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首页> 外文期刊>Bulletin of earthquake engineering >Self-similar interstory drift spectrum and response distribution of flexural-shear beam with nonuniform lateral stiffness
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Self-similar interstory drift spectrum and response distribution of flexural-shear beam with nonuniform lateral stiffness

机译：非均匀横向刚度弯曲剪切梁的自相似型惰性漂移谱和响应分布

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摘要

This paper proposes the concept of self-similar interstory drift spectrum based on the dimensional analysis of flexural-shear beam with nonuniform lateral stiffness, and scrutinizes the effects of lateral stiffness reduction on the seismic responses and response distribution. Firstly, the finite element formulation for the combined beam is established, which is convenient for parametric analysis. Subsequently, the intrinsic length scale and time scale are proposed to conduct correctly the dimensional analysis for seismic responses of flexural-shear beam, indicating that the normalized maximum interstory drift ratio and normalized maximum floor acceleration present a complete similarity in the normalized building height and the beauty of order. Hence, the concept of self-similar interstory drift spectrum is suggested to avoid the use of empirical relationship between fundamental period and building height. Moreover, the effects of lateral stiffness reduction on the normalized responses and response distribution of flexural-shear beam are examined under the idealized pulses and near-fault ground motions. With the exception of significant stiffness reduction, the effect of lateral stiffness reduction is generally small. In particular, the vertical distribution of interstory drift mainly depends on the structural type, whereas the floor acceleration generally increases along the building height. Finally, the established regression model can sufficiently fit the mean self-similar interstory drift spectrum and mean self-similar floor acceleration spectrum, and the normalized seismic responses can be well predicted by the fitted curves.
机译：本文提出了基于具有非均匀横向刚度的弯曲剪切梁的尺寸分析的自相似型惰性漂移谱的概念，并仔细审查了横向刚度降低对地震反应和反应分布的影响。首先，建立了组合光束的有限元配方，这对于参数分析方便。随后，提出了内在长度和时间尺度来正确地进行弯曲剪切梁的地震响应的尺寸分析，表明归一化的最大壁漂移比和归一化的最大楼层加速度在归一化建筑物高度中存在完整的相似性。订单之美。因此，建议避免基本时期与建筑物高度之间的经验关系的概念。此外，在理想脉冲和近断层地运动下检查了横向刚度降低对弯曲剪切梁的归一化反应和响应分布的影响。除了显着的刚度降低之外，横向刚度降低的效果通常很小。特别地，惰性漂移的垂直分布主要取决于结构类型，而楼层加速度通常沿建筑物高度增加。最后，建立的回归模型可以充分符合平均自相似的惰性漂移谱和平均自类似地板加速谱，并且可以通过安装的曲线预测归一化的地震反应。

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