摘要
以广东省某高速公路桥梁在不平衡堆土作用下的桥墩偏位为工程实例,为分析结构受力状况并提供病害处置理论数据支撑,开展了堆载作用下的桥墩偏位分析及安全评估研究。依托病害桥墩专项检测工程的支座滑移量和桥墩偏位测量结果,推断桩顶位移,利用有限元软件MIDAS/Civil模拟分析在上部结构恒载和不平衡土压力作用下的结构位移及内力大小,根据规范公式验算墩底截面裂缝宽度和桩基最不利截面裂缝宽度及承载能力。结果表明:1)墩顶位移有限元计算结果与专项检测支座滑移量基本一致,模型能较好地反应结构真实受力状态;2)墩底和桩基最大裂缝宽度超过规范限值,分别为0.398mm和1.218mm,裂缝宽度验算不满足规范要求;3)桩基在偏心压力作用下的正截面抗压承载能力严重不足,无法满足设计要求,需进行加固设计。
The paper takes the deflection of bridge piers of a highway bridge in Guangdong Province under the action of unbalanced mounding as an engineering example, and carries out a study on the analysis of the deflection of bridge piers under the action of mounding and safety assessment in order to analyze the structural force condition and provide theoretical data support for disease disposal. Relying on the support slip and pier deflection measurement results of the special inspection project of the diseased bridge pier, the pile top displacement is inferred, and the structural displacement and internal force under the action of constant load and unbalanced soil pressure of the superstructure are simulated and analyzed by the finite element software MIDAS/Civil. The results indicate that: 1) The finite element calculation results of the displacement of the top of the pier and the special test bearing slip are basically the same, and the model can better reflect the real force situation of the structure;2) The maximum crack width of pier bottom and pile foundation exceeds the specification limit, which is 0.398mm and 1.218mm respectively, and the crack width verification does not meet the specification requirements;3) The positive cross-sectional compressive bearing capacity of pile foundation under eccentric pressure is seriously insufficient to meet the design requirements, and reinforcement design is required.
作者
马伟
林志春
MA Wei;LIN Zhichun(Guangdong Jiaoke Testing Co.,Ltd.,Guangzhou 510420,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S02期2635-2641,共7页
Building Structure
关键词
堆载
桥墩偏位
有限元
裂缝宽度
承载能力
安全评估
stacked load
bridge pier deflection
finite element
crack width
load carrying capacity
safety assessment
