Experimental study on mechanical properties of joint structures in negative moment zone of simply supported to continuous steel-concrete composite beam
Based on one simply supported to continuous steel-concrete composite beam bridge project in China,two test beams SCB-1 and SCB-2 with continuous sections of concrete beams in the negative bending moment zone were designed.The mechanical properties of the two beams under different loads were studied by laboratory tests.At the same time,the torsion phenomenon of the component during the test was analyzed by finite element method.The results show that the failure mode of the test beam under the ultimate load is that the steel bar yields first,and the force of the connecting bolts of the beam in the negative moment zone is about 220MPa,which meets the requirements of use.The cracks of the test beam are mainly concentrated in the calculated span range of 1/5～1/3 on both sides of the middle line of the beam,which is the key area of crack resistance of the member.The joint effect of eccentric load and uneven support should be avoided as much as possible in the design process of the component;the torsion phenomenon reduces the overall mechanical properties of the component by about 20%,and it is recommended to increase the transverse connection stiffness in actual engineering.
simply supported to continuous steel-concrete composite beamnegative moment zone structuremechanical propertiesload testcomponent torsion
NETL
NSTL
维普
万方数据
