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学者姓名：杨晓强
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Abstract ：
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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Concrete filled steel tube (CFST) column is widely applied in shear frame structure in seismic-prone area owing to its superior earthquake resistant performance. However, CFST column might still suffer damage under a severe earthquake. This paper proposes a novel tuned-mass type column-in-column (CIC) system to improve the seismic behavior of the CFST column and hence protect the structure. The CIC system is formed by splitting the CFST column into a primary column and a secondary column, while the overall cross section area and hence the load- bearing capacity is not changed. By optimally selecting the springs and dashpots to interconnect the two columns, the CIC can act as a non-conventional tuned mass damper (TMD) to reduce seismic vibrations of structures. To demonstrate the proposed CIC concept, a single-story and a five-story frame structure with and without control are designed. Nonlinear time history analyses are performed to study the seismic responses of these structures considering different seismic design levels, earthquake ground motions and CIC control schemes. Numerical results show that the CIC system can effectively reduce the seismic induced story acceleration, displacement and drift ratio of frame structures with the reduction ratios approximately between 21 % and 30 %, and the ratios on reducing the base shear force and bending moment are between 27 % and 31 %, and between 34 % and 49 %, respectively. The proposed CIC control concept is a new solution for mitigations of seismic responses of CFST frame structures.
Keyword ：
CFST frame structure CFST frame structure Column-in-column Column-in-column FE modelling FE modelling Seismic response analysis Seismic response analysis Vibration control Vibration control
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| GB/T 7714 | Fang, Xiaojun , Hao, Hong , Bi, Kaiming et al. Seismic response control of shear frame structure using a novel tuned-mass type composite column [J]. | ENGINEERING STRUCTURES , 2025 , 322 . |
| MLA | Fang, Xiaojun et al. "Seismic response control of shear frame structure using a novel tuned-mass type composite column" . | ENGINEERING STRUCTURES 322 (2025) . |
| APA | Fang, Xiaojun , Hao, Hong , Bi, Kaiming , Ding, Hao , Yang, Xiaoqiang , Song, Jian et al. Seismic response control of shear frame structure using a novel tuned-mass type composite column . | ENGINEERING STRUCTURES , 2025 , 322 . |
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Replaceable coupling beams (RCBs) have gained great attentions in enhancing seismic performances of coupled shear wall (CSW) structures, showing superior advantages over the conventional reinforced concrete (RC) coupling beams. Recently, the authors proposed using the lead viscoelastic damper as a replaceable fuse to fabricate a new RCB, i.e., the lead viscoelastic coupling beam (LVCB). The hysteretic behaviors of this fuse were experimentally and numerically investigated, but the performance of using LVCB in controlling the seismic response of CSW structure has not been studied yet. This paper therefore studies the seismic enhancement of CSW structure with LVCB. Finite element models of CSWs with LVCB or RC coupling beam are developed and their hysteretic behaviors, energy dissipating capacities and damage modes are investigated by considering different floor configurations. Nonlinear time history analyses are also performed to evaluate the seismic responses of the LVCB enhanced CSW structure. Results show that applying the LVCB to the CSW makes the deformations concentrate in the damper, providing a favorable hysteretic performance with an equivalent damping ratio of about 0.35. The isolated floor reduces about 20 % of the initial stiffness of the CSW structure, but has insignificant effect on the loading capacity, which can improve the damper's deformability and reduce damages of RC components. The seismic response analyses also demonstrate the effectiveness of the LVCB for structural response mitigation, giving the average reduction ratios on story drift, shear force and bending moment are 8.28 %, 11.49 % and 8.22 %, respectively. It is believed that the LVCB is a reliable and practical RCB, showing a wide application prospect in engineering practices.
Keyword ：
Coupled shear wall Coupled shear wall Cyclic performance Cyclic performance Hysteretic modelling Hysteretic modelling Lead viscoelastic coupling beam Lead viscoelastic coupling beam Replaceable fuse Replaceable fuse Seismic response analysis Seismic response analysis
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| GB/T 7714 | Fang, Xiaojun , Bi, Kaiming , Hao, Hong et al. Seismic performance enhancement of shear wall structures using lead viscoelastic coupling beam [J]. | ENGINEERING STRUCTURES , 2025 , 332 . |
| MLA | Fang, Xiaojun et al. "Seismic performance enhancement of shear wall structures using lead viscoelastic coupling beam" . | ENGINEERING STRUCTURES 332 (2025) . |
| APA | Fang, Xiaojun , Bi, Kaiming , Hao, Hong , Ding, Hao , Lie, Wenchen , Chen, Zhangyan et al. Seismic performance enhancement of shear wall structures using lead viscoelastic coupling beam . | ENGINEERING STRUCTURES , 2025 , 332 . |
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High-performance concrete-filled steel tube (CFST) members consisting of high-strength steel and ultra-high performance concrete (UHPC) are more and more widely applied in modern engineering structures. These structures/structural components may suffer from axial impact loading during its life cycle such as impact induced by the collapse of top-level floors. However, the design and evaluation methods for axial impact resistance remain unclear for these structures. This paper presented a systematic study on both the impact and post-impact resistances of high-performance CFST members subjected to axial impact. A database of CFST members subjected to axial impact was first compiled, and a finite element (FE) model was established and verified by the test results from the compiled database. The effects of key parameters on the impact resistances and residual capacity of square UHPC-filled high-strength steel tubes under axial impact were clarified. By employing 420 FE models of square CFST columns subjected to axial impact with random parameters, equations for predicting the maximum axial displacement under axial impact and axial residual bearing capacity after axial impact that are suitable for conventional and high-performance CFST columns (fy <= 960 MPa and fcu <= 200 MPa) were developed with reasonable accuracy. Finally, a maximum deformation limit was recommended for CFST components subjected to axial impact, which provides a reference for anti-impact design and evaluation for general high-performance CFST members.
Keyword ：
Axial impact resistance Axial impact resistance Concrete-filled steel tube Concrete-filled steel tube High-strength steel High-strength steel Prediction method Prediction method Residual capacity Residual capacity
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| GB/T 7714 | Yang, Xiaoqiang , Zhu, Liguo , Bi, Kaiming et al. Design and evaluation methods for CFST members with high-performance materials subjected to axial impact [J]. | ENGINEERING STRUCTURES , 2025 , 327 . |
| MLA | Yang, Xiaoqiang et al. "Design and evaluation methods for CFST members with high-performance materials subjected to axial impact" . | ENGINEERING STRUCTURES 327 (2025) . |
| APA | Yang, Xiaoqiang , Zhu, Liguo , Bi, Kaiming , Zhao, Hui , Zhu, Yong , Lai, Zhichao . Design and evaluation methods for CFST members with high-performance materials subjected to axial impact . | ENGINEERING STRUCTURES , 2025 , 327 . |
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Extreme loads, such as impacts and explosions, can cause significant damage to structural components. It is crucial to thoroughly examine the residual bearing capacity of structures subjected to these extreme loads, which will enable engineers to make informed recommendations regarding repairs or reinforcements, thereby preventing further damage and extending the lifespan of these structures. This study presented an experimental and numerical investigation into the residual behavior of ultra-high-performance concrete-filled high-strength square steel tube (UHPC-FHST) members after lateral impact. A total of 15 tests were conducted, including lateral impact tests using a drop hammer testing machine and subsequent axial compression tests using a hydraulic testing machine. Of these, 12 specimens were subjected to impact loading followed by residual capacity assessment, while three intact specimens served as control groups during the axial compression tests. The failure modes, residual bearing capacity, and load-displacement curves of the specimens were obtained. Based on the experimental results, parametric analyses were performed to examine the effects of the yield strength of the steel tube, tube thickness, impact location, and impact energy on the residual mechanical performance of specimens (i. e., residual lateral deformation, residual axial bearing capacity, and residual ratio). The results showed that UHPC-FHST specimens exhibited excellent resistance to lateral impact, retaining a large level of residual bearing capacity after impact; increasing the yield strength and thickness of the steel tube effectively reduces residual deformation, and significantly enhances its residual capacity and energy absorption capacity; overall flexural failure and following second-order effects weakened the residual capacity of mid-span impact specimens, and shear failure and crack propagation of concrete were the main causes of damage for end impact conditions. Finally, a finite element (FE) model was also developed and validated using the experimental data. The established FE model demonstrated good agreement with the test results, offering a solid theoretical basis for further research on the residual performance of UHPC-FHST members subjected to lateral impact.
Keyword ：
Concrete-filled steel tube Concrete-filled steel tube Finite element analysis Finite element analysis High-strength steel High-strength steel Lateral impact Lateral impact Residual behavior Residual behavior UHPC UHPC
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| GB/T 7714 | Yang, Xiaoqiang , Huang, Jie , Zhang, Zhiqi et al. Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact [J]. | ENGINEERING STRUCTURES , 2025 , 341 . |
| MLA | Yang, Xiaoqiang et al. "Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact" . | ENGINEERING STRUCTURES 341 (2025) . |
| APA | Yang, Xiaoqiang , Huang, Jie , Zhang, Zhiqi , Fang, Xiaojun , Li, Dong , Bi, Kaiming . Residual axial compressive behavior of UHPC-filled high-strength square steel tubular members after lateral impact . | ENGINEERING STRUCTURES , 2025 , 341 . |
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Repeated loading and unloading tests were carried out on concrete under different confining pressures and strain rates to characterize the damage using the decrease in elastic modulus, and a damage evolution equation considering the effects of confining pressure and strain rate was established. At the same time, the yield criterion and equation of state of the Holmquist-Johnson-Cook (HJC) model were modified by combining the experimental data of high confining pressure. The modified model was validated by performing single -element numerical simulations for different stress states. Then, experiments were carried out on the penetration of tungsten alloy projectiles into concrete slabs, with penetration velocities ranging from 172 m/s to 302 m/s. The depth of penetration and crater area were obtained. Numerical simulations were subsequently carried out using the proposed model. The results showed that this model can describe the behaviour of concrete under dynamic loading. Finally, the damage evolution mechanism of concrete during the penetration process is analysed in conjunction with the proposed damage evolution equation.
Keyword ：
Concrete Concrete Constitutive model Constitutive model Mechanical properties Mechanical properties Numerical simulation Numerical simulation Projectile Projectile
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| GB/T 7714 | Huang, Ruiyuan , Wen, Yanbo , Li, Yi et al. Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration [J]. | ENGINEERING FAILURE ANALYSIS , 2024 , 158 . |
| MLA | Huang, Ruiyuan et al. "Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration" . | ENGINEERING FAILURE ANALYSIS 158 (2024) . |
| APA | Huang, Ruiyuan , Wen, Yanbo , Li, Yi , Zhou, Hao , Yang, Xiaoqiang , Qin, Jian et al. Application of concrete damage evolution equation considering confining pressure and strain rate effects in projectile penetration . | ENGINEERING FAILURE ANALYSIS , 2024 , 158 . |
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The current research on the cavitation phenomenon in the underwater explosion process is focused on the shock wave phase. In this study, it was found that there was also significant cavitation during bubble pulsation. Underwater explosion experiments were carried out at the bottom of a sheet using 2.5 g of TNT, which also showed that: (a) Cavitation lasts for the same duration as the bubble contraction time, (b) A cavitation closure pressure, the peak of which is greater than the bubble pulsation pressure, is produced by the closing of the cavitation zone. A tensile cut-off model was introduced to simulate the cavitation phenomenon during bubble pulsation, and the formation mechanism was investigated. The numerical simulation results show that: (a) The cavitation phenomenon is visible when the sheet above the explosive and the explosion distance are between 0.93 and 1.17 times the radius of the largest bubble, or between 0.69 and 1.85 times the maximum radius of the bubble when the sheet below the explosive, (b) The cavitation region and cavitation closure pressure increase and decrease with increasing explosion distance, peaking at a value close to one times the theoretical maximum bubble radius, and (c) The cavitation zone shrinks and the cavitation closing pressure drops as sheet thickness increases.
Keyword ：
Bubble pulsation Bubble pulsation Cavitation Cavitation Near-field Near-field Underwater explosion Underwater explosion
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| GB/T 7714 | Wen, Yanbo , Qin, Jian , Lai, Zhichao et al. Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process [J]. | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
| MLA | Wen, Yanbo et al. "Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process" . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING 186 (2024) . |
| APA | Wen, Yanbo , Qin, Jian , Lai, Zhichao , Meng, Xiangyao , Yang, Xiaoqiang , Chi, Hui et al. Experimental and numerical simulation investigation of cavitation phenomenon during bubble pulsation process . | INTERNATIONAL JOURNAL OF IMPACT ENGINEERING , 2024 , 186 . |
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Near-field underwater explosions generate complex load forms and cause destructive strikes on ships. To investigate the damage characteristics of ships under the combined effect of multiple loads, local and overall damage modes were first investigated through the combination of experimental tests and numerical simulation. Then a series of numerical simulations of full-scale ships subjected to near-field underwater explosions with different stand-off distances, equivalents, and detonation positions were carried out. The damage effects of shock wave, bubble pulsation, after flow, and water jet loads on ships were analyzed. The results show that the combined effects of different loads lead to different damage modes. Shock waves and after flow loads are the main cause of local damage and hogging damage, while pressure difference and bubble adsorption are the main reasons for the hogging damage. Finally, a criterion was proposed to determine the damage modes of ships under near-field underwater explosions.
Keyword ：
CEL method CEL method Full-size ships Full-size ships Near-field underwater explosion Near-field underwater explosion Numerical simulation Numerical simulation Ship damage modes Ship damage modes
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| GB/T 7714 | Huang, Ruiyuan , Jiang, Yipeng , Qin, Jian et al. Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads [J]. | MARINE STRUCTURES , 2024 , 98 . |
| MLA | Huang, Ruiyuan et al. "Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads" . | MARINE STRUCTURES 98 (2024) . |
| APA | Huang, Ruiyuan , Jiang, Yipeng , Qin, Jian , Meng, Xiangyao , Chi, Hui , Yang, Xiaoqiang et al. Investigation on the coupling damage effects of ships subjected to near-field underwater explosion loads . | MARINE STRUCTURES , 2024 , 98 . |
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The cavitation phenomenon caused by near-field underwater explosion imposes a secondary loading on ship structures. Studying the cavitation effects of plates during underwater explosions has implications for ship protection since plate is a typical structure of ships. This paper experimentally investigated the behavior of fixed square plates subjected to near-field underwater explosions. Experimental results indicated that cavitation existed in both shockwave and bubble pulsation stages; and the cavitation closure load at bubble pulsation stage was measured. To further investigate the cavitation phenomenon and the load characteristics at the bubble pulsation stage, finite element models were developed. The numerical results show that cavitation will increase the bubble load impulse by 47 % under specific conditions. These models were then used to investigate the influence of the stand-off distance and charge weight on cavitation area and load characteristics. An empirical formula was finally proposed to predict the coupled impulse of cavitation closure, bubble pulsation and water jet. This research has practical guidelines for the protection design of ship structures.
Keyword ：
Bubble pulsation Bubble pulsation Cavitation Cavitation Impulse Impulse Load Load Underwater explosion Underwater explosion
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| GB/T 7714 | Huang, Ruiyuan , Chen, Yufan , Qin, Jian et al. Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion [J]. | OCEAN ENGINEERING , 2024 , 295 . |
| MLA | Huang, Ruiyuan et al. "Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion" . | OCEAN ENGINEERING 295 (2024) . |
| APA | Huang, Ruiyuan , Chen, Yufan , Qin, Jian , Meng, Xiangyao , Wen, Yanbo , Yang, Xiaoqiang et al. Investigation on cavitation phenomena and load characteristics of fixed square plates subjected to near-field underwater explosion . | OCEAN ENGINEERING , 2024 , 295 . |
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Impacts have the distinctive characteristics of diverse conditions, low frequency, repeated occurrence, and high hazard; as such, they have emerged as a leading factor in bridge collapses. Ultra-high-performance concrete (UHPC)-filled high-strength steel tubular members are the preferred choice for large-span and high-pier bridges whose vulnerability to impacts cannot be ignored. Nine UHPC-filled high-strength square steel tubular specimens were designed in this study to explore their axial impact resistances and residual bearing capacities using a drop hammer and a hydraulic testing machine, respectively. The influence of impact energy and UHPC steel fiber content on key performance indicators including impact force, deformation, energy absorption, residual capacity, and residual rate were subsequently evaluated. The results show that the impact resistance and residual capacity of a UHPC-filled high-strength steel tubular member are significantly higher than those of a high-strength concrete-filled high-strength steel tubular member and that UHPC members can withstand greater levels of axial impact energy. Furthermore, the strong bonding behavior between the steel fibers and concrete matrix, as well as the resulting fiber network skeleton, can effectively improve the strength, crack resistance, ductility, and energy dissipation capacity of UHPC. Indeed, the incorporation of steel fibers significantly reduces the peak displacement and residual deformation of components subjected to axial impact by up to 14. 3% and 31. 4%, respectively, and an increase in steel fiber volume content from 0% to 2% increases the energy absorption per unit deformation by 38. 4%. In addition, when a specimen does not suffer severe damage from the axial impact, its residual bearing capacity and residual rate increase significantly by up to 28. 3 % and 12. 4 %, respectively. Therefore, an appropriate increase in fiber content (up to 2 %) can improve the axial impact resistance and residual bearing capacity of a UHPC-filled high-strength square steel tubular member. However, the steel fiber contents considered in this study align with conventional engineering practice, and a more comprehensive assessment and analysis should be conducted for scenarios beyond this scope. © 2024 Chang'an University. All rights reserved.
Keyword ：
Bearing capacity Bearing capacity Benchmarking Benchmarking Energy absorption Energy absorption Energy dissipation Energy dissipation High performance concrete High performance concrete High strength steel High strength steel Steel fibers Steel fibers Steel testing Steel testing Tubular steel structures Tubular steel structures
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| GB/T 7714 | Yang, Xiao-Qiang , Zhang, Qiang , Lai, Zhi-Chao et al. Axial Impact and Residual Behavior of UHPC-filled High-strength Square Steel Tubular Members [J]. | China Journal of Highway and Transport , 2024 , 37 (5) : 234-245 . |
| MLA | Yang, Xiao-Qiang et al. "Axial Impact and Residual Behavior of UHPC-filled High-strength Square Steel Tubular Members" . | China Journal of Highway and Transport 37 . 5 (2024) : 234-245 . |
| APA | Yang, Xiao-Qiang , Zhang, Qiang , Lai, Zhi-Chao , Chen, Jian-Qing , Ma, Wen-Shuo . Axial Impact and Residual Behavior of UHPC-filled High-strength Square Steel Tubular Members . | China Journal of Highway and Transport , 2024 , 37 (5) , 234-245 . |
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