独柱墩桥梁抗倾覆分析与加固研究

Overturning Resistance Analysis and Reinforcement Research of Single Column Pier Bridges

为减小因车辆偏载、温度作用等可变作用对独柱墩桥梁产生的倾覆破坏,在总结先前学者和专家对独柱墩桥梁抗倾覆分析及加固研究的基础上,以支座反力法和稳定系数法为理论依据,采用Midas/Civil有限元软件对加固后的独柱墩现浇连续箱梁桥进行倾覆稳定性分析。结果表明:两种加固方法都可以提高桥梁的横向抗倾覆性能,采用增设盖梁和支座与采用增设抗拔约束装置加固方法相比,独柱墩支座受压承载力明显减小,稳定系数大幅度提高,独柱墩被加固后的3支座体系可改善桥梁结构受力状态,增设盖梁和支座加固法对独柱墩桥梁抗倾覆安全性优于增设抗拔约束装置加固法。

In order to reduce the overturning damage of single column pier bridges caused by variable effects such as vehicle bias load and temperature,based on the summary of previous scholars and experts'research on overturning resistance and reinforcement of single column pier bridges,it uses the support reaction method and stability coefficient method as theoretical basis,and analyzes the overturning stability of the re-inforced cast-in-place continuous box girder bridge with single column pier by Midas/Civil.The results show that both reinforcement methods can improve the lateral overturning resistance of the bridge.Com-pared with the reinforcement method of adding a cap beam and support,the compression bearing capacity of the single column pier support is significantly reduced,and the stability coefficient is significantly in-creased.These three support systems whose single column pier is reinforced can improve the stress state of the bridge structure.The addition of cap beams and support reinforcement method is superior to the addi-tion of uplifting resistance restraint device reinforcement method in terms of overturning resistance safety of single column pier bridges.