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Prediction of the additional shear action on frame members due to infills

机译：预测由于填充而对框架构件产生的附加剪切作用

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摘要

Infill masonry walls in framed structures make a significant contribution to the response under seismic actions. With special regard to reinforced concrete (RC) structures, it is known that internal forces modifications caused by the frame-infill interaction may be not supported by the surrounding frame because of the additional shear forces arising at the ends of beams and columns. Such additional forces may lead to the activation of brittle collapse mechanisms and hence their prediction is basic in capacity assessment, especially for structures that disregard the details for seismic zones. In this paper a parametric study is carried out addressed to the prediction of the shear forces mentioned before. The results of this study can be used as a support when the simplified model is adopted consisting in the substitution of infill with an equivalent pin jointed concentric strut, because in this case the structural analysis fails in the prediction of the shear forces in question. Through the paper, in which existing RC infilled frames designed only for vertical loads are discussed, analytical laws, depending on the level of the axial force arising in a concentric strut equivalent to infill, are proposed, the above analytical law allowing to correct the local shear forces in the frame critical sections, which are not predictable in the case of substitution of infill with an equivalent concentric strut.
机译：框架结构中的填充砌体墙对地震作用下的响应做出了重要贡献。特别是对于钢筋混凝土（RC）结构，众所周知，由于在梁和柱的端部产生了额外的剪切力，因此框架与填充物之间的相互作用引起的内力变化可能不受周围框架的支持。这种额外的力可能导致脆性塌陷机制的激活，因此，它们的预测对于容量评估至关重要，特别是对于那些忽略地震带细节的结构。在本文中，进行了参数研究，以预测前面提到的剪切力。当采用简化模型（包括用等效销连接的同心支杆代替填充物）时，此研究的结果可以用作支持，因为在这种情况下，结构分析无法预测所讨论的剪力。通过本文，讨论了仅用于垂直载荷的现有RC填充框架，根据与填充等效的同心支杆中产生的轴向力的大小，提出了分析定律，上述分析定律可以校正局部框架关键部分的剪切力，在用等效的同心支杆代替填料的情况下是无法预料的。

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