Abstract
<p> A new box-girder bridge structure is proposed based on the superior mechanical properties of the ultra high performance concrete (UHPC). The proposed structure is the combination of UHPC and thin-wall box girder with densely distributed diaphragm plates, which can simplify the conventional three-direction prestressed structure into unidirectional (longitudinal) prestressed structure.</p><p> Compared to the traditional concrete continuous box-girder bridge, the superstructure weight of the new bridge structure can be lightened by 50~60%. A trial design and some experimental studies were conducted to study the proposed bridge structure. Results of UHPC beam creep deformation test demonstrated that the creep deformation of the UHPC beam was about 1/5 that of ordinary concrete beam. Results of the UHPC box-girder model test indicated that the post-cracking shear performance of the box-girder could be improved by setting diaphragms.</p>
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