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学者姓名：张超
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Abstract ：
Structures may suffer from accidental impact loads during the service life. While most impacts will not destroy structures completely, quantifying their residual behavior after impact is crucial for evaluating the damage and then providing recommendations for repair or removal. This may greatly reduce the time and economic losses caused by impacts. Hence, this study experimentally and numerically investigated the residual behavior of UHPC-filled high-strength steel tube (UHPC-FHST) members subjected to axial impact. Parameters including impact energy, steel ratio, specimen length, and steel grade (Q690 and Q355) were carefully considered. After tests, different failure modes and axial load-displacement curves were obtained. The residual ratio (β), a ratio of the bearing capacity of a damaged specimen to that of a specimen without impact, was employed to assess the damage level of UHPC-FHST members after axial impact. Tests showed that UHPC-FHST members have excellent axial impact resistance, high residual strength, and high residual ratio, especially under low-energy impact conditions. β decreases rapidly and linearly with increasing nominal strain and then stabilizes after a certain value. A finite element (FE) model was thereafter established and benchmarked by the available test results, where two analysis steps were established to continuously simulate the impact and residual compression processes. The FE results demonstrated a great agreement with the tests, which could provide a reference for further investigations in related studies. © 2024 Elsevier Ltd
Keyword ：
Concretes Concretes High strength steel High strength steel Losses Losses Tubular steel structures Tubular steel structures
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| GB/T 7714 | Yang, Xiaoqiang , Zhang, Zhiqi , Lai, Zhichao et al. Residual behavior of UHPC-filled Q690 high-strength steel tubular members after axial impact [J]. | Engineering Structures , 2024 , 309 . |
| MLA | Yang, Xiaoqiang et al. "Residual behavior of UHPC-filled Q690 high-strength steel tubular members after axial impact" . | Engineering Structures 309 (2024) . |
| APA | Yang, Xiaoqiang , Zhang, Zhiqi , Lai, Zhichao , Chen, Jianqing , Zhang, Chao . Residual behavior of UHPC-filled Q690 high-strength steel tubular members after axial impact . | Engineering Structures , 2024 , 309 . |
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在高压作用下,一些具有无定型相的水泥基粉末材料会发生接触硬化现象,粉末颗粒在压力作用下发生缩聚运动,并在粉末颗粒间形成结构键,进而快速形成具有一定强度及耐水性的人造石材.本文综述了压力作用下水泥基粉末材料接触硬化的成键机理以及粉末水分含量、干燥条件、钙硅比、压制过程对其接触硬化性能影响的研究进展.相关研究结果表明,压力作用下粉末颗粒间会形成氢键、范德华力、固体桥键等结构键;粉末水分含量是影响接触硬化性能的重要因素,在压力作用下,水分可以改变粉末颗粒的表面性质并影响颗粒之间的结合,进而改变压制成品的力学性能;钙硅比对接触硬化性能的影响显著,不同粉末材料在压制时的最佳钙硅比亦是不同;摩擦力的存在降低了压制效率,造成压制成品密度、强度分布不均匀,润滑剂的加入可以有效降低摩擦力的影响;此外,降低压制模具高径比并使用双面压制可有效提升压制成品的质量.
Keyword ：
压制工艺 压制工艺 接触硬化 接触硬化 无定型相 无定型相 水分含量 水分含量 水泥基粉末材料 水泥基粉末材料 结构键 结构键 钙硅比 钙硅比
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| GB/T 7714 | 张超 , 张子龙 , 黄伟 et al. 高压作用下水泥基粉末材料的接触硬化研究综述 [J]. | 材料导报 , 2024 , 38 (16) : 117-125 . |
| MLA | 张超 et al. "高压作用下水泥基粉末材料的接触硬化研究综述" . | 材料导报 38 . 16 (2024) : 117-125 . |
| APA | 张超 , 张子龙 , 黄伟 , 潘阿馨 , 赖志超 , 吴天赐 et al. 高压作用下水泥基粉末材料的接触硬化研究综述 . | 材料导报 , 2024 , 38 (16) , 117-125 . |
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人工模拟地震动是目前开展海洋工程结构抗震分析的主要地震输入分析。强度包络函数是人工模拟地震动的重要参数，决定了地震动的强度非平稳性特性，并对地震动持时起控制作用。目前的地震动强度包络模型均是基于陆域地震动记录统计分析得出，无法准确反应海域地震动的强度特性。因此，基于日本K-Net强震动观测台网的实测地震数据库，分析海域地震动在时域中强度分布特性；提出适用于海域地震动的三段式强度包络模型，回归得到震级M、震中距R及关键参数上升段t_1、强震平稳段t_s、下降段衰减率c（无量纲）的计算表达式；研究震级、震中距对海域地震动强度包络模型的影响规律，并探讨海域地震动与陆域地震动强度包络模型的异同。研究结果表明：海域地震动强度包络模型中关键参数上升段t_1、强震平稳段t_s、下降段衰减率c的取值范围分别为[13～52 s],[12～79 s],[0.037～0.173]；震级对关键参数（t_1、ts、c）的影响要大于震中距；与陆域地震动相比，海域地震动的强度包络模型的下降段衰减率c相差显著，且各关键参数的分布范围更大。
Keyword ：
三段式模型 三段式模型 强度包络模型 强度包络模型 海域地震动 海域地震动 相模湾地区 相模湾地区 衰减关系 衰减关系
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| GB/T 7714 | 张超 , 陈昽 , 武程 et al. 海域地震动强度包络模型研究 [J]. | 防灾减灾工程学报 , 2024 , 44 (03) : 506-517 . |
| MLA | 张超 et al. "海域地震动强度包络模型研究" . | 防灾减灾工程学报 44 . 03 (2024) : 506-517 . |
| APA | 张超 , 陈昽 , 武程 , 杜修力 , 赖志超 , 王丕光 . 海域地震动强度包络模型研究 . | 防灾减灾工程学报 , 2024 , 44 (03) , 506-517 . |
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An increasing number of civil structures are being built near or across earthquake faults, making them more susceptible to severe seismic damage due to the presence of large velocity pulses in near-fault ground motions (NFGMs). Because of limited availability of NFGMs records, synthesized NFGMs are necessary for seismic designing of structures located around near-fault areas. Based on the far-field synthesis of ground motions (GMs), various methods for synthesizing NFGMs by superimposing high-frequency and low-frequency components in the time domain have been developed. However, such techniques suffer from wider variation in the response spectrum between the synthesized NFGMs and the target spectrum. To address this issue, a new approach for synthesizing NFGMs has been proposed. This approach investigates key parameters of the response spectrum for NFGMs based on a comprehensive database. Similarly, the shortcomings in existing NFGM methods have been analyzed by evaluating a couple of criteria for the suitability of the synthesizing method. Two adjustment strategies have been developed to attain consistency in the response spectrum. The spectral characteristics can be maintained during the spectrum adjustment process to overcome limitations of existing methods. Synthesized specimen of NFGMs has been utilized to validate the effectiveness of the proposed approach. © 2024 Elsevier Ltd
Keyword ：
High-frequency components High-frequency components Improved methods Improved methods Near-fault ground motions (NFGMs) Near-fault ground motions (NFGMs) Pulse-like Pulse-like Response spectrum (RS) Response spectrum (RS)
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| GB/T 7714 | Zhang, C. , Wu, C. , Wang, P. et al. Improved methods for synthesizing near-fault ground motions based on specific response spectrum [J]. | Soil Dynamics and Earthquake Engineering , 2024 , 183 . |
| MLA | Zhang, C. et al. "Improved methods for synthesizing near-fault ground motions based on specific response spectrum" . | Soil Dynamics and Earthquake Engineering 183 (2024) . |
| APA | Zhang, C. , Wu, C. , Wang, P. , Li, D. , Lu, J. . Improved methods for synthesizing near-fault ground motions based on specific response spectrum . | Soil Dynamics and Earthquake Engineering , 2024 , 183 . |
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In practice, fiber-reinforced polymer (FRP) materials have been widely used to reinforce structures. A new type of composite member, i.e., high-strength steel-concrete-FRP-concrete (SCFC) composite columns, was proposed by taking advantage of high-strength steel and FRP. Hence, this paper conducted an experimental and numerical study on its eccentric compressive behavior. A total of 11 tests were designed, with main testing parameters including the thickness of GFRP tube (tf), thickness of steel tube (ts), eccentricity (e), yield strength of steel (fy), and compressive strength of concrete (fc′). Results indicated that: (i) the high-strength SCFC member had obvious post-yield strengthening behavior, owing to the confining effect from the FRP tube, and (ii) the member reached peak load when the GFRP tube fractured. A finite element (FE) model was established and benchmarked, and parametric analyses were conducted based on the benchmarked FE model. It was found that: (i) increasing fy, tf or FRP tube diameter-to-width ratio (Df/B) improved the strength but had no significant effect on the initial stiffness; (ii) increasing ts and fc′ increased both the strength and the initial stiffness; (iii) increasing e reduced the strength and the initial stiffness; and (iv) the eccentric compression behavior of the member was similar to that of square concrete-filled steel tube (CFST) when e was high. Finally, equations for estimating the strength of high-strength square SCFC columns under eccentric compression were proposed. © 2024 Elsevier Ltd
Keyword ：
CFST CFST Composite column Composite column Eccentric load Eccentric load FRP FRP High-strength steel High-strength steel P-M curve P-M curve
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| GB/T 7714 | Lai, Z. , Huang, J. , Yang, X. et al. Eccentric compressive behavior and design of high-strength CFST columns with embedded GFRP tubes [J]. | Engineering Structures , 2024 , 320 . |
| MLA | Lai, Z. et al. "Eccentric compressive behavior and design of high-strength CFST columns with embedded GFRP tubes" . | Engineering Structures 320 (2024) . |
| APA | Lai, Z. , Huang, J. , Yang, X. , Yan, J. , Shi, Y. , Zhang, C. . Eccentric compressive behavior and design of high-strength CFST columns with embedded GFRP tubes . | Engineering Structures , 2024 , 320 . |
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The adoption of inclined columns results in inclined beam-column joints (BCJs). Although the behavior of regular BCJs have been widely investigated, researches on the cyclic behavior and shear strength of inclined BCJs are limited, and further investigations are required to ensure seismic safety of the frames adopting inclined columns. In this work, cyclic behavior of inclined BCJs was first experimentally studied by testing 3 exterior BCJ specimens. After that, a finite element model was developed and validated by the experimental results. The model was subsequently used for parametric study to reveal the effects of key parameters on the joint shear strength. In the end, a theoretical model based on the softened strut and tie model was proposed to estimate the joint shear strength of inclined BCJs. Results showed that the inclination caused an initial joint shear force under column axial load, leading to different joint behavior in positive and negative loading directions. The joint shear strength was increased in the inclination direction but declined in the other direction, while the ductility showed an opposite trend. Meanwhile, regardless of the inclination direction, energy dissipation and equivalent viscous damping of BCJs were reduced and stiffness degradation was slowed. The parametric study revealed that the inclination effect was amplified with higher inclinations. The overall joint shear strength can be effectively enhanced by adopting higher concrete strength and column axial load. Increasing the joint stirrup ratio was also beneficial for the shear strength, but its efficiency was relatively lower. Based on the comparison of the predicted joint shear strengths and those from experimental and numerical programs, it was proved that the modified strut and tie model was advantageous over the formulas in GB 50010 in capturing the shear strengths. This work contributes to understanding the cyclic behavior and shear strength of inclined BCJs to improve seismic safety of frames adopting inclined columns.
Keyword ：
Beam-column joint Beam-column joint Finite element analysis Finite element analysis Inclined column Inclined column Reinforced concrete Reinforced concrete Shear strength Shear strength
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| GB/T 7714 | Zhang, Chao , Zhu, Zhan , Wu, Yunfang et al. Cyclic behavior and shear strength of exterior reinforced concrete beam-column joints with inclined columns [J]. | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
| MLA | Zhang, Chao et al. "Cyclic behavior and shear strength of exterior reinforced concrete beam-column joints with inclined columns" . | JOURNAL OF BUILDING ENGINEERING 90 (2024) . |
| APA | Zhang, Chao , Zhu, Zhan , Wu, Yunfang , Shen, Xinyu , Liu, Chengtao , Liu, Kun et al. Cyclic behavior and shear strength of exterior reinforced concrete beam-column joints with inclined columns . | JOURNAL OF BUILDING ENGINEERING , 2024 , 90 . |
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实际工程中混凝土由于自身与外界的作用，体积会发生变化，产生收缩。混凝土的收缩性能研究自从进入人们的视野以来，就不断有新的研究方法被提出。根据约束作用，混凝土收缩一般分为自由收缩和约束收缩，其中，环形约束收缩试验因其装置简单、易操作、应力大小均匀、易于推广及标准化、体现约束条件下收缩和应力松弛的综合作用等优点，被广泛应用于收缩试验，能有效地评价混凝土的抗开裂性能。然而，环形约束收缩试验有着开裂位置随机、对高抗裂性材料约束不足、开裂时间较长或不开裂等问题，对此，许多学者针对诱导裂缝位置与加大开裂敏感度的方面提出了不同的改进装置。另外，试验的影响因素与开裂指标也是关系到环形约束收缩试验方法科学实用与...
Keyword ：
开裂指标 开裂指标 湿度 湿度 环形约束收缩试验 环形约束收缩试验 约束度 约束度 试验装置 试验装置
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| GB/T 7714 | 张超 , 方胜 , 黄伟 et al. 混凝土环形收缩试验的研究进展 [J]. | 材料导报 , 2023 , (04) : 1-21 . |
| MLA | 张超 et al. "混凝土环形收缩试验的研究进展" . | 材料导报 04 (2023) : 1-21 . |
| APA | 张超 , 方胜 , 黄伟 , 赖志超 , 陈添平 . 混凝土环形收缩试验的研究进展 . | 材料导报 , 2023 , (04) , 1-21 . |
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This paper presents the dynamic response analyses of a special long-span cable-stayed bridge with the main span length of 680 (m) subjected to pulse-type ground motions. The 1/100 scaled shaking table test are developed herein to verify the accuracy and correctness of the 3D finite element (FE) model of the examined long-span cable-stayed bridge on the software platform of SAP2000. To systematically investigate the influence on the seismic responses and on the selection of the nonlinear viscous damper parameters of the employed long-span cable-stayed bridge both the near-fault pulse-type ground motions and the far-field ground motions are selected as the seismic inputs of FE model. Some important conclusions are drawn that the near-fault ground motions usually causes the larger peak responses (e.g., Tower top displacement, girder end displacement, and moment of tower bottom) of the long-span cable-stayed bridge compared with the far-field motions, namely the near-fault ground motions are more destructive to the structures. The displacement responses can be amplified approximately 2-3 times and the damper parameters (Damping coefficient C and damping index alpha) of nonlinear viscous dampers can be affected by the ground motion characteristics. The damper parameter values are changed from the C = 3000 and alpha = 0.3 in far-field earthquakes to the C = 6000 and alpha = 0.2 in near-fault earthquakes, namely the near-fault ground motions obviously increase the demand of energy consumption of general nonlinear viscous dampers.
Keyword ：
Long-span cable-stayed bridge Long-span cable-stayed bridge Pulse-type ground motion Pulse-type ground motion Seismic response Seismic response Shaking table test Shaking table test Structure analysis Structure analysis
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| GB/T 7714 | Jia, Hongyu , Liu, Zhi , Xu, Li et al. Dynamic response analyses of long-span cable-stayed bridges subjected to pulse-type ground motions [J]. | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2023 , 164 . |
| MLA | Jia, Hongyu et al. "Dynamic response analyses of long-span cable-stayed bridges subjected to pulse-type ground motions" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 164 (2023) . |
| APA | Jia, Hongyu , Liu, Zhi , Xu, Li , Bai, Hao , Bi, Kaiming , Zhang, Chao et al. Dynamic response analyses of long-span cable-stayed bridges subjected to pulse-type ground motions . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2023 , 164 . |
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In the current engineering practice,the volume of concrete is usually changed causing the formation of shrinkage due to the internal and external actions. Since recent research focusing on the shrinkage properties of concrete emerged,new research methods have continuously been proposed. The shrinkage of concrete is generally divided into free and confined shrinkage according to the limitation actions. One of the recent adopted testing methods is the ring confined shrinkage test that is widely used in testing the shrinkage of concrete. The wide usage of this method is due to its advantages that include the simple devices,easy operation,uniform stress,and easy popularization and standardization. It can also reflect the comprehensive effects of shrinkage and stress relaxation under constraint conditions. Therefore,it has the ability to effectively examine the cracking resistance of concrete. However,this testing method has some drawbacks such as the random cracking position,insufficient restraint on materials with high cracking, and long cracking time or no cracking. Thus,many scholars have suggested different improved devices that can induce cracks position and increase the cracking sensitivity. Besides,the influencing factors and cracking indicators of this testing method are also important for the scientific and practical application. For methods improvement,many studies conducted recently either locally or abroad have proposed new practical methods such as built-in sharp angle,inner and outer rings eccentricity,and elliptical rings. Several factors such as the constraint degree,humidity,fiber,etc.,have an important influence on this testing method,while there are some practical cracking indexes based on tensile strength,fracturing mechanics, cracking coefficient,stress rate coefficient,etc.,for the cracking indicators. This review summarizes the available research on the progress of concrete ring confined shrinkage test,from a detailed and comprehensive perspective of the experimental devices,influential factors and cracking indicators. Still,it provides analysis on the influencing factors of this testing method in order to serve as a reference for the future researchers when dealing with this method of testing. © 2023 Cailiao Daobaoshe/Materials Review. All rights reserved.
Keyword ：
Concretes Concretes Concrete testing Concrete testing Shrinkage Shrinkage Stress relaxation Stress relaxation Tensile strength Tensile strength Tensile testing Tensile testing
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| GB/T 7714 | Zhang, Chao , Fang, Sheng , Huang, Wei et al. Ring Shrinkage Test of Concrete:a Review [J]. | Materials Reports , 2023 , 37 (4) . |
| MLA | Zhang, Chao et al. "Ring Shrinkage Test of Concrete:a Review" . | Materials Reports 37 . 4 (2023) . |
| APA | Zhang, Chao , Fang, Sheng , Huang, Wei , Lai, Zhichao , Chen, Tianping . Ring Shrinkage Test of Concrete:a Review . | Materials Reports , 2023 , 37 (4) . |
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In this study, a numerical model for the seawater-sediment-bedrock system is proposed to evaluate the seismic responses of ocean sites under obliquely incident P-SV wsaves. First, the stiffness matrix method for the soil medium with an arbitrary angle input of seismic waves is extended to evaluate the seismic responses of the seawater-sediment-bedrock system. The wave radiation effects of the far-field domain are fully considered by the exact artificial boundary conditions. Second, the proposed model is verified by degenerated models and a nu-merical model developed by the authors, which are inapplicable to arbitrary-angle inputs of seismic waves. Third, the effects of site properties, including the porosity and permeability of the seabed, incident angle and depth of seawater, on the peak response of the sediment layer under obliquely incident P and SV waves are analysed. The results are conducive to understanding the seismic responses of ocean sites.
Keyword ：
Obliquely incident Obliquely incident Seawater-sediment-bedrock system Seawater-sediment-bedrock system Seismic response Seismic response Stiffness matrix method Stiffness matrix method
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| GB/T 7714 | Zhao, Mi , Hu, Songmin , Wang, Piguang et al. Analysis of seawater-sediment-bedrock interaction model under obliquely incident P-SV waves with arbitrary angles [J]. | APPLIED OCEAN RESEARCH , 2023 , 130 . |
| MLA | Zhao, Mi et al. "Analysis of seawater-sediment-bedrock interaction model under obliquely incident P-SV waves with arbitrary angles" . | APPLIED OCEAN RESEARCH 130 (2023) . |
| APA | Zhao, Mi , Hu, Songmin , Wang, Piguang , Zhang, Chao , Zhang, Guoliang , Du, Xiuli . Analysis of seawater-sediment-bedrock interaction model under obliquely incident P-SV waves with arbitrary angles . | APPLIED OCEAN RESEARCH , 2023 , 130 . |
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