主筋泛指在混凝土构件中承受重力荷载的钢筋，相对于构造钢筋而言，亦称纵向受力钢筋，仅在截面受拉区配置的受弯构件称单筋截面受弯构件，同时在截面受压区配置的称为双筋截面受弯构件。因此主筋按其受力不同而有受拉及受压主筋两种，受拉主筋系承受拉应力，受压主筋则承受压应力。
主要原因是穿过圆钢管的梁主筋与钢管内的混凝土有很好的粘结；
There is good bond between the concrete in steel pipe and the beam' s main steel bars passing through the small holes in steel pipe.
综合分析表明，主筋锈蚀率和疲劳循环次数影响钢筋混凝土梁的静力力学性能。
The analysis on all aspects showed that the mechanics property of the corroded reinforcement concrete beams was affected by main bar corrosion rate and the number of fatigue circles.
再者是梁、板主筋位置不准确、钢筋搭接位置不正确，导致构件承载力不足发生质量事故。
Second is the inaccurate main steel bars' position of beam or plate or wrong bonding position of steel bars causing the reduce of bearing strength.
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