Vol.54A(20083) Study on load transfer mechanismof the joint in hybrid truss bridge *************** Yuji Sato, Shin-ichi Hino, Yoshimi Sonoda, Kohei Yamaguchi, Seong Bong Cheon *,810-00732-2-11 **,819-0395744 ***,819-0395744 ****,819-0395744 *****G.I.F. Co., LTD, (1107-1, Bisan-dong, Dongan-Gu, Anyang-Si, GyeongGi-Do, South Korea As the joint structureof steel-concrete hybrid truss bridge, various structural types havebeen proposed and put to practical useup to now. In this study, two kinds of joint structures with perfobond shear connector and welded headed studs have been proposed. And the loading test in half scale specimens of the joint structure has been carried out to clarify the stress transfer mechanismof the joint structure. As the result, it has been clarified that the design strength on the existing ultimate strength equation for the joint has been enough safety. Moreover, the 3-D finiteelementmethodhasbeenconducted,andthemechanicalcharacteristichasbeen examined. In this paper, it was indicated the stress transfer mechanismand the load carrying capacity of the joint structure. KeyWords:hybridtrussbridge,jointstructure,perfobondshearconnector,welded headed stud, gusset 1 PC1 -1 PrestressedCompositeTruss GirderPCT 2PCRC 1RC-2 ab -1 -778- 2PC 3 -233 2 2.1 1/268.78m5.0m-3 -1 500mm400mm2400mm216.2mm8.2mmD194D13100mm -1 TYPE1-1TYPE1-2TYPE23TYPE1-2TYPE1-1-1 24001370400104061.1216.38.217517562000kN-3 mm -1 -4 19190600PL =12216.3PL =123@70=21028652519075 3@150=450 75216.3PL =12PL t=12808050502608067.562.5525D19 30 30 D10 28675 136 75 75 7560039027090 90TYPE1-2mm aTYPE1-1bTYPE2 -779- TYPE1-22 -4 30mmD102D1919190mm16 -2 STK490 SM400SD295A 2.2 -3 2000kN 3 -5 PT CS TYPE2M 3.1 TYPE1-1TYPE1-2TC142 ( ) { } 1 . 26 45 . 12 ' 2 2 + =st stcust udf f d V 1 ) (N/mm : , ) (N/mm: , (mm) :(mm) : , (N :2 2' stcustudffd V ( ) 0 . 488 51.02 ' 2 2< +