EXPERIMENTAL EVALUATION OF PIPE-SHAPE SHEAR CONNECTORS FOR MULTI-BEAM BOX GIRDER BRIDGES

摘要

This study mainly focused on the experimental evaluation of pipe-shape shearconnectors for multi-beam box girder bridges. The multi-beam box girder bridges are astructure to the integration with the box girders placed adjacent to each other. They aregenerally connected by shear keys and loop joints to resist the shear force at theirinterfaces, and lateral tendons for applying the compression force. However, if theintegration effect decreases with time, the relative deflection between adjacent girdersoccurs and it causes the reflective cracks on the deck along the interfaces. Furthermore,the efficiency of constructing multi-beam box girder bridges decreases when loopjoints are used because it is complicated to form the required connections usingcouplers. Therefore, this study evaluated behavior of pipe-shape shear connectorswhich are superior in workability and ductility than loop joints by push-out tests andpull-out tests.