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框筒结构因能够利用结构的整个宽度抵抗侧向荷载引起的倾覆弯矩在高层建筑中得到了广泛的采用。按照三维空间框架结构对框筒结构进行非线性分析需要很大的计算量。将结构作为整体考虑能够减少计算量,但由于梁柱构件的柔性,结构中出现的剪力滞效应使得分析变得复杂。该文通过采用等效连续化方法得到的剪力滞系数,在Timoshenko梁理论及多垂直杆单元模型的基础上,提出一个框筒结构简化非线性单元模型。该模型能够考虑腹板和翼缘板的剪力滞效应,计算量大为减少,可用在初步设计对框筒结构的非线性性能进行快速的评估。
Frame tube structures are widely used in high-rise buildings because of their ability to utilize the full width of the structure to resist overturning moments caused by lateral loads. Non-linear analysis of the frame tube structure according to the three-dimensional space frame structure requires a large amount of calculation. Considering the structure as a whole can reduce the computational load, but due to the flexibility of the beam-column member, the shear lag effect in the structure makes the analysis complicated. Based on the theory of Timoshenko beam and the model of multi-vertical bar element, a simplified nonlinear element model of frame-tube structure is proposed by using the shear lag coefficient obtained by the equivalent continuum method. The model can take into account the shear lag effect of webs and flanges and greatly reduce the computational load. It can be used in the preliminary design to quickly evaluate the nonlinear performance of the frame structure.