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[1]李立峰,李铁盔.体外预应力筋极限应力增量的理论分析与试验研究[J].建筑科学与工程学报,2015,32(01):27-34.
　LI Li-feng,LI Tie-kui.Theoretical Analysis and Experiment Study on Ultimate Stress Increment of Externally Prestressed Tendons[J].Journal of Architecture and Civil Engineering,2015,32(01):27-34.
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体外预应力筋极限应力增量的理论分析与试验研究(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
32卷
期数:
2015年01期
页码:
27-34
栏目:
出版日期:
2015-01-30

文章信息/Info

Title:
Theoretical Analysis and Experiment Study on Ultimate Stress Increment of Externally Prestressed Tendons
作者:
李立峰，李铁盔
湖南大学土木工程学院
Author(s):
LI Li-feng, LI Tie-kui
School of Civil Engineering, Hunan University
关键词:
体外预应力梁; 波形钢腹板组合箱梁; 极限状态; 极限应力增量; 抗弯试验
Keywords:
externally prestressed beam;  composite box girder with corrugated steel web;  limit state;  ultimate stress increment;  bending experiment
分类号:
-
DOI:
-
文献标志码:
A
摘要:
为研究体外预应力梁受弯破坏过程的力学性能及体外预应力筋极限应力增量，对比分析了各国规范关于体外预应力筋应力增量的计算方法，设计并完成了2根体外预应力波形钢腹板简支组合梁的抗弯承载力试验，编制了非线性全过程分析程序对2根梁进行了分析；以跨高比为主要变量，考虑混凝土强度、截面配筋状况、体外预应力筋有效预应力等因素，以平截面假定为基础，根据极限状态时梁截面内力平衡条件，通过增大受压区混凝土面积建立了体外预应力筋极限应力增量的简化计算公式，并用搜集到的19根试验梁数据对该计算公式加以验证。结果表明：体外预应力组合梁受弯破坏全过程与体内预应力梁基本类似，但是梁破坏时体外预应力筋还未进入屈服阶段，利用各规范公式计算的体外预应力筋极限应力增量比试验值小很多，与试验梁普通受拉钢筋屈服时的体外预应力筋应力增量相当；体外预应力筋的极限应力增量与跨中挠度近似呈直线关系；计算结果与试验结果吻合良好，该公式具有一定的参考价值。
Abstract:
In order to study the mechanical properties of externally prestressed beams under bending failure process and ultimate stress increment of externally prestressed tendons, the authors comparatively analyzed the national standardized calculation methods at home and abroad on the ultimate stress increment of externally prestressed tendons, and designed two externally prestressed composite box girders with corrugated steel webs. Moreover, the flexural bearing capacity experiment of them was completed, and a nonlinear fullrangeanalysis program was developed to perform the flexural behavior analysis. The authors took the span to depth ratio as the main variable, considering the concrete strength, sectional reinforcement status, prestressing force of externally prestressed tendons, based on the plane section assumption. According to the beam section internal force equilibrium conditions in limit state, the simple calculation formulae of ultimate stress increment of externally prestressed tendons were established by increasing the compressed concrete area. 19 experiment beams were collected to verify the calculation formulae. The results show that the flexural failure in the whole process of externally prestressed composite beams is similar with the inner prestressed beams, but the externally prestressed tendons has not yielded when the beams collapse, the values of ultimate stress increment of externally prestressed tendons calculated by standardized formulae at home and abroad are much smaller than the experiment results, yet the values are equal to the results when ordinary steel yields. The ultimate stress increment of external prestressed tendons and midspan deflection are approximate linear relationship. The calculated results agree well with the experiment results, so the formula has a certain reference value.

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更新日期/Last Update: 2015-02-03