| Title |
A Study on Load Bearing Capacity of Composite Member with Steel Rib and Shotcrete in NATM Tunnel |
| Authors |
문상화(Moon, Sang Hwa) ; 신영완(Shin, Young Wan) ; 김승환(Kim, Seung Hwan) ; 유한규(Yoo, Han Kyu) |
| DOI |
https://doi.org/10.12652/Ksce.2012.32.5C.221 |
| Keywords |
강지보;숏크리트;하중 부담률;하중지지력 Steel rib;shotcrete;load sharing ratio;load bearing capacity |
| Abstract |
Steel ribs such as H-beam or lattice girder are often reinforced to secure the stability of NATM tunnel when the ground is in the bad condition. When designing, however, steel ribs are not often taken into consideration on the numerical analysis when they are regarded as temporary tunnel supports until shotcrete shows its best performance or if they are, there are various modeling methods. This study shows behavior and loading capacity of steel ribs and shotcrete through the strength test on the bending, pressure and full-scaled. Also, we conducted and analyzed the experiment of composite member consisting of shotcrete and steel ribs under the same condition. Through the result, we can find the fact that shotcrete and steel ribs do not work as one unit because of slipping on the boundary. Also, when numerical analyzing, it was concluded that steel ribs cover all bending moment and shotcrete and steel ribs share with axial force according to the compressive strength. |