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防屈曲支撑作为一种有效的耗能减震构件在地震高烈度区的工程结构中已被广泛应用。保证防屈曲支撑节点的稳定性是其设计的关键,然而已有研究和设计方法并没有关注支撑-结构之间的相互作用对防屈曲支撑节点稳定性的影响。为此,设计一根两端固接连接的足尺防屈曲支撑试件并对其进行子系统试验,支撑采用单斜布置形式。试验结果表明,结构层间变形会引起支撑节点以及约束构件发生平面内刚体转动,导致支撑轴力作用线与节点轴线之间产生相对转角,其幅值与层间变形角相当,是导致节点弯矩产生的根源。在支撑节点截面面积为屈服段面积5倍和层间变形角为3.5%的情况下,节点根部弯曲正应力已超过100MPa,其不利影响不容忽视。最后,根据试验结果给出若干关于防屈曲支撑节点稳定性设计及研究的建议。
As an effective energy-dissipative shock-absorbing member, buckling brace has been widely used in the engineering structure of high seismic intensity area. However, the existing research and design methods do not pay attention to the influence of the support-structure interaction on the stability of the buckling brace. For this purpose, a full-scale buckling-supported specimen with both ends fixedly connected is designed and the subsystem test is carried out. The support adopts a single-oblique arrangement. The experimental results show that the deformation of the structure layer causes the rigid rotation of the support node and the restraint member in plane, resulting in the relative rotation angle between the action axis of the support axial force and the node axis. The amplitude of the deformation is equivalent to the deformation angle of the interlayer, The origin of the moment. Under the condition that the cross-sectional area of the supporting node is 5 times of the yielding area and 3.5% of the deformation angle of the interlayer, the normal stress at the root of the node has exceeded 100 MPa, and its adverse effect can not be ignored. Finally, some suggestions on the stability design and research of buckling-supported joints are given based on the experimental results.