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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Local Fracture-induced Phenomena In Steel Moment Frames
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Local Fracture-induced Phenomena In Steel Moment Frames

机译：钢制弯矩框架中的局部断裂诱发现象

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摘要

Brittle fractures were observed at the welded beam-to-column connections of a number of steel moment frame buildings following the M6.7 1994 Northridge earthquake. Such fractures cause a rapid loss of connection strength and stiffness, as well as a sudden release of the strain energy stored by the connection at the time of fracture. Immediately following the fracture, a number of highly transient phenomena occur locally in the members adjacent to the connection, as well as globally in the structure as a whole. Four significant local phenomena were observed locally during shaking table tests of a one-third scale, two-story, one-bay steel moment frame in which quasi-brittle beam-to-column fractures occurred: (a) change in beam deflected shape; (b) change in moment distribution in adjacent members; (c) generation and propagation of elastic waves; and (d) initiation of dynamic modal response at the member level. Owing to the highly transient nature of these phenomena, they were observed to have second-order effects on overall behavior of the system. In comparison, the reductions in local strength and stiffness caused by the fractures had much more significant effects on system behavior.
机译：1994年北里脊M6.7地震后，在许多钢制矩型框架结构的梁柱连接处的焊接处均发现了脆性断裂。这样的断裂导致连接强度和刚度的快速损失，以及在断裂时由连接存储的应变能的突然释放。断裂后，立即在连接附近的构件中局部以及在整个结构中整体发生许多高度瞬态现象。在三分之一规模，两层，一托架的钢制框架振动台试验中，在本地观察到四个明显的局部现象，其中发生了准脆性梁至柱的断裂：（a）梁偏转形状的变化； （b）改变相邻构件的力矩分布； （c）弹性波的产生和传播； （d）在成员级别启动动态模态响应。由于这些现象的高度瞬态性质，观察到它们对系统的整体行为具有二阶影响。相比之下，由裂缝引起的局部强度和刚度的降低对系统行为的影响要大得多。

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