腹板开洞连续组合梁内力重分布影响参数分析

PARAMETRIC ANALYSIS OF INTERNAL FORCE REDISTRIBUTION OF CONTINUOUS COMPOSITE BEAMS WITH WEB OPENINGS

为研究腹板开洞连续组合梁的内力重分布性能,对6根组合梁试件进行试验研究,研究参数为混凝土板厚和配筋率;对7根组合梁进行有限元计算,研究参数为洞口尺寸和洞口位置。结果表明:开洞组合梁不仅在塑性状态下会发生弯矩重分布,而且还存在洞口引起的"弯矩重分布"。混凝土板厚度增加可以减少组合梁弯矩调幅,配筋率增加能提高组合梁的弯矩调幅。随着洞口宽度和高度的增加,组合梁的弯矩调幅增大。另外发现,洞口位置对组合梁承载力和内力重分布有显著的影响。

In order to investigate the internal force redistribution of continuous composite beams with web openings,five continuous beams with web openings and a contrasting continuous beam without web openings were tested under the static loads,the main parameters were the concrete slab thickness and reinforcement ratio. Meanwhile,seven beams with web openings were simulated using the finite element program ANSYS,the main parameters were the opening size and the location of web openings. The results showed that there were not only moment redistribution in the plastic stage of the beam,but also redistribution caused by the openings. With the increase of slab thickness,the moment modulation of beams was decreased. On the contrary,with the increase of reinforcement ratio,the moment modulation of beams was increased. With the increase of the width and height of the opening,the moment modulation of composite beams was increased,accordingly. In addition,the results also indicated that the location of openings had a significant impact on the bearing capacity and moment redistribution of continuous composite beams.