NUMERICAL STUDY ON SHEAR PANEL BEHAVIOR OF PANEL ZONE IN WEB-CLAMPED TYPE CONNECTION
NUMERICAL STUDY ON SHEAR PANEL BEHAVIOR OF PANEL ZONE IN WEB-CLAMPED TYPE CONNECTION
复制标题
腹板夹紧式连接面板区剪力面板行为数值研究
DOI：
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发表时间：
2016
期刊：
影响因子：
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通讯作者：
J. Iyama
中科院分区：
文献类型：
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作者：
K. Araki;J. Iyama
腹板夹持式连接是一种新型连接，它具有与传统焊接连接相当的刚度和与传统高强度螺栓连接相当的工作性能。在这种连接中，预制附件直接连接到柱腹板，柱翼缘上开有两个狭缝。这种连接方式使梁的受力直接传递到柱的腹板上.腹板夹持型节点的两个主要特点是：1）腹板区域没有水平加劲肋; 2）腹板夹持型节点中梁腹板与柱之间不需要通过剪力板连接。在这种连接中，连接件夹紧板区域的一部分，这可以将力从梁腹板直接传递到柱腹板。由于这种独特的细节，如在以前的数值研究中所示，附件可以传递剪切力和弯矩从梁，这导致剪切板的省略。由于腹板夹持连接中板区的这两个特点，腹板夹持连接中板区的边界条件与常规焊接连接中板区的边界条件不同，从而可能导致板区的不同行为。为了研究腹板夹持式节点的节点区是否与传统焊接节点一样，在弹性范围内既表现出受剪节点区的受力性能，又表现出非弹性范围内的桁架节点区的受力性能，本文进行了参数化数值模拟，并对节点区的强度、刚度和应力分布进行了比较。结果，当通过腹板夹紧模型和常规焊接模型之间的面板区域的剪切变形角来比较面板区域的强度和刚度时，观察到腹板夹紧型模型的面板区域的强度和刚度比常规焊接型模型的面板区域的强度和刚度高1.1倍。当比较剪应力分布时，传统焊接节点的剪应力分布比较均匀，而腹板夹持节点的剪应力分布不均匀，且集中在节点中心。这可能意味着腹板夹紧型连接的板区除了剪力板行为外，还有另一种剪力传递机制。当比较大剪切变形角下板区的变形形态时，所有模型均表现为斜向板剪切屈曲和斜向拉应力场。这可能意味着腹板固支连接节点的板区在屈服后，其内力传递机制转变为桁架行为，这与常规焊接连接节点的内力传递机制相同。特别是在没有剪切板的腹板夹紧型模型中，观察到板区垂直侧的挠度，这可能导致板区的早期强度劣化。
The web-clamped type connection is proposed as a new connection which has stiffness comparable to conventional welded connections and high workability comparable to conventional high strength bolted connections. In this connection, the prefabricated attachments are connected to the column web directly, two slits are opened on the column flange. This connection detail makes the force from beam transfer to the column web directly. Two main features of web-clamped type connection which may cause the unique panel zone behavior are: 1) there is no horizontal stiffener in the panel zone, and 2) it is not necessary to connect the beam web and the column by the shear plate in the web-clamped type connection. In this connection, the attachment clamps a part of the panel zone, which can transfer the force from beam to column web directly. Owing to this unique detail, as shown in previous numerical studies, the attachments can transfer both shear force and bending moment from beam, which leads to an omission of the shear plate. Because of this two features of the panel zone in the web-clamped connection, the boundary condition of the panel zone in the web clamped type is different from that of the conventional welded one, which might cause different panel zone behavior. In this paper, in order to investigate whether the panel zone of the web-clamped type connection show both a shear panel behavior in the elastic range and a truss behavior in the inelastic range, which is the same as that of the conventional welded connection, parametric numerical simulations are conducted and the strength, the stiffness and the stress distribution of the panel zone are compared. As a result, when the strength and the stiffness of the panel zone was compared through the shear deformation angle of the panel zone between web-clamped models and conventional welded models, it was observed that the strength and stiffness of the panel zone of the web-clamped type models were 1.1 times higher than those of the conventional welded type models. When the shear stress distribution was compared, the shear stress acting over the panel zone in the conventional welded connection was uniform, while that of the web-clamped connection was not uniform and high at the center of the panel zone. This might imply that the panel zone of the web-clamped type connection has another shear force transmission mechanism in addition to the shear panel behavior. When deformation shape of the panel zone in the large panel shear deformation angle was compared, all the models showed the diagonal panel shear buckling and the diagonal tension field. This may imply that the internal force transfer mechanism of the panel zone of web-clamped connection switches to truss behavior after the panel zone yields, which is the same behavior as that of the conventional welded connection. Especially in the web-clamped type models without the shear plate, deflection in the vertical side of the panel zone was observed, which may cause the early strength deterioration of the panel zone.