考虑组合效应的梁腹板开圆孔型节点抗震性能试验研究

Experimental study on seismic behavior of connections with opening on beam web considering the composite effect

为考察楼板组合效应对腹板开圆孔节点滞回性能、破坏机理、塑性铰形成位置的影响,设计并完成考虑组合效应的梁腹板板开圆孔型节点足尺试件的拟静力试验。通过试验现象,阐述试验试件破坏全过程,揭示该类节点的破坏机理。基于ANSYS分析平台,建立试验试件的有限元模型,数值模拟结果与试验结果的对比验证了有限元分析方法的合理性。结合以往试验获得数据,建立考虑组合效应开圆孔、不考虑组合效应开圆孔、不考虑组合效应不开圆孔等3种节点对比模型,讨论楼板组合效应对节点破坏形式、滞回性能、塑性区分布的影响。研究结果表明,组合效应对腹板开圆孔节点的性能影响不可忽略;选择合理的削弱参数,梁腹板开圆孔型节点可以达到塑性铰外移的效果。

To investigate the influence of composite effect of floor labs on the hysteretic behavior, failure mechanism and plastic hinge location of the connections with opening on beam web （OBW）, the pseudo-static test of full-scale specimens of OBW connection including floor slab was carried out. From the experimental results, the failure process and the failure mechanism of 0BW connections considering composite effect are illustrated. Based on ANSYS software, the numerical analysis model of 0BW connection including floor slab is established. The analysis results agree well with the experimental ones, which verifies the validity of the numerical model. On the basis of experimental data, three kinds of numerical analysis models are established, including the OBW connections with floor slab, OBW without floor slab and the connection without OBW and floor slab. The composite effects on the perfornaance of the OBW connections are discussed, such as hysteretic behavior, failure mode and plastic zone distribution. The research results show that the influence of composite effect on the OBW connection can not be ignored. It is also found that plastic hinge of OBW connection including floor slabs could move to the weakened areas and be away from the end of the beam when weakening parameters are properly selected.