Numerical and experimental assessment of thermal stresses in steel box girders
Numerical and experimental assessment of thermal stresses in steel box girders
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发表时间：
2009
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通讯作者：
H. Backer;A. Outtier;P. Bogaert
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作者：
H. Backer;A. Outtier;P. Bogaert
热载荷对大型结构的行为具有根本性影响。这种类型的载荷通常以甲板平均温度和热垂直梯度为特征。对于钢箱梁，有关这些参数的现有知识非常有限。因此，钢箱梁热梯度的量化变得非常重要。在此背景下，比利时维尔福德高架桥正在进行长期测量。其定向方式使得甲板板和腹板都直接受到太阳辐射。将测量数据与钢箱梁详细有限元模型（包括加强筋、隔板和磨损层）的结果进行比较。对该系统内的所有热通量（包括太阳辐射、环境辐射、相互辐射、对流气流）进行建模，可以验证钢箱在 24 小时周期以及更长时间内的温度变化。
Thermal loading has a fundamental influence on the behaviour of large structures. This type of loading is generally characterized by the deck average temperature and the thermal vertical gradient. The available knowledge concerning these parameters is quite limited, when it comes to steel box girders. Hence, the quantification of the thermal gradients working on steel box girders becomes quite important. In this context, long term measurements are being undertaken on the Vilvoorde Viaduct in Belgium. This is oriented in such a way that both deck plate and web are directly subjected to solar radiation. The measurement data are compared with results from detailed finite element models of the steel box girders, including stiffeners, diaphragms and wearing courses. Modelling all thermal fluxes within this system, including solar radiation, radiation with the environment, mutual radiation, convective airflow, allows verification of the temperature variations in the steel box during a 24-hour cycle as well as during a longer period.