摘要
文中利用有限元软件建立了某6孔大悬臂预应力连续箱梁桥模型,以分析该桥腹板、顶底板及翼板出现裂缝的原因。通过对不同工况下受力情况分析比较,结果表明,腹板出现裂缝主要原因为竖向预应力的损失较大,从而产生了较大的剪切拉应力;底板及翼板出现裂缝主要原因为在钢束及横向预应力作用下,箱梁底板中部和翼缘板下缘出现较大主拉应力。因此,可在裂缝产生区域采用"主动加固+被动加固"的措施,主动加固采用增设体外预应力束,被动加固采用在腹板处粘贴钢板及碳纤维布的加固法,顶底板采用碳纤维布加固法,翼板处采用裂缝修补胶封闭法。
A six-hole prestressed large cantilever continuous box girder bridge model was established by using finite element software. The causes of cracks in the web, roof and wing of the bridge were analyzed. Through the analysis and comparison of the stress conditions under different working conditions, the results show that the loss of vertical prestress is large, resulting in large shear tensile stress, which is the main cause of web cracks. Under the action of steel bundle and transverse prestressing, the main tensile stress in the middle of the box girder bottom plate and the main tensile stress at the lower edge of the flange plate are both large, causing the bottom plate and the wing plate to crack. In the crack-producing area, active reinforcement and passive reinforcement are adopted. The active reinforcement adopts the addition of external prestressed beam. The passive reinforcement adopts the method of sticking steel plate at the web, carbon fiber cloth reinforcement on roof and bottom, and crack repair glue sealing method on wing plate.
作者
严松
颜鹏飞
YAN Song;YAN Pengfei(CCCC Second Highway Consultant Co., Ltd., Wuhan 430052, China)
出处
《交通科技》
2019年第4期41-44,共4页
Transportation Science & Technology
关键词
连续梁桥
裂缝
计算分析
主动加固
被动加固
continuous beam bridge
crack
calculation analysis
active reinforcement
passive reinforcement
