周威, 胡海波. 预留孔道活性粉末混凝土局压性能与承载力分析[J]. 工程力学, 2014, 31(7): 119-128. DOI: 10.6052/j.issn.1000-4750.2013.01.0071
引用本文: 周威, 胡海波. 预留孔道活性粉末混凝土局压性能与承载力分析[J]. 工程力学, 2014, 31(7): 119-128. DOI: 10.6052/j.issn.1000-4750.2013.01.0071
ZHOU Wei, HU Hai-bo. ANALYSIS ON BEARING CAPACITY AND BEHAVIOR OF REACTIVE POWDER CONCRETE WITH EMPTY CONCENTRIC DUCT UDER LOCAL PRESSURE[J]. Engineering Mechanics, 2014, 31(7): 119-128. DOI: 10.6052/j.issn.1000-4750.2013.01.0071
Citation: ZHOU Wei, HU Hai-bo. ANALYSIS ON BEARING CAPACITY AND BEHAVIOR OF REACTIVE POWDER CONCRETE WITH EMPTY CONCENTRIC DUCT UDER LOCAL PRESSURE[J]. Engineering Mechanics, 2014, 31(7): 119-128. DOI: 10.6052/j.issn.1000-4750.2013.01.0071

预留孔道活性粉末混凝土局压性能与承载力分析

ANALYSIS ON BEARING CAPACITY AND BEHAVIOR OF REACTIVE POWDER CONCRETE WITH EMPTY CONCENTRIC DUCT UDER LOCAL PRESSURE

  • 摘要: 以端部局压下预留贯通圆形孔道活性粉末混凝土块体模拟后张预应力活性粉末混凝土结构的锚固区,进行了9个轴心局压试验。发现其开裂与破坏有明显的突然性与一定的脆性:初裂为近似贯穿全高的“中宽端细”侧面纵向裂缝,破坏前裂缝充分发展且不断掉块,破坏时试件劈裂,为先裂后坏的破坏模式。对比试验表明,预留孔道对承压板下楔形体的削弱作用显著,致使局压区侧表面开裂延迟,局压承载力降低。基于试验结果,考虑局压面积比、孔道直径与局压边长比等关键参数影响,提出了预留孔道活性粉末混凝土局部受压承载力实用计算方法。

     

    Abstract: The reactive powder concrete (RPC) block with an empty concentric duct was used to simulate the anchorage zone concentratedly loaded by post-tensioned tendons. Nine specimens were built and loaded monotonically to failure. All specimens cracked and failed suddenly and brittely. The first cracks were found on the side face of specimens. These cracks longitudinally extended to the near height of specimens, and their widths were larger in the middle part than in both ends. Cracks developed and RPC falled out continuously near to failure. The failure model is splitting with following cracking. Contrast to specimens without ducts, the duct evidently weakened the local wedge zone ahead of a bearing plate. It results in specimens-cracking slowly and decreases local bearing capacity. The local bearing capacity of a RPC block with an empty duct is dependent on two critical parameters directly related to the geometry of the zone. One is the ratio of the net area of RPC supporting the plate to the area of the bearing plate. Another important parameter is the ratio of the diameter of a duct to the side length of the local pressure. An expression of the local bearing capacity of RPC with an empty concentric duct is proposed on the basis of experimental results.

     

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