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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures. Part Ⅱ. Effects on structural responses
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Numerical study of characteristics of underground blast induced surface ground motion and their effect on above-ground structures. Part Ⅱ. Effects on structural responses

机译：地下爆炸诱发地表运动特征及其对地上结构影响的数值研究。第二部分。对结构响应的影响

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Studies of structural responses and damage to high-frequency blast motion are very limited. Current practice uses some empirical allowable ground vibration limits in assessing structural performance. These empirical limits overlook the physical parameters that govern structural response and damage, such as the ground motion characteristics and inherent structural properties. This paper studies the response of RC frame structures to numerically simulated underground blast-induced ground motions. The structural response and damage characteristics of frame structures to ground motions of different frequencies are investigated first. The effects of blast ground motion spatial variations and soil-structure interaction on structural responses are also studied. A suitable discrete model that gives accurate response prediction is determined. A damage index defined based on the accumulated plastic hinge rotation is used to predict structural damage level. Numerical results indicated that both the low structural vibration modes (global modes) and the first elemental vibration mode (local) might govern the dynamic structural responses depending on the ground motion frequency and structural response parameters under consideration. Both ground motion spatial variations and soil-structure interaction effects are prominent. Neglecting them might yield inaccurate structural response prediction. The overall structural response and damage are highly ground motion frequency dependent. Numerical results of structural damage are also compared with some test results obtained in a previous study and with code specifications. Discussions on the adequacy of the code allowable ground vibration limits on RC frame structures are also made.
机译：对结构响应和对高频爆炸运动的破坏的研究非常有限。当前的实践在评估结构性能时使用了一些经验允许的地面振动极限。这些经验限制忽略了控制结构响应和破坏的物理参数，例如地震动特性和固有的结构特性。本文研究了钢筋混凝土框架结构对数值模拟地下爆炸引起的地面运动的响应。首先研究了框架结构对不同频率地面运动的结构响应和损伤特性。还研究了爆炸地震动空间变化和土-结构相互作用对结构响应的影响。确定给出准确响应预测的合适离散模型。基于累积的塑料铰链旋转定义的损坏指数用于预测结构损坏级别。数值结果表明，低结构振动模式（整体模式）和第一基本振动模式（局部）都可能取决于所考虑的地震动频率和结构响应参数来控制动态结构响应。地面运动的空间变化和土壤-结构相互作用都非常突出。忽略它们可能会导致结构响应预测不准确。整体的结构响应和破坏高度依赖于地面运动频率。还将结构破坏的数值结果与先前研究中获得的一些测试结果以及规范进行了比较。还讨论了规范对RC框架结构的地面允许振动极限的适当性。

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