Dynamic load allowance (DLA) is a key factor for evaluating the structural condition of bridges; however, insufficient research has been performed regarding the characteristics of DLA in concrete-filled steel tube (CFST) arch bridges. To address this issue, based on an actual CFST arch bridge, the DLA characteristics of bridges are investigated numerically in this study. First, aiming at different structural components, such as the arch rib, main girder, and suspenders, the DLA values obtained at various locations of different structural components are compared in detail, and then the changing regulations of the DLA, considering the influence of different vehicle speeds and various extents of pavement roughness, are summarized and analyzed. Additionally, the relationship between the different DLAs obtained by using the different response indices, that is, displacement, bending moment, and axis force of structure, is investigated. Finally, some conclusions that are significantly beneficial for evaluating or detecting the condition of CFST arch bridges are drawn.

中文翻译：

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车辆行驶时钢管混凝土拱桥动载允许量特性的数值研究

动载允许量（DLA）是评估桥梁结构状况的关键因素。但是，关于钢管混凝土（CFST）拱桥中的DLA特性，尚未进行足够的研究。为了解决这个问题，在实际的CFST拱桥的基础上，本研究对桥梁的DLA特性进行了数值研究。首先针对不同的结构部件，例如拱肋，主梁和吊杆，详细比较在不同结构部件的不同位置获得的DLA值，然后考虑不同因素的影响，改变DLA的规定总结并分析了车速和各种程度的路面粗糙度。此外，通过使用不同的响应指数获得的不同DLA之间的关系，即研究结构的位移，弯矩和轴力。最后，得出了一些对评估或检测CFST拱桥状况非常有益的结论。