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学者姓名：张广达
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Abstract ：
为探究高韧性水泥基复合材料(Engineered Cementitious Composite,ECC)合理配合比,减少配合比对ECC性能的不利影响从而改善ECC的工作表现,在保持聚乙烯纤维(PE纤维)体积掺量2%的基础上,以砂胶比、粉煤灰替代率和减水剂掺量为基本参数设置9组正交试验进行流动指标、抗压、抗拉性能以及极限应变测试,并对实验结果中的影响参数进行分析.试验分析结果表明,在满足试验强度设计要求前提下,当选择0.3、35%、0.003比例的砂胶比、粉煤灰替代率和减水剂掺量配合比时,所得到PE-ECC流动性能、抗压强度、抗拉强度以及极限应变最佳,相比基础配合比显著改善了ECC的工作表现.
Keyword ：
ECC ECC 正交试验 正交试验 聚乙烯纤维 聚乙烯纤维 配合比 配合比
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| GB/T 7714 | 杨明清 , 胡德津 , 许莉 et al. 高韧性水泥基复合材料配合比优化研究 [J]. | 城市道桥与防洪 , 2025 , (1) : 251-255 . |
| MLA | 杨明清 et al. "高韧性水泥基复合材料配合比优化研究" . | 城市道桥与防洪 1 (2025) : 251-255 . |
| APA | 杨明清 , 胡德津 , 许莉 , 林若鸣 , 李文勃 , 张广达 . 高韧性水泥基复合材料配合比优化研究 . | 城市道桥与防洪 , 2025 , (1) , 251-255 . |
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Abstract ：
承插连接由于具有整体性能好、施工工序简单和拼装容许误差大等优点,成为预制装配桥墩节点的有效连接方式之一.为探明桩基础承插节点的冲切失效模式及承载力计算方法,采用ABAQUS有限元软件建立预制装配墩柱-桩基础承插节点数值计算模型,通过UHPC-NC直剪试验和墩柱-桩基础轴压试验进行了数值模型校验,研究了底板、接缝和承插连接参数对预制装配墩柱-桩基础承插节点的冲切传力机制、承载能力和失效模式的影响规律,提出了预制装配墩柱-桩基础承插节点冲切承载力计算公式.数值模拟结果表明,预制装配墩柱-桩基础承插节点的传力路径沿墩柱底部到桩的顶部;峰值荷载过后,承台底部混凝土开裂失效;接缝承载力和UHPC与混凝土之间的接触面积呈正相关,承台的冲切承载力与底板高度呈正相关.此外,当承插深度与底板高度之比由0.60增大到2.08时,接缝承载力提升了 80.2％,而承插连接以及底板承载力分别降低了 27.7％、52.9％,承插连接参数与底板参数具有相同的变化趋势,且底板承载力对承插连接承载力的占比较大,说明底板对承插节点承载力的贡献起主导作用.通过对已有试验和数值模拟分析,将底板和接缝的贡献系数分别取为1.00和0.92,为类似预制装配墩柱-桩基础承插节点冲切承载力的计算提供了依据.
Keyword ：
冲切性能 冲切性能 墩柱-桩基础 墩柱-桩基础 承插节点 承插节点 承载力分配关系 承载力分配关系 界面黏聚力 界面黏聚力 荷载传递路径 荷载传递路径
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| GB/T 7714 | 谢濠君 , 张广达 , 韩强 et al. 预制装配墩柱-桩基础承插节点冲切性能研究 [J]. | 市政技术 , 2024 , 42 (10) : 106-118 . |
| MLA | 谢濠君 et al. "预制装配墩柱-桩基础承插节点冲切性能研究" . | 市政技术 42 . 10 (2024) : 106-118 . |
| APA | 谢濠君 , 张广达 , 韩强 , 杜修力 . 预制装配墩柱-桩基础承插节点冲切性能研究 . | 市政技术 , 2024 , 42 (10) , 106-118 . |
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Abstract ：
Prefabrication assembly technology has been widely recognized due to its rapid construction, minimal environmental impact, and superior quality of precast components. The reliability and construction convenience of the connection joints of precast components are particularly important. In this paper, a novel Ultra High-Performance Concrete (UHPC)-filled concrete-filled steel tube (CFST) socket connection (UCSC) was proposed for the column-beam connection. To explore the shear behavior and shear load transfer mechanism of UCSC joints, four direct shear experiments were conducted in terms of different parameters (socket depth, presence of studs). Meanwhile, ABAQUS was used to perform a systematic parametric analysis (socket length, embedded length, outer diameter of CFST, thickness of steel tube). The results indicated that the shear performance of UCSC joints was significantly influenced by both the socket depth and the outer diameter of CFST. The proposed finite element model (FEM) can predict the load-displacement relationships of UCSC joints with a maximum peak load error of 2.3 %. Combining the experimental results and numerical results, a simplified calculation model was formulated to accurately estimate the shear bearing capacity of UCSC joints, and was verified by numerical and experimental results with a maximum error of 8.6 %. The research results have practical implications for the preliminary design of UCSC joints to avoid non-ideal failure mode. © 2024 Elsevier Ltd
Keyword ：
Environmental impact Environmental impact Environmental technology Environmental technology Failure (mechanical) Failure (mechanical) High performance concrete High performance concrete Tubular steel structures Tubular steel structures
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| GB/T 7714 | Su, Sibo , Zhang, Guangda , Yu, Jiexin et al. Shear performance and failure mechanism of socket CFST column-beam connection with UHPC grouting [J]. | Engineering Structures , 2024 , 313 . |
| MLA | Su, Sibo et al. "Shear performance and failure mechanism of socket CFST column-beam connection with UHPC grouting" . | Engineering Structures 313 (2024) . |
| APA | Su, Sibo , Zhang, Guangda , Yu, Jiexin , Han, Qiang , Zhou, Daxing , Du, Xiuli . Shear performance and failure mechanism of socket CFST column-beam connection with UHPC grouting . | Engineering Structures , 2024 , 313 . |
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