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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Transient response in steel moment frames caused by brittle connection fracture
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Transient response in steel moment frames caused by brittle connection fracture

机译：脆性连接断裂引起的钢矩框架瞬态响应

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摘要

Brittle fractures occurring at the beam-column connections of welded steel moment frames, such as those observed following the M_w 6.7 1994 Northridge earthquake, result in sudden decreases in connection strength and stiffness. These changes lead to various types of transient dynamic behavior at the local and global levels. The effects on global acceleration include highly transient, high-frequency waveforms that occur immediately following fracture and decay quickly. The theoretical basis for the occurrence of these transient waveforms is examined and their presence in structural analysis results is demonstrated. Results from shaking table experiments on a simple steel moment frame with fracturing connections show that transient accelerations are consistently observed following fracture. These experiments and analyses show that, due to their short duration, the transient acceleration waveforms do not cause any sudden changes in the global lateral displacement response of typical building structures. Therefore, these global acceleration transients have relatively benign effects on overall system behavior despite their relatively large amplitudes.
机译：焊接钢矩框架的梁柱连接处发生的脆性断裂（例如在1994年M_w 6.7级Northridge地震后观察到的断裂）导致连接强度和刚度突然下降。这些变化导致了局部和全局级别的各种类型的瞬态动态行为。对整体加速度的影响包括高瞬态，高频波形，这些波形在断裂后迅速出现并迅速衰减。检查了这些瞬态波形发生的理论基础，并证明了它们在结构分析结果中的存在。在具有断裂连接的简单钢矩框架上进行的振动台实验结果表明，断裂后始终观察到瞬态加速度。这些实验和分析表明，由于持续时间短，瞬态加速度波形不会引起典型建筑结构的整体横向位移响应的任何突然变化。因此，尽管这些全局加速度瞬变具有相对较大的幅度，但它们对整个系统的行为具有相对良性的影响。

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