Load Rating of Masonry Arch Bridges
Load Rating of Masonry Arch Bridges
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砌体拱桥的荷载等级
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
T. Boothby
中科院分区：
文献类型：
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作者：
T. Boothby
考虑拱圈单位宽度和上覆填土的影响，可以采用框架分析方法对石拱桥进行分析。拱环被分成至少10个段，每个段被赋予与拱环中的材料的特性相对应的横截面特性。拱圈和上覆填土的恒载被视为节点荷载，轴载作为线性变化的压力施加到车架上，基于通过填土的压力的简化分布。支承在竖直方向上是刚性的，在水平方向上是弹性弹簧。弹性弹簧常数随基础类型和弹簧条件的不同而不同。基于对结构施加静载和活载，可以得到整个拱圈的轴向推力和弯矩，并与拱圈的能力估计值进行比较。此过程可用于为结构服务级别找到合适的额定荷载。提供了宾夕法尼亚州亚当斯县一座桥梁的评级实例，以及该结构的验证现场测试结果。
A masonry arch bridge can be analyzed by frame analysis methods by considering a unit width of the arch ring and the overlying fill. The arch ring is divided into at least 10 segments, each of which is given cross-sectional properties corresponding to the properties of the material in the arch ring. The dead load of the arch ring and the overlying fill are considered as nodal loads, and the axle loads are applied to the frame as linearly varying pressures, based on a simplified distribution of pressures through the fill. The supports are considered to be rigid in the vertical direction and elastic springs in the horizontal direction. The elastic spring constant varies depending on the type of foundation and the condition of the springings. Based on this application of dead and live loads to the structure, the axial thrust and moment can be found throughout the arch ring, and compared to an estimate of the capacity of the arch ring. This procedure can be used to find an appropriate load rating for the structure service level. An example rating of a bridge in Adams County, PA, is provided, along with the results of a validation field test of the structure.