【摘要】 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。更多还原

【Abstract】 Buckling-restrained braces(BRBs) have been widely used in structures in seismic-prone areas as structural control members. Stability of BRB end connection is of crucial importance in the design framework of BRB damper. However, the effect of interaction between BRB and frame structures on the performance of BRB end connections has seldom been discussed. To this end, subassemblage test was conducted on one full-scale BRB specimen to investigate the in-plane flexural behavior of BRB end connections with fix-ended condition. It is found that the relative rotation between axial force and brace end would introduce end bending moment at the end of BRB connections. Its magnitude is comparable with the story drift angle. The flexural stress of BRB end connection is larger than 100 MPa even though the cross-sectional area of connection is five times that of the core yielding segment. It shows that the effect of in-plane bending moment induced by frame action on the stability of BRB connections cannot be neglected. Several design implications and future research needs for the stability design of BRB end connections are provided based on the test observation.更多还原