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Development length on concrete with bundle bars

机译：在混凝土的发展长度与束栏

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The Development Length is an essential factor in the design of reinforced concrete structures.On the other hand,reinforced concrete allows the existence of bundle bars as one of the solutions in overcoming dimensional limitations.However,the use of bundle bars causes some of the reinforcing surfaces not to be covered with concrete,resulting in bond strength between the reinforcement and the concrete will reduce.So,it is necessary to research how far the development length on the concrete with bundle bars,can achieve the desired performance.The methodology used with Pull Out on concrete cylindrical test objects with bundle bars and single bar.Variations in the development length are given to 100 mm,125 mm,and 150 mm.Gradual loading until a break occurs.Pull Out test results indicate a caesarean movement from the loaded end to the free end.The variation in the development length given appears to affect the greater load tensile requirements of the bundle bars compared with the single bar.This can be seen from the amount of bond stress generated which tends to decrease with increasing length of the development length.
机译：开发长度是钢筋混凝土结构设计的必要因素。另一方面，钢筋混凝土允许将束条作为克服尺寸局限性的一个解决方案之一。但是，使用束杆的使用导致一些增强剂不应用混凝土覆盖的表面，导致加固和混凝土之间的粘合强度会减少。所以有必要研究混凝土的开发长度与束杆，可以达到所需的性能。使用的方法用束杆和单个条形拉出混凝土圆柱形试验物体。开发长度的Variations给予100 mm，125 mm和150 mm。突破直到发生突破。试验结果表明来自装载的剖腹产结束到自由端。与单个杆相比，给出的开发长度的变化似乎影响了束杆的负载拉伸要求。从产生的粘合应力量可以看出，随着显影长度的增加而倾向于降低。

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