| 摘要 |
<P>PROBLEM TO BE SOLVED: To restrain a vertical displacement at a center of a span while alleviating influence on a substructure even without changing sectional performance of a bridge girder. <P>SOLUTION: In a bridge structure where both edges of a bridge girder 10 are supported by abutments 20, the both edges of the bridge girder 10 supported by the abutments are extended outward from the respective abutments and edge sections 11 of the extended portions 10B are restrained by auxiliary restraining means 30 so as to restrain the extended portions 10B from being weighed up. A value n in L'=L/n, where L' is a side span length of the extended portion 10B and L is a span length between bearings at the both edges of the bridge girder 10, is set in a range of 3 to 10. The edge sections 11 of the expended portions 10B are fixed to concrete subgrade 50 by anchor bolts 31 and provided with counter weights 35 as the auxiliary restraining means. <P>COPYRIGHT: (C)2012,JPO&INPIT |
