装配式梁柱外环板高强螺栓连接节点抗弯承载力研究

RESEARCH ON FLEXURAL CAPACITY OF PREFABRICATED BEAM-COLUMN HIGH-STRENGTH BOLTED JOINT WIEH EXTERNAL DIAPHRAGMS

采用理论分析、数值模拟分析方法,针对装配式梁柱外环板高强螺栓连接节点的构造参数变化对节点抗弯承载力影响开展研究,分别考虑节点外环板厚度、外环板宽度、外环板圆弧半径、外环板长度等参数对节点抗弯承载力的影响。研究结果表明:有限元数值计算结果与试验、理论分析结果较一致;外环板厚度对节点承载力有明显影响,随外环板厚度增加,节点抗弯承载力提高,延性有所降低,建议外环板厚度取值不宜小于梁翼缘厚度,但不应超过梁翼缘厚度2 mm;增加外环板宽度,对柱节点域有一定加强作用,将外环板宽度限定在合理范围有利于提高节点抗弯承载力;外环板长度对节点抗弯承载力影响不明显,建议外环板长度可满足高强螺栓孔距构造要求下限;圆弧半径对节点应力传递有较大影响,建议外环板圆弧半径与外环板宽度比值为4倍左右。

Theoretical analysis and numerical simulation analysis methods was used.A study was conducted on the influence of changes in the structural parameters of the prefabricated beam-column high-strength bolted joint on the flexural capacity of the joint.The influences of parameters such as the thickness of the external diaphragm,the width of the external diaphragm,the arc radius of the external diaphragm and the length of the external diaphragm on the flexural capacity of the joint were studied.The research results show that the numerical calculation results of the finite element have achieved good agreement with the experimental and theoretical analysis results.The flexural capacity of the joint is obviously affected by the thickness of the external diaphragm.As the thickness of the external diaphragm increases,the flexural capacity of the joint increases and the ductility decreases.It is recommended that the thickness of the external diaphragm should not be less than the thickness of the beam flange,but should not exceed the thickness of the beam flange by 2 mm.The width of the external diaphragm is increased,which has a certain strengthening effect on the column joint domain.The width of the external diaphragm is limited to a reasonable range,which is beneficial to improve the flexural capacity of the joint.The flexural capacity of the joint is not significantly affected by the length of the external diaphragm.It is recommended that the length of the external diaphragm can meet the lower limit of the high-strength bolt hole construction requirements.Nodal stress transmission is greatly affected by the arc radius.It is recommended that the ratio of the arc radius to the width of the external diaphragm is about 4 times.