| 预应力内置圆钢管桁架混凝土组合梁的受力性能 |
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| 引用本文： | 张博一,郑文忠,苑忠国.预应力内置圆钢管桁架混凝土组合梁的受力性能[J].吉林大学学报(工学版),2008,38(3):636-0641. |
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| 作者姓名： | 张博一 郑文忠 苑忠国 |
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| 作者单位： | 1. 哈尔滨工业大学土木工程学院,哈尔滨,150090
2. 吉林电子信息职业技术学院材料工程系,吉林省,吉林市,132021 |
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| 基金项目： | 教育部跨世纪优秀人才培养计划
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黑龙江省科技攻关项目
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黑龙江省哈尔滨市科技攻关计划 |
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| 摘 要： | 通过4根预应力内置圆钢管桁架混凝土组合简支梁的试验,得到了试验梁的荷载-跨中挠度曲线、正截面承载力、裂缝分布与展开特征。结果表明:可基于平截面假定计算该类组合梁正截面的承载力,该类组合梁的平均裂缝间距取决于下弦钢管外径及下弦二钢管截面面积之和与截面有效受拉混凝土面积的比值。提出了与试验结果吻合良好的裂缝宽度和刚度计算公式。
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| 关 键 词： | 工程力学 内置圆钢管桁架混凝土组合梁 正截面承载力 刚度 裂缝宽度 预应力 |
| 文章编号： | 1671-5497(2008)03-0636-06 |
| 收稿时间： | 2007-04-25 |
| 修稿时间： | 2007年10月25 |
Mechanical properties of truss concrete composite beam preslressed encased with circular steel tubes |
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| Zhang Bo-yi,Zheng Wen-zhong,Yuan Zhong-guo.Mechanical properties of truss concrete composite beam preslressed encased with circular steel tubes[J].Journal of Jilin University:Eng and Technol Ed,2008,38(3):636-0641. |
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| Authors: | Zhang Bo-yi Zheng Wen-zhong Yuan Zhong-guo |
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| Abstract: | A truss concrete composite free-supported beam prestressed encased with 4 circular steel tubes was tested and its curve of load-deflection at mid span,the bending loading capacity,the distribution and development of the cracks were obtained.The results showed that the pure bending region of the beam accords with the plane section assumption from loading to failure,and the average crack spacing depends on the external diameter of the bottom chord tube and the ratio of the sum of the section areas of the two bottom chord tubes to the effective tensile concrete area.The formulas for the bending loading capacity,the stiffness,and the crack width which are in good agreement with the test results of the beam were presented. |
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| Keywords: | engineering mechanics truss concrete composite beam prestressed encased with circular steel tubes bending loading capacity stiffness crack width prestress |
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