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学者姓名：张超
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Abstract ：
Engineered cementitious composite (ECC) possesses excellent ductility resulting from the presence of organic fiber, however, the ECC exhibits a significant shrinkage performance, which is likely to induce cracking under the constrained condition in practical engineering. In this paper, the effect of fiber on the shrinkage behavior of ECC was investigated based on the steel ring with different constraints, and the cracking risks of ECC under constraints were discussed. The experimental results show that increasing fiber content and length in ECC are conducive to the splitting tensile strength, the 28 days strength are improved by 36 % and 16 % as the content and length of PVA fiber are increased from 0 % to 2 % and 6 mm to 12 mm, respectively. And the addition of PE fiber is helpful to the strength development, the strength is about 15 % higher than those with PP and PVA fiber. Under the uniform constraint, the fiber content has a significant impact on the shrinkage development of ECC, and the cracking is observed in the specimens with insufficient fiber content. However, the cracking is likely to be induced in the case of non-uniform constraint, and the reduction of fiber content and length accelerates the cracking age while the introduction of PVA fiber delays the cracking, the cracking age of ECC with 2 % PVA fiber content is 28.2 d, being later than those of ECC with PP and PE fiber, which is related to the moderate limited elongation and rough surface. Due to the ECC ductility and constraint, the traditional cracking risk criterion Theta CR is not suitable for the ECC under uniform constraint, Additionally, although the proposed eta is suitable for the cracking risk evaluation of ECC under non-uniform constraint, the cracking tendency is still not able to be predicted. Therefore, the constraint condition and material properties should be considered in the evaluation of ECC cracking risk.
Keyword ：
Cracking risk assessment Cracking risk assessment ECC ECC Fiber Fiber Ring constrained shrinkage Ring constrained shrinkage Splitting tensile strength Splitting tensile strength
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| GB/T 7714 | Huang, Wei , Deng, Xuhui , Li, Shaowei et al. Investigation on the effect of fiber on the constrained shrinkage performance of engineering cementitious composite (ECC) [J]. | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 458 . |
| MLA | Huang, Wei et al. "Investigation on the effect of fiber on the constrained shrinkage performance of engineering cementitious composite (ECC)" . | CONSTRUCTION AND BUILDING MATERIALS 458 (2025) . |
| APA | Huang, Wei , Deng, Xuhui , Li, Shaowei , Zhang, Zilong , He, Lian , Liu, Feifan et al. Investigation on the effect of fiber on the constrained shrinkage performance of engineering cementitious composite (ECC) . | CONSTRUCTION AND BUILDING MATERIALS , 2025 , 458 . |
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Post-earthquake investigations show that bridges with double/multi-columns could suffer serious damage characterized as significant residual deformation. To improve the seismic resilience of the double-column bridge bent under strong earthquakes, a novel self-centering energy dissipation brace composed of deformationamplified shape memory alloy wires and a friction device (DASMAFD) is employed to retrofit the bridge bent. Employing the lateral deformation as the damage index, the direct displacement-based design procedure of bridge bents retrofitted with DASMAFDs is proposed and then examined by elastic-plastic time history analysis. To assess the seismic performance of the retrofitted bridge bent under earthquakes with different intensities, the fragility analysis of the retrofitted bridge bent under near-fault and far-field ground motions is conducted. For comparison, the bridge bents with shape memory alloy-friction damper (SMAFD) and displacement-amplified shape memory alloy damper (DASMAD) are also investigated. Meanwhile, the ratio of residual displacement to peak displacement is defined as the residual displacement factor and used to assess the self-centering function of bridge bents. The results show that the double-column bridge bent retrofitted with DASMAFDs has significant seismic resilience characterized as the lowest vulnerability and insignificant residual deformation under earthquakes with different intensities.
Keyword ：
Displacement amplification Displacement amplification Double-column bridge bents Double-column bridge bents Fragility analysis Fragility analysis Performance-based seismic design Performance-based seismic design Self-centering performance Self-centering performance Shape memory alloy-friction damper Shape memory alloy-friction damper
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| GB/T 7714 | Gao, Xinxin , Zhang, Zhenhua , Zhang, Chao . Performance-based seismic design and assessment of double-column bridge bent retrofitted with a novel shape memory alloy-friction brace [J]. | STRUCTURES , 2025 , 73 . |
| MLA | Gao, Xinxin et al. "Performance-based seismic design and assessment of double-column bridge bent retrofitted with a novel shape memory alloy-friction brace" . | STRUCTURES 73 (2025) . |
| APA | Gao, Xinxin , Zhang, Zhenhua , Zhang, Chao . Performance-based seismic design and assessment of double-column bridge bent retrofitted with a novel shape memory alloy-friction brace . | STRUCTURES , 2025 , 73 . |
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The adoption of diamond-shaped pylons leads to double-inclined beam-column joints (BCJs), whose seismic behavior and shear strengths have not been studied. In this work, one regular and three double-inclined BCJs were tested to investigate the effects of column inclination and column axial load level on the seismic behavior of BCJs. Besides, parametric analysis based on a finite element model was also conducted to further reveal the effects of key parameters on the joint shear strengths of double-inclined BCJs. Results indicated that the column inclination led to initial stress on the column and joint core, accelerating the joint cracking and damage development. Compared to the regular BCJ, the inclined BCJ showed reduced loading capacity, joint shear strength, ductility, and viscous damping. Furthermore, the behavior of double-inclined BCJs was evidently affected by the column axial load. A higher column axial load could change the failure mode from joint shear to mixed joint shear and column flexure, leading to improved loading capacity, ductility, energy dissipation, and joint shear strength. Meanwhile, the joint shear strengths of the inclined BCJs were effectively improved by adopting higher concrete strength, while the benefits of increasing the joint stirrup ratio were relatively limited.
Keyword ：
beam-column joint beam-column joint bridge pylons bridge pylons cyclic load cyclic load finite element finite element shear strength shear strength
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| GB/T 7714 | Shen, Xinyu , Zhang, Chao , Liu, Kun et al. Experimental and numerical study on seismic behavior of double-inclined reinforced concrete beam-column joints [J]. | STRUCTURAL CONCRETE , 2025 . |
| MLA | Shen, Xinyu et al. "Experimental and numerical study on seismic behavior of double-inclined reinforced concrete beam-column joints" . | STRUCTURAL CONCRETE (2025) . |
| APA | Shen, Xinyu , Zhang, Chao , Liu, Kun , Zhu, Zhan , Liu, Chengtao . Experimental and numerical study on seismic behavior of double-inclined reinforced concrete beam-column joints . | STRUCTURAL CONCRETE , 2025 . |
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在结构动力冲击响应分析中,通常采用动力放大系数(DAF)简化计算结构的动力响应.但是,目前工程结构中对DAF的取值还存在争议.针对此问题,本文推导了多自由度(MDOF)体系的DAF解析表达式,分析了DAF大于2.0的前提条件;分别通过单自由度(SDOF)体系和MDOF体系算例模型验证了解析表达式的准确性,解释了MDOF体系的DAF大于2.0的原因.基于所提出的DAF解析表达式分析了张弦梁剩余结构在断索冲击作用下的DAF分布规律.分析结果表明:当某一阶模态振型的分量与静力响应值反向时,张弦梁的DAF可能会大于 2.0;即使在有阻尼情况下,张弦梁的DAF也可能会大于2.0.
Keyword ：
动力放大系数 动力放大系数 多自由度体系 多自由度体系 张弦梁 张弦梁 断索冲击 断索冲击
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| GB/T 7714 | 张超 , 周桢干 , 赖志超 et al. 多自由度体系的动力放大系数解析研究 [J]. | 振动工程学报 , 2025 , 38 (3) : 550-557 . |
| MLA | 张超 et al. "多自由度体系的动力放大系数解析研究" . | 振动工程学报 38 . 3 (2025) : 550-557 . |
| APA | 张超 , 周桢干 , 赖志超 , 付馨迪 , 杨晓强 . 多自由度体系的动力放大系数解析研究 . | 振动工程学报 , 2025 , 38 (3) , 550-557 . |
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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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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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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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Abstract ：
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.
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, Chao , Wu, Cheng , Wang, Piguang 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, Chao et al. "Improved methods for synthesizing near-fault ground motions based on specific response spectrum" . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 183 (2024) . |
| APA | Zhang, Chao , Wu, Cheng , Wang, Piguang , Li, Dong , Lu, Jianbin . Improved methods for synthesizing near-fault ground motions based on specific response spectrum . | SOIL DYNAMICS AND EARTHQUAKE ENGINEERING , 2024 , 183 . |
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Under high pressure,some cement-based material powders with amorphous phase will undergo contact hardening,poly-condensation movement was occurred under pressure,and structural bond with certain strength will be formed between the powder particles,so as to quickly obtain artificial stone with certain strength and water resistance. In this paper,the bonding mechanism of cement-based material powder contact hardening under pressure and the effects of powder moisture content,drying conditions,calcium silicon ratio and pressing process on contact hardening performance are reviewed. Related research results show that hydrogen bonds,van der Waals forces,solid bridge bonds and other structural bonds are formed between powder particles under pressure. The moisture content of powder is an important factor affecting the contact hardening performance. Under pressure,the moisture can change the surface properties of powder particles and affect the bonding between particles,thereby influencing the mechanical properties of compaction products. The effect of calcium silicon ratio has a significant effect on the contact hardening properties,and the optimum calcium silicon ratio for different powder materials under pressing is also different. The existence of friction reduces the compaction efficiency,resulting in uneven distribution of density and strength of compacted products. The addition of lubricant can effectively reduce the influence of friction. In addition,reducing the height-diameter ratio of pressing die and using double-sided pressing can effectively improve the quality of the compaction products. © 2024 Cailiao Daobaoshe/ Materials Review. All rights reserved.
Keyword ：
amorphous phase amorphous phase calcium silicon ratio calcium silicon ratio cement-based powder material cement-based powder material compacting technology compacting technology contact hardening contact hardening moisture content moisture content structural bond structural bond
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| GB/T 7714 | Zhang, C. , Zhang, Z. , Huang, W. et al. Review on the Contact Hardening Performance of Cement-based Powder Materials Under High Pressure; [高压作用下水泥基粉末材料的接触硬化研究综述] [J]. | Materials Reports , 2024 , 38 (16) . |
| MLA | Zhang, C. et al. "Review on the Contact Hardening Performance of Cement-based Powder Materials Under High Pressure; [高压作用下水泥基粉末材料的接触硬化研究综述]" . | Materials Reports 38 . 16 (2024) . |
| APA | Zhang, C. , Zhang, Z. , Huang, W. , Pan, A. , Lai, Z. , Wu, T. et al. Review on the Contact Hardening Performance of Cement-based Powder Materials Under High Pressure; [高压作用下水泥基粉末材料的接触硬化研究综述] . | Materials Reports , 2024 , 38 (16) . |
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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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