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为研究钢—混凝土组合空腹板架结构负弯矩区力学性能,基于有限元分析软件Abaqus建立两跨半连续空腹板有限元模型,考虑了材料和几何非线性,对模型进行了竖向均布荷载作用下的力学性能研究,重点分析了中间支座负弯矩区钢筋、混凝土板、剪力键以及钢肋的受力特点。研究结果表明:负弯矩区混凝土板受拉开裂,板内分布钢筋主要承受拉力作用,且受力均匀;负弯矩区段的剪力键使混凝土板受到较大的冲切作用,且该范围随着负弯矩的降低而逐渐减弱,因此,在对结构负弯矩区进行设计、分析时应合理考虑混凝土板的有效宽度,并采取有效措施降低剪力键对混凝土板的冲切作用。
In order to study the mechanical properties of the negative moment region of the steel-concrete composite hollow web structure, a finite element model of two-span semi-continuous web was established based on finite element analysis software Abaqus. Considering the material and geometrical nonlinearity, The mechanical properties under load are analyzed, and the stress characteristics of the steel bar, concrete slab, shear bond and steel rib in the negative moment area of the middle bearing are analyzed emphatically. The results show that the concrete slab in negative moment area is subjected to tensile cracking and the distribution of rebar in the slab is mainly subjected to the pulling force and the stress is uniform. The shear bond of the negative bending moment section causes the concrete slab to be punched severely, The range decreases with the decrease of negative bending moment. Therefore, the effective width of concrete slab should be rationally considered in the design and analysis of negative moment area of structure, and the effective measures should be taken to reduce the punching action of shear bond on concrete slab .