估算钢制货架系统上托盘滑动位移的可编码方法

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL
Dimitrios Tsarpalis, Dimitrios Vamvatsikos
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引用次数: 0

摘要

为了促进现代仓库内的物流过程,钢货架系统的内容物没有机械地连接到支撑梁上,允许在超过静摩擦时发展内容物滑动机制。鉴于大量内容占主导地位,这有利于限制明显的惯性。另一方面,在强烈的地震激励下,托盘可能会脱落,这是一种失效模式,目前的机架抗震设计过程和指南没有解决这一问题。沿着这些思路,提出了一种可编纂的方法,用于估计钢货架系统的滑动位移,该方法基于对大量响应历史分析的统计解释,使用不同的机架结构和地面运动。首先,使用简化的机架模型进行多参数分析,以(i)选择最能描述托盘滑动问题的强度测量和工程需求参数,(ii)确定主导滑动行为的机架显著特征。此后,使用180个具有不同特征组合的机架实现进行一系列多条纹分析,通过以下三步程序推导出所谓的经验滑动预测方程(ESPE):(a)对最大滑动进行回归,(b)对归一化滑动剖面进行回归,(c)结合步骤a-b推导出给定置信水平下的非归一化剖面。提出的经验关系,然后通过在三个机架案例研究中观察到的和拟合的滑动位移之间的比较来验证。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A codifiable methodology for estimating pallet sliding displacements on steel racking systems

A codifiable methodology for estimating pallet sliding displacements on steel racking systems

To facilitate the logistic processes within a modern warehouse, the contents of steel racking systems are not mechanically connected to the supporting beams, allowing a content-sliding mechanism to develop when static friction is exceeded. Given that the mass of contents is dominant, this is beneficial for limiting the apparent inertia. On the other hand, pallet fall-off may occur during strong seismic excitations, which is a failure mode that is not addressed by current seismic design processes and guidelines for racks. Along these lines, a codifiable methodology is proposed for estimating sliding displacements on steel racking systems, based on the statistical interpretation of a large set of response history analyses, using different rack configurations and ground motions. Firstly, a multi-parametric analysis is conducted using simplified rack models to (i) select the intensity measure and engineering demand parameter that can best describe the problem of pallet sliding and (ii) identify the salient rack characteristics that dominate sliding behavior. Thereafter, a series of multi-stripe analyses are performed using 180 rack realizations with different feature combinations to derive a so-called, Empirical Sliding Prediction Equation (ESPE) by following a three-step procedure: (a) perform regression on maximum sliding, (b) perform regression on the normalized sliding profile, and (c) combine steps a-b to derive the denormalized profile at a given confidence level. The proposed empirical relationships are then validated through a comparison between the observed and fitted sliding displacements in three rack case studies.

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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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