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Load Bearing Capacity Evaluation of New Lattice Girder by Laboratory Test
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 Title & Authors
Load Bearing Capacity Evaluation of New Lattice Girder by Laboratory Test
Choi, Young-Nam; Jang, Yeon-Soo; Kim, Dong-Gyu; Bae, Gyu-Jin;
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Recently, the depth of tunnel constructed is getting deeper, which increases difficulty in construction works. Deliberate tunneling techniques are needed as the span and length of tunnels are increased. As one of the technical developments for tunnel, U-shaped and reinforced spider lattice girders are developed by optimizing the spider used in 95mm lattice girder as tunnel steel ribs. In order to evaluate the load bearing capacity of the lattice girder, the 4-point flexural tests are carried out. For the laboratory tests, straight specimens are made for the existing lattice girder and the new lattice girder. The results of the flexural tests showed that the maximum load bearing capacity of the new lattice girders was higher than the traditional one. The load-displacement behavior of the test specimens showed the elasto-plastic behavior in the existing lattice girder and the stress softening behavior in the new lattice girder. It was found that the load bearing capacities are changed depending on the location of the loading points.
Lattice girder;U-shaped spider;reinforced spider;4 point flexural test;Load bearing capacity;
 Cited by
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