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为了对比单肢箱形薄壁高墩与双肢矩形薄壁高墩在不同荷载工况下的线弹性稳定性与非线性弹塑性稳定性,以吕梁环城高速公路机场2号大桥为工程背景,采用Ansys10.0软件建立有限元模型,研究了温度、风荷载、墩顶弯矩、汽车制动力、施工缺陷等因素对2类高墩初始几何缺陷的影响程度,分析了纵桥向、横桥向和双向初始几何缺陷对2类高墩稳定性的影响。研究结果表明:单肢箱形薄壁截面高墩的线弹性稳定性比双肢矩形薄壁截面高墩好;日照、风载、汽车制动力等因素对单、双肢薄壁高墩纵、横桥向位移影响并不相同;双向初始几何缺陷对结构的弹塑性稳定性影响最大,在相同的双向初始几何缺陷下,单肢箱形薄壁高墩稳定性系数的降幅比双肢矩形薄壁高墩大。
In order to compare the linear elastic stability and nonlinear elastic-plastic stability of thin-walled single-walled high pier and double-limb rectangular thin-wall high pier under different load conditions, taking Luliang Huancheng Expressway Airport No.2 Bridge as the engineering background , Ansys10.0 software was used to establish the finite element model. The influences of temperature, wind load, pier bending moment, braking force and construction defects on the initial geometric defects of two types of high piers were studied. Influence of bridge and bidirectional initial geometric defects on the stability of two types of high piers. The results show that the linear elastic stability of the high piers with single-limb box-shaped thin-walled sections is better than that of the high-pier with rectangular thin-walled sections. The effects of sunshine, wind load and braking force on the longitudinal, The effect of transverse bridge on displacement is not the same. The bidirectional initial geometric defects have the greatest influence on the elasto-plastic stability of the structure. Under the same two-way initial geometric imperfection, the stability coefficient of single- Wall high pier.