Cause Analysis for Shear Crack and Deflection of Long Span Concrete BoxGirder Bridge

Abstract:

The paper presents an analysis of the cause for shear crack and deflection of long span prestressed concrete boxgirder bridge.A comparative study is conducted on the calculation results of a practical project based on 7 freedom space straight beam model considering section warping and space beam grid model. The paper also presents an analysis of the amplification coefficient of shear stresses,and a discussion about the influence on deflection by crack of bottom slab and shear lag effect.

Key words:long span; boxgirder bridge; warping; shear crack; deflection