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Axial compressive behavior of concrete-filled double-skin steel tubular columns with localized cracks

structures 2025年 78卷

作者： Tong Zhang Shiqi Huang Shan Gao School of Civil Engineering Liaoning Technical University Fuxin Liaoning 123000 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 150000 China

Concrete-filled double-skin steel tubular (CFDST) columns are widely used in a wide range of applications such as high-rise buildings, long-span bridges, offshore platforms, and heavy-duty industrial structures. However, due to the exposed steel tube, the external steel tube of CFDST columns is prone to cracking during long-term service, which affects their normal and safe use. This paper presents the mechanical behavior of CFDST columns with localized cracks. The peak load, failure mode, and full-range load-strain curve were produced according to the FE (finite element) model which were all line up with the findings of the experimental study. The impact of localized cracks on the CFDST stub struts in terms of peak load, stiffness, and flexibility is evaluated. The results indicate that the crack length, crack width, and crack depth exert minimal influence on the ultimate load and stiffness of the specimen. The crack length, crack width, and crack depth significantly impact the specimen's ductility. The ductility of the specimen is rapidly reduced by 30.9 %, especially when the steel tubes are penetrated due to corrosion. The crack angle barely impacts the breaking strength of the specimen. As the crack angle increases, the stiffness gradually decreases and the ductility gradually increases. A predictive technique of an error of less than 6 % is shown for the axial compressive capacity of CDFST pile columns with localized cracks. Finally, the GA-BP neural network model demonstrates its improved accuracy and generalization ability by comparing the genetic algorithm to a standard BP neural network, exhibiting higher the coefficient of determination and lower prediction errors on training and test datasets.

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dynamic Characteristics and Force Analysis of Box Girder Under Tsunami Action Based On Level-Set Method

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SSRN 2024年

作者： Niu, Shilei Liu, Zhongxiang Guo, Tong Guo, Anxin Liu, Aimin School of Transportation Southeast University Nanjing210096 China Key Laboratory of Concrete and Prestressed Concrete Structures School of Civil Engineering Southeast University Nanjing210096 China Ministry-of-Education Key Laboratory of Structural Dynamic Behavior and Control School of Civil Engineering Harbin Institute of Technology Harbin150090 China China Energy Engineering Group Jiangsu No.1 Electric Power Construction Co. Ltd. Nanjing210001 China

Tsunamis pose significant threats to the safety of sea-crossing bridges. Understanding the dynamics of wave forces and girder responses during tsunami events is crucial for ensuring their safe maintenance. In this research, a 2D numerical flume with solitary waves was utilized to simulate tsunamis. The level-set method was used for the treatment of fluid-solid interface and free surface. The interaction between the tsunami and the bridge girder was replicated through real-time data exchange between the fluid and a spring-mass-damper system. Subsequently, the hydrodynamic behaviors of the fluid surrounding the box girder and the structural responses of the girder under tsunami conditions were examined through parametric analysis. Findings suggest that tsunami with larger wave height interacts with box girder for longer duration. The maximum resistance and moment occur at the instant when the fluid acts on the top plate. Considering fluid-structure interaction and bearing constraints, increasing bearing stiffness results in substantial reductions (79.28%~85.32%) in girder displacement. Additionally, the maximum horizontal displacement of the unsubmerged box girder exceeds that of the submerged state by 2.04mm. Moreover, horizontal forces on the box girder decrease by 19.25%~45.30%, while maximum horizontal compression and tension on the wave-facing side bearing decrease by 10.7%~14.8% and 25.7%~29.9%, respectively. The maximum compression is approximately 2.68~3.34 times the maximum tension. © 2024, The Authors. All rights reserved.

关键词： Numerical methods

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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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Efficient structural seismic performance evaluation method using improved endurance time analysis

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Earthquake Engineering and Engineering Vibration 2019年第4期18卷 795-809页

作者： Li Shuang Liu Kun Liu Xiangyang Zhai Changhai Xie Fengwei 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

Evaluation of structural performance under seismic excitations from low intensity to high intensity is essential to verify the seismic resistant capacity of a structure, and usually carried out by the incremental dynamic analysis (IDA) method or pushover method. The recently developed endurance time (ET) method is another method that uses dynamic pushover excitations, i.e., endurance time acceleration function, to obtain results similar to those obtained by IDA or pushover methods with low computational cost and acceptable accuracy. This study proposes an improvement on the ET method by considering more restrictions for both the elastic and inelastic response spectra in the generation procedure, and by specifying a target duration. Four reinforced concrete frame structures with 4, 8, 12, and 16 stories are adopted to verify the accuracy of the improved method. Comparison of the results obtained by the proposed method, the ET method and the IDA method shows that the improved method has a higher accuracy than the ET method. For evaluation of structural responses under specifi c ground motion intensity, which is typically required in seismic design codes, the results obtained by the proposed method are compared with fi ve commonly used ground motion selection methods, and shows the proposed method provides acceptable accuracy for engineering applications.

关键词： seismic performance evaluation endurance time method inelastic response spectra target duration

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Early-Age Hydration Heat Evolution and Kinetics of Portland Cement Containing Nano-Silica at Different Temperatures

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SSRN 2022年

作者： Bai, Shuai Guan, Xinchun Li, Guoyu Key Lab of Structures Dynamic Behavior and Control The Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters The Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China Harbin Institute of Technology Harbin150090 China State Key Laboratory of Frozen Soil Engineering Northwest Institute of Eco-Environment and Resources Chinese Academy of Sciences Lanzhou730000 China

This study investigated the influence of nano-silica dosages and hydration temperatures on the early-age hydration heat of cement using isothermal calorimetry, and a hydration kinetics model was used to analyze the nucleation and growth rates of hydrates. The calorimetry results show that the addition of nano-silica and the increase of hydration temperature can accelerate the process of hydration reaction. As the dosage of nano-silica increases, the induction period decreases, the acceleration period and exothermic rate peak value increase. The fast pozzolanic effect of nano-silica is responsible for accelerating the hydration reaction. However, the excessive addition (5%) of nano-silica may form many agglomerations, thereby inhibiting the modification effect of nano-silica on the cement hydration. The simulating results of kinetic parameters show that, at three hydration temperatures, the nucleation rate of hydrates increase with the increasing of nano-silica dosages, which indirectly confirms the nucleation effect of nano-silica in the early-age hydration. At 20 °C and 30 °C, the growth rate of hydrates also increases with the increasing of nano-silica dosages. At 40 °C, the growth rate of hydrates is decreased gradually, possibly due to the lack of sufficient Ca2+ and H2SiO42-. In addition, the nucleation rate is more sensitive and the growth rate is less sensitive to the hydration temperature. © 2022, The Authors. All rights reserved.

关键词： Hydration

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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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Aerodynamic design and analysis for offshore wind turbine blade model

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Energy 2025年 330卷

作者： Ziyang Zhang Wen-Li Chen Jiabin Liu 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

Model experiments are essential for designing and analysing offshore wind turbines. During the scaling process of the model, the rotor thrust significantly decreases due to the Reynolds number effect. As wind turbines increase in size, blade length also gradually increases. The scaling ratio of the model decreases due to laboratory size constraints, affecting the structural loading characteristics. Therefore, this study performs an aerodynamic design for model blades, considering the Reynolds number effects and geometric dimensions. The optimised blade satisfies the scaled model's thrust requirements when its length is shorter than the scaled prototype blade. We employed the low Reynolds number airfoil SG 6043 to optimise the model blade. The geometric parameters of the optimised blades were calculated using the blade element momentum theory and pattern search method. Wind tunnel experiments were conducted on the optimised blade to analyse the variation characteristics of rotor thrust. The research results show that the numerical calculation results of rotor thrust generally align with the experimental results. The rotor thrust of the optimised blades was significantly enhanced, meeting the scaled model's thrust requirements. The error between the optimised blade's rotor thrust and the scaled target value is less than 2 %.

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Experimental and numerical studies on axial residual capacity of HSCHS tube after lateral impact

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Thin-Walled structures 2025年 215卷

作者： Yang, Kaiyun Zhai, Ximei Gao, Huaxiao Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Harbin150090 China

In this paper, experimental works of 19 impacted high-strength steel circular hollow section (HSCHS) specimens and one non-impacted specimen were carried out, to obtain their axial residual compressive performance subjected to compressive loading The experiments were performed using an electro-hydraulic servo press, and the results were analyzed in terms of failure mode, load–displacement relationship, strain, and deformation. The effect of impact energy, diameter-to-thickness ratio, axial compression ratio and hammer head type on the axial residual capacity of HSCHS tubes was investigated. The failure modes observed from the tests presented a combination of overall instability and local buckling. The finite element (FE) model of HSCHS tube subjected first to lateral impact and then to axial compression loading was established using nonlinear FE analysis platform ANSYS/LS-DYNA. After verifying the accuracy of the FE model by comparison with the test results, a parameter analysis was conducted to reveal the influence of impact energy, diameter-to-thickness ratio, axial compression ratio, impact location and slenderness ration on axial residual capacity. Finally, based on the FE analysis, two simplified calculation equations were proposed to predict the axial residual capacity of HSCHS tube, providing reasonably good correlation with the experimental results. © 2025

关键词： Buckling modes

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

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

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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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