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Fracture assessment method for steel structures under seismic conditions: idea of fracture assessment and assessment flow

机译：地震条件下钢结构的断裂评估方法：断裂评估与评估流程的思路

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Damage and fractures of steel structure take a numbernof different forms but it is brittle fracture that has thengreatest social implications and is regarded with fear andna determination that it must not be allowed to happen.nIn Japan, the Japan Welding Society specification WESn2805, established in 1976, represents a method ofnassessing the brittle fracture of welded steel structuresn(the currently valid edition is not the 1997 edition1 andna revised edition is scheduled for publication), whichnhas proved of great utility in the assessment of brittlenfractures in, for example, ships, low-temperature storagentanks, maritime structures and pipelines.nOn the other hand, brittle fractures occurred innstructural steelwork during the South Hyogo [Kobe]nearthquake, in a previously unobserved phenomenon innwhich the steel framework failed in a brittle manner beforenplastic deformation could be completed. The cause ofnthese fractures was described as ‘dynamic cyclic majorndeformation’ and WES 28082 was published in 2003 tonincorporate new criteria that took into account this newnfracture phenomenon, which previously had not beennconsidered at the design stage.
机译：钢结构的损坏和断裂有多种形式，但脆性断裂具有最大的社会意义，并被认为是绝不允许发生的。n日本，日本焊接学会规范WESn2805，成立于1976年表示一种减轻焊接钢结构脆性断裂的方法（目前有效的版本不是1997年版1，并且计划出版修订版），它已被证明在评估船用低脆性断裂中具有很大的实用性。另一方面，在兵库县南部神户地震期间，结构性钢结构发生脆性断裂，这是以前未曾观察到的现象，即在完成塑性变形之前，钢构架以脆性方式破裂。此类断裂的原因被描述为“动态循环主变形”，WES 28082于2003年发布，其中纳入了考虑到这种新的断裂现象的新标准，而以前在设计阶段并未考虑这一现象。

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