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| 植筋锚固对新老混凝土粘结斜剪性能的影响研究 |
| Study on the effect of reinforcement anchorage on the oblique shear performance of new and old concrete bonding |
| 投稿时间：2024-12-11 修订日期：2025-02-22 |
| DOI： |
| 中文关键词: 大坝加高 新老混凝土 植筋 斜剪试验 摩擦抗剪理论 斜截面承载力计算 |
| 英文关键词:Dam heightening New-to-old concrete Reinforcement planting Oblique shear test Frictional shear theory Calculation of oblique section bearing capacity |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 中文摘要: |
| 在大坝加高工程中，新老混凝土的粘结质量直接关系到整个大坝结构的稳定和安全。混凝土斜剪试验能够模拟植筋锚固对新老混凝土粘结面在实际工作状态下受到的斜向剪切力。本文通过对植筋新老混凝土粘结试件进行斜剪试验，分析了植筋深度、植筋率和植筋方式对新老混凝土粘结试件斜剪性能的影响规律。结果表明：无植筋试件破坏属于脆性破坏，植筋试件破坏属于延性破坏；试件斜剪强度随植筋率和植筋深度的增加而增大；四种植筋方式下试件斜剪强度大小关系为：倒三角排列方式植筋＞上下排列方式植筋＞正三角排列方式植筋＞水平排列方式植筋。水平排列植筋方式和倒三角形排列植筋方式的斜剪强度比无植筋试件分别提高了73.38%和210.24%。将摩擦抗剪理论与斜截面承载力计算公式结合，得到植筋锚固新老混凝土粘结斜剪承载力计算模型，为评估不同植筋状态下新老混凝土粘结斜剪强度提供理论参考。 |
| 英文摘要: |
| In the dam heightening project, the bonding quality of the new and old concrete is directly related to the stability and safety of the entire dam structure. The concrete oblique shear test can simulate the oblique shear forces experienced by the bonding interface between new and old concrete with reinforcement anchoring under actual working conditions. In this paper, the influence of planting depth, planting ratio and planting method on the oblique shear performance of new and old concrete bonded specimens is analyzed by conducting oblique shear tests on new and old concrete bonded specimens. The results show that the failure of the non-planted reinforcement specimen is brittle failure, and the failure of the planted reinforcement specimen is ductile failure. The oblique shear strength of the specimen increases with the increase of the planting reinforcement rate and planting depth. The relationship between the oblique shear strength of the specimen under the four planting reinforcement methods is as follows: The inverted triangle arrangement> the upper and lower arrangement> the regular triangle arrangement> the horizontal arrangement. The oblique shear strength of the horizontal and inverted triangle reinforcement planting methods is 73.38% and 210.24% higher than that of the non-planting reinforcement specimens, respectively. By integrating the friction shear theory with the calculation formula of oblique cross-sectional bearing capacity, the calculation model of the bonded oblique shear capacity of new and old concrete anchored by planting reinforcement is obtained, which provides a theoretical reference for evaluating the bonded oblique shear strength of new and old concrete under various reinforcing bar anchoring conditions. |
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