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首页> 外文期刊>Structural Design of Tall Buildings >Collapse-resistant performance of RC beam-column sub-assemblages with varied section depth and stirrup spacing
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Collapse-resistant performance of RC beam-column sub-assemblages with varied section depth and stirrup spacing

机译：截面深度和箍筋间距变化的RC梁柱子组件的抗塌陷性能

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Four reinforced concrete (RC) beam-column sub-assemblages designed with different span-to-depth ratios and two with varied stirrup spacing were tested, and associated pseudo-static analyses were conducted to investigate their collapse resistance under gravitational loading. The span-to-depth ratio was varied from 4.57 to 8.0, and the stirrup spacing was increased from 10cm to 20cm. The experimental results indicated that the resistance enhancement decreased with increasing span-to-depth ratio in the arch phase and the opposite was true in the catenary resistance. The specimen failed to recover its peak arch resistance in the catenary phase as the span-to-depth ratio was reduced to 4.5. Significant shear failure was observed when the stirrup spacing was increased, and it induced premature catenary action under the gravitational loading. The pseudo-static analysis results suggested that the catenary action was effective only if the peak arch resistance could be recovered. Hence, the peak arch resistance should be regarded as the collapse resistance for RC members with lower span-to-depth ratios. Also, the dynamic increase factor increased with plastic deformation and span-to-depth ratio in the catenary phase. This indicated that the empirical formulae recommended in current available guidelines are only suitable for alternate load path analysis without considering the catenary action. Copyright (c) 2014 John Wiley & Sons, Ltd.
机译：测试了四个设计为不同的跨深比的钢筋混凝土（RC）梁柱子组件和两个具有不同的箍筋间距的子组件，并进行了相关的拟静力分析，以研究它们在重力载荷下的抗倒塌性能。跨度与深度之比从4.57更改为8.0，并且箍筋间距从10cm增加到20cm。实验结果表明，在拱形阶段，电阻的增加随跨度比的增加而减小，而悬链电阻则相反。当跨度与深度之比降低到4.5时，样品在悬链线阶段无法恢复其最大的拱弓阻力。当箍筋间距增加时，观察到显着的剪切破坏，并且在重力载荷下引起过早的悬链线作用。拟静力分析结果表明，只有在峰值抗拱能力得以恢复的情况下，悬链作用才有效。因此，对于较低的跨度与深度之比的钢筋混凝土构件，应将最大拱拱阻力视为抗塌陷性。另外，在悬链线阶段，动态增加因子随着塑性变形和跨度与深度之比的增加而增加。这表明当前可用指南中推荐的经验公式仅适用于备用载荷路径分析，而无需考虑悬链线作用。版权所有（c）2014 John Wiley＆Sons，Ltd.

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