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根据有限元软件和内蒙古某座拱桥参数,用beam3二维梁单元模拟波纹钢板,用plan42二维实体单元模拟回填土体,建立了考虑回填高度与拱圈相互作用的平面模型,计算了不同回填高度下的拱圈弯矩和轴力,分析了回填高度对拱圈应力和变形的影响。计算结果表明:在对称回填施工过程中,拱圈最大径向绝对位移约为0.9 mm,拱圈最大、最小应力分别约为10-、27 MPa;在不对称回填施工过程中,拱圈最大径向绝对位移约为1.4 mm,拱圈最大、最小应力分别约为12、-18 MPa,且最大径向绝对位移和最大应力均出现在拱圈右侧的1/8跨度附近。在回填施工过程中,应重点监控拱圈右侧1/8跨度附近拱圈的应力和变形。
According to the finite element software and the parameters of a certain arch bridge in Inner Mongolia, the beam3 is used to simulate the corrugated steel plate and the plan42 two-dimensional solid element is used to simulate the backfill of soil. The plane model considering the interaction between backfill height and arch ring is established. The arch moment and the axial force at the height, the effect of backfill height on the stress and deformation of the arch was analyzed. The results show that during the construction of symmetrical backfill, the maximum radial absolute displacement of the arch ring is about 0.9 mm, the maximum and minimum stress of the arch ring are about 10- and 27 MPa, respectively. During the asymmetrical backfill construction, the maximum diameter of the arch ring The absolute displacement is about 1.4 mm, and the maximum and minimum stress of the arch ring are about 12 and -18 MPa, respectively. Both the maximum radial absolute displacement and the maximum stress appear in the vicinity of the 1/8 span on the right side of the arch ring. In the process of backfilling, the stress and deformation of the arch ring near the 1/8 span on the right side of the arch ring should be monitored.