预应力混凝土梁超载能力分析

赵卫国

预应力混凝土梁超载能力分析

赵卫国

1.
长安大学公路学院陕西西安 710064
2.
河北省交通厅公路局河北石家庄 050051

基金项目:

国家西部变通建设科技项日 2005 318 223 16

河北省交通科技项目 Y-030201

详细信息

作者简介:
赵卫国(1971-), 男, 河北石家庄人, 河北省交通厅公路局高级工程师, 从事桥梁加固研究

中图分类号: U448.35
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- 被引次数: 0
出版历程
- 收稿日期: 2007-04-13
- 刊出日期: 2007-10-25

Overload capacity analysis of prestressed reinforced concrete beam

ZHAO Wei-guo

1.
School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China
2.
Bureau of Highway, Department of Communications of Hebei Province, Shijiazhuang 050051, Hebei, China

More Information

Author Bio:
Zhao Wei-guo(197l-), male, senior engineer, +86—311—83035215, highway27@sohu.com

摘要

摘要: 为了验证利用有限元法分析预应力混凝土梁极限承载能力的准确性, 对T形预应力混凝土模型梁进行了极限承载力加载破坏试验, 采用ANSYS有限元程序, 建立了T梁的分离式有限元模型, 分析了模型梁从加载到破坏全过程的受力和变形。发现利用实验与有限元法得到T梁的荷载-挠度曲线与荷载-应变曲线的变化趋势一致, 并呈现良好的非线性, 但是通过荷载试验得到T梁的超载能力为9.07 kN·m, 按照有限元分析得到的超载能力为12.48 kN·m, 偏差较大, 原因是分析模型偏于理想化。分析结果表明: 利用有限元法在总体上能够有效地模拟钢筋混凝土梁受力全过程中各个量的非线性变化, 对超载能力的求解是可行的。
- 桥梁工程 /
- 预应力混凝土梁 /
- 极限承载力 /
- 有限元法
Abstract: In order to attested the analysis veracity of ultimate bearing capacity for prestressed concrete beam with finite element method, an loading experiment of ultimate bearing capacity was carried out, a detached finite element model of T beam was designed by using ANSYS finite element program, and the whole processes of T beam's stress and deformation from loading to destructing were analyzed.It is pointed that the variational trends of T beam's load-deflection curves and load-strain curves gained by experiment and the model are accordant, and the curves have good nonlinearity, but the experimental value of ultimate bearing capacity is 9.07 kN·m, the computational value is 12.48 kN·m, their error is appreciably big because of the idealization of the model.Analysis result shows that the nonlinear variations of all variables for prestressed reinforced concrete beam may are simulated by using finite element method in loading process as a whole, and the solution of ultimate bearing capacity is feasible.
- bridge engineering /
- prestressed reinforced concrete beam /
- ultimate bearing capacity /
- finite element method

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图 1 试验梁

Figure 1. Test beam

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图 2 配筋

Figure 2. Steel distribution

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图 3 加载

Figure 3. Loading

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图 4 加载梁

Figure 4. Loading beam

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图 5 压溃梁

Figure 5. Compression failure beam

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图 6 荷载-挠度曲线

Figure 6. Load-deflection curves

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图 7 荷载-应变曲线

Figure 7. Load-strain curves

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图 8 钢绞线的荷载-应变曲线

Figure 8. Load-strain curves of prestressed wire

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表 1 挠度、应力与应变计算值

Table 1. Calculation values of deflection, stress and strain

序号	荷载/kN	应变10⁶ε	应力/MPa	挠度/mm
1	0.00	4 254.5	808.37	2.847
2	4.17	4 262.1	809.75	2.107
3	7.83	4 282.7	813.62	1.641
4	11.83	4 302.4	817.35	0.916
5	15.83	4 310.2	818.88	0.231
6	18.00	4 325.9	821.78	-0.154
7	22.00	4 349.8	826.34	-0.891
8	24.00	4 360.1	828.52	-1.259
9	25.33	4 380.3	832.22	-1.812
10	25.83	4 387.8	837.57	-1.899
11	26.83	4 397.5	838.63	-2.435
12	27.83	4 408.6	839.09	-2.778
13	29.83	4 427.3	843.91	-3.849
14	32.00	4 452.1	847.03	-5.157
15	33.00	4 463.5	851.93	-5.757
16	34.67	4 488.3	856.88	-6.678
17	37.67	4 541.8	862.80	-8.688
18	39.83	4 582.9	870.59	-10.317
19	42.00	4 652.6	883.85	-12.213
20	45.00	4 720.3	896.79	-15.615

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表 2 试验数据

Table 2. Test data

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参考文献(8)

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