Research Of The Application Of The Slant-legged Rigid Frame Bridge Without Abutment To Curved, Ramp Or Skew Bridges

The slant-legged rigid frame bridge without abutment is a new bridge type, which is widely applied to engineering practice, on account of its unique advantages in respect of adaptability, economy and landscaping, in recent years. And it has the very strong promoted value because its inherent structure characteristics enable it to overcome the common diseases of general bridges. Combining the project application, this paper mainly analyzed the structure system and the stress, which were validated by practice. For the typical slant-leg rigid frame bridge without abutment, this paper optimized the span, the girder, the slant leg of the structure, and provide the optimization design.This paper introduced the mechanics characteristic of the skew slant-legged rigid frame bridge without abutment, analyzed the causes of in-plain rotation of skew bridge, then put forward the rotating-resist mechanism of slant-legged rigid frame bridge without abutment. Theoretically "the fixed point" and "the rotation center" is derived, which derived its plane displacement formula. The theoretical calculation result indicated that, compared with other types of skew bridges, slant-legged rigid frame bridge without abutment, on account of its unique structure, can effectively restrict in-plain displacement, and thus can ensure the safety of structure.For the typical skew slant-legged rigid frame bridge without abutment, this article uses the MIDAS software, established the model of skew slant-legged rigid frame bridge without abutment model with different skew angles, and made analysis on loading conditions and stiffness of structure from the aspects of stress level and structural displacement.Based on the practical projects, dynamical and statical load test study is made on the skew slant-leggd rigid frame bridge without abutment, which validated the theoretical analysis and verification of the above sections. Expected these research results may enrich the design theory of the skew slant-legged rigid frame bridge without abutment, and provide valuable reference for the engineering application of the skew slant-legged rigid frame bridge without abutment.