Abstract Joint bending stiffness is an important parameter for the design of precast prestressed utility tunnel, and at present, there is still no extant test data or formulae. It puts forward the mechanical assumptions according to the structural characteristics of the utility tunnel joints, in which the joint section is assumed to be a non-deformable rigid plate, while the elastic gasket and prestressed tendons are abstracted into springs. And on this basis, the mechanical model is established. A non-linear equation for joint bending stiffness is derived according to deformation compatibility and stress equilibrium equations. The accuracy of the joint mechanical model and the stiffness expression is verified by comparison with the results of the joint stress test. Finally, the sensitivity of the factors influencing the bending stiffness of the joints is analyzed by using the established model, and the results can provide guidance and reference for the design of precast prestressed utility tunnels.
Abstract：
Joint bending stiffness is an important parameter for the design of precast prestressed utility tunnel, and at present, there is still no extant test data or formulae. It puts forward the mechanical assumptions according to the structural characteristics of the utility tunnel joints, in which the joint section is assumed to be a non-deformable rigid plate, while the elastic gasket and prestressed tendons are abstracted into springs. And on this basis, the mechanical model is established. A non-linear equation for joint bending stiffness is derived according to deformation compatibility and stress equilibrium equations. The accuracy of the joint mechanical model and the stiffness expression is verified by comparison with the results of the joint stress test. Finally, the sensitivity of the factors influencing the bending stiffness of the joints is analyzed by using the established model, and the results can provide guidance and reference for the design of precast prestressed utility tunnels.
WANG Xueliang1 WANG Pengyu2 WANG Shuhong2 Alipujiang Jierula2
.Study on the Bending Mechanics of Precast Prestressed Utility Tunnel Joints[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(1): 134-140
2021, Vol. 58 