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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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Concrete-filled steel tube possesses excellent mechanical properties and has been gaining increasing attention for its application in prefabricated pier-cap beam joints with socket connections. To comprehensively investigate the nonlinear force-displacement relationship of the prefabricated pier-cap beam joint with concrete-filled steel tube socket connection under cyclic loading, this paper first developed a mechanical analysis model for the joint. The deformation equation of the socket connection segment was derived based on Timoshenko beam theory, resulting in the establishment of the skeleton curve model for the joint. Additionally, the finite element model of the joint was developed to analyze the parameters and fit the unloading stiffness equation of the joint. The nonlinear hysteresis model of the joint was ultimately established by incorporating the hysteresis rule accounting for the pinching effect. The model accurately represented the joint's force-displacement relationship under cyclic loading, thereby providing theoretical support for the application of the joints in medium and high seismic regions.
Keyword ：
Nonlinear force-deformation relationship Nonlinear force-deformation relationship Prefabricated pier-cap beam joint Prefabricated pier-cap beam joint Seismic performance Seismic performance Socket connection Socket connection
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| GB/T 7714 | Zhu, Zhixin , Zhang, Guangda , Han, Qiang et al. Nonlinear hysteretic model of prefabricated pier-cap beam joint with CFST socket connection [J]. | ENGINEERING STRUCTURES , 2025 , 330 . |
| MLA | Zhu, Zhixin et al. "Nonlinear hysteretic model of prefabricated pier-cap beam joint with CFST socket connection" . | ENGINEERING STRUCTURES 330 (2025) . |
| APA | Zhu, Zhixin , Zhang, Guangda , Han, Qiang , Li, Zhipeng , Xu, Li , Du, Xiuli . Nonlinear hysteretic model of prefabricated pier-cap beam joint with CFST socket connection . | ENGINEERING STRUCTURES , 2025 , 330 . |
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Abstract ：
Geopolymer concrete holds immense potential as a viable alternative to ordinary Portland cement (OPC) concrete; however, its application for structures has been hindered by its low compressive strength relative to conventional OPC concrete. This study investigates the utilization of carbon-fiber-reinforced polymer (CFRP) tubes to confine fly-ash-based geopolymer (FAGPR) concrete and its graphene oxide (GO)-modified counterpart (GFAGPR), with the aim of enhancing compressive strength. Experimental investigation reveals significant improvements in mechanical strength. Furthermore, we conducted a life cycle assessment (LCA) to compare the environmental impacts and economic costs of OPC, FAGPR, and GFAGPR-concrete-filled CFRP tube composites, and their concrete-only counterparts, over a 100-year service life. The LCA results indicate that the (G)FAGPR composites exhibit significantly lower CO2 emissions than their OPC-tube counterpart. However, the OPC composite is currently the most economic among all candidates. Additionally, the admixed GO not only mitigates the environmental impacts but also reduces the cost of FAGPR-tube composite, likely because of the GO-enhanced strength of core FAGPR concrete reducing the usage of CFRP tube that features higher cost and higher GWP coefficient.
Keyword ：
CFRP CFRP graphene oxide graphene oxide life-cycle analysis life-cycle analysis nanotechnology nanotechnology resilient infrastructure resilient infrastructure sustainable concrete sustainable concrete
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| GB/T 7714 | Li, Zhipeng , Lei, Zhen , Mislang, Jan Benedict B. et al. Nano-Modified Fly-Ash-Based Geopolymer Concrete Filled Carbon Fiber-Reinforced Polymer Tube Composite: Mechanical Model and Life Cycle Assessment [J]. | TRANSPORTATION RESEARCH RECORD , 2025 , 2679 (7) : 548-564 . |
| MLA | Li, Zhipeng et al. "Nano-Modified Fly-Ash-Based Geopolymer Concrete Filled Carbon Fiber-Reinforced Polymer Tube Composite: Mechanical Model and Life Cycle Assessment" . | TRANSPORTATION RESEARCH RECORD 2679 . 7 (2025) : 548-564 . |
| APA | Li, Zhipeng , Lei, Zhen , Mislang, Jan Benedict B. , Zhang, Guangda , Shi, Xianming . Nano-Modified Fly-Ash-Based Geopolymer Concrete Filled Carbon Fiber-Reinforced Polymer Tube Composite: Mechanical Model and Life Cycle Assessment . | TRANSPORTATION RESEARCH RECORD , 2025 , 2679 (7) , 548-564 . |
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The traditional reinforced concrete canopy using cast-in-place (CIP) technology, is associated with problems such as long construction period, high environmental pollution, and low construction quality. Prefabricated assembly technology, due to its modern and highly industrialized characteristics, provides a promising solution to address the mentioned challenges. In this study, an innovative Ultra High-Performance concrete (UHPC)-filled grouted corrugated duct connection (UGCDC) approach was introduced for prefabricated canopy beam-column joints, considering the structural characteristics of the canopy. To evaluate the seismic behavior of canopy beam-column joints utilizing the UGCDC method, three comprehensive full-scale quasi-static experiments were conducted. Meanwhile, relevant seismic behavior indexes were extracted from the hysteresis curve, and the seismic performance of canopy joints was assessed by analyzing the effects of different research parameters on seismic behavior indicators. In addition, based on the OpenSees platform, a fiber finite element model (FEM) was established that incorporated the bond-slip behavior at the UGCDC joint. The research results indicated that the seismic behavior of canopy beam-column joints using UGCDC is basically consistent with that of CIP joints, and setting a shear key in UGCDC joints can improve ductility by 22.4 %. In terms of bearing capacity, there is not much difference among the three specimens, but in terms of initial stiffness, the specimen using UGCDC and shear key and the specimen using UGCDC have increased by 6.0 % and 9.6 % compared to CIP specimen, respectively. The developed FEM can predict the hysteresis characteristic of canopy joints using UGCDC. UGCDC method is a reliable connection form for canopy beam-column connection joint, which is suitable for medium to high intensity earthquake areas. Finally, a seismic performance assessment method of prefabricated canopy beam-column joints using UGCDC was proposed.
Keyword ：
Beam-column joints Beam-column joints connection connection Prefabricated canopy Prefabricated canopy Seismic performance Seismic performance Simplified fiber model Simplified fiber model UHPC-Filled grouted corrugated ducts UHPC-Filled grouted corrugated ducts
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| GB/T 7714 | Su, Sibo , Zhang, Guangda , Han, Qiang et al. Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 96 . |
| MLA | Su, Sibo et al. "Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection" . | JOURNAL OF BUILDING ENGINEERING 96 (2024) . |
| APA | Su, Sibo , Zhang, Guangda , Han, Qiang , Xu, Li , Zhou, Daxing , Du, Xiuli . Quasi-static tests of full-scale precast canopy beam-column joints with UHPC-filled grouted corrugated ducts connection . | JOURNAL OF BUILDING ENGINEERING , 2024 , 96 . |
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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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