蜂窝式可替换塑性铰框架试件抗震性能

Seismic Behavior of Honeycomb Frame with Replaceable Plastic Hinge Joints

为避免在地震作用下梁柱翼缘相交处的焊缝发生脆性破坏,本文设计了一种蜂窝式可替换塑性铰梁柱节点,并对基于此节点的4个不同蜂窝式耗能环尺寸的框架试件模型进行低周往复加载的ABAQUS有限元模拟和加载试验,分析各框架试件有限元模型和试验试件的滞回曲线、骨架曲线、刚度退化曲线、延性性能等,研究蜂窝式耗能环的法向厚度和径向厚度对节点框架滞回性能的影响。结果表明:蜂窝式可替换塑性铰节点框架的滞回曲线较为饱满,具有良好的耗能能力;等间距地增加蜂窝式耗能环阵列的径向厚度,可以提高蜂窝式梁柱节点框架的耗能能力和屈服后的变形能力;蜂窝式耗能环阵列法向厚度从H型钢梁腹板厚度增加到3倍H型钢梁腹板厚度时,蜂窝式梁柱框架试件的耗能能力显著提高。蜂窝式梁柱框架试件试验中蜂窝式耗能单元的破坏位置与蜂窝式梁柱框架试件有限元模型中应力分布较大的位置几乎完全吻合,符合实际情况。相较于传统钢结构梁柱抗震节点,蜂窝式可替换塑性铰梁柱节点将梁柱焊缝处的脆性破坏转化为梁上特定位置的破坏,充分转移梁柱节点焊缝处的应力,蜂窝式可替换塑性铰节点保护了梁柱节点焊缝,能够有效实现塑性铰外移。蜂窝式可替换塑性铰节点有效减少梁柱节点焊缝开裂现象,降低钢结构在大震下发生焊缝开裂而倒塌的几率,易于模块化工厂加工,显著提高施工效率,便于消防管道、电缆等设施的转向和穿线。

To avoid the brittle failure of welds at the intersection of the beam and column flanges under the action of earthquakes,a honeycomb replaceable plastic hinged beam-column joint was designed.The ABAQUS finite element simulations of low-cycle reciprocating loading and lowcycle reciprocating loading test were carried out on four frame specimen models of different honeycomb energy dissipation ring sizes based on this node.The finite element model of each frame specimen and the hysteresis curve,skeleton curve,stiffness degradation curve,ductility performance of each frame specimen were fully analyzed,and the normal thickness and radial thickness of the honeycomb energy dissipation ring were discussed.The results showed that the hysteretic curve of the honeycomb replaceable plastic hinge node frame was relatively full and had a good energy consumption capacity.Increasing the radial thickness of the honeycomb energy-consuming ring array in equal intervals could improve the energy consumption capacity and deformation ability of the honeycomb beam-column node frame after yield;When the normal thickness of the honeycomb energy-consuming ring array was increased from the thickness of the H-type steel beam web to 3 times the thickness of the H-type steel beam web,the energy consumption capacity of the honeycomb beam and column frame specimen was significantly improved.The failure position of the honeycomb energy-consuming unit in the honeycomb beam and column frame specimen test was almost completely consistent with the position with large stress distribution in the finite element model of the honeycomb beam and column frame specimen,which was in line with the actual situation.Compared with the seismic node of the traditional steel structure beam and column,the honeycomb replaceable plastic hinge beam and column node converted the brittle damage at the beam and column weld into the damage at a specific location on the beam,fully transferring the stress at the beam and column node weld,and the honeycomb replaceable plastic hinge node protects the beam and column node weld,which could effectively realize the plastic hinge outward transfer.The honeycomb replaceable plastic hinge beam and column node can effectively reduce the weld cracking phenomenon of the beam and column nodes,reduce the probability of weld cracking and collapse of steel structures under large earthquakes,easy modular factory processing,significantly improve construction efficiency,and facilitate the steering and threading of fire pipes,cables and other facilities.