MECHANICAL BEHAVIOR OF IMMERSION JOINT SUBJECTED TO AXIAL LOADING

摘要

Generally, mechanical behaviors of immersion joint, which can be studied by simplified calculation model, are of importance for immersed tunnel subjected to seismic action.How to choose proper parameters is the key principle for modeling.Therefore,experiments are needed to obtain the behaviors and parameters of immersion joint.This article studies the flexural properties of an immersion joint subjected to horizontal pseudo-static force.A series of tests are conducted, considering the functions of GINA gasket and longitude limited device.In an effort to explore systematic axial and transversal performance of immersion joint, five types of bending-compression loading cases are performed.The property of GINA gasket is proven quite significant in mechanical performance of immersion joint.The flexural stiffness of immersion joint increases along with that of GINA gasket which results in reducing the opening deformation of the joint.The GINA gasket tends to accumulate deformation after each case.Rotations of the joint are observed non-linearly increasing with bending moment, whether it is pushed forward or inverse to bend.