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Studded bond enhancement for steel-concrete-steel sandwich shells

机译：钢-混凝土-钢夹心壳的螺柱粘结增强

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A double-wall steel-concrete-steel (SCS) composite vault has been proposed for the "Singapore Cone" Arctic offshore structure. The SCS vault performs well under uniform pressure, but can fail prematurely under partial asymmetric loading. These shells will often experience a punching shear failure or flexural steel plate buckling which is exacerbated by the loss of bond between the steel wall and concrete interface. In this study, a construction friendly method using an array of welded mini studs to improve the steel concrete interfacial bond is proposed and studied. Two workable Type I Portland cement grout mixes are tested as the bulk material: plain, and fiber reinforced. Studded concrete steel interfaces were tested under mode I interface peeling, and mixed mode shear. The small scale tests were also modeled with the nonlinear finite element analysis software ABAQUS, and the numerical results were compared against the laboratory experimental results. After qualitatively matching the computational results with experimental results, a large scale SCS prototype is modeled and designed, with working stresses limited to the elastic range. Mode I peeling ultimate strength of 0.46Z was used for the prototype analysis, with mixed mode shearing limited by bulk concrete away from the studded bond surface. (C) 2016 Elsevier Ltd. All rights reserved.
机译：已经为“新加坡锥”北极近海结构提出了一种双壁钢-混凝土-钢（SCS）复合拱顶。 SCS保管库在均匀压力下表现良好，但在部分非对称载荷下可能过早失效。这些壳体经常会发生冲剪剪切破坏或挠曲钢板屈曲，而钢板壁与混凝土界面之间的粘结损失会加剧这种情况。在这项研究中，提出并研究了一种使用焊接微型螺柱阵列改善钢混凝土界面粘结的施工友好方法。两种可行的I型波特兰水泥灌浆混合物均作为散装材料进行了测试：普通材料和纤维增强材料。在I型界面剥离和混合模式剪切下测试了带钉混凝土混凝土界面。还使用非线性有限元分析软件ABAQUS对小规模测试进行了建模，并将数值结果与实验室实验结果进行了比较。在将计算结果与实验结果定性匹配之后，对大型SCS原型进行建模和设计，其工作应力限制在弹性范围内。 I型剥离极限强度为0.46Z用于原型分析，混合模式剪切受散装混凝土远离钉结表面的限制。 （C）2016 Elsevier Ltd.保留所有权利。

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