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M4.18 (Sl units) A bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature (assumed 20°C). Expansion joints will be provided to compensate for the change in length in the girders as the temperature varies. Each expansion joint can compensate for a maximum of 20 mm of change in length. From historical records it is estimated that the minimum and maximum temperatures in the region wll be-35°C and 40°C, respectively. Determine (a) the minimum number of expansion joints required. Use Table 4.1from the book for reference. Round to the nearest whole number of joints. Table 4.1 Volumetric properties in U.S. customary units for selected engineering materials Coclicient of Thermal Expansion, a Cx10F10 Melting Point, T Density, p g/em Material Metals Aluminum 2.70 (0.098) (13.3) 660 (1220) 24 Copper 8.97 (0.324) 17 1083 (1981) (94) Iron 7.87 (0.284) 12.1 (6.7) 1539 (2802) Lead 11.35 (0.410) 29 (621) (16.1) 327 Magnesium 1.74 (0.063) 26 (144) 650 (1202) Nickel 8.92 (0.322) 13.3 (7.4) (2651) 1455 Steel (0.284) 7.87 12 (6.7) a Tin 7.3 (0.264) 23 (12.7) 232 (449) Titanium 4.51 (0.163) 8.6 (4.7) 1668 (3034) Tungsten 19.30 (0.697) 4.0 (2.2) 3410 (6170) Zinc 7.15 (0.258) 40 (22.2) 420 (787) Ceramics and Silicon Glass 2.5 (0.090) 1.8-9.0 (1.0-5.0) Alumina 3.8 (0.137) 9.0 (5.0) 2072 (3762) Silica 2.66 (0.096) 0.55 (0.31) 1600 (2912) Silicon 2.33 (0.085) 2.6 (1.4) 1414 (2577) Polymers Phenol resins 1.3 (0.047) 60 (33) Nylon Polyethylene I.16 (0042) 100 (55) 260 (500) 0.92 (0.033) 180 (100) 115 (240) Polystyrene 1.05 (0.038) 70 (39) 240 (464) Polyvinylchloride 140 (0.051) 50 (28) 212 (414) Compiled from. 121.131. 141. 15). and other sources Melting tesmperature depends on composition Low-density polyethylene Chemically degrades at high temperanures because it is a thermosetting polymer, ocher polymers listed are thermoplastic

M4.18 (Sl units) A bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature (assumed 20°C). Expansion joints will be provided to compensate for the change in length in the girders as the temperature varies. Each expansion joint can compensate for a maximum of 20 mm of change in length. From historical records it is estimated that the minimum and maximum temperatures in the region wll be-35°C and 40°C, respectively. Determine (a) the minimum number of expansion joints required. Use Table 4.1from the book for reference. Round to the nearest whole number of joints. Table 4.1 Volumetric properties in U.S. customary units for selected engineering materials Coclicient of Thermal Expansion, a Cx10F10 Melting Point, T Density, p g/em Material Metals Aluminum 2.70 (0.098) (13.3) 660 (1220) 24 Copper 8.97 (0.324) 17 1083 (1981) (94) Iron 7.87 (0.284) 12.1 (6.7) 1539 (2802) Lead 11.35 (0.410) 29 (621) (16.1) 327 Magnesium 1.74 (0.063) 26 (144) 650 (1202) Nickel 8.92 (0.322) 13.3 (7.4) (2651) 1455 Steel (0.284) 7.87 12 (6.7) a Tin 7.3 (0.264) 23 (12.7) 232 (449) Titanium 4.51 (0.163) 8.6 (4.7) 1668 (3034) Tungsten 19.30 (0.697) 4.0 (2.2) 3410 (6170) Zinc 7.15 (0.258) 40 (22.2) 420 (787) Ceramics and Silicon Glass 2.5 (0.090) 1.8-9.0 (1.0-5.0) Alumina 3.8 (0.137) 9.0 (5.0) 2072 (3762) Silica 2.66 (0.096) 0.55 (0.31) 1600 (2912) Silicon 2.33 (0.085) 2.6 (1.4) 1414 (2577) Polymers Phenol resins 1.3 (0.047) 60 (33) Nylon Polyethylene I.16 (0042) 100 (55) 260 (500) 0.92 (0.033) 180 (100) 115 (240) Polystyrene 1.05 (0.038) 70 (39) 240 (464) Polyvinylchloride 140 (0.051) 50 (28) 212 (414) Compiled from. 121.131. 141. 15). and other sources Melting tesmperature depends on composition Low-density polyethylene Chemically degrades at high temperanures because it is a thermosetting polymer, ocher polymers listed are thermoplastic

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter4: Numerical Analysis Of Heat Conduction
Section: Chapter Questions
Problem 4.3DP
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M4.18 (Sl units) A bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature (assumed 20°C). Expansion joints will be provided to compensate for the change in length in the girders as the temperature varies. Each expansion joint can compensate for a maximum of 20 mm of change in length. From historical records it is estimated that the minimum and maximum temperatures in the region wll be-35°C and 40°C, respectively. Determine (a) the minimum number of expansion joints required. Use Table 4.1from the book for reference. Round to the nearest whole number of joints.
Transcribed Image Text:M4.18 (Sl units) A bridge to be fabricated of steel girders is designed to be 500 m long and 12 m wide at ambient temperature (assumed 20°C). Expansion joints will be provided to compensate for the change in length in the girders as the temperature varies. Each expansion joint can compensate for a maximum of 20 mm of change in length. From historical records it is estimated that the minimum and maximum temperatures in the region wll be-35°C and 40°C, respectively. Determine (a) the minimum number of expansion joints required. Use Table 4.1from the book for reference. Round to the nearest whole number of joints.
Table 4.1 Volumetric properties in U.S. customary units for selected engineering materials Coclicient of Thermal Expansion, a Cx10F10 Melting Point, T Density, p g/em Material Metals Aluminum 2.70 (0.098) (13.3) 660 (1220) 24 Copper 8.97 (0.324) 17 1083 (1981) (94) Iron 7.87 (0.284) 12.1 (6.7) 1539 (2802) Lead 11.35 (0.410) 29 (621) (16.1) 327 Magnesium 1.74 (0.063) 26 (144) 650 (1202) Nickel 8.92 (0.322) 13.3 (7.4) (2651) 1455 Steel (0.284) 7.87 12 (6.7) a Tin 7.3 (0.264) 23 (12.7) 232 (449) Titanium 4.51 (0.163) 8.6 (4.7) 1668 (3034) Tungsten 19.30 (0.697) 4.0 (2.2) 3410 (6170) Zinc 7.15 (0.258) 40 (22.2) 420 (787) Ceramics and Silicon Glass 2.5 (0.090) 1.8-9.0 (1.0-5.0) Alumina 3.8 (0.137) 9.0 (5.0) 2072 (3762) Silica 2.66 (0.096) 0.55 (0.31) 1600 (2912) Silicon 2.33 (0.085) 2.6 (1.4) 1414 (2577) Polymers Phenol resins 1.3 (0.047) 60 (33) Nylon Polyethylene I.16 (0042) 100 (55) 260 (500) 0.92 (0.033) 180 (100) 115 (240) Polystyrene 1.05 (0.038) 70 (39) 240 (464) Polyvinylchloride 140 (0.051) 50 (28) 212 (414) Compiled from. 121.131. 141. 15). and other sources Melting tesmperature depends on composition Low-density polyethylene Chemically degrades at high temperanures because it is a thermosetting polymer, ocher polymers listed are thermoplastic
Transcribed Image Text:Table 4.1 Volumetric properties in U.S. customary units for selected engineering materials Coclicient of Thermal Expansion, a Cx10F10 Melting Point, T Density, p g/em Material Metals Aluminum 2.70 (0.098) (13.3) 660 (1220) 24 Copper 8.97 (0.324) 17 1083 (1981) (94) Iron 7.87 (0.284) 12.1 (6.7) 1539 (2802) Lead 11.35 (0.410) 29 (621) (16.1) 327 Magnesium 1.74 (0.063) 26 (144) 650 (1202) Nickel 8.92 (0.322) 13.3 (7.4) (2651) 1455 Steel (0.284) 7.87 12 (6.7) a Tin 7.3 (0.264) 23 (12.7) 232 (449) Titanium 4.51 (0.163) 8.6 (4.7) 1668 (3034) Tungsten 19.30 (0.697) 4.0 (2.2) 3410 (6170) Zinc 7.15 (0.258) 40 (22.2) 420 (787) Ceramics and Silicon Glass 2.5 (0.090) 1.8-9.0 (1.0-5.0) Alumina 3.8 (0.137) 9.0 (5.0) 2072 (3762) Silica 2.66 (0.096) 0.55 (0.31) 1600 (2912) Silicon 2.33 (0.085) 2.6 (1.4) 1414 (2577) Polymers Phenol resins 1.3 (0.047) 60 (33) Nylon Polyethylene I.16 (0042) 100 (55) 260 (500) 0.92 (0.033) 180 (100) 115 (240) Polystyrene 1.05 (0.038) 70 (39) 240 (464) Polyvinylchloride 140 (0.051) 50 (28) 212 (414) Compiled from. 121.131. 141. 15). and other sources Melting tesmperature depends on composition Low-density polyethylene Chemically degrades at high temperanures because it is a thermosetting polymer, ocher polymers listed are thermoplastic
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