简支T梁桥平板型桥面连续受力特性研究OA

This study aimed to address the reduced durability and corrosion issues of traditional multi-span sim-ply supported beam bridges caused by concrete cracking and design flaws.A novel steel-concrete composite flat slab continuous bridge deck structure(referred to as the flat slab continuous)is proposed,which effectively pre-vents surface cracking by keeping the surface concrete to compression under positive bending moments.With a three-span simply supported beam bridge as the engineering context,this research conducted finite element nu-merical simulation on the deformation and force characteristics of the flat slab continuous and the traditional tie-rod continuous simply supported beam bridges under various vehicle loads by establishing a detailed finite ele-ment model.The results indicate that under mid-span load and off-center load,the maximum tensile stresses for the traditional tie-rod continuous were 1.16 MPa and 4.50 MPa,respectively,in contrast,the upper surface of the novel flat slab continuous was in compression.Furthermore,comparative analysis shows that under overload and anti-tipping conditions,the deflection difference at the mid-span cross-section of the main beam for the flat slab continuous simply supported beam bridge was reduced by 24.50%and 13.43%,respectively.The findings dem-onstrate that the flat slab continuous can effectively prevent the occurrence of deck cracking and has a significant advantage in improving the bridge's anti-tipping performance,offering a new perspective for the design and ret-rofitting of multi-span simply supported beam bridges.