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独柱墩箱梁桥具有视觉通透,外形美观,下部结构工程量小、节约占地等突出优势,但这类桥近年来在使用中接连发生了几起箱梁桥整体侧向倾覆事故,造成了很坏的社会影响。一般来说设计对上部结构强度及刚度重点关注,但关于桥梁上部结构的抗倾覆能力则重视不够,现行规范也未明确提及桥梁上部结构的侧向抗倾覆稳定性要求,客观造成了该类桥事故频发。通过荷载试验和理论计算分析表明该桥在极端荷载条件下存在支座脱空和梁板倾覆的可能,因此采取了预防性加固措施,经过一段时间的运营验证,表明预防倾覆加固达到了预期目标。
The single column girder box girder bridge has the advantages of visual transparency, beautiful appearance, small construction amount of the substructure and land saving, etc. However, in recent years, such bridges have taken place a series of lateral overturning accidents of box girder bridges in succession, Caused a very bad social impact. Generally speaking, the emphasis is placed on the strength and stiffness of the superstructure. However, the anti-overturning capability of the superstructure of the bridge is not enough. The current norms also do not explicitly mention the lateral stability requirements of the superstructure of the bridge. Bridge accident frequent. Through the load test and theoretical calculation and analysis, it shows that under the condition of extreme load, the bridge may have the possibility of bearing stand-off and beam-plate overturning. Therefore, preventive reinforcement measures are taken and after a period of operational verification, it shows that the preventive overturning and reinforcement meet the expected target .