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来源：百度知道 编辑：UC知道 时间：2024/06/03 13:53:17
There is reason to believe that the configuration of a seven-wire strand (i.e., 6 small wires twisted about a slightly larger center wire) results in very good bond characteristics. It is believed the Hoyer Effect is partially responsible for this, but the relatively large surface area and twisted configuration is believed to result in a significant mechanical bond.
Although these theoretical relationships are of academic interest, they have little practical application, due to the inability of designers and fabricators of pre-stressed concrete to control the several factors that influence the transmission length. Fortunately, there has been sufficient research into the magnitude of transmission lengths under both laboratory and production conditions for the following significant conclusions to be drawn.
(1) The bond of clean three and seven-wire pre-stressing strands and concrete is adequate for the majority of pre-tensioned concrete elements.
(2) Members that are of su
Although these theoretical relationships are of academic interest, they have little practical application, due to the inability of designers and fabricators of pre-stressed concrete to control the several factors that influence the transmission length. Fortunately, there has been sufficient research into the magnitude of transmission lengths under both laboratory and production conditions for the following significant conclusions to be drawn.
(1) The bond of clean three and seven-wire pre-stressing strands and concrete is adequate for the majority of pre-tensioned concrete elements.
(2) Members that are of su
我们有理由相信，以7配置钢绞线（即6个小线大约一稍大中心钢丝缠绕）在债券的特点非常好的效果。相信该霍耶的影响，部分为此事负责，但相对较大的表面积和扭曲的配置被认为是导致显着的机械债券。
虽然这些理论之间关系的学术兴趣是，她们的实际应用，由于设计者和制造者无法前预应力混凝土控制几个因素影响传输长度。幸运的是，一直到下传输长度级实验室及以下重要结论，生产条件，以足够的研究得出。
（1）债券的清洁三和七丝预应力钢绞线的具体足以为大多数前张预应力混凝土构件。
（2）各位，这样的性质，高的时刻可能发生的成员附近，两端如短悬臂，需要特别考虑。
（3）小直径清洁光滑电线也足以敌人前使用张紧，但传输长度为这应该是预计增加约一倍，为七绞合线（作为直径多表示类型肌腱） 。
（4）在正常条件下，清洁7绞合线可以被假定为等于50倍的传输链的直径长度。
（5）肌腱传输长度可望在一年内增加5至20％后，作为一种放松的结果发布。
（6）由火焰切割或与砂轮发布肌腱传输长度可以预期由20％至30％，比肌腱逐渐被释放更大。
（7）硬非片状表面生锈，表面缩进有效地降低了传输链和肌腱的电线需要某种形式的长度。
8）混凝土抗压强度1500年至5000（防扩散安全倡议在释放在同一顺序的传输长度的结果时间，预计链筋大于1 / 2，在这种情况下优势少于3000在较大的传输长度防扩散安全倡议的结果。
（9）看来，审慎的使用作为前释放强度最低3000防扩散预应力筋，除了非常特殊的情况。高等优势，可能需要肌腱大于1 / 2英寸