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Effectiveness of superelastic bars for seismic rehabilitation of clay-unit masonry walls

机译:超弹性钢筋在粘土单元砌体墙地震恢复中的有效性

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This paper presents the results on shaking table tests of half-scale brick walls performed to investigate the effectiveness of newly developed Cu-Al-Mn superelastic alloy (SEA) bars in retrofitting of historical masonry constructions. Problems associated with conventional steel reinforcing bars lie in degradation of stiffness and strength, or pinching phenomena, under cyclic loading, and presence of large residual cracks in structures during and after intense earthquakes. This paper attempts to resolve the problems by applying newly developed Cu-Al-Mn SEA bars, characterized by large recovery strain, low material cost, and high machinability, as partial replacements for steel bars. Sets of unreinforced, steel reinforced, and SEA-reinforced specimens are subjected to scaled earthquake excitations in out-of-plane direction. Whereas steel-reinforced specimens showed large residual inclinations, SEA-reinforced specimens resulted in stable rocking response with slight residual inclinations. Corresponding nonlinear finite element (FE) models are developed to simulate the experimental observations. The FE models are further used to examine the sensitivity of the response with respect to the variations in experimental conditions. Both the experimental and numerical results demonstrate the superiority of Cu-Al-Mn SEA bars to conventional steel reinforcing bars in avoiding pinching phenomena.
机译:本文介绍了半尺寸砖墙振动台试验的结果,以研究新开发的Cu-Al-Mn超弹性合金(SEA)钢筋在改造历史建筑中的有效性。与常规的钢筋相关的问题在于,在周期性载荷下,刚度和强度的降低或夹挤现象,以及在强烈地震期间和之后在结构中存在大的残余裂纹。本文试图通过使用新开发的具有高恢复应变,低材料成本和高可加工性的Cu-Al-Mn SEA棒来解决这些问题,以部分替代钢棒。一组未加强,钢加强和SEA加强的标本在平面外方向上按比例进行地震激励。尽管钢筋加固的样品显示出较大的残余倾斜度,而SEA加固的样品却产生了稳定的摇摆响应,并带有少量的残余倾斜度。建立了相应的非线性有限元(FE)模型来模拟实验观察结果。有限元模型还用于检查响应相对于实验条件变化的敏感性。实验和数值结果均表明,Cu-Al-Mn SEA筋在避免夹挤现象方面优于常规钢筋。

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