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Assessment of seismic damage of thin and lightly reinforced concrete walls using fractal dimension of cracking

机译：利用裂缝的分形维数评估轻薄混凝土薄壁的地震破坏

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摘要

Length, maximum width, and residual width of cracks are key indicators of structural damage. However, pattern and propagation of cracks on the affected structural component should be also considered. In addition, damage evaluation based on visual inspection is a subjective and capricious procedure because the damage assessment relies on the expertise and judgment of the inspector engineer. In order to assess a rapid and reliable evaluation approach of seismic damage, pattern and propagation of cracks observed in thin and lightly reinforced concrete walls for low-rise housing subjected to seismic demands are evaluated in this study by means of fractal dimension of cracking pattern. The proposed parameters are based on the results of an experimental program that comprised 39 low-rise RC wall specimens having typical variables of this type of housing, such as low compressive strengths of concrete, thin walls, low axial loads, low reinforcement ratios, and web shear reinforcement made of deformed bars and welded-wire meshes. A statistical analysis is carried out for computing values of fractal dimension associated to cracking patterns at key damage conditions. Recommendations of this study can help the inspector in estimating the current limit state or performance level of the wall and the story-drift ratio experienced by the wall during shaking. Copyright (c) 2016 John Wiley & Sons, Ltd.
机译：裂纹的长度，最大宽度和剩余宽度是结构损坏的关键指标。但是，还应考虑在受影响的结构部件上产生裂纹的方式和传播。此外，基于外观检查的损坏评估是一种主观的反复无常的程序，因为损坏评估取决于检查员工程师的专业知识和判断力。为了评估一种快速，可靠的地震破坏评估方法，本研究通过裂缝模式的分形维数评估了薄壁和轻型钢筋混凝土薄壁房屋的薄壁和裂缝的扩展情况。提出的参数基于一个实验程序的结果，该程序包括39个具有此类房屋典型变量的低层RC墙样本，例如混凝土的低抗压强度，薄壁，低轴向载荷，低配筋率和腹板剪切钢筋，由变形钢筋和电焊网制成。进行统计分析以计算与关键破坏条件下的裂纹模式相关的分形维数值。这项研究的建议可以帮助检查员估计墙的当前极限状态或性能水平，以及墙在摇动过程中经历的故事-漂移比。版权所有（c）2016 John Wiley＆Sons，Ltd.

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