General Purpose Truss

James Thomas Engineering offers several different truss designs and truss systems for any type of event, conference or show. Some of our most common trusses are our general purpose trusses. The general purpose truss systems that we manufacture range from 12” by 12” to 20.5” by 20.5”. These truss systems are suitable for the majority of lighting applications, flying P.A. systems and any other general purpose use.

The GP truss systems are constructed out of aluminum tubing. By using this strong lightweight metal, our truss designs are perfect for conference, exhibition, and small venue work. With the available accessories, these GP Truss Systems can give your next conference or exhibition that professional look and feel.

With the extremely flexible James Thomas Engineering truss design, we are able to offer pre-rigged GP Truss systems. Also made from lightweight aluminum tubing, each truss is designed to carry 2 lighting bars complete with lanterns. With the lighting bars designed to store inside of the GP truss, it reduces the amount of space needed for storage. Depending on the size of your GP truss section, you can hold up to 2 bars of 4 lanterns! This entire system, along with nearly all James Thomas Engineering truss designs, can be used with our ground support system by using suitable sleeve blocks and towers.

For more information on our general purpose truss designs or any of our other truss systems, please contact us today at 865-692-3060 or e-mail us at salesus@jthomaseng.com

 

GP 12″ X 12″

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum Deflection
Inches (mm)
Loads
Pounds (kgs)
Maximum Deflection
Inches (mm)
10 (3.048)6140 (2785)0.276 (7)4497 (2040)0.315 (8)
20 (6.096)3100 (1406)1.10 (28)1550 (703)1.10 (28)
30 (9.144)1726 (783)2.21 (56)864 (392)2.21 (56)
40 (12.192)855 (388)2.96 (75)428 (194)2.96 (75)

GP 18″ x 12″

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
10 (3.048)6140 (2785)0.276 (7)4497 (2040)0.20 (8)
20 (6.096)3100 (1406)1.10 (28)1550 (703)1.10 (28)
30 (9.144)1726 (783)2.20 (56)864 (392)2.20 (56)
40 (12.192)855 (388)2.95 (75)427 (194)2.95 (75)
50 (15.24)425 (193)3.70 (94)214 (97)3.70 (94)

GP 15″ x 15″

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
10 (3.048)9200 (4173)0.17 (4)4600 (2086)0.17 (4)
15 (4.572)6100 (2766)0.38 (9)3050 (1383)0.38 (9)
20 (6.096)4500 (2041)0.67 (17)2250 (1020)0.67 (17)
25 (7.62)3500 (1587)1.04 (26)1750 (793)1.04 (26)
30 (9.144)2900 (1315)1.50 (38)1450 (657)1.50 (38)
40 (12.192)2000 (907)2.67 (67)1000 (453)2.67 (67)
50 (15.24)1300 (589)*3.75 (95)650 (294)*3.75 (95)
55 (16.76)1000 (453)*4.13 (104)500 (226)*4.13 (104)

GP 20.5″ x 20.5″

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
10 (3.048)5741* (2604)1.06 (27)2870* (1302)1.06 (27)
20 (6.096)5741* (2604)1.06 (27)2870* (1302)1.06 (27)
30 (9.144)3715* (1685)1.57 (40)1858 (843)1.57 (40)
40 (12.192)2643 (1199)2.44 (62)1322 (600)2.44 (62)
50 (15.24)1911 (867)3.70 (94)957 (434)3.70 (94)

GP 20.5″ X 30″

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Allowable Load Data empty Pre-rigged SupertrussMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
10 (3.048)5646 (2561)*0.236 (6)5646 (2561)*0.315 (8)
20 (6.096)5646 (2561)*0.236 (6)5646 (2561)*0.315 (8)
30 (9.144)5562 (2523)*0.709 (18)4202 (1906)0.709 (18)
40 (12.19)4127 (1872)1.65 (42)2063 (936)1.65 (42)
50 (15.24)3150 (1429)2.05 (52)1574 (714)2.05 (52)
60 (18.29)2460 (1116)2.80 (71)1230 (558)2.80 (71)
70 (21.34)1953 (886)3.66 (93)976 (443)3.66 (93)
Loading figures show maximum loads between supports in addition to self weight of truss. Information extracted from structural report by The Broadhurst Partnership. * Denotes load limited to suit maximum shear capacity. All loads include a 20% overload factor for dynamic effects.

GP Pre-Rigged Truss

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Allowable Load Data empty Pre-rigged Maximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
7'-7" Sections
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
2) 15.17 (4.62)
6980 (3166)*0.63 (16)4691 (2128)0.945 (24)
3) 22.75 (6.93)6138 (2784)1.26 (32)3069 (1392)1.26 (32)
4) 30.33 (9.25)4458 (2022)1.69 (43)2229 (1011)1.69 (43)
5) 37.92 (11.56)3395 (1540)2.09 (53)1698 (770)2.09 (53)
6) 45.5 (13.87)2676 (1214)2.72 (69)1338 (607)2.72 (69)
7) 53.08 (16.18)2134 (968)3.66 (93)1067 (484)3.66 (93)
8) 60.67 (18.5)1671 (758)4.72 (120)836 (379)4.72 (120)
Loading figures show maximum loads between supports in addition to self weight of truss. Information extracted from structural report by The Broadhurst Partnership. * Denotes load limited to suit maximum shear capacity. All loads include a 20% overload factor for dynamic effects.
Allowable Load Data fully loaded Pre-rigged Maximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
7'-7" Sections
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
2) 15.17 (4.62)
6737 (3056)*0.63 (16)4572 (2074)0.945 (24)
3) 22.75 (6.93)5774 (2619)1.26 (32)2888 (1310)1.26 (32)
4) 30.33 (9.25)3977 (1804)1.69 (43)1989 (902)1.69 (43)
5) 37.92 (11.56)2791 (1266)2.09 (53)1396 (633)2.09 (53)
6) 45.5 (13.87)1951 (885)2.72 (69)977 (443)2.72 (69)
7) 53.08 (16.18)1289 (585)3.66 (93)646 (293)3.66 (93)
8) 60.67 (18.5)703 (319)4.72 (120)353 (160)4.72 (120)
Loading figures show maximum loads between supports in addition to self weight of truss. Information extracted from structural report by The Broadhurst Partnership. * Denotes load limited to suit maximum shear capacity. All loads include a 20% overload factor for dynamic effects.

GP 12″ Triangle

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum Deflection
Inches (mm)
Loads
Pounds (kgs)
Maximum Deflection
Inches (mm)
10 (3.048)5058(2294)0.41 (10.41)2529 (1147)0.41 (10.41)
20 (6.096)2323* (1053)1.50 (38.10)1452 (658)1.50 (38.10)
30 (9.144)1032* (468)2.25 (57.15)654 (292)2.25 (57.15)
40 (12.192)580* (263)3.00 (76.20)363 (164)3.00 (76.20)

GP 18″ Triangle

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum Deflection
Inches (mm)
Loads
Pounds (kgs)
Maximum Deflection
Inches (mm)
20 (6.096)2730(1238)0.43 (10.9)1365 (619)0.43 (10.9)
30 (9.144)1730 (784)0.92 (23.3)865 (392)0.92 (23.3)
40 (12.192)1206(547)1.54 (39.1)603 (273)1.54 (39.1)
50 (15.24)804* (364)2.01 (51.1)402* (182)2.01 (51.1)
*Denotes load which have been limited for reduced stress due to the slenderness of the girder.

GP 23 1/4″ Triangle

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Allowable Load DataMaximum Allowable Uniform LoadsMaximum Allowable Center Point Loads
Span
feet (meters)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
Loads
pounds (kgs)
Maximum deflection
inches (mm)
10 (3.048)5600+ (2540)0.1 (2)2800+ (1270)0.1 (2)
15 (4.572)5600+ (2540)0.34(8)2800+ (1270)0.34 (8)
20 (6.096)4700 (2131)0.70 (17)2350 (1065)0.70 (17)
25 (7.62)3700 (1678)1.09 (27)1850 (839)1.09 (27)
30 (9.144)3000 (1360)1.57 (39)1500 (680)1.57 (39)
40 (12.192)2100 (952)2.8 (71)1050 (1065)2.8 (71)
50 (15.24)1300* (589)3.75 (95)650* (294)3.75 (95)
60 (18.288)1300 (589)700* (317)4.50 (114)350* (158)4.5 (114)
Loading figures show maximum loads between supports in addition to self weight of truss. Information extracted from structural report by Jessie Mise. + Denotes load limited to suit maximum shear capacity. * Denotes load limited to a maximum deflection of (span/160). All loads include a 20% overload factor for dynamic effects.