| 引用本文: | 白崇喜,郑文忠.无粘结CFRP筋预应力梁刚度及裂缝的计算[J].哈尔滨工业大学学报,2010,42(8):1206.DOI:10.11918/j.issn.0367-6234.2010.08.006 |
| BAI Chong-xi,ZHENG Wen-zhong.Calculation for stiffness and crack of beams partially prestressed with unbonded CFRP tendons[J].Journal of Harbin Institute of Technology,2010,42(8):1206.DOI:10.11918/j.issn.0367-6234.2010.08.006 |
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| 摘要: |
| 为了推导表达形式统一的无粘结CFRP筋部分预应力混凝土梁刚度及裂缝宽度计算公式,定义了无粘结CFRP筋应力增量与有粘结钢筋应力增量的比值为无粘结CFRP筋等效折减系数.在刚度计算公式中用无粘结CFRP筋的等效折减面积与普通钢筋面积之和与截面有效面积之比这一等效纵向受拉钢筋配筋率替代现行规范中的纵向受拉钢筋配筋率,在裂缝宽度计算公式中用无粘结CFRP筋的等效折减面积与普通钢筋面积之和这一等效纵向受拉钢筋面积替代现行规范中的纵向受拉钢筋面积.从而形成了与现行规范相协调的刚度及裂缝宽度计算公式,公式的计算结果与试验结果吻合良好. |
| 关键词: 无粘结CFRP筋 受弯构件 刚度 裂缝 |
| DOI：10.11918/j.issn.0367-6234.2010.08.006 |
| 分类号:TU378 |
| 基金项目:国家教育部长江学者奖励计划资助项目(2009-37) |
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| Calculation for stiffness and crack of beams partially prestressed with unbonded CFRP tendons |
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BAI Chong-xi, ZHENG Wen-zhong
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School of Civil Engineering,Harbin Institute of Technology,Harbin 150090,China
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| Abstract: |
| In order to deduce unified expressed formulas of stiffness and crack width of concrete beams partially prestressed with unbonded CFRP tendons,the equivalent reduced coefficient of unbonded CFRP tendons is defined as the ratio of the stress increment of unbonded CFRP tendons to that of bonded steel bars.If the ratio of longitudinal tension reinforcement in the stiffness formula in current code is replaced by the ratio of the sum of the equivalent reduced area of unbonded CFRP tendons and the area of steel bars to effective cross-sectional area,and the area of total longitudinal tension reinforcement in the crack width formula in current code is replaced by the sum of the equivalent reduced area of unbonded CFRP tendons and the area of steel bars,the stiffness formula and crack width formula in accordance with current code can be developed.The calculated results by using these two formulas are in good agreement with test results. |
| Key words: unbonded CFRP tendons flexural member stiffness crack |
