| 钢筋混凝土抗拔灌注桩的抗裂设计 |
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| 引用本文： | 姚梅红.钢筋混凝土抗拔灌注桩的抗裂设计[J].福建工程学院学报,2016,0(6):518-525. |
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| 作者姓名： | 姚梅红 |
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| 作者单位： | 福建船政交通职业学院 道路工程系 |
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| 摘 要： | 通过对不同直径的抗拔灌注桩在不同抗拔荷载、不同裂缝控制等级下的抗裂设计及其纵筋用钢量与造价的对比分析，说明桩纵筋采用普通非预应力钢筋时，因受裂缝宽度的限制，其纵筋拉应力水平明显偏低，桩承受的抗拔力越大，纵筋的应力越小，相比普通钢筋混凝土桩，采用预应力螺纹钢筋的抗拔桩不仅可显著减少用钢量，当抗拔力较高时，还可节省约40%~50%的纵筋造价；同时进一步探讨抗拔桩预应力筋的配置及有效预应力的控制方法。
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| 关 键 词： | 抗拔灌注桩 预应力 预应力螺纹钢筋 裂缝控制 用钢量 |
Anti-crack design for reinforced concrete anti-uplift cast-in-place pile |
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| Yao Meihong.Anti-crack design for reinforced concrete anti-uplift cast-in-place pile[J].Journal of Fujian University of Technology,2016,0(6):518-525. |
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| Authors: | Yao Meihong |
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| Institution: | Road Construction Department, Fujian Chuangzheng Communications College |
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| Abstract: | The anti-cracking design for different uplift caste-in-place piles was analysed in the perspective of consumption and cost of the longitudinal bars. The variables of aforementioned piles include different diameters, different anti-pulling load and different crack control level. Since the experimenal results indicate that the longitudinal bars of pile have a significantly inadequate pulling stress level because of its limitation of maximum crack width, it is concluded that the stress of the longitudinal bar will be lower when the uplift force of the pile is stronger. Compared with common reinforcement concrete piles, the uplift piles containing prestressed screw bar not only reduce the consumption of steel significantly, but also save about 40%~50% of the longitudinal reinforcement cost when the anti-uplift force is high. Moreover, the arrangement for prestressed reinforcement and the control method of the effective prestress are also discussed. |
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| Keywords: | anti-uplift cast-in-situ pile prestress prestressing screw bar crack control steel consumption |
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