Bridges & Prestressed Concrete interview questions

1. A.heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
2. B.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
3. C.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
4. D.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges

Answer + AI explanation with Pro

1. A.IRC Class A loading
2. B.Pre-tensioning
3. C.Bridge bearings
4. D.Design scour depth

Answer + AI explanation with Pro

1. A.IRC Class A loading — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
2. B.IRC Class A loading — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
3. C.IRC Class A loading — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.IRC Class A loading — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments

Answer + AI explanation with Pro

1. A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
2. B.heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
3. C.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
4. D.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders

Answer + AI explanation with Pro

1. A.Vertical clearance above HFL
2. B.IRC Class 70R loading
3. C.Design scour depth
4. D.Post-tensioning

Answer + AI explanation with Pro

1. A.IRC Class 70R loading — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
2. B.IRC Class 70R loading — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
3. C.IRC Class 70R loading — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
4. D.IRC Class 70R loading — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A

Answer + AI explanation with Pro

1. A.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
2. B.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
3. C.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
4. D.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90

Answer + AI explanation with Pro

1. A.Prestress losses
2. B.Bridge bearings
3. C.Pre-tensioning
4. D.IRC Class 70R loading

Answer + AI explanation with Pro

1. A.Pre-tensioning — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
2. B.Pre-tensioning — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
3. C.Pre-tensioning — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.Pre-tensioning — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges

Answer + AI explanation with Pro

1. A.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
2. B.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
3. C.tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
4. D.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders

Answer + AI explanation with Pro

1. A.Prestress losses
2. B.Post-tensioning
3. C.IRC Class 70R loading
4. D.Design scour depth

Answer + AI explanation with Pro

1. A.Post-tensioning — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
2. B.Post-tensioning — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges
3. C.Post-tensioning — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
4. D.Post-tensioning — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments

Answer + AI explanation with Pro

1. A.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
2. B.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
3. C.strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
4. D.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent

Answer + AI explanation with Pro

1. A.Prestress losses
2. B.Expansion joints
3. C.Design scour depth
4. D.Vertical clearance above HFL

Answer + AI explanation with Pro

1. A.Prestress losses — elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
2. B.Prestress losses — standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges
3. C.Prestress losses — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
4. D.Prestress losses — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec

Answer + AI explanation with Pro

1. A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
2. B.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
3. C.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
4. D.standard two-lane train of 114, 114, 68, 68, 68, 68, 27 and 27 kN axles totalling 554 kN, applied to all permanent bridges

Answer + AI explanation with Pro

1. A.IRC 112
2. B.Pre-tensioning
3. C.Bridge bearings
4. D.Expansion joints

Answer + AI explanation with Pro

1. A.IRC 112 — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
2. B.IRC 112 — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
3. C.IRC 112 — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
4. D.IRC 112 — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges

Answer + AI explanation with Pro

1. A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
2. B.unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
3. C.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
4. D.tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges

Answer + AI explanation with Pro

1. A.Bridge bearings
2. B.Design scour depth
3. C.IRC Class A loading
4. D.IRC 112

Answer + AI explanation with Pro

1. A.Bridge bearings — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
2. B.Bridge bearings — elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
3. C.Bridge bearings — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
4. D.Bridge bearings — tendons in ducts stressed against anchorages after concrete gains strength and then grouted, suited to long-span in-situ and segmental bridges

Answer + AI explanation with Pro

1. A.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
2. B.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
3. C.heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
4. D.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83

Answer + AI explanation with Pro

1. A.IRC 112
2. B.Expansion joints
3. C.Prestress losses
4. D.Post-tensioning

Answer + AI explanation with Pro

1. A.Expansion joints — unified limit state code for concrete road bridges that replaced IRC 21 and IRC 18, using γc 1.5 and γs 1.15 with grades up to M90
2. B.Expansion joints — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A
3. C.Expansion joints — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.Expansion joints — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders

Answer + AI explanation with Pro

1. A.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
2. B.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
3. C.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec

Answer + AI explanation with Pro

1. A.Design scour depth
2. B.Vertical clearance above HFL
3. C.Expansion joints
4. D.Post-tensioning

Answer + AI explanation with Pro

1. A.Vertical clearance above HFL — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83
2. B.Vertical clearance above HFL — IRC 5 raises minimum clearance with discharge, from 600 mm for 3 to 30 cumec up to 1500 mm above 3000 cumec
3. C.Vertical clearance above HFL — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.Vertical clearance above HFL — heavy 700 kN tracked vehicle or 1000 kN seven-axle wheeled train specified for bridges on National and State Highways in addition to Class A

Answer + AI explanation with Pro

1. A.elastic shortening, creep, shrinkage and relaxation in all systems, plus friction and anchorage slip in post-tensioning, totalling about 15 to 20 percent
2. B.IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
3. C.asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83

Answer + AI explanation with Pro

1. A.IRC Class A loading
2. B.IRC 112
3. C.Pre-tensioning
4. D.Design scour depth

Answer + AI explanation with Pro

1. A.Design scour depth — IRC 78 takes normal scour dsm = 1.34 (Db²/Ksf)^(1/3) and maximum scour as 2 dsm at piers and 1.27 dsm at abutments
2. B.Design scour depth — strands tensioned against abutments before concreting and released after hardening so bond transfers force, used for factory precast sleepers and girders
3. C.Design scour depth — asphaltic plug for movements up to about 25 mm, strip seal up to 80 mm and modular joints for larger movements at long viaducts
4. D.Design scour depth — elastomeric pads for spans to about 30 m, POT-PTFE and spherical bearings for heavy loads and large rotations, all per IRC 83

Answer + AI explanation with Pro