| 基于改进拉-压杆模型的预应力混凝土深受弯构件受剪承载力预测 |
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| 引用本文： | 王国林,孟少平,张运涛,孙巍巍. 基于改进拉-压杆模型的预应力混凝土深受弯构件受剪承载力预测[J]. 东南大学学报(自然科学版), 2007, 37(5): 898-903 |
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| 作者姓名： | 王国林 孟少平 张运涛 孙巍巍 |
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| 作者单位： | 东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096;东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096;东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096;东南大学混凝土及预应力混凝土结构教育部重点实验室,南京,210096 |
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| 摘 要： | 以集中荷载下有粘结预应力混凝土简支深受弯构件为对象,建立了显式考虑有效预压力Fpe的改进拉-压杆模型,依据Kupfer-Gerstle双向拉压应力关系考虑了混凝土软化效应并推导了受剪承载力公式.该式也可用于分析无粘结预应力及钢筋混凝土构件.3种主要破坏模式压杆劈裂破坏、压杆或结点区压溃和拉杆屈服在公式中得到了体现.通过对4根和已有文献中39根试验梁的分析,得到试验值与预测结果的平均比值为1.15,变异系数为0.120,表明该公式预测结果精确、连续且偏于安全.
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| 关 键 词： | 预应力混凝土 深受弯构件 受剪承载力 拉-压杆模型 软化效应 |
| 文章编号： | 1001-0505（2007）05-0898-06 |
| 修稿时间： | 2007-05-25 |
Prediction of shear capacity of prestressed concrete deep flexural members based on modified strut-and-tie model |
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| Wang Guolin,Meng Shaoping,Zhang Yuntao,Sun Weiwei. Prediction of shear capacity of prestressed concrete deep flexural members based on modified strut-and-tie model[J]. Journal of Southeast University(Natural Science Edition), 2007, 37(5): 898-903 |
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| Authors: | Wang Guolin Meng Shaoping Zhang Yuntao Sun Weiwei |
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| Affiliation: | Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Southeast University, Nanjing 210096, China |
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| Abstract: | A modified strut-and-tie model is established for bonded prestressed concrete simply supported deep flexural members subjected to concentrated loads.The effective prestressing force Fpe is explicitly built in the model.A formula is derived based on the Kupfer-Gerstle biaxial tension-compression relationship considering the concrete softening effect.The formula can also be used for unbonded prestressed and reinforced concrete members.Three primary modes of failure are expressed in the formula,that is,diagonal splitting of struts,crushing of struts or nodal zones and yielding of ties.A comparison of 43 beams,of which 4 beams were studied by authors and the others were from literature,shows that the predictions are accurate,consistent and conservative with an average ratio of test result to prediction of 1.15 and a variation coefficient of 0.120. |
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| Keywords: | prestressed concrete deep flexural member shear capacity strut-and-tie model softening effect |
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