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Research on dynamic response analysis and evaluation method of resistance to progressive collapse of reinforced concrete frame structures at high temperatures

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Zhendong yu Chongji/Journal of Vibration and Shock 2025年第12期44卷 298-307页

作者： Li, Zhi Huang, Xinhui Ji, Fuquan Zhong, Yu Deng, Xiaofang Guangxi Key Laboratory of Green Building Materials and Construction Industrialization Guilin541004 China School of Civil Engineering Guilin University of Technology Guilin541004 China CCCC Second Harbour Engineering Company Ltd. Wuhan430040 China

To investigate the collapse performance of reinforced concrete (RC) frame structures under high temperatures, ABAQUS finite element software was utilized to establish a finite element model for a two-story RC frame structure with instantaneous corner column removal. Based on the full validation of the model' s accuracy, the study examines the impact of different durations and areas of fire exposure on the dynamic response of the RC frame structure subjected to progressive collapse following corner column failure, through sequential thermo-mechanical coupling modeling. Furthermore, considering the uncertainty of parameters, a probabilistic assessment of the resistance to progressive collapse of RC frame structures under high temperatures was conducted. The results show that with the increase of fire time, when the first layer corner lattice is exposed to fire, the maximum peak displacement of the structure without columns increases by 153. 26% compared with that at room temperature, and its resistance mechanism is mainly cantilever action and vierendeel effect, and the tensile membrane effect occurs when exposed to fire for 60 min. When the first and second floor corner grids are exposed to fire, the maximum peak displacement of the structure after column removal is increased by 145. 81% . Compared with the first layer corner lattice exposed to fire, the vierendeel effect is weakened, but when exposed to fire for 60 min, the floor produces a more obvious tensile membrane effect to resist collapse. Based on the uncertainty of structure and load, the cumulative distribution function obtained by fitting can better evaluate the collapse probability of RC frame structure at high temperature. © 2025 Chinese Vibration engineering Society. All rights reserved.

关键词： ABAQUS

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Determination of surface properties of different formwork release agents on strength concrete

Determination of surface properties of different formwork re...

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作者： Durmuş, Gökhan Çelik, Damla Nur K. Demircan, Rüya Ç. Demirci, Erengül Gazi University Department of Civil Engineering Faculty of Technology Ankara Turkey Sinop University Construction Department Boyabat vocation School Sinop Turkey Gazi University Institute of Science Ankara Turkey

In this study, concrete samples were poured into mold using three different formwork oils and the impact of formwork oil on concrete surface hardness and carbonatization was investigated. 60x60x10 cm3 sized wood formworks were produced by class II pine timber. Three kinds of formwork oils were used such as standard (K1), concentrate (K2) and plywood formwork oils (K3). Concrete blocks were developed by pouring the C20 strength class of concrete into formworks. Concrete surface hardness and carbonatization depths were measured by taking cores giving dimensions of 50x100 mm. The results revealed that the highest surface hardness and carbonatization values were obtained from concentrate formwork oil. The surface hardness was 10 % higher and the carbonatization was 49 % least than oil-free formworks. © 2023

关键词： Compressive strength

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Dynamic mechanical properties and constitutive model of red sandstone under different loading rates and high temperatures

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Journal of Central South University 2025年第5期32卷 1922-1937页

作者： Li, Ye Yang, Sheng-qi Liu, Zi-lu Wang, Chao Li, Zi-li State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and Technology Xuzhou China School of engineering and architecture University College Cork Cork Ireland Department of Civil & Environmental Engineering Massachusetts Institute of Technology Cambridge USA

Dynamic compression experiments were conducted on red sandstone utilizing a split Hopkinson pressure bar (SHPB) to study the loading rate and high temperatures on their mechanically deformed properties and ultimate failure modes, and to analyze the correlation between the strain rate, temperature, peak strength, and ultimate failure modes. The results show that the mass decreases with the increase of treatment temperature, and the pattern of the stress –strain curves is not impacted by the increase of impact velocity. Under a fixed temperature, the higher the impact velocity, the higher the strain rate and dynamical compression strength, indicating a strain rate hardening effect for red sandstone. With an increasing treatment temperature, the strain rate gradually increases when the impact loading remains unchanged, suggesting a rise in the deformability of red sandstone under high-temperature environment. Raise in both impact velocity and treatment temperature leads to an intensification of the damage features of the red sandstone. Similarly, higher strain rates lead to the intensification of the final damage mode of red sandstone regardless of the change in treatment temperature. Moreover, a dynamic damage constitutive model that considers the impacts of strain rate and temperature is proposed based on experimental results.

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Exploring the relationship between the International Roughness Index (IRI) and the ISO 8608 roughness coefficient (Gd(n0))

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International Journal of Pavement engineering 2024年第1期25卷

作者： Lin, Jeng-Hsiang Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei Taiwan Department of Architecture Hwa Hsia University of Technology Taipei Taiwan

Globally, diverse agencies employ varied metrics to gauge road roughness, complicating the exchange of information for pavement maintenance. This study addresses this challenge by establishing a theoretical connection between the International Roughness Index (IRI) and the ISO 8608 Power Spectral Density (PSD)-based roughness coefficient, namely Gd(n0). Based on random vibration theory, this paper first deduces a closed-form explicit solution for IRI related to Gd(n0), solidifying a theoretical link. Next, the variability and convergence of the proposed solution are examined through Monte Carlo simulations using a quarter-car vehicle model with the Golden Car parameters. Then, we compare computed results from this study with those existing solutions from past studies, verifying that the proposed solution captures the curve trend well and agrees with the average value of existing solutions based on field measurement data. Finally, this paper proposes the IRI values corresponding to various ISO road class thresholds and a new Gd(n0) scale for ride quality assessment of highways. © 2024 Informa UK Limited, trading as Taylor & Francis Group.

关键词： Power spectral density

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Recent advancement and future challenges of photothermal catalysis for VOCs elimination:From catalyst design to applications

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Green Energy & Environment 2023年第3期8卷 654-672页

作者： Yang Yang Shenghao Zhao Lifeng Cui Fukun Bi Yining Zhang Ning Liu Yuxin Wang Fudong Liu Chi He Xiaodong Zhang Environment and Low-Carbon Research Center School of Environment and ArchitectureUniversity of Shanghai for Science and TechnologyShanghai 200093China College of Smart Energy Shanghai Jiao Tong UniversityShanghai 200240China Institute of Applied Biotechnology Taizhou Vocation&Technical CollegeTaizhou Zhejiang 318000China Department of Civil Environmentaland Construction EngineeringCatalysis Cluster for Renewable Energy and Chemical Transformations(REACT)NanoScience Technology Center(NSTC)University of Central FloridaOrlandoFL 32816United States State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power EngineeringXi'an Jiaotong UniversityXi'anShaanxi 710049China

Photothermal catalysis realizes the synergistic effect of solar energy and thermochemistry,which also has the potential to improve the reaction rate and optimize the *** this review,the research progress of photothermal catalytic removal of volatile organic compounds(VOCs)by nano-catalysts in recent years is systematically ***,the fundamentals of photothermal catalysis and the fabrication of catalysts are described,and the design strategy of optimizing photothermal catalysis performance is ***,the performance for VOC degradation with photothermal catalysis is evaluated and compared for the batch and continuous ***,the catalytic mechanism of VOC oxidation is systematically introduced based on experimental and theoretical ***,the future limitations and challenges have been discussed,and potential research directions and priorities are highlighted.A broad view of recent photothermal catalyst fabrication,applications,challenges,and prospects can be systemically provided by this review.

关键词： Photothermal catalysis VOCs Catalyst design Light-driven thermal catalysis Photothermal synergistic effect

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Ground surface vibration response law of different axial charge structures in tunnel hydraulic blasting

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Zhendong Gongcheng Xuebao/Journal of Vibration engineering 2025年第1期38卷 172-179页

作者： Zhao, Licai The Third Engineering Co. Ltd. China Railway 19th Bureau Group Corporation Limited Shenyang110136 China Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei10607 Taiwan

To investigate the influences of charge structures on the blast-induced ground vibration characteristics in hydraulic blasting，several onsite experiments were conducted in the context of Xinbin tunnel at the Shenyang to Jilin Expressway. Based on the onsite experiments，the peak particle velocity（PPV）and dominant frequency（DF）were analyzed under different kinds of charge structures，which includes the normal charge structure，the water bags located in the top of blasthole，the water bags located in the blasthole collar and the water bags located in the both ends of blasthole. In addition，the distribution laws of ground vibration under different charge structures were further studied using numerical simulation. The research results indicated that，compared with the normal charge structures，less explosive energy is converted into vibration energy in hydraulic blasting，resulting in smaller PPVs and higher DFs. Within 5 m of the cross section along the tunnel excavation face，the PPVs of blasting vibration under the normal charge structure exceed the vibration safety criteria，which is adverse for the safety control of ground structures. The converted vibration energy is relatively smaller along the direction of water bags in blasthole，but on the opposite direction of the blastholes more explosive energy is converted into vibration energy. In tunnel blasting excavation，the charge structure of the water bags located in the both ends of blasthole was recommended to promote the uniform distribution of vibration energy and minimize the disturbance to the surrounding structures. © 2025 Nanjing University of Aeronautics an Astronautics. All rights reserved.

关键词： Blasting

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Analysis of Shear Deformation of Column Structure Based on Load Equivalent Distribution Theory

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Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis 2024年第5期44卷 1023-1031and1044页

作者： Zhao, Licai Department of Civil and Construction Engineering National Taiwan University of Science and Technology Taipei106335 Taiwan The Third Engineering Co. Ltd. of China Railway 19th Bureau Group Shenyang110136 China

To enhance the calculation efficiency and accuracy of shear deformation in column structures with Timoshenko beam properties, an equivalent distributed load-finite element method is proposed, based on the theory of equivalent load distribution, node analysis method, and Timoshenko beam theory with orthogonal Interpolation characteristics. This method efficiently addresses the shear deformation displacement of beam-column joints, which is more accurate and efficient than existing algorithms in analyzing the shear deformation of the column structure. The reliability of the equivalent distributed load-finite element algorithm is verified through the study of two working cases, and the results demonstrate that highly accurate Solutions of displacement, angles of rotation, shear forces, and bending moment can be obtained using very few elements (one or two ele-ments). In contrast, other displacemenCbased methods, such as simplified Integration, require about 40 elements to achieve comparable results. This method can directly and systematically determine the stability func-tion and bending load of Timoshenko bearrrcolumn under different connection conditions, which effectively im_ prove the accuracy of finite element analysis Solution of shear deformation of column structure. © 2024 Nanjing University of Aeronautics an Astronautics. All rights reserved.

关键词： Shear deformation

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The Effect of Combined Information-Based Interventions on Chinese Residents’ Electricity Conservation: A Field Experiment in Shared Residences

SSRN

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SSRN 2023年

作者： Zhu, Jiaolan Li, Jie Liu, Ping Shang, Yongtao Ding, Zhikun Alam, Md. Morshed Department of Civil and Construction Engineering Lanzhou University of Technology China Department of Civil and Construction Engineering Centre for Sustainable Infrastructure and Digital Construction Swinburne University of Technology Melbourne Australia Department of Architecture and Civil Engineering City University of Hong Kong China Department of Construction Management and Real Estate Shenzhen University China

The use of combined information-based interventions to promote electricity-saving behavior among residents in shared spaces holds significant potential in reducing energy consumption and carbon emissions. However, this topic remains under-explored and poorly understood in China, where coal-fired power accounts for 58.40% of electricity generation. Despite some studies investigating the efficacy of combined information interventions on energy conservation, their effectiveness remains controversial. This study, therefore, designed three combined information interventions and conducted a 28-week field-controlled experiment to assess their effectiveness in motivating Chinese individuals in shared residences to save electricity. The Difference-in-Difference analysis was employed to evaluate their effectiveness. The results revealed that the strategy combining normative feedback and group-contrast feedback exhibited the most energy-saving effect, with an 8.75% energy savings relative to the control group. Surprisingly, the strategy combining normative feedback and instruction-based information failed to generate significant energy savings, but the addition of self-contrast feedback improved its energy-saving effect. Moreover, the effectiveness of the combined information interventions is influenced by the duration of messaging, with a two-to-three-week delay before a positive effect on behavioral change. The combined information interventions exhibited sustained energy-saving effect after they were withdrawn. However, the sustained energy-saving effect was found to decrease over time, necessitating further investigation to ensure long-term energy savings. These findings provide valuable insights and recommendations on how to use combined information interventions to motivate residents to conserve energy in shared spaces, including the need to consider the combinatory choices of intervention, intervention duration, and social contexts. © 2023, The Authors. All rights reser

关键词： Energy conservation

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Fatigue Strengthening of U-Rib Butt Welds in Orthotropic Steel Bridge Decks Using CFRP Sheets 6th

Fatigue Strengthening of U-Rib Butt Welds in Orthotropic Ste...

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6th International Conference on Smart Monitoring, Assessment and Rehabilitation of civil Structures, SMAR 2022

作者： Lv, Z.L. Jiang, X. Qiang, X.H. Bai, J. Ghafoori, E. School of Civil Engineering Tongji University Siping Road 1239 Shanghai China China Construction Eighth Engineering Division Co. Ltd. Century Avenue 1568 Shanghai China Empa Swiss Federal Laboratories for Material Science and Technology Überlandstrasse 129 DübendorfCH-8600 Switzerland

ISBN: (纸本)9789819933617

U-rib butt weld is one of the most important components in early orthotropic steel bridge decks, which plays a critical role in connecting the segments of steel box girders. However, fatigue cracks are prone to produce, and it will threaten the driving safety and reduce the reliability of the bridge structures. CFRP has been broadly adopted in the field of civil engineering reinforcement by virtue of its excellent performance. Pasting CFRP sheets to the U-rib butt weld can achieve non-destructive repair of the structures, thereby improving the fatigue performance of the fatigue detail. In this paper, two single U-rib specimens were designed and the real fatigue cracks were produced under the fatigue loading. Then strengthening method of pasting CFRP sheets were presented and fatigue strengthening test of cracked U-rib butt weld specimens were performed. The results showed that the average fatigue strength of the cracked welds after reinforcement at 2 million cycles is 76 MPa, and the average fatigue life can be increased by 2.3 times. © Tongji University Press 2024.

关键词： Bridge decks

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Effects of jet grouting slabs on responses for deep braced excavations

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Underground Space 2021年第2期6卷 185-194页

作者： Wengang Zhang Li Hong Yongqin Li Runhong Zhang Anthony T.C.Goh Hanlong Liu School of Civil Engineering Chongqing UniversityChongqingChina Key Laboratory of New Technology for Construction of Cities on Mountain Area Ministry of EducationChongqing UniversityChongqingChina School of Civil and Environmental Engineering Nanyang Technological UniversitySingapore

Jet grouting slabs are widely used in deep excavations owing to their effectiveness for reducing the deflection of the diaphragm wall and the prop forces acting on the struts and improving the basal-heave *** this paper,according to case histories in Singapore,a series of finite-element numerical simulations are performed to evaluate the effects of jet grouting slabs on responses to deep braced *** the basis of a parametric sensitivity study,a reasonable thickness of jet grouting slabs is *** effects of the wall depth,wall stiffness,soft-clay thickness,and stiffness on the performance of the jet grouting slabs are assessed by comparing and analyzing a series of simulation *** is found that the soft-clay thickness significantly affects the wall deflection and basal heave in deep *** the design of support structures,soil profiles should be considered *** findings of this study provide a reference and guidance for the support system design of similar projects.

关键词： Jet grouting slab Deep excavation Soft clay Finite-element analysis

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