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首页> 外文期刊>Bulletin of Earthquake Engineering >On the low-cycle fatigue capacity of unanchored steel liquid storage tank shell-to-base connections
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On the low-cycle fatigue capacity of unanchored steel liquid storage tank shell-to-base connections

机译：非锚固钢制储罐罐壳-基础连接的低周疲劳能力

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Under strong earthquake motions, the liquid stored within large unanchored steel tanks can cause rocking and uplift of the tank base from the supporting foundation. Repeated rocking can lead to low-cycle fatigue fractures in the tank base-plate, and ultimately spillage of tank contents. Due to limited research on tank connection capacity, current European and New Zealand tank standards (EuroCode8 part 4 and NZSEE) impose unjustified rotation limits on tank shell-to-base connections (current limit being 0.2 rad). These rotation limits often govern the design of new tanks, and many existing tanks require retrofit to meet compliance. This paper experimentally investigates the fatigue capacity of tank shell-to-base connections, with a focus on the effects from material ductility and applied strain range (rotation range). Twenty-seven tank connections representing two steel material grades are fatigue tested under constant range rotation cycles to generate fatigue-life curves. Tensile loads applied to the base-plate simulate membrane action present in tanks during uplift. Results indicate that the strain capacity of the base-plate base material strongly influences connection fatigue capacity as fatigue fractures originate in the base material away from the weld toe and weld heat affected zone. Increasing base-plate ductility drastically increases connection fatigue life. All connection specimens sustained multiple uplift cycles at rotations greater than the existing EuroCode8 and NZSEE limits.
机译：在强烈的地震作用下，大型未锚固钢制储罐中存储的液体会引起储罐基座从支撑基础上晃动和隆起。反复晃动会导致储罐底板的低周疲劳断裂，并最终导致储罐内容物溢出。由于对储罐连接能力的研究有限，当前的欧洲和新西兰储罐标准（EuroCode8第4部分和NZSEE）对储罐壳底连接施加了不合理的旋转限制（电流限制为0.2 rad）。这些旋转限制通常控制着新储罐的设计，许多现有储罐需要进行翻新以符合法规要求。本文通过实验研究了罐壳与底座之间的连接的疲劳能力，重点研究了材料延展性和所施加应变范围（旋转范围）的影响。代表两种钢材等级的27个储罐连接件在恒定范围的旋转循环下进行了疲劳测试，以生成疲劳寿命曲线。施加在基板上的拉伸载荷模拟了提升过程中储罐中的膜作用。结果表明，基板疲劳强度极大地影响了连接疲劳能力，因为疲劳断裂起源于远离焊趾和焊缝热影响区的基板材料。基板延展性的提高大大延长了连接疲劳寿命。所有连接样本在大于现有的EuroCode8和NZSEE极限的旋转下承受了多次提升循环。

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