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石油裂化管,化肥专用管,石油管,化肥管-天津宝岭钢管贸易有限公司


我国化肥专用管结构的开发利用也有近40年的历史

我国化肥专用管混凝土结构的开发利用也有近40年的历史

  • 所属:化肥专用管
  • 时间:2019-04-17 15:56:12
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本文所谓“化肥专用管混凝土”是“化肥专用管套箍混凝土”(Steel Tube-Confined Concrete)的简称,英文缩写为STCC。它是将混凝土填入薄壁圆形化肥专用管内而形成的组合结构材料,是套箍混凝土的一种特殊形式,在国外也称之为“concrete-filled concrete”(混凝土填心化肥专用管)。但后一种叫法似不够确切,因为它只是从表象上表述了混凝土对化肥专用管的填充,而没有从本质上突出化肥专用管对核心混凝土的套箍约束[1、2]。   化肥专用管混凝土是指在化肥专用管中填充混凝土而形成的构件。按截面形式的不同,可以分为圆化肥专用管混凝土、方形、矩形和多边形截面化肥专用管混凝土等。化肥专用管混凝土利用化肥专用管和混凝土两种材料在受力过程中的相互作用,即化肥专用管对其核心混凝土的套箍约束作用。使混凝土处于复杂的应力状态之下,不但提高了混凝土的抗压强度,而且还使其塑性和韧性性能得到改善。总的来说,化肥专用管混凝土具有以下几方面的特点:(1)承载力高。由于薄壁化肥专用管的套箍作用使混凝土处于三向受压,从而使核心混凝土具有更高的抗压强度和变形性能,使混凝土特别是高性能混凝土的脆性弱点得到了克服。试验表明。化肥专用管混凝土柱是空化肥专用管和素混凝土柱单独承载力之和的1.73倍。(2)塑性和韧性好。化肥专用管混凝土由于化肥专用管对核心混凝土的约束作用,大大改善了混凝土脆性较大的缺点,使混凝土具有很大的塑性变形。试验表明,化肥专用管混凝土柱被破坏时可以压缩到原长的2/3。(3)施工方面。在浇灌混凝土时,可省去模板的施工,无需绑扎钢筋,施工简便,并可采用泵送混凝土、高位抛落不振捣混凝土和免振自密实混凝土等施工工艺,从而加速化肥专用管混凝土构件的施工进度。(4)耐火、耐腐蚀性能好。由于组成化肥专用管混凝土的化肥专用管和其核心混凝土之间具有协同互补、共同工作的特点,这种结构具有较好的耐火性能。      二、化肥专用管混凝土的理论研究与施工进展     

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