后张预应力钢束有效预应力分布模式判别与模拟方法

郭琦; 贺拴海; 任伟

后张预应力钢束有效预应力分布模式判别与模拟方法

郭琦^{1, 2,},
贺拴海²,
任伟²

1.
西安建筑科技大学土木工程学院陕西西安 710055
2.
长安大学桥梁与隧道陕西省重点实验室陕西西安 710064

基金项目:

国家西部交通建设科技项目 200531881215

详细信息

作者简介:
郭琦(1976-), 男, 陕西西安人, 西安建筑科技大学讲师, 工学博士, 从事在役混凝土桥梁检测与结构评估研究

中图分类号: U441.5
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- 文章访问数: 253
- HTML全文浏览量: 86
- PDF下载量: 602
- 被引次数: 0
出版历程
- 收稿日期: 2008-06-12
- 刊出日期: 2008-12-25

Distribution mode determination and simulation method of effective prestress for post-prestressing tendon

GUO Qi^{1, 2
,},
HE Shuan-hai²,
REN Wei²

1.
School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, Shaanxi, China
2.
Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang'an University, Xi'an 710064, Shaanxi, China

More Information

Author Bio:
GUO Qi (1976-)malelecturerPhD+86-29-82334872gq8558@126.com

摘要

摘要: 在大、中跨径混凝土桥梁预应力状况检测及评价的实施过程中, 为了获知预应力束筋当前预应力有效值及其分布状态, 提出了有效预应力沿程分布的统一模拟方法。基于预应力损失理论, 建立了具有普遍意义的拟摩阻损失函数简化解析算法。以单束可控测点处的应力测值为已知条件, 结合钢束沿程有效预应力分布状况的隶属模式判别, 完成了名义损失参数识别, 实现了复杂几何型式钢束实际有效预应力沿程分布规律的统一模拟。模拟结果表明: 有效预应力相对误差阈值为5%, 满足工程精度要求, 因此, 统一模拟方法可行。
- 桥梁工程 /
- 预应力混凝土 /
- 有效预应力 /
- 拟摩阻损失 /
- 名义损失参数
Abstract: In order to know the effective value and longitudinal distribution state of effective prestress in inspection and evaluation process on the present condition of prestressing tendon for middle-span and long-span concrete bridges, an unified simulation method of the distribution was put forward. Based on prestress loss theory, a simplified analytic algorithm of virtual frictional loss function was set up in a universal way. By the means of the obtained stress datum of steel tendon at control point, the subordinated mode of effective prestress distribution along longitudinal direction was determined. As regards the effective prestress of steel tendon with complicated geometry pattern, its distribution regularity was simulated after the recognition of nominal coefficients for prestress loss. Simulation result shows that the relative error of effective prestress threshold is 5%, so the simulation method is feasible.
- bridge engineering /
- prestressed concrete /
- effective prestress /
- virtual frictional loss /
- nominal coefficient of prestress loss

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图 1 预应力损失的组成

Figure 1. Composition of prestress loss

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图 2 摩阻特性关联系数

Figure 2. Relevant parameter of frictional loss

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图 3 预应力筋某曲线段位置

Figure 3. Position of partial curve of prestressed steel tendon

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图 4 弯道钢束微段力的平衡关系

Figure 4. Infinitesimal equilibriums of forces for curved steel tendon

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图 5 简化计算图式

Figure 5. Curt calculation mode

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图 6 相对误差曲线

Figure 6. Relative error curve

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图 7 损失算法

Figure 7. Loss algorithm

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图 8 钢束有效预应力计算结果比较

Figure 8. Comparison of computational results for effective prestresses of steel tendon

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图 9 程序流程

Figure 9. Program flow

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图 10 预应力钢束形状

Figure 10. Profile of prestressing tendon

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表 1 AASHTO规程总损失值

Table 1. Total loss of AASHTO specification

下载: 导出CSV

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