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首页> 外文期刊>Magazine of Concrete Research >Effect of confinement on the efficiency of bottle-shaped struts
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Effect of confinement on the efficiency of bottle-shaped struts

机译：限制对瓶形支柱效率的影响

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摘要

Isolated strut tests were performed to study the effect of plain concrete lateral confinement on the efficiency of two-dimensional (2D) and three-dimensional (3D) bottle-shaped struts. For the 2D struts, thin plain concrete panels of varying width were tested to failure under in-plane compression. For the 3D struts, short square columns of varying cross-section were tested to failure under axial compression. The strut efficiency in short columns was found to increase with cross-section as expected, although the increase became insignificant beyond a certain limit. However, the strut efficiency in the panels increased with an increase in panel width only up to half the panel height and thereafter reduced significantly. Supported by finite-element modelling, the results revealed the hitherto unknown phenomenon that excessive confinement negatively impacts on the efficiency of wide bottle-shaped struts only in planar (plane stress) concrete members.
机译：进行了独立的支柱测试，以研究普通混凝土侧向约束对二维（2D）和三维（3D）瓶形支柱的效率的影响。对于2D支撑杆，测试了不同宽度的薄混凝土面板在面内压缩下的破坏。对于3D支柱，测试了横截面不同的短方柱在轴向压缩下的破坏。发现短柱的支撑效率会按预期的那样随横截面而增加，尽管在超过一定限制时这种增加是微不足道的。然而，面板中的支柱效率随着面板宽度的增加而增加，仅达到面板高度的一半，然后显着降低。在有限元建模的支持下，结果揭示了迄今未知的现象，即仅在平面（平面应力）混凝土构件中，过度约束会对宽瓶形支杆的效率产生负面影响。

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