缓黏结预应力筋拉拔试验细观数值模拟

肖启晟; 熊学玉

doi:10.13204/j.gyjzg21061507

缓黏结预应力筋拉拔试验细观数值模拟

doi: 10.13204/j.gyjzg21061507

肖启晟,
熊学玉^,

同济大学预应力研究所, 上海 200092

基金项目:

国家自然科学基金项目（52078364）；安徽省住房城乡建设科学技术计划项目（2020-YF21）

详细信息

作者简介:
肖启晟,男,1993年出生,博士研究生

通讯作者:
熊学玉,xueyu@tongji.edu.cn。

计量
- 文章访问数: 143
- HTML全文浏览量: 30
- PDF下载量: 5
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-15
- 网络出版日期: 2022-02-21

MESO-SCALE SIMULATIONS OF PULL-OUT TESTS FOR RETARDED BONDED TENDONS

XIAO Qisheng,
XIONG Xueyu^,

Institute of Prestressed Structures, Tongji University, Shanghai 200092, China

摘要

摘要: 在结构体系的受力性能上，缓黏结预应力体系相比于有黏和无黏预应力体系的区别主要源自于筋材与混凝土之间黏结作用关系的差异。受限于观测手段，拉拔试验中主要通过黏结-滑移关系曲线判断黏结作用情况。相较于试验方法，数值模拟方法可以量化观测和提取在黏结作用过程中材料产生的损伤和断裂情况。采用修正的内聚力模型（CZM）在细观尺度上模拟了缓黏结预应力筋与混凝土的黏结作用过程，在宏观力学行为和破坏形态上得到了较好的模拟结果。通过所提取的损伤和裂缝开展数据，探讨因为材料的断裂和裂缝扩展演化所导致的非线性黏结作用行为。
- 缓黏结预应力 /
- 细观数值模拟 /
- 黏结作用 /
- 裂缝演化
Abstract: From the standpoint of the structures' mechanical properties, the biggest difference between the retarded-bonded prestressed system and the bonded/unbonded prestressed system stems from the difference in the bond relationship between tendons and concrete. Limited by the observation methods, the bond-slip relationship curves are mainly used to judge the bond behavior in pull-out tests. Compared with the test method, the numerical simulation method can quantitatively observe and extract the damage and fracture of the material during the bonding process. In this paper, the modified CZM model was used to simulate the bonding process between the retard-bonded prestressed tendons and concrete at meso-scale. The macro mechanical response and failure modes of simulation results could achieve good agreements with those of experimental results. Based on the extracted damage and crack propagation data during the bonding process, the nonlinear bonding behavior caused by the damage evolution and crack propagation was discussed.
- retarded-bonded prestressing /
- meso-scale simulation /
- bond action /
- crack propagation

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