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Collapse Of A Nonductile Concrete Frame: Shaking Table Tests

机译：非延性混凝土框架的崩溃：振动台测试

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摘要

Post-earthquake reconnaissance has reported the vulnerability of older reinforced concrete (RC) columns lacking details for ductile response. Research was undertaken to investigate the full-range structural hysteretic behavior of older RC columns. A two-dimensional specimen frame, composed of nonductile and ductile columns to allow for load redistribution, was subjected to a unidirectional base motion on a shaking table until global collapse was observed. The test demonstrates two types of column failure, including flexure-shear and pure flexural failure. Test data are compared with various simplified assessment models commonly used by practicing engineers and researchers to identify older buildings that are at high risk of structural collapse during severe earthquake events. Comparison suggests that ASCE/SEI 41-06 produces very conservative estimates on load-deformation relations of flexure-shear columns, while the recently proposed ASCE/SEI 41-06 update imposes significant modifications on the predictive curve, so that improved accuracy has been achieved.
机译：地震后的侦察报告说，老式钢筋混凝土（RC）柱的脆弱性缺乏延性响应的细节。进行了研究以研究较旧的RC柱的全范围结构滞后行为。由可延展载荷的非延性和延性柱组成的二维试样框架在振动台上经受单向基本运动，直到观察到整体塌陷。该测试演示了两种类型的柱破坏，包括弯曲剪切和纯弯曲破坏。将测试数据与实践工程师和研究人员通常使用的各种简化评估模型进行比较，以识别在严重地震事件中极有可能发生结构倒塌的老式建筑。比较表明，ASCE / SEI 41-06对弯曲剪切力柱的荷载-变形关系产生了非常保守的估计，而最近提出的ASCE / SEI 41-06更新对预测曲线进行了重大修改，从而提高了精度。

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