofing B) Expansion joints C) Maximum shear and moment in girders D) Bearing lubrication
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Answer: C Explanation: Influence lines help locate maximum shear and moment due to moving traffic. Question 30. Grid analysis in multi-girder bridges is employed to: A) Determine the color scheme of the bridge B) Distribute loads among longitudinal girders based on stiffness C) Calculate wind pressure on the deck D) Design the bridge’s lighting system Answer: B Explanation: Grid analysis allocates loads to girders according to their relative stiffness. Question 31. In finite element modeling of a bridge, which element type is most appropriate for representing a continuous concrete slab? A) Truss element B) Beam element C) Shell element D) Rigid link Answer: C Explanation: Shell elements can capture both bending and membrane actions of slabs. Question 32. The first natural frequency of a simply supported steel girder bridge is primarily governed by: A) Material density only B) Span length, stiffness, and mass distribution C) Color of the paint
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D) Covered with asphalt Answer: B Explanation: Appropriately sized riprap resists hydraulic forces and protects against scour. Question 36. Routine bridge inspections according to the National Bridge Inspection Standards (NBIS) are required at minimum every: A) 1 year B) 2 years C) 5 years D) 10 years Answer: B Explanation: NBIS mandates a thorough inspection at least once every two years. Question 37. The condition rating for a bridge deck that shows minor cracking but no loss of structural capacity is typically: A) 0 (failed) B) 2 (poor) C) 6 (fair) D) 9 (excellent) Answer: C Explanation: Minor cracking usually yields a fair rating (around 6) indicating maintenance is needed. Question 38. Alkali-silica reaction (ASR) in concrete primarily leads to: A) Increased compressive strength B) Expansion and cracking of concrete
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C) Corrosion of reinforcing steel D) Reduced thermal conductivity Answer: B Explanation: ASR causes deleterious expansion, producing map-like cracking. Question 39. Carbon fiber-reinforced polymer (CFRP) strengthening of a concrete girder is most effective for: A) Improving shear capacity only B) Enhancing flexural strength and stiffness with minimal added weight C) Replacing the need for bearings D) Providing corrosion protection for steel Answer: B Explanation: CFRP wraps increase flexural capacity while adding little weight. Question 40. In a Bridge Management System (BMS), the primary data input for prioritizing rehabilitation is: A) Color of the bridge paint B) Structural condition ratings and traffic importance factor C) Number of nearby restaurants D) Age of the bridge only Answer: B Explanation: BMS uses condition ratings combined with functional importance to set priorities. Question 41. Which classification of bridge is defined by the primary load-carrying element being a set of tensioned cables anchored at both ends? A) Arch bridge
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A) Excessive deflection of the deck B) Compression of stay cables C) Tensile stresses in the arch rib D) Buckling of the arch rib Answer: C Explanation: If the thrust line exits the arch, the arch experiences tension, which it cannot resist. Question 45. For a segmental box girder bridge, the primary advantage of post-tensioning each segment is: A) Reducing construction time by eliminating formwork B) Allowing the bridge to be built without any temporary supports C) Providing continuous prestress across segment joints, enhancing overall stiffness D) Eliminating the need for expansion joints Answer: C Explanation: Post-tensioning creates continuity and stiffness across segmental joints. Question 46. The most common cause of bearing failure in bridges is: A) Over-tightening of bolts B) Excessive rotation leading to edge wear and loss of load transfer C) Painting the bearing surface D) Using stainless steel fasteners Answer: B Explanation: Rotational movement can wear bearing surfaces, causing loss of function.
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Question 47. In the context of bridge hydrology, “backwater effect” refers to: A) Water flowing upstream due to wind B) Rise in upstream water level caused by the bridge constriction C) Evaporation from the water surface D) Sediment deposition downstream Answer: B Explanation: The bridge reduces channel capacity, causing water to back up upstream. Question 48. A typical design value for the coefficient of thermal expansion for steel in bridge design is: A) 5 × 10⁻⁶ /°C B) 10 × 10⁻⁶ /°C C) 15 × 10⁻⁶ /°C D) 20 × 10⁻⁶ /°C Answer: B Explanation: Steel expands about 10 μm/m per degree Celsius. Question 49. In a composite steel-concrete deck, the concrete slab primarily contributes to: A) Shear transfer between girders B) Providing tensile capacity to the system C) Increasing dead load only D) Acting as a fire-proof barrier only Answer: A Explanation: The concrete deck works with shear studs to transfer shear between the steel girder and deck.
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Explanation: Cantilever arms develop bending moments to support loads. Question 53. The most appropriate analysis method for a bridge subjected to a moving train load is: A) Static load factor method only B) Influence line method combined with dynamic amplification factor C) Simple beam theory D) Thermal expansion analysis Answer: B Explanation: Moving train loads require influence lines and dynamic amplification to capture peak effects. Question 54. In foundation design, the term “skin friction” refers to: A) Friction between pile and surrounding soil along the pile shaft B) Friction between the deck and the girders C) Friction in the bearing plates D) Friction between the river water and the pier Answer: A Explanation: Skin friction is the shear resistance along the length of a pile. Question 55. The primary purpose of a guide bank downstream of a bridge pier is to: A) Provide aesthetic landscaping B) Direct debris and flow away from the pier to reduce scour C) Support the bridge’s lighting system D) Increase the bridge’s vertical clearance
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Answer: B Explanation: Guide banks channel flow and protect piers from scour-inducing turbulence. Question 56. In a multi-span continuous beam, the location of maximum negative moment typically occurs: A) At the mid-span of each span B) At the supports (pier locations) C) At the abutments only D) At the deck surface Answer: B Explanation: Continuous beams develop negative moments over supports. Question 57. The term “fatigue limit” for steel is defined as: A) The stress level below which a material can endure infinite load cycles without failure B) The maximum stress a steel member can support once C) The stress at which steel yields D) The stress caused by temperature changes Answer: A Explanation: Below the fatigue limit, steel theoretically has infinite life under cyclic loading. Question 58. In a bridge’s expansion joint, the “movement capacity” is the: A) Maximum temperature range the joint can tolerate B) Maximum relative displacement the joint can accommodate without damage C) Length of the joint seal D) Number of bolts used in the joint
