预应力混凝土弧形腹板箱梁空间受力分析

弧形腹板箱梁由于其大悬臂、大宽跨比的特点,结构受力与变形空间效应突出,采用单一的平面杆系模型不能完全把握结构的受力特性。为此,结合萧山东入城口环境综合整治工程中主线高架的某三跨预应力混凝土连续箱梁,利用ANSYS建立全桥三维有限元实体模型,分析了箱梁弧形腹板对截面抗剪的影响、在荷载作用下箱梁剪力滞系数和偏载系数的分布情况,计算结果为工程设计提供了技术支撑。

Spatial Analysis ofPrestressed Concrete Box Girder with Arc-shape Web

Due to the long cantilevered flanges and the large width-span ratio,the box girder with arc-shape web always has complex special behavior.The mechanical characteristics of this type bridge can’t be accurately grasped by plate girder element theory.With reference to a three-span continuous prestressed concrete box girder in the urban viaduct of the environment rehabilitation project in the east-entrance of Xiaoshan City,this paper studied the shear influence by the arc-shape web,the distribution rule of the shear lag coefficients and the eccentric load coefficients,using 3D solid model with ANSYS to support the engineering design.