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在负弯矩区,连续组合梁将达到由腹板刚度以及混凝土板和剪力连接刚度所产生的侧扭屈曲的极限状态。这3种刚度构成了组合梁的转动刚度。EC4在平面钢腹板组合梁中定义了这种刚度,但对于波形钢腹板组合梁结构中的刚度尚未有结论性研究。文中提出了一个公式,并基于以下几点来对波形腹板型材组合梁的转动刚度进行评估:1)倒U框架模型的4种代表性的试验结果;2)使用ANSYS有限元软件对数值模型进行构建和标定;3)68个数值模型的计算过程。在这些模型中,研究人员试图改变影响转动刚度的所有参数,例如腹板高度和厚度、平板的大小与类型(混凝土板或组合板)、横截面的剪力连接件的数量以及连接件的纵向间距。
In the negative bending moment zone, the continuous composite beam will reach the limit state of lateral buckling due to web stiffness and the stiffness of the concrete slab and shear connection. These three kinds of stiffness constitute the rotational stiffness of the composite beam. EC4 defines this stiffness in a flat steel web composite beam, but there is no conclusive study on the stiffness in a corrugated steel web composite beam structure. In this paper, a formula is proposed and the rotational stiffness of the corrugated webs is evaluated based on the following points: 1) 4 representative test results of inverted U-frame model; 2) ANSYS finite element software for numerical model Construction and calibration; 3) 68 numerical model of the calculation process. In these models, the researchers attempted to change all the parameters that affect the stiffness of the rotation, such as the web height and thickness, the size and type of slab (concrete slab or composite board), the number of cross-sectional shear connectors and the longitudinal spacing.