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学者姓名：吴兆旗
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Abstract ：
This paper uses ABAQUS software to perform finite element simulation on eccentric compression member of corroded circular steel tubes strengthened by FRP tube grouting. The working mechanisms, failure mode and the lifting of mechanical properties are investigated. The results show that the load-displacement curve of the member represents both bilinear and trilinear models. The former is in the overall buckling failure mode, while the latter is in the strength failure mode of the circular steel tube with bare ends. After strengthening, the bearing capacity increases by up to 114.99%. Moreover, the increase positively correlates with corrosion rate, grouting thickness, and FRP tube thickness. It first decreases before increasing as the slenderness ratio changes, while the concrete strength has little effect. At the same time, the bound flexural stiffness ratio is derived and provides reference suggestions for the practical engineering application of FRP tube grouting to strengthen corroded steel structures.
Keyword ：
Bound flexural stiffness ratio Bound flexural stiffness ratio Corrosion rate Corrosion rate Finite element analysis Finite element analysis FRP tube grouting FRP tube grouting Mechanical performance lifting Mechanical performance lifting
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| GB/T 7714 | Fu, Hao , Zhao, Huanhuan , Pan, Zhiyong et al. Behaviour of corroded circular steel tube strengthened with external FRP tube grouting under eccentric loading: Numerical study [J]. | STRUCTURES , 2023 , 56 . |
| MLA | Fu, Hao et al. "Behaviour of corroded circular steel tube strengthened with external FRP tube grouting under eccentric loading: Numerical study" . | STRUCTURES 56 (2023) . |
| APA | Fu, Hao , Zhao, Huanhuan , Pan, Zhiyong , Wu, Zhaoqi , Chin, Chee-Loong , Ma, Chau-Khun . Behaviour of corroded circular steel tube strengthened with external FRP tube grouting under eccentric loading: Numerical study . | STRUCTURES , 2023 , 56 . |
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The behavior of Shallow Steel-beam-Concrete Composite (SSCC) decks, made of steel beam connected to concrete, is the object of this study. Emphasis is placed on the effect that different Steel-beam-Concrete (SC) bonding measures and techniques have on the composite action. An extensive review of several experimental tests showed that the SC bonding force consists of two components: one deriving from the direct steel-concrete adhesion in the compression zone and one dependent on the adopted SC bonding technique. The effectiveness of such SC bonding techniques, which varies from negligible to full composite action (FCA), has been assessed by comparing the experimental tests with numerical simulations having FCA. The closer the test result to the FCA result, the more effective the adopted SC bonding technique. Analytical equations for the bending capacity at yield and ultimate of SSCC decks with FCA have been developed, meant to be adopted in design.
Keyword ：
Composite action Composite action Composite slim floor beam Composite slim floor beam Flexural capacity Flexural capacity Shallow Steel-Beam-Concrete Composite decks Shallow Steel-Beam-Concrete Composite decks Shear connections Shear connections Web openings Web openings
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| GB/T 7714 | Lin, Zhou , Monti, Giorgio , Wu, Zhao-qi . Composite action in Shallow Steel-beam-Concrete Composite decks [J]. | ENGINEERING STRUCTURES , 2023 , 286 . |
| MLA | Lin, Zhou et al. "Composite action in Shallow Steel-beam-Concrete Composite decks" . | ENGINEERING STRUCTURES 286 (2023) . |
| APA | Lin, Zhou , Monti, Giorgio , Wu, Zhao-qi . Composite action in Shallow Steel-beam-Concrete Composite decks . | ENGINEERING STRUCTURES , 2023 , 286 . |
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Abstract ：
本实用新型涉及一种便于维护的输电铁塔塔脚构造，包括输电塔的主材角钢、斜材角钢以及设置于主材角钢下部的塔脚结构，塔脚结构包括塔脚底板以及设置在塔脚底板上的塔脚主靴板结构，主材角钢与塔脚主靴板结构上部之间、斜材角钢与塔脚主靴板结构侧部之间经多个连接螺栓连接，塔脚底板上设有多个用以将塔脚结构固定于地面基础上的地脚螺栓，地脚螺栓外部设有混凝土保护帽，用以将位于斜材角钢下方的塔脚结构下部包裹起来。本实用新型结构简单，设计巧妙，使用方便，通过合理设置减少主材角钢、斜材角钢的锈蚀，从而免于更换，同时塔脚主靴板结构与主材角钢、斜材角钢之间经连接螺栓连接，且该连接处靠近地面基础，更换维护十分方便。
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| GB/T 7714 | 韩纪层 , 林德源 , 洪毅成 et al. 一种便于维护的输电铁塔塔脚构造 : CN202223134802.0[P]. | 2022-11-25 00:00:00 . |
| MLA | 韩纪层 et al. "一种便于维护的输电铁塔塔脚构造" : CN202223134802.0. | 2022-11-25 00:00:00 . |
| APA | 韩纪层 , 林德源 , 洪毅成 , 吴兆旗 , 夏晓健 , 严康骅 et al. 一种便于维护的输电铁塔塔脚构造 : CN202223134802.0. | 2022-11-25 00:00:00 . |
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In this paper, ABAQUS software is used to carry out finite element simulation on the axial compression per-formance of corroded round steel pipe members reinforced by FRP casing grouting. Moreover, its working mechanism and failure mode are analyzed. A typical load-displacement curve of the component is obtained. Furthermore, the effect of FRP pipe thickness, grouting thickness, corrosion rate, concrete strength, and slen-derness ratio on the mechanical performance of the component is explored. The research results indicate that the component load-displacement curve can be characterized by bilinear and trilinear models. The former corre-sponds to the overall buckling failure mode, while the latter corresponds to the strength failure mode for the bare ends of a round steel tube. After reinforcement, the component bearing capacity increases up to 166.83%. Moreover, the increase is positively correlated with FRP pipe thickness, grouting thickness, and corrosion rate. The component bearing capacity first decreases and then increases when modifying the slenderness ratio, while concrete strength has a minor effect on it. Moreover, the bending stiffness ratio equation and the stability bearing capacity correction equation of the axial compression reinforced components are proposed. The aforementioned provides reference suggestions for practical engineering applications of corroded steel structures reinforced by FRP casing grouting.
Keyword ：
Corroded round steel pipe Corroded round steel pipe Finite element analysis Finite element analysis FRP casing grouting FRP casing grouting Limit bending stiffness ratio Limit bending stiffness ratio Mechanical performance improvement Mechanical performance improvement
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| GB/T 7714 | Fu, Hao , Zhang, Jiayi , Wu, Zhaoqi et al. Nonlinear analysis of axial-compressed corroded circular steel pipes reinforced by FRP-casing grouting [J]. | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 201 . |
| MLA | Fu, Hao et al. "Nonlinear analysis of axial-compressed corroded circular steel pipes reinforced by FRP-casing grouting" . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH 201 (2022) . |
| APA | Fu, Hao , Zhang, Jiayi , Wu, Zhaoqi , Chin, Chee-Loong , Ma, Chau-Khun . Nonlinear analysis of axial-compressed corroded circular steel pipes reinforced by FRP-casing grouting . | JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH , 2022 , 201 . |
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In order to achieve a comprehensive and accurate evaluation of the safety of compression members made of circular steel tubes, image processing technology is commonly utilized to extract the morphology of the steel tubes before and after rust removal. The obtained results have validated the feasibility and applicability of employing digital cameras and image processing technology to analyze the images of the steel tubes before and after rust removal and to extract useful structural mechanics features. The feature values of the apparent morphology before rust removal grow with the increase of the corrosion depth, while after rust removal, the feature values first increase and then decrease with the growth of the corrosion depth. Based on this fact, a simplified equation is proposed to quantify the relationship between the feature values of the apparent morphology before and after rust removal and the corrosion depth. In continuing, a simple, fairly accurate, and comprehensive safety evaluation methodology for corroded circular steel tubes under compression is established. Finally, an example is illustrated to check the applicability and effectiveness of the proposed approach.
Keyword ：
comprehensive evaluation method comprehensive evaluation method corroded circular steel tubes (CCSTs) corroded circular steel tubes (CCSTs) feature value extraction feature value extraction image processing image processing safety evaluation safety evaluation
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| GB/T 7714 | Wei, Yuan , Li, Yingjie , Wu, Zhaoqi et al. Comprehensive Safety Evaluation of Corroded Circular Steel Tubes under Compression Based on Image Processing [J]. | COATINGS , 2022 , 12 (11) . |
| MLA | Wei, Yuan et al. "Comprehensive Safety Evaluation of Corroded Circular Steel Tubes under Compression Based on Image Processing" . | COATINGS 12 . 11 (2022) . |
| APA | Wei, Yuan , Li, Yingjie , Wu, Zhaoqi , Chen, Jinyu , Jiang, Shao-Fei , Lin, Deyuan et al. Comprehensive Safety Evaluation of Corroded Circular Steel Tubes under Compression Based on Image Processing . | COATINGS , 2022 , 12 (11) . |
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There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3dp. The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth.
Keyword ：
horizontal bearing capacity horizontal bearing capacity numerical simulation numerical simulation offshore wind farm offshore wind farm parametric analysis parametric analysis rock-socketed piles rock-socketed piles
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| GB/T 7714 | Zhaoqi Wu , Xingcheng Zhang , Qiming Song et al. Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines [J]. | Journal of Physics:Conference Series , 2022 , 2280 (1) . |
| MLA | Zhaoqi Wu et al. "Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines" . | Journal of Physics:Conference Series 2280 . 1 (2022) . |
| APA | Zhaoqi Wu , Xingcheng Zhang , Qiming Song , Wei Liu , Zhibing Chen . Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines . | Journal of Physics:Conference Series , 2022 , 2280 (1) . |
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通过收集整理大量国内外灌浆连接轴向力学性能试验数据,得到包含115个有效试验数据的数据库.依据各国规范公式中的参数对数据进行分类,分析灌浆连接轴向力学性能试验研究现状.在此基础上,对DNV-GL(2018)、NORSOK(2013)、API(2007)、ISO(2007)、HSE(2001)等规范设计公式进行安全性分析.结果表明:现有试验研究中超过50％的试件套管直径低于400 mm,且对于试件套管直径超过800 mm的研究仅有一项;灌浆厚度的选择大部分不符合主要规范使用范围,且主要集中于低灌浆厚度;灌浆材料抗压强度的选择大部分为低抗压强度,虽满足大部分规范公式适用范围,但不利于实际工程实践运用;通过对比分析各国规范设计公式试验平均安全系数及其标准差,表明DNV-GL(2018)设计规范公式安全性高、适用性广与经济性好,推荐海上风电结构灌浆设计优先考虑采用DNV-GL(2018)规范.
Keyword ：
参数影响 参数影响 安全性 安全性 数据库 数据库 灌浆连接 灌浆连接 规范公式 规范公式
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| GB/T 7714 | 吴兆旗 , 游先辉 , 王根梁 et al. 基于试验数据库的灌浆连接规范公式安全性评估 [J]. | 福州大学学报（自然科学版） , 2022 , 50 (1) : 120-125 . |
| MLA | 吴兆旗 et al. "基于试验数据库的灌浆连接规范公式安全性评估" . | 福州大学学报（自然科学版） 50 . 1 (2022) : 120-125 . |
| APA | 吴兆旗 , 游先辉 , 王根梁 , 单宁康 . 基于试验数据库的灌浆连接规范公式安全性评估 . | 福州大学学报（自然科学版） , 2022 , 50 (1) , 120-125 . |
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Abstract ：
There is no standard for rock-socketed pile foundation of offshore wind farm at China and abroad. According to the practical geological and environmental conditions of offshore wind power plant, response of rock-socketed pile under horizontal load was analyzed by using a finite element software, ABAQUS. Then, the parameters of rock-socketed pile, i.e. depth, pile diameter, ratio of pile diameter to thickness, and grouting thickness were investigated by orthogonal analysis and parametric analysis. It is found that the thickness of grouting has little influence on the displacement of pile head. The diameter and the ration of diameter to thickness of pile, rock-socketed depth have significant influence. The displacement of pile tip tends to stable and the bending moment at bottom of pile become zero when the rock-socketed depth reaches 3dp. The maximum Tresca stress of grouting body and 1st principal stress of rock mass decrease with an increase of rock-socketed depth. © Published under licence by IOP Publishing Ltd.
Keyword ：
ABAQUS ABAQUS Bearing capacity Bearing capacity Concrete construction Concrete construction Electric utilities Electric utilities Grouting Grouting Mortar Mortar Offshore oil well production Offshore oil well production Offshore wind farms Offshore wind farms Offshore wind turbines Offshore wind turbines Pile foundations Pile foundations Piles Piles Rocks Rocks
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| GB/T 7714 | Wu, Zhaoqi , Zhang, Xingcheng , Song, Qiming et al. Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines [C] . 2022 . |
| MLA | Wu, Zhaoqi et al. "Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines" . (2022) . |
| APA | Wu, Zhaoqi , Zhang, Xingcheng , Song, Qiming , Liu, Wei , Chen, Zhibing . Numerical analysis of horizontal bearing capacity of large-diameter implanted rock-socketed piles for offshore wind turbines . (2022) . |
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为了解近海大气环境下腐蚀程度对Q235钢材屈服强度、抗拉强度、弹性模量和断后伸长率等力学性能的影响规律,采用加速腐蚀试验和钢材拉伸试验相结合的方法,开展了腐蚀Q235钢材试验研究,同时收集并结合已有腐蚀钢材力学性能试验结果,建立起腐蚀钢材力学性能与腐蚀程度计算公式,并基于幂函数模型建立起腐蚀钢材力学性能时变模型,分析了不同地区和不同厚度下钢材力学性能随时间的退化规律.结果表明,腐蚀钢材屈服阶段和软化阶段均逐渐变短,钢材颈缩现象明显减弱,钢材断裂逐渐由延性断裂转变为脆性断裂;腐蚀钢材力学性能均随着腐蚀率的增大整体呈现线性下降趋势,其中断后伸长率相较于其它力学性能下降最快;所建立腐蚀钢材力学性能与腐蚀率计算公式的数据量更大,更具有代表性;钢材在沿海城市受腐蚀影响较大,使用50年后最严重地区钢材力学性能下降达到20％,而在内陆城市则一般不超过6％;相同腐蚀年限下,腐蚀钢材力学性能退化程度随着钢材厚度的减小而越发显著.
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| GB/T 7714 | 魏源 , 吴兆旗 , 王鑫涛 et al. 近海大气环境下腐蚀Q235钢材力学性能退化规律及时变模型研究 [J]. | 水利与建筑工程学报 , 2021 , 19 (4) : 60-66 . |
| MLA | 魏源 et al. "近海大气环境下腐蚀Q235钢材力学性能退化规律及时变模型研究" . | 水利与建筑工程学报 19 . 4 (2021) : 60-66 . |
| APA | 魏源 , 吴兆旗 , 王鑫涛 , 姜绍飞 . 近海大气环境下腐蚀Q235钢材力学性能退化规律及时变模型研究 . | 水利与建筑工程学报 , 2021 , 19 (4) , 60-66 . |
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为了研究海上风机基础中灌浆连接存在水平偏心时不同尺寸模型轴向承载性能的差异,分别对具有相同偏心率的足尺模型和缩尺模型进行轴压试验研究.试验通过对称布置位移计、应变片和应变计,记录了试件产生的位移、应变、声响、丧失承载力过程及破坏模式,得到试件荷载位移曲线、剪力键附近灌浆内部应变与钢管壁应变等重要试验特征参数,结合数值模拟和统计分析方法对试验结果进行了详细分析.研究发现,存在水平偏心时,灌浆区较薄处应变值及其发展速度高于较厚处;缩尺试件试验抗剪强度与设计抗剪强度之比为1.47;足尺试件试验抗剪强度与设计抗剪强度之比为1.06.对比发现缩尺试件试验结果与规范计算结果相差较大,而足尺试件试验结果与规范计算结果较为接近,通过统计28个国内外文献试验,发现随着尺寸的增大,试验结果趋近于规范公式计算结果.
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| GB/T 7714 | 吴兆旗 , 游先辉 , 单宁康 et al. 考虑偏心的不同尺寸灌浆连接轴向承载性能 [J]. | 广西大学学报（自然科学版） , 2021 , 46 (4) : 854-865 . |
| MLA | 吴兆旗 et al. "考虑偏心的不同尺寸灌浆连接轴向承载性能" . | 广西大学学报（自然科学版） 46 . 4 (2021) : 854-865 . |
| APA | 吴兆旗 , 游先辉 , 单宁康 , 王根梁 , 李孟超 , 钟茗秋 . 考虑偏心的不同尺寸灌浆连接轴向承载性能 . | 广西大学学报（自然科学版） , 2021 , 46 (4) , 854-865 . |
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