As box girder is the structure constituted by thin plates, security of the structure is greatly influenced by the collapse on compressional flange.
The collapses of flange bring about stress concentration at upper sides of web, morever, if in case o...
As box girder is the structure constituted by thin plates, security of the structure is greatly influenced by the collapse on compressional flange.
The collapses of flange bring about stress concentration at upper sides of web, morever, if in case of the imperfect plate they were increased, tensile stress would occur at the middle point of upper flange and develop collapse failure at upper sides of web and projections of upper flange. The ratio a/b(both side-lengths of plate) of the collapse is decided by the distance of diaphragm, when load is increased up critical load the ratio a/b approaches 0.70.
Designing the box girder, engineers must take into the influences of side stress that imperfects of flange and eccentric load arouse.