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Development of dimensionless P-I diagram for curved SCS sandwich shell subjected to uniformly distributed blast pressure

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Frontiers of Structural and Civil Engineering 2019年第6期13卷 1432-1445页

作者： Yonghui WANG Ximei ZHAI Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China

The curved steel-concrete-steel(SCS)sandwich shell was recently proposed to resist blast loading and it showed better blast resistant performance as compared to flat SCS sandwich shell via developing compressive force along the *** this paper,a dimensionless Pressure-Impulse(P-I)diagram was constructed as a convenient tool to predict the damage level of curved SCS sandwich shell subjected to uniformly distributed blast *** curved SCS sandwich shell was equivalent to a single-degree-oMreedom(SDOF)system and the equation of motion was established by employing the Lagrange's *** construct the dimensionless P-I diagram,the energy balance method was utilized to yield the pressure and impulse asymptotes and the responses in the dynamic response regime were obtained via employing the SDOF ***,the finite element method was employed to validate the developed dimensionless P-I ***,the procedures of using the constructed dimensionless P-I diagram to quickly conduct the blast resistant design of curved SCS sandwich shell were presented.

关键词： blast loading curved steel-concrete-steel sandwich shell Pressure-Impulse diagram single-degree-of-freedom method finite element analysis

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Experimental study on square RC short columns strengthened with corrugated steel jacket under axial compression

arXiv

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arXiv 2025年

作者： Fan, Yang Ligui, Yang Yuyin, Wang Yong, Fang Shuangshuang, Jin Yunwen, Chen Qilong, Xia No.3 Construction Co. Ltd. Chongqing Construction Engineering Group China School of Civil Engineering Chongqing Jiaotong University Chongqing400074 China Key Lab of Structures Dynamic Behaviour and Control The Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China

In the long-term service of life, structural columns may experience mechanical performance degradation due to environmental erosion, various hazards, and functional modifications. This study proposes a novel concrete column reinforcement method utilizing square corrugated steel jackets as external confinement components, which significantly enhances both bearing capacity and ductility of original members. To investigate the mechanical performance improvement mechanisms and load-carry mode, 10 axially compressed short column specimens were designed. Detailed analyses were conducted surrounding the effects of connection methods for corrugated sheets, corrugated steel thickness, and damage levels on load-displacement curves, as well as stress and strain development patterns. A computational model for ultimate bearing capacity of reinforced sections was established. key findings include: (1) The use of corrugated steel sleeves can enhance the ultimate bearing capacity of the original short columns by 34.6% to 67.3%. (2) Considering that the confinement effect of square sleeves is not optimal, it is more material-efficient to use thinner corrugated steel plates to achieve similar results. (3) There is no significant difference in the effects of connection types on mechanical performance. (4) The cracking and softening of damaged concrete can enhance the confinement effect in corrugated steel-strengthened reinforced concrete columns. (5) The confined concrete strength model can be used to accurately predict the ultimate bearing capacity. Copyright © 2025, The Authors. All rights reserved.

关键词： Axial compression

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Low-cycle fatigue behavior of high-strength bolts under combined tension-shear loading

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Engineering structures 2025年 340卷

作者： Wenyuan Zhang Jingyi Xie Shuaiyu Li Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China

Bolted connections are widely used in steel structures and often experience combined tension-shear stress, as seen in the connection of brace to beam-column. Under seismic loading, these connections are susceptible to low-cycle fatigue failure, potentially leading to structural collapse. Research on the low-cycle fatigue behavior of high-strength bolts under combined loading remains limited. This study addresses this gap by conducting low-cycle fatigue tests under four tension-shear loading patterns. When the tensile-to-shear displacement ratio was 1:1, all bolts fractured along a plane approximately 45° to the shear plane. Test results show that the tension-shear fracture displacement is around 13 δ y (tensile yield displacement), with an ultimate tension-shear strength of about 0.68 F y (tensile yield capacity) and an anti-slip capacity of approximately 0.22 F y . The tensile-shear failure criterion for high-strength bolts is displacement-based. The coefficient k  = 1.6 is applicable to the failure prediction across tension-shear displacement ratios spanning 0.577–1.732. The study also establishes a formula for describing the bolt preload loosening under cyclic tension-shear loading. The low-cycle fatigue life of high-strength bolts under combined loading is significantly shorter than under uniaxial fatigue loading. A predictive method for low-cycle fatigue life based on combined strain amplitude demonstrated good accuracy. Numerical models incorporating ductile damage and combined hardening accurately predicted fatigue life and damage progression. Stress-strain analysis identified variations in tensile and shear yield sequences and pinpointed crack initiation locations on the failure plane.

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Genetic algorithm-based shape optimization of plates for reducing wave loads on cylindrical structure

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Ocean Engineering 2025年 337卷

作者： Jingbo Qing Peimian Du Pengwei Bei Jiabin Liu Anxin Guo Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Theoretical studies have shown that incorporating protective plates into cylindrical structures reduces wave-induced loads. This study applies the Boundary Element Method (BEM) to analyze linear wave-structure interactions and employs the Genetic Algorithm (GA) for global optimization to determine the optimal plate shape. Experimental analyses were conducted under various wave conditions to further evaluate the performance of the protective plates. The evaluation included three distinct types of protective plates: the GA-optimized curved plate, the flat plate, and the porous plate. The results show that all three protective plate types effectively reduce wave-induced loads but also increase wave run-up. Compared to flat and porous plates, the optimized curved plate performs better in reducing bending moments. The effectiveness of the protective plates is not significant near k 0 R = 0.5 , and may even increase wave loads. The influence of protective plates resembles wave shoaling, altering wave forms and dissipating energy. Wave impact and breaking can occur during this process, highlighting the limitations of linear potential flow theory in modeling interactions between waves and protective plates.

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Experimental Study of High-Temperature Resistance of Alkali-Activated Slag Crushed Aggregate Mortar

SSRN

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SSRN 2022年

作者： Huang, Wenxuan Wang, Ying Zhang, Yaming Zheng, Wenzhong School of Civil Engineering Harbin Institute of Technology Haihe Road #202 Nangang District Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Key Lab Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology School of Civil Engineering Harbin Institute of Technology Haihe Road #202 Nangang District Harbin150090 China

In this research, a special type of mortar with alkali-activated slag as cementitious material was examined, which had the characteristics of high strength, high temperature resistance and environmental protection. Its aggregates consisted of crushed and sieved particles of alkali-activated slag paste. The compressive strengths of 126 cubic and 126 prismatic specimens during and after high-temperature treatment were investigated. The test results showed that both the compressive and flexural strengths of the mortar during and after high-temperature treatment decreased with increasing temperature. Moreover, the compressive strength of the mortar after high-temperature treatment was higher than that during the treatment in which strength grade and temperature were constant. The high-temperature strength loss of the mortar was also found to be lower than that of concrete. The formulated equations for calculating the compressive and flexural strengths during and after high-temperature treatment provided a basis for evaluating the fire resistance of this new type of masonry material. The microstructure and composition of the mortar were analyzed using scanning electron microscopy with energy-dispersive spectrometry and X-ray diffraction. At 600 ℃, the mortar gradually produced new melilite products. © 2022, The Authors. All rights reserved.

关键词： Compressive strength

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Wave action by arrays of vertical cylinders with arbitrary smooth cross-section

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Journal of Hydrodynamics 2020年第1期32卷 70-81页

作者： Jia-bin Liu An-xin Guo Qing-he Fang Hui Li Hui Hu Peng-fei Liu Key Lab of Structures Dynamic Behavior and Conrol of the Ministry of Education Harbin Institute of Techno-logyHarbin 150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin 150090China Depariment of Aerospace Engineering lowa State UniversityAmeslowa 50011USA China Railway Bridge Science Research Institute LtdWuhan 430034China

This paper presents an analytical model to solve the linear wave diffraction problem by arrays of bottom-mounted cylinders with arbitrary smooth *** on the assumption of ideal fluid and potential theory,the unknown coefficients of total velocity potential can be solved by system of linear equations,which are obtained from the boundary *** accuracy of the present method is verified by comparing it with the numerical tool in terms of the wave force and wave *** cylinders with different configurations are tested,the cross-section of which is circular with cosine *** results show that the proposed method could obtain an accurate prediction of the wave action with multiple cylinder ***,the diffraction wave is investigated on arrays of bottom-mounted cylinders with different cross-section and *** near-trapping problem with effects of the multi-body interaction are also investigated.

关键词： Wave diffraction cylinder array arbitrary smooth cross-section analytical solution

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Preparation and Properties of a Cement-Based Permeable Crystalline Repair Material

SSRN

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SSRN 2021年

作者： Lu, Rongwei Guan, Xinchun Zhang, Chenchen Kou, Yufeng Li, Jinglu Li, Yazhao Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology Harbin150090 China

According to the performance requirements of concrete repair materials, a new cement-based permeable crystalline repair material（CCRM） was prepared, and its repair performance and repair mechanism were studied by means of macro mechanical property test, micro ESEM and XRD. The experimental results show that the prepared repair material not only has good flow performance and strength, but also enhances the strength of the repair interface, so that the repair interface is no longer the weak point of the repaired specimen. Through the observation of the microstructure of the repaired specimen, it is found that CCRM can penetrate into the interface of the repaired specimen to form a cross transition zone, and then form a better integration with the repaired specimen, with very good compatibility. Through the test of CCRM repair products by XRD and TG, it is found that there is an active component in CCRM, which can consume calcium hydroxide to form a complex, promote the transformation of calcium carbonate and C-S-H, and then enhance the repair effect. © 2021, The Authors. All rights reserved.

关键词： Repair

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Environmental impact assessment of aircraft elevator made with new lightning protection material

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2022年第9期23卷 669-682页

作者： Shao-ce DONG Cheng-gao LI Gui-jun XIAN Zhong-jie ZHAO Xu-feng ZHANG Qing-wen YUN MOE Key Laboratory of Structures Dynamic Behavior and Control Harbin Institute of TechnologyHarbin 150090China MIIT Key Laboratory of Smart Prevention and Mitigation of Civil Engineering Disasters Harbin Institute of TechnologyHarbin 150090China Shool of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Aviation Industry Corporation of China Ltd.(AVIC)Composite Technology CenterBeijing 101300China Aviation Industry Corporation of China Ltd.(AVIC)Harbin Aircraft Industry Group Co.Ltd.Harbin 150066China

The non-metallic lightning strike protection film covering carbon fiber reinforced polymers(NM-LSP covering CFRP)can reduce the weight and thus the fuel consumption of aircraft by replacing the traditional lightning strike protection(LSP)*** the present study,in order to study the environmental influence of utilizing NM-LSP covering CFRP in an aircraft elevator,a new elevator was designed and manufactured,replacing the aluminium net and glass fiber reinforced polymers(GFRP)with NM-LSP covering CFRP,with the same mechanical and LSP abilities.A comparative life cycle assessment was conducted between the two kinds of aircraft elevators,including material extraction,transportation,elevator manufacturing phase,service phase,and end-of-life ***,the environmental impacts of producing two LSP materials were compared by considering the environmental effects of different buy-to-fly ratios and recycling strategies on the production of aluminium *** analysis indicates that the new elevator achieved reduction for all the environmental impact categories used,such as human toxicity potential and marine aquatic ecotoxicity potential(3.83%and 3.20%reduction).Furthermore,it is found that the service phase makes the greatest contribution to the environmental impact of the elevators under *** recycling is excluded,NM-LSP covering CFRP is more environmentally friendly than the traditional *** the same time,CFRP prepreg and electricity from the production of NM-LSP covering CFRP contribute to a higher environmental impact compared to the NM-LSP *** the sensitivity analysis,it is believed that NM-LSP covering CFRP can reduce environmental impact compared with traditional LSP materials.

关键词： Environmental impact assessment Lightning strike protection(LSP)material Aircraft elevator Life cycle assessment(LCA) Non-metallic lightning strike protection(NM-LSP)material

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Optimal overlays for preservation of concrete in cold climate: decision-making by the method of fuzzy comprehensive evaluation combined with AHP

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Journal of Infrastructure Preservation and Resilience 2021年第1期2卷 1-16页

作者： Li, Zhipeng Dang, Yudong Tang, Zhen Xie, Ning Lu, Shuang Shi, Xianming Department of Civil & amp Environmental Engineering Washington State University PullmanWA99164-2910 United States Yunnan Key Laboratory of Building Structure and New Materials Yunnan Institute of Building Research Kunming650223 China Key Lab of Structure Dynamic Behavior and Control Ministry of Education Heilongjiang Harbin150090 China School of Civil Engineering Harbin Institute of Technology Heilongjiang Harbin150090 China Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials University of Jinan Shandong Jinan250022 China

Overlays have been extensively employed as an effective preservation or rehabilitation tool to extend the service life of concrete bridges and pavements, especially concrete slabs suffering from salt scaling and abrasion. However, limited attention has been paid to the durability and performance of these overlays which can be jeopardized when they are exposed to freeze/thaw and wet/dry cycles, deicer applications, studded tires, and their coupled effects. Various overlays feature different engineering properties, and they might be only effective in specific service environments but not in others, and research is lacking to examine their ability to adapt to different environments. This study subjected five overlay products on concrete slabs to the combined action of freeze/thaw (F/T) and wet/dry (W/D) cycles with periodical exposure to either 15 wt.% NaCl solution or 15 wt.% MgCl2 solution, to simulate the typical field scenarios in an accelerated manner. The bond strength, splitting tensile strength, and abrasion resistance of the overlaid concrete slabs were tested to evaluate the effectiveness of various overlays against the deicer scaling and the abrasion by studded tires. Based on the experimental data, this study demonstrated a multi-criteria decision-making method, fuzzy comprehensive evaluation (FCE) combined with analytic hierarchy process (AHP), for the selection of optimal overlays in three different service scenarios (e.g., states of Washington and Oregon [USA] and British Columbia [Canada]). The analysis results indicate that one epoxy overlay exhibited the comprehensively best performance and could be a promising candidate in all three given scenarios, another polymer overlay took second place, while the adaptability of the three cement-based overlays varied in different environments. Graphical Abstract: (Figure presented.). © The Author(s) 2021.

关键词： Sodium chloride

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Gap effects on the aerodynamic characteristics and flow patterns of a long-span rail-cum-road bridge girder with three separated boxes

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Journal of Wind Engineering and Industrial Aerodynamics 2025年 264卷

作者： Yize Ran Wen-Li Chen Hui Li Donglai Gao Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin 150090 China State Key Laboratory for Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi’an Jiaotong University Xi’an 710049 China

Separated box girder configurations enhance flutter stability in long-span bridges but introduce more complex flow interactions within the gaps, potentially inducing vortex-induced vibrations (VIV) at lower wind velocities. This study investigates the effects of gap ratios ( G / H ) on the aerodynamic characteristics and flow patterns of a long-span rail-cum-road bridge girder with three separated boxes. Stationary wind tunnel tests were conducted for G / H ranging from 0.000 to 7.752. Combined time–frequency analysis, pressure measurements, and smoke–wire visualizations revealed distinct flow characteristics for various gap ratio cases. As G / H increased, the upstream and middle box girders successively influenced the flow through vortex impingement on the windward sides of the downstream box girders. When G / H exceeded a critical threshold, the dominant frequency of the wake flow behind the downstream box girder became pronounced, indicating a general reduction in the influence of the upstream wake. The surface pressure distributions corroborated the observed vortex dynamics. Four distinct gap flow patterns were categorized: Pattern A exhibited overshoot flows in both upstream and downstream gaps for G / H = 0 . 000 to 0.678; Pattern B featured shear layer impingement in the upstream gap combined with vortex impingement in the downstream gap for G / H = 0 . 775 to 1.260; Pattern C displayed vortex impingement in the upstream gap and a secondary vortex street in the downstream gap for G / H = 1 . 357 to 1.841; Pattern D demonstrated alternate vortex shedding in both upstream and downstream gaps for G / H = 1 . 938 to 7.752. The phase lag between the fluctuating lift coefficients of adjacent box girders and the spanwise coherence coefficient elucidated the aerodynamic characteristics of the three-box girder under different gap flow patterns.

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