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SSRN 2023年

作者： Zhang, Xiaoyu Qiao, Jing Feng, Jingjing Xu, Shilang Zhou, Chunsheng Zeng, Qiang Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China College of Water Conservancy and Civil Engineering Shandong Agricultural University Taian271018 China College of Civil Engineering and Architecture Zhejiang University Hangzhou310058 China

Drying shrinkage of cement pastes (CPs) facilitating superficial cracking deserves primary concern when handling durability performance. In order to further clarify shrinkage mechanism, the changes of mass, length and pore water allocation of two mature CPs were monitored principally through non-destructive low-field NMR relaxation technique. Experimental results revealed that, heat treatment under hot water slightly coarsens the pore structure of CPs through modifying the morphology of C-S-H gel, but reduces shrinkage during first drying remarkably. During drying at 80% RH, although both interlayer and gel pores are saturated, they loss their water progressively at reducing rates. At the expense of reducing interlayer space, the contraction of gel pores is partly and even entirely compensated. When drying at lower 43% RH, interlayer pores still saturated are compacted more significantly with reducing size and volume. The compaction of interlayer pores is at the micro-structural origin and dominates drying shrinkage of CPs. © 2023, The Authors. All rights reserved.

关键词： Drying

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A coupled model for vortex induced vibration of a circular cylinder with and without passive-jet flow control

A coupled model for vortex induced vibration of a circular c...

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第八届国际振动工程会议

作者： Guanbin Chen Wenli Chen Donglai Gao Xiangwei Min Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology

A coupled dynamic equation model, consisted by two parts: structural dynamic equation and the improved van der Pol equation(IVDPE), is established to predict the vortex induced vibration(VIV) response of circular cylinder dipped in the fluid environment. A classical structural dynamic equation is applied to describe the one degree-of-freedom vibration of a circular cylinder. The improved van der Pol equation is used to model the wake flow dynamics and the fluctuating aerodynamic force derived from the periodic alternating vortex shedding. The complete frequency component of aerodynamic forces, vibration amplitude and lock-in domains can be successfully predicted by the present coupled dynamic equation model. In addition, the passive jet pipes equipped on the circular cylinder to form the jet flow to suppress the VIV through the experimental method. The aerodynamic forces acting on the different sections far away from the passive jet pipes was obtained by the digital pressure measurement system. The aerodynamic force changed by the passive jet flow is consider into the coupled dynamic equation, and then the update coupled model is constructed and can predict the VIV of the circular cylinder with different spacing of adjacent passive jet pipes.

关键词： vortex-induced vibration alternating vortex shedding coupled model passive jet flow

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Effects of Various Connectors on the Whole-Life-Cycle Energy Consumption of Sandwich Wall Panels in Five Thermal Zones of China

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SSRN 2022年

作者： Dong, Xianzhang Lu, Yiming Xiao, Huigang Liao, Juan School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education Harbin Institute of Technology Harbin150090 China China Construction Second Engineering Bureau. Ltd 100160 China

Connectors are not only an important mechanical component of sandwich wall panels (SWPs), but they also contribute to SWP energy loss because they penetrate thermal insulation layers. Reducing the energy consumption (EC) generated by connectors is critical for improving the energy-saving efficiency of SWPs throughout their life cycle. The mechanical and thermal parameters of connectors, structural layers, and insulation layers all have a coupling effect on the EC of connectors in the SWPs studied in this study. First, a connector diameter calculation model and a three-dimensional finite element (3-DFE) model were developed to investigate the mechanism of various connectors' effects on the thermal performance (TP) of SWPs with different structural and insulation layers. It was discovered that increasing the connector shear strength could reduce energy loss by reducing the connector size, and connector energy loss could also be improved by lowering the connector thermal conductivity and increasing the thermal resistance of the structural layers. Then, based on TP, a life cycle assessment (LCA) model was developed. Using five thermal zones in China as research subjects, it was discovered that the effects of connectors on the whole-life-cycle EC of SWPs depend on the value of degree days (DD). The connector manufacturing EC dominated the whole-life-cycle EC in an area with a low DD value. Reduced thermal conductivities of connectors, structural layers, and insulation layers could significantly improve the effects of connectors on the whole-life-cycle EC of SWPs in an area with a high value of DD. These findings are critical for the development of effective SWPs. © 2022, The Authors. All rights reserved.

关键词： Energy utilization

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Numerical investigation on prestressed shear key splice connections for onshore wind turbine foundations

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Engineering structures 2025年 339卷

作者： Zhang, Dongliang Liu, Wantong Wang, Fei Yu, Zhe Wu, Xiangguo Li, Tianhao Fu, Kun Magar, Anish Thapa Hwang, Hyeon-Jong Xian, Xiangping PowerChina Huadong Engineering Corporation Limited Hangzhou311122 China School of Civil Engineering Harbin Institute of Technology Harbin150090 China Department of Architecture and Civil Engineering City University of Hong Kong 83 Tat Chee Avenue Kowloon Tong999077 Hong Kong College of Civil Engineering Fuzhou University Fuzhou350108 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of the Industry and Information Technology Harbin Institute of Technology Harbin150090 China School of Architecture Konkuk University Seoul05029 Korea Republic of

Prestressed shear key splice connections are used for the assembly of prefabricated foundation modules in wind turbine towers. This study proposed a simplified section analysis to estimate the flexural moment strength of the shear key splice connections. The proposed method considered the structural deformation and unbonded prestressing tendon effect. Further, to investigate the effects of loading type, initial prestressing force, and shear span-to-depth ratio on the structural performance of the shear key splice connections, finite element analysis was performed on the precast segmental beams using the shear key splice connections. The section analysis results were compared to the finite element analysis results of the precast segmental beams under various initial prestressing forces, and the section analysis results agreed with the finite element analysis results. The shear span-to-depth ratio significantly affected the structural performance of the shear key splice connections. As the shear span-to-depth ratio decreased, the shear resistance increased because the failure mode changed from flexural failure due to the separated shear keys to direct shear failure of the shear keys. © 2025 Elsevier Ltd

关键词： Structural dynamics

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Fire resistance design of circular steel tube confined reinforced concrete columns 9

Fire resistance design of circular steel tube confined reinf...

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9th International Conference on Advances in Steel structures, ICASS 2018

作者： Yang, Hua Liu, Faqi Wang, Yuyin Zhang, Sumei 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 Ministry of Industry and Information Technology Harbin Institute of Technology Harbin China

ISBN: (纸本)9889914093

No study has been reported on fire performance of steel tube confined reinforced concrete (STCRC) columns. Hence fire behaviour of circular STCRC columns is investigated in this paper. Fire tests and numerical studies of circular STCRC columns are briefly introduced. Five full-scale specimens, including four circular STCRC columns and one CFST column, were tested to failure under combined thermal and mechanical loading. Temperatures across the section, displacement versus time curves and fire resistance of these columns were monitored and recorded. A finite element (FE) model was developed using the program ABAQUS, and validated against the test results. Based on test and FE results, a simplified design method was proposed for predicting fire resistance of circular STCRC columns exposed to ISO 834 standard fire condition. It was found that load ratio has significant influence on the fire resistance of circular STCRC columns. Compared with CFST columns and reinforced concrete columns, circular STCRC columns have higher fire resistance than the former and lower fire resistance than the latter. Copyright © 2018 by The Hong Kong Institute of Steel Construction.

关键词： Fire resistance

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Reliability Assessment of Offshore structures Using Subset Simulation with Adaptive Standard Deviation for Mmh Algorithm with Two-Stage Delayed Rejection

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SSRN 2023年

作者： Ma, Junming Lan, Chengming Guo, Anxin Li, Hui National Center for Materials Service Safety University of Science & Technology Beijing Beijing100083 China Research Institute of Urbanization and Urban Safety School of Civil and Resource Engineering University of Science & Technology Beijing Beijing100083 China Key Lab of Structures Dynamic Behavior and Control Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China

This paper explores modified strategies for MMH in the subset simulation for reliability assessment in ocean engineering. To improve the sampling efficiency in complex distributions comprising correlated or non-normal variables, this study proposes a modified approach involving a two-stage delayed rejection and an adaptive STD for the proposal distribution based on MMH. The acceptance rate of the candidate sample in two-stage delayed rejection approach is derived based on the reversibility condition of Markov chain to reduce the repeated samples. Additionally, the STD for all accepted samples is used as the STD for the proposal, which dominates the sampling scale and increases the acceptance rate. The Neal’s normal distribution, the Banana-shaped bivariate distribution, and the correlated joint distribution for wind and wave are adopted to study the sampling efficiency and ergodicity for MMHDR, AMMHDR, and AMMHDDR. Furthermore, three sampling algorithms are employed to generate conditional samples for estimating the probabilities of base shear failure and system failure in jacket platforms. The results indicate that the AMMHDDR can enhance the sampling efficiency, especially for complex distributions with correlated variables. Also, the AMMHDDR can be used in SS to improve the accuracy and reduce the variation when estimating failure probabilities of offshore structures. © 2023, The Authors. All rights reserved.

关键词： Normal distribution

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Cathode Potential Regulates the Microbiome Assembly and Function in Electrostimulated Bio- Dechlorination System

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SSRN 2022年

作者： Li, Zhi-Ling Cao, Di Shi, Ke Liang, Bin Zhu, Zhongli Liu, Wenzong Nan, Jun Sun, Kai Wang, Ai-Jie State Key Laboratory of Urban Water Resources and Environment School of Environment Harbin Institute of Technology Harbin150090 China Shenzhen518055 China Key Lab of Structures Dynamic Behavior and Control of China Ministry of Education School of Civil Engineering Harbin Institute of Technology Harbin150090 China

Mechanism of microbiome assembly and function driven by cathode potential in electro-stimulated microbial reductive dechlorination system remain poorly understood. Here, core microbiome structure, interaction, function and assembly regulating by cathode potential were investigated in a 2,4,6-trichlorophenol bio-dechlorination system. The highest dechlorination rate(24.30μM/d)was observed under-0.36Vwith phenol as a major end metabolite, while, lower (-0.56V) or higher (0.04Vor-0.16V)potentials resulted in 1.3~3.8 times decreased of dechlorination kinetic constant. The lower the cathode potential, the higher the generated CH4 , revealing cathode participated in hydrogenotrophic methanogenesis. Taxonomic and functional structure of core microbiome significantly shifted within groups of -0.36V and -0.56V, with dechlorinators ( Desulfitobacteriu , Dehalobacter ), fermenters ( norank_f_Propionibacteriaceae , Dysgonomonas )and cathode-utilizing methanogen ( Methanosarcina ) highly enriched, and the more positive interactions between functional genera were found. The lowest number of nodes and links and the highest positive correlations were observed among constructed sub-networks classified by function, revealing simplified and strengthened cooperation of functional genera driven by group of -0.36 V. Cathode potential plays one important driver controlling core microbiome assembly, and the low potentials drove the assembly of major dechlorinating, methanogenic and electro-active genera to be more deterministic, while, the major fermenting genera were mostly governed by stochastic processes. © 2022, The Authors. All rights reserved.

关键词： Dechlorination

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Structural stochastic responses determination via a sample-based stochastic finite element method

arXiv

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arXiv 2021年

作者： Zheng, Zhibao School of Civil Engineering Harbin Institute of Technology Harbin150090 China Key Lab of Structures Dynamic Behavior and Control Harbin Institute of Technology Ministry of Education Harbin150090 China

This paper presents a new stochastic finite element method for computing structural stochastic responses. The method provides a new expansion of stochastic response and decouples the stochastic response into a combination of a series of deterministic responses with random variable coefficients. A dedicated iterative algorithm is proposed to determine the deterministic responses and corresponding random variable coefficients one by one. The algorithm computes the deterministic responses and corresponding random variable coefficients in their individual space and is insensitive to stochastic dimensions, thus it can be applied to high dimensional stochastic problems readily without extra difficulties. More importantly, the deterministic responses can be computed efficiently by use of existing Finite Element Method (FEM) solvers, thus the proposed method can be easy to embed into existing FEM structural analysis softwares. Three practical examples, including low-dimensional and high-dimensional stochastic problems, are given to demonstrate the accuracy and effectiveness of the proposed method. Copyright © 2021, The Authors. All rights reserved.

关键词： Random variables

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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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Damage Detection of Transmission Tower Based on Stochastic Subspace and Statistic Model 3

Damage Detection of Transmission Tower Based on Stochastic S...

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3rd International Conference on Environmental Prevention and Pollution control Technologies, EPPCT 2021

作者： Xingjie, Wang Tingting, Yang Meigen, Cao Chong, Zheng Wensong, Zhou Yutong, Pang Wenzhou Power Supply Company of State Grid Zhejiang Province Wenzhou330300 China Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Heilongjiang Province Harbin150090 China Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters Ministry of Industry and Information Technology Harbin Institute of Technology Heilongjiang Province Harbin150090 China School of Civil Engineering North China University of Technology Beijing100144 China

During the long service period of the transmission tower, the severe environment, material aging and fatigue effects result in the damage accumulation and resistance fading of the transmission tower, which even lead to the structural failure. In this paper, a stochastic subspace-based damage detection algorithm combined with statistical model is proposed for the damage identification of transmission tower structures through processing and analysing its vibration signals. Based on the structural modal parameters identified from the structural vibration response, the nominal modal parameters are defined. Considering that the Hankel matrixes constructed by the system observability matrix and the system output covariance matrix have the same kernel space, the damage index sensitive to the modal parameters is constructed. In the manuscript, firstly, the damage index establishment method and process of the algorithm are presented;and then the vibration data of transmission tower structure simulation under different damage conditions are obtained through numerical simulations;finally, above data are analysed to obtain the damage identification results of transmission tower. The results show that the method proposed in this work can effectively identify the local damage of transmission tower structure. © Published under licence by IOP Publishing Ltd.

关键词： Stochastic systems

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