检索结果-内蒙古大学图书馆

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

来源：评论

学校读者我要写书评

暂无评论

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

arXiv

引用

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

来源：评论

学校读者我要写书评

暂无评论

Effects of cooking oil on the shrinkage-reducing of high-strength concrete

Results in Materials

引用

Results in Materials 2024年 23卷

作者： Huo, Yanlin Dong, Xinhong Gao, Yang Xu, Xiaodong Zeng, Liang Wu, Yuanchao Zhao, Yunhui Yang, Yingzi Su, Qunshan Huang, Jinguang Lu, Dong School of Civil Engineering Harbin Institute of Technology Key Lab of Structures Dynamic Behavior and Control of the Ministry of Education Harbin Institute of Technology Key Lab of Smart Prevention and Mitigation of Civil Engineering Disasters of the Ministry of Industry and Information Technology Harbin Institute of Technology Postdoctor Workstation Henan D.R. Construction Group Research and Development Center Henan Qingshui Construction Technology Co. Ltd.

Autogenous shrinkage is a serious problem for high-strength concrete, which may lead to early-age cracking. Shrinkage-reducing agents are typically used to mitigate the autogenous shrinkage of concrete. However, some negative effects, such as unstable workability and the reduction of compressive strength, will be caused. In this study, emulsified or plain cooking oil is used as a shrinkage-reducing agent in low water-binder ratio concrete. Deformational behaviours of concrete with cooking oil and normal commercially available shrinkage-reducing agent are investigated. Experimental results show that the utilization of cooking oil could significantly reduce the autogenous shrinkage of high-strength concrete due to the reduction of surface tension. Additionally, emulsified cooking oil is better than normal shrinkage-reducing agents and plain cooking oil in many aspects of the concrete. Micro-structure of the concrete with different shrinkage-reducing agents is also observed. Emulsified cooking oil is considered a promising admixture for the mitigation of autogenous shrinkage of high-strength concrete. © 2024 The Authors

关键词： Autogenous shrinkage Cooking oil High strength concrete Shrinkage reducing agent

来源：评论

学校读者我要写书评

暂无评论

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

SSRN

引用

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

来源：评论

学校读者我要写书评

暂无评论

Risk assessment of spatially distributed assets with generalized seismic fragility models based on machine learning

引用

Soil dynamics and Earthquake Engineering 2025年 198卷

作者： Jia-Wei Ding Da-Gang Lu Zheng-Gang Cao Key Lab of Structural Dynamic Behaviors and Control of the Ministry of Education Harbin Institute of Technology Harbin 150090 China

Urban areas consist of a diverse array of spatially distributed assets, encompassing both infrastructure systems and portfolio buildings, both of which are crucial to enhancing the sustainability and resilience of urban. Addressing the seismic risk within such settings requires a nuanced approach that considers the spatial distribution of assets and the correlation among ground motion intensity measures (GMIMs). This study undertakes finite element modeling of different structural types. Recognizing the distinct sensitivities of GMIMs to these structural types, 5 machine learning (ML) methods are implemented to construct prediction models for seismic responses based on 24 GMIMs. The generalized fragility model and vulnerability model are developed for different structural types. Moreover, the spatial cross-correlation of 24 GMIMs is integrated into a loss assessment framework using geostatistical techniques and principal component analysis. A virtual city is taken as a case study, demonstrating that the generalized fragility model based on ML enhances the accuracy of regional loss assessment and improves traffic connectivity reliability compared to traditional fragility models that consider a single GMIM. In summary, this study presents a comprehensive framework for regional seismic risk assessment, leveraging ML alongside spatial analysis to enhance prediction accuracy and reliability, thus offering valuable insights for urban planning and disaster mitigation efforts.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Efficient structural seismic performance evaluation method using improved endurance time analysis

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

arXiv

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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

来源：评论

学校读者我要写书评

暂无评论

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

引用

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.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Local buckling of stainless steel stub columns with novel octagonal hollow sections

引用

Engineering structures 2025年 338卷

作者： Zhong, Yukai Jiang, Ke Chen, Man-Tai Su, Andi Zhao, Ou Research Center for Wind Engineering and Engineering Vibration Guangzhou University Guangzhou China School of Civil and Environmental Engineering Nanyang Technological University Singapore Department of Civil and Natural Resources Engineering University of Canterbury Christchurch New Zealand State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai200240 China Shanghai Key Laboratory for Digital Maintenance of Buildings and Infrastructure Department of Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Key Lab of Structures Dynamic Behaviour 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

Octagonal hollow section, a novel type of polygonal hollow sections, combines the advantages of traditional circular and rectangular hollow sections while mitigating their limitations, with higher load-carrying capacities over rectangular hollow sections due to smaller plate element widths and better constructability over circular hollow sections owing to multiple flat faces providing operation platforms for welded and bolted connections. The present paper reports experimental and numerical studies on the local buckling behaviour of stainless steel octagonal hollow sections under axial compression. The testing programme included axial compression tests on fifteen stainless steel octagonal hollow section stub column specimens with five different outer cross-section dimensions and three different wall thicknesses, as well as tensile coupon tests and initial local geometric imperfection measurements. In parallel with the testing programme, a numerical modelling programme was carried out, with finite element models developed and validated against the test results and afterwards adopted to carry out parametric studies. The test and numerical data were used to evaluate the applicability of relevant design rules, as specified in the European code, American specification and ASCE standard, to stainless steel octagonal hollow sections. The evaluation results generally revealed that (i) the three sets of codified slenderness limits were unsafe when used for cross-section classification of stainless steel hexagonal hollow sections, (ii) the European code and American specification resulted in overall accurate and consistent cross-section compression resistance predictions for stainless steel octagonal hollow sections, but still with some overly conservative predictions for non-slender cross-sections and slightly unsafe predictions for those at the boundary of non-slender and slender cross-sections, and (iii) the ASCE standard provided overall scattered and inaccurate cross-sec

关键词： Welding codes

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：