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A sophisticated simulation for the fracture behavior of concrete material using XFEM

Earthquake Engineering and Engineering Vibration 2017年第4期16卷 859-881页

作者： Zhai Changhai Wang Xiaomin Kong Jingchang Li Shuang Xie Lili School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control(Harbin Institute of Technology) Ministry of EducationHeilongjiangHarbin 150090China Institute of Engineering Mechanics China Earthquake AdministrationHarbin 150080China

The development of a powerful numerical model to simulate the fracture behavior of concrete material has long been one of the dominant research areas in earthquake engineering. A reliable model should be able to adequately represent the discontinuous characteristics of cracks and simulate various failure behaviors under complicated loading conditions. In this paper, a numerical formulation, which incorporates a sophisticated rigid-plastic interface constitutive model coupling cohesion softening, contact, friction and shear dilatation into the XFEM, is proposed to describe various crack behaviors of concrete material. An effective numerical integration scheme for accurately assembling the contribution to the weak form on both sides of the discontinuity is introduced. The effectiveness of the proposed method has been assessed by simulating several well-known experimental tests. It is concluded that the numerical method can successfully capture the crack paths and accurately predict the fracture behavior of concrete structures. The influence ofmode-Ⅱ parameters on the mixed-mode fracture behavior is further investigated to better determine these parameters.

关键词： fracture behavior concrete material earthquake engineering interface constitutive model XFEM

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Analysis of micro-disturbance drilling pipe pre-reinforcement method for deep excavations above operating subway tunnels

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Frontiers of Structural and Civil Engineering 2025年

作者： Tang, Wenchong Kong, Xiangxun Tang, Liang Ling, Xianzhang School of Civil Engineering Harbin Institute of Technology Harbin150090 China Chongqing Research Institute Harbin Institute of Technology Chongqing401135 China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin150090 China

This paper uses the three-dimensional numerical simulation method to analyze the first deep foundation pit project directly above the operating subway in a certain area. The monitoring data were compared with the numerical results to verify the accuracy of the numerical model, and then a series of analyses were performed. The soil beneath the tunnel is the most direct object of tunnel deformation caused by the excavation of deep foundation pits above the tunnel. The rebound deformation of the soil beneath the tunnel forces the tunnel to produce an upward deformation cooperatively. Therefore, after comparing and analyzing the prevention criteria of traditional excavation measures, which were not sufficient for this project, a new method of fortification is proposed for the foundation pit above the tunnel, which is called the micro-disturbance drill pipe pre-reinforcement method (PRM) for the soil beneath the tunnel. The comprehensive parameter analysis of the PRM shows that the PRM can effectively reduce the uplift value of the tunnel, and the reinforcement effect is obvious. © Higher education Press 2025.

关键词： Tunneling (excavation)

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Experimental investigation of shear behavior in precast concrete beams with steel bolted splice connections

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structures 2025年 78卷

作者： Khalil Abualtayef Wei Zhou School of Civil Engineering Harbin Institute of Technology Harbin 150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education School of Civil Engineering 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 School of Civil Engineering Harbin Institute of Technology Harbin 150090 China

Precast concrete structures with bolted connections offer significant advantages, including shorter construction times, improved quality control, and enhanced structural performance. This study investigates the shear behavior of precast concrete beams with steel-bolted splice connections (PCBSBs), which join the discontinuity of two short concrete beam segments, under monotonic loading. Afterwards, the shear performance of PCBSB beams was experimentally and analytically investigated. Six full-scale PCBSB specimens and one control concrete beam were tested to evaluate the effects of key parameters include the shear span ratio and steel plate thickness. The test results show that the failure modes of PCBSB beams are similar to those of reinforcement concrete beams, and the crack propagations can be well controlled by the steel plate thickness. Using a steel bolted connection with a thickness of 3 mm and 5 mm increased the shear crack load by 9 % and 24 %, respectively. After the loading reached 65 % of the peak load, the deflection of steel bolted connection begins to increase more than the shear load deflection till peak load. For beams with long shear span ratio, increase of steel plate thickness led to increase the stiffness, and peak load. Higher a/d ratios increase deflection and shift failure modes from ductile (shear-compression) to brittle (shear-tension). Finally, the experimental shear capacities of the PCBSBs exceeded the predictions of the GB, ACI, EN, and CSA standards for beams with a/d ratios of 1.5 and 2.0. However, discrepancies were observed for beams with a/d of 3.0, where flexural behavior becomes more dominant. Based on these findings, a preliminary design recommendation was proposed. Further studies were recommended to investigate the performance of beams with shorter a/d ratios and varying dimensions to optimize connection efficiency.

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Stability and accuracy of central difference method for real-time dynamic substructure testing considering mass participation coefficient

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Earthquake Engineering and Engineering Vibration 2024年第3期23卷 625-636页

作者： Zheng Lichang Xu Guoshan Yang Ge Wang Zhen Yang Kaibo Zheng Zhenyun School of Civil Engineering Harbin Institute of TechnologyHarbin 150090China Key Lab of Structures Dynamic Behavior and Control Ministry of EducationHarbin Institute of TechnologyHarbin 150090China Key Lab of Intelligent Disaster Mitigation Ministry of Industry and Information TechnologyHarbin 150090China School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan 430070China

For real-time dynamic substructure testing(RTDST),the influence of the inertia force of fluid specimens on the stability and accuracy of the integration algorithms has never been ***,this study proposes to investigate the stability and accuracy of the central difference method(CDM)for RTDST considering the specimen mass participation ***,the theory of the CDM for RTDST is ***,the stability and accuracy of the CDM for RTDST considering the specimen mass participation coefficient are ***,numerical simulations and experimental tests are conducted for verifying the effectiveness of the *** study indicates that the stability of the algorithm is affected by the mass participation coefficient of the specimen,and the stability limit first increases and then decreases as the mass participation coefficient *** most cases,the mass participation coefficient will increase the stability limit of the algorithm,but in specific circumstances,the algorithm may lose its *** stability and accuracy of the CDM considering the mass participation coefficient are verified by numerical simulations and experimental tests on a three-story frame structure with a tuned liquid damper.

关键词： real-time dynamic substructure testing central difference method stability mass participation coefficient tuned liquid damper

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Effect of polymer-based self-healing agent on the gas permeability of cement mortar after compressive loading 11

Effect of polymer-based self-healing agent on the gas permea...

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11th International Workshop on Structural Health Monitoring 2017: Real-Time Material State Awareness and Data-Driven Safety Assurance, IWSHM 2017

作者： Du, Tao Yan, Ke-Ye Zhao, Sheng-Ying Li, Hui Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology 73 Huanghe Road Harbin Heilongjiang150090 China

ISBN: (纸本)9781605953304

Concrete is easily to crack due to its low tensile strength. Once harmful substances ingress through cracks, the service life of concrete will be endangered. The self-healing agent with a high healing efficiency and multiple autonomous is prepared based on pyrogallol and polyethylenimine. This self-healing agent is in liquid state, when the solution is exposed to air, there will be a film formed at the liquid/air interface. This film exhibited well regenerative properties which can be used to seal the cracks of concrete to reduce the risk of ingress of aggressive substances. In this paper, the ratio of the two components of the self-healing agent was investigated to achieve an optimization of strength and generation rate of this film. Then cement mortar specimens of ?100×50 mm are immersed in the self-healing agent under a vacuum environment to let the pores fill with self-healing agent. Thereafter, the discs are subjected to gas permeability test to exam the effects of self-healing agent on the permeability of cement mortar before and after compressive loadings. Results showed that this material can effectively reduce the gas permeability coefficient of cement mortar with micro cracks. Scanning electron microscopy (SEM) results also confirmed the crack barrier effect of this self-healing agent. Through several loading cycles, this self-healing agent also retained a certain self-healing effect in cement matrix, indicating that this self-healing agent appears to be a promising approach to increase concrete durability.

关键词： Cracks

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Predicting the capacity of perfobond rib shear connector using an ANN model and GSA method

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1233-1248页

作者： Guorui SUN Jun SHI Yuang DENG School of Civil Engineering Central South UniversityChangsha 410075China Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin 150090China National Engineering Laboratory for High-Speed Railway Construction Changsha 410075China

Due to recent advances in the field of artificial neural networks(ANN)and the global sensitivity analysis(GSA)method,the application of these techniques in structural analysis has become feasible.A connector is an important part of a composite beam,and its shear strength can have a significant impact on structural *** this paper,the shear performance of perfobond rib shear connectors(PRSCs)is predicted based on the back propagation(BP)ANN model,the Genetic Algorithm(GA)method and GSA method.A database was created using push-out test test and related references,where the input variables were based on different empirical formulas and the output variables were the corresponding shear *** results predicted by the ANN models and empirical equations were compared,and the factors affecting shear strength were examined by the GSA *** results show that the use of ANN model optimization by GA method has fewer errors compared to the empirical ***,penetrating reinforcement has the greatest sensitivity to shear performance,while the bonding force between steel plate and concrete has the least sensitivity to shear strength.

关键词： perfobond rib shear connector shear strength ANN model global sensitivity analysis

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An Adaptive Substructure-Based Model Order Reduction Method for Nonlinear Seismic Analysis in OpenSees

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Computer Modeling in Engineering & Sciences 2020年第7期124卷 79-106页

作者： Jian Wang Ming Fang Hui Li Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of TechnologyHarbin150090China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of TechnologyHarbin150090China College of Shipbuilding Engineering Harbin Engineering UniversityHarbin150001China.

Structural components may enter an initial-elastic state,a plastic-hardening state and a residual-elastic state during strong seismic *** the residual-elastic state,structural components keep in an unloading/reloading stage that is dominated by a tangent stiffness,thus structural components remain residual deformations but behave in an elastic *** has a great potential to make model order reduction for such structural components using the tangent-stiffness-based vibration modes as a reduced order *** this paper,an adaptive substructure-based model order reduction method is developed to perform nonlinear seismic analysis for structures that have a priori unknown damage *** method is able to generate time-varying substructures and make nonlinear model order reduction for substructures in the residual-elastic *** finite element program OpenSees has been extended to provide the adaptive substructure-based nonlinear seismic *** the low level of OpenSees framework,a new abstract layer is created to represent the time-varying substructures and implement the modeling process of *** the high level of OpenSees framework,a new transient analysis class is created to implement the solving process of substructure-based governing *** with the conventional time step integration method,the adaptive substructure-based model order reduction method can yield comparative results with a higher computational efficiency.

关键词： Adaptive substructure modeling model order reduction nonlinear seismic

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Creep behavior of reinforced concrete column in consideration of sectional stress redistribution

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Jianzhu Jiegou Xuebao/Journal of Building structures 2016年第5期37卷 264-272页

作者： Zheng, Wenzhong Tang, Can Liu, Yuchen Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

In order to investigate the effect of sectional stress redistribution on creep behavior of axial compressive concrete column, creep experiments were conducted on 12 groups of 100 mm×100 mm×400 mm concrete specimens under variable compressive stress. The effect of key parameters on the creep of reinforced concrete column and the sectional stress redistribution was investigated using the program edited by the MATlab software. The results show that the spring-back strain coefficient is 0.89 when the initial stress level is not larger than 0.35, and the initial stress level decreases with the increase of the initial stress level after the initial stress level is higher than 0.35. The ultimate creep value of axial compression reinforced concrete column decreases with the prolongation of the load age, the increase of longitudinal compression steel reinforcement ratio, section size and relative humidity, the decrease of concrete strength, initial stress level and temperature. The relations between the stable ultimate creep value of axial compression reinforced C20~C50 concrete column and each key parameters were fitted based on the simulation results. © 2016, Editorial Office of Journal of Building structures. All right reserved.

关键词： Axial compression

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A new multi-coefficients shrinkage model for concrete

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Jianzhu Cailiao Xuebao/Journal of Building Materials 2016年第5期19卷 826-831页

作者： Tang, Can Zheng, Wenzhong Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China

The contracting experiments were conducted on 69 concrete prisms, which include 5 different strength grades, 2 curing conditions, and 2 humidity environments, and experimental data of concrete shrinkage for 589d were accumulated. The influence coefficients of some factors on the shrinkage of concrete were obtained by normalization and fitting 588 experimental data collected from references. A new multi-coefficients shrinkage model for concrete was proposed based on the formula of influence coefficients and experimental data, which was suitable for the humidity from 10% to 100%, temperature from 5℃ to 80℃, theoretical thickness from 10mm to 500mm, curing time from 1d to 500d, cement content from 190kg/m3 to 500kg/m3, and water-cement ratio(by mass) from 0.35 to 0.70. The calculation results from proposed shrinkage model is agreed well with the experimental data. © 2016, Editorial Department of Journal of Building Materials. All right reserved.

关键词： Concretes

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Sublimation of composite ice and its influence on performance of ice shells

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International Journal of Space structures 2021年第1期36卷 67-77页

作者： Wu, Yue Huang, Junkai Chen, Jiafeng Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Harbin 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 China China Academy of Building Research Co. Ltd Beijing China

The long-span ice composite shell structure is a new type of ice and snow structure developed in recent years. The engineering practice of ice composite shell shows that sublimation is one of the important reasons for its damage and even collapse. In this paper, we firstly supplemented the existing H-K equation and obtained the revised ice sublimation equation through indoor evaporative plate experiment considering the influence of admixtures and wind speed. Afterwards, combining the simulations of solar radiation and CFD, the numerical simulation of sublimation distribution on the surface of were realized by programming in Grasshopper platform. During sublimation, the thickness of the ice composite shell decreases by 0.38 mm every 10 days and the sublimation rate on the sunny side was 1.7 times that on the shady side. Finally, the static performance and stability of the sublimated ice composite spherical shell were analyzed. After 70 days of sublimation, the thickness of the ice composite shell structure becomes thinner and uneven, which leads its sensitivity to external load increases. © The Author(s) 2021.

关键词： Ice

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