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A simple model for the post-breakage response of laminated glass under in-plane loading

机译：平面载荷作用下夹层玻璃断裂后响应的简单模型

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摘要

Laminated glass, composed by glass plies bonded by polymeric interlayers, is used for structural purposes thanks to its safe post-glass-breakage response. When glass breaks, the shards remain attached to the interlayer, imparting to the damaged element a residual load-bearing capacity, influenced by the tension stiffening of the polymer through the adhesion with the glass shards and, hence, by the degree of delamination. The progression of delamination under cyclic loading has been studied numerically, by assuming a non-linear stress vs. separation law for the glass/interlayer interface. Using a micro-macro approach and homogenization techniques, energy theorems in linear elasticity provide a simple formula that furnishes a lower bound for the effective stiffness of heat-treated panels under in-plane loading, in particular under shear. Numerical experiments have been performed by considering glass shards with different sizes (varying from 20 mm to 100 mm) and shapes (square, rhombic and irregular quadrilateral), with amount of delamination ranging between 30% and 90%, with different shapes of the bonded zone (circular, square and rhombic with rounded corners). The results show that the proposed formula provides a good approximation of the effective stiffness, always on the safe side, with mean error of 6%. This study is of importance in view of the development of innovative glass-based bracings for the strengthening of buildings especially with respect to seismic events.
机译：夹层玻璃由玻璃夹层与聚合物中间层粘合而成，由于其安全的玻璃破裂后响应，可用于结构用途。当玻璃破裂时，碎片仍保持附着在中间层上，从而赋予受损元件残余的承压能力，这受聚合物通过与玻璃碎片的粘附而引起的拉伸刚度以及因此受到分层程度的影响。通过假设玻璃/中间层界面的非线性应力与分离定律，对循环载荷下的分层过程进行了数值研究。使用微宏观方法和均质技术，线性弹性的能量定理提供了一个简单的公式，为平面内载荷下（尤其是在剪切力下）的热处理板的有效刚度提供了下限。通过考虑不同尺寸（从20毫米到100毫米不等）和形状（正方形，菱形和不规则四边形）的玻璃碎片（分层量在30％到90％之间）以及不同形状的粘合玻璃碎片进行了数值实验区域（圆形，正方形和带有圆角的菱形）。结果表明，所提出的公式可以很好地逼近有效刚度，始终在安全方面，平均误差为6％。考虑到创新的玻璃支撑物的发展对加强建筑物特别是地震事件的重要性，这项研究具有重要意义。

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  • 来源
    《Composite Structures》 |2019年第12期|111426.1-111426.13|共13页
  • 作者

  • 作者单位

    Univ Parma Dept Engn & Architecture Parco Area Sci 181-A I-43124 Parma Italy;

    Univ Parma Dept Engn & Architecture Parco Area Sci 181-A I-43124 Parma Italy|Italian Natl Res Council ITC CNR Construct Technol Inst Via Lombardia 49 I-20098 Milan Italy;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Laminated glass; Post-glass-breakage response; In-plane loading; Effective stiffness; Tension stiffening;

    机译：夹层玻璃玻璃破裂后的反应;面内加载;有效刚度;拉伸刚度;

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