检索结果-内蒙古大学图书馆

Study on the Eccentric Compression Performance of Stiffened Square CFST

IOP Conference Series: Earth and Environmental Science 2019年第1期218卷

作者： Xinzhi Zheng Zhixiang Zhou Shuang Zheng Taotao Wang Post-doctoral research station of civil engineering Chongqing Jiaotong University Chongqing 40074 China Henan engineering laboratory of ecological architecture and environment construction Henan Polytechnic University Jiaozuo 454000 China Institute of bridge detection and reinforcement technology Huanghe Jiaotong University Jiaozuo 454950 China School of civil Engineering Zhengzhou Institute of Technology Zhengzhou 450044 China.

Concrete-filled steel tubular columns (CFST) have high bearing capacity, high stiffness and good ductility. The columns with square or rectangular section are more suitable for compression bending than round. However, its lateral binding force is small in the middle of the section, and local buckling is easy to occur. Stiffened Square Concrete Filled Steel Tubular columns (SSCFST) are proposed to solve the problem that ordinary square concrete filled steel tubular columns(SCFST) are prone to appear local buckling before reaching the limits of carrying capacity in 3 cases such as the thinner steel tube wall, the larger diameter to thickness ratio or width to thickness ratio. SSCFST are SCFST added with stiffening ribs, stiffening hoops and binding bars. By its set, the lateral stiffness and the resistance ability of the local buckling of the steel tube are effectively enhanced, so the confinement effects of the steel tube to core concrete become stronger and more uniform. To compare the improved effects of SSCFST and SCFST with binding bars under eccentric compression, the paper compiles the solving procedure of the cross section grid unit method which can accurately solve the whole process curve of SSCFST under eccentric compression. The whole process curves show that the eccentric bearing capacity and ductility of SSCFST are obviously improved with respect to SCFST with binding bars.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Study on the Eccentric Compression Performance of Stiffened Rectangular CFST

引用

IOP Conference Series: Earth and Environmental Science 2019年第1期218卷

Concrete-filled steel tubular columns (CFST) have high bearing capacity, high stiffness and good ductility. The columns with rectangular section are more suitable for compression bending than round. However, its lateral binding force is small in the middle of the section, and local buckling is easy to *** Rectangular Concrete Filled Steel Tubular columns(SRCFST) are proposed to solve the problem that ordinary rectangular concrete filled steel tubular columns(RCFST) are prone to appear local buckling before reaching the limits of carrying capacity in 3 cases such as the thin steel tube wall, the larger diameter to thickness ratio or width to to thickness ratio. SRCFST are RCFST added with stiffening ribs, stiffening hoops and binding bars. By its set, the latera stiffness and the resistance ability of the local buckling of the steel tube are effectively enhanced, so the confinement effects of the steel tube to core concrete become stronger and more uniform. To compare the improved effects of SRCFST and RCFST with binding bars under eccentric compression, the paper compiles the solving procedure of the cross section grid unit method which can accurately solve the whole process curve of SRCFST under eccentric compression. The whole process curves show that the eccentric bearing capacity and ductility of SRCFST are obviously improved with respect to RCFST with binding bars.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Damage modes and failure mechanism of 160,000 m3 lng outer concrete tank under impact loading 9th

Damage modes and failure mechanism of 160,000 m3 lng outer c...

引用

9th International Structural engineering and construction Conference: Resilient Structures and Sustainable construction, ISEC 2017

作者： Zhai, Ximei Zhao, Xinyu Li, Xinrui School of Civil Engineering Harbin Institute of Technology Harbin City China Zhe Jiang Electric Power Construction Co. Ltd Ningbo City China

ISBN: (纸本)9780996043748

In order to investigate the damage models and failure mechanism of the outer concrete tank of the liquefied natural gas (LNG) storage tank under impact loading, the finite element (FE) model of the outer concrete tank of 160,000 m3 LNG storage tank for an actual LNG project and a cylindrical impactor are established based on ANSYS/LS-DYNA FE analysis software platform. Through the result comparison of the numerical simulation and an impact perforation test of reinforced concrete slabs subjected to projectile with high speed, the accuracy of the numerical simulation method and material model proposed from this paper are verified. The dynamic response of the concrete dome for LNG outer concrete tank structures under impact loading is studied. Based on response rules and failure phenomena of the dome for LNG outer concrete storage tank subject to impact loading, three damage modes are defined, and the failure mechanism for each mode is revealed from the view point of energy. Copyright © 2017 ISEC Press.

关键词： Dynamic response

来源：评论

学校读者我要写书评

暂无评论

Sustainable business models: a review

arXiv

引用

arXiv 2019年

作者： Nosratabadi, Saeed Mosavi, Amir Shamshirband, Shahaboddin Zavadskas, Edmundas Kazimieras Rakotonirainy, Andry Chau, Kwok Wing Institute of Business Studies Szent Istvan University Godollo Hungary Institute of Automation Kando Kalman Faculty of Electrical Engineering Obuda University 1034 Budapest Hungary School of the Built Environment Oxford Brookes University Oxford United Kingdom Faculty of Information Technology Ton Duc Thang University Ho Chi Minh City Viet Nam Department for Management of Science and Technology Development Ton Duc Thang University Ho Chi Minh City Viet Nam Institute of Sustainable Construction Vilnius Gediminas Technical University VilniusLT-10223 Lithuania Queensland University of Technology Institute of Health and Biomedical Innovation 60 Musk Avenue Kelvin GroveQLD4059 Australia Department of Civil and Environmental Engineering Hong Kong Polytechnic University Hung Hom Hong Kong

During the past two decades of the e-commerce growth the concept of business model has become increasingly popular. More recently, the research on this realm has grown rapidly with a diverse research activity covering a wide range of application areas. Considering the sustainable development goals the innovative business models have brought a competitive advantage to improve the sustainability performance of organizations. The concept of the sustainable business model describes the rationale of how an organization creates, delivers, and captures value, in economic, social, cultural or other contexts in a sustainable way. The process of sustainable business model construction forms an innovative part of business strategy. Different industries and businesses have utilized sustainable business models’ concept to satisfy their economic, environmental and social goals simultaneously. However, the success, popularity, and the progress of sustainable business models in different application domains are not clear. To explore this issue, this research provides a comprehensive review of sustainable business models literature in various application areas. Notable sustainable business models are identified and further classified in fourteen unique categories, and in every category, the progress -either failure or success- has been reviewed and the research gaps are discussed. Taxonomy of the applications includes innovation, management and marketing, entrepreneurship, energy, fashion, healthcare, agri-food, supply chain management, circular economy, developing countries, engineering, construction and real estate, mobility and transportation, and hospitality. The key contribution of this study is to provide an insight into the state of the art of sustainable business models in various application areas and future research directions. This paper concludes that popularity and the success rate of sustainable business models in all application domains have been increased along with

关键词： Sustainable development

来源：评论

学校读者我要写书评

暂无评论

Investigation of disturbed rock zones in open-pit mine walls by seismic tomography

引用

Key engineering Materials 2017年 755卷 147-152页

作者： Melnikov, N.N. Mesyats, S.P. Ostapenko, S.P. Cherepetskaya, E.B. Shibaev, I.A. Morozov, N.A. Kravcov, A.N. Konvalinka, A. Establishment of RAS Mining Institute Fersman str Apatity184209 Russia National University of Science and Technology Leninsky pr.6 Moscow119991 Russia Department of Construction Technology Faculty of Civil Engineering in Prague Thákurova 7/2077 Prague16629 Czech Republic

The paper presents the results of measurements of compressional and shear wave velocities in the near-surface zone in the Zhelezny open pit mine, the Kovdor GOK (Kovdor Mineral Producing and Processing Company). Data on the seismic wave velocities are used to estimate Young's modulus and Poisson's ratio. Poisson's ratios derived from the compressional-toshear velocity ratios are used to locate fractures that are due to stress redistribution and weathering processes in the stepped walls of the open pit mine. © 2017 Trans Tech Publications, Switzerland.

关键词： Shear waves

来源：评论

学校读者我要写书评

暂无评论

Study on technology of Surface Pre-grouting for Vertical Shaft in Broken and Water-rich Granite Strata of Gaoligong Mountain Tunnel of Dali-Ruili Railway

引用

IOP Conference Series: Earth and Environmental Science 2019年第1期218卷

作者： Hua Wang Zhenguo Chen Shujie Liu Min Liang Mine Construction Branch China Coal Research Institute Beijing 100013 China Beijing China Coal Mine Engineering Company Co. Ltd. Beijing 100013 China College of Civil Engineering Anhui Jianzhu University Hefei 230601 China School of Civil and Environment Engineering University of Science and Technology Beijing Beijing 100083 China China Coal Technology & Engineering Group Beijing 100013 China.

The Gaoligong Mountain Tunnel of Dali-Ruili Railway is located between the Nujiang River and the Longling County Town in the southeastern section of the Hengduan Mountains, China. In geological history, this area was affected by multiple tectonic movements, and the faulted structures are extremely developed. During the drilling inspection hole of No.2 vertical shaft, boring tool stuck and the hole collapse once happened. Its depth was 643.12 m, the outcropped strata were all granite or weathered granite (fracture zones). 7 fracture zones with thickness > 10 m were uncovered, the maximum thickness of which was 112.95 m; and 7 water bearing strata were uncovered, of which the buried depth of groundwater table was all less than 34m, the permeability coefficients(k) were 0.005~0.158 m/d. It was estimated that the water inflow of ④ ~ ⑦ aquifers of the main shaft and the auxiliary shaft of No. 2 shaft were all greater than 120 m3/d (5 m3/h), that normal water inflow of main shaft and auxiliary shaft of No.2 vertical shaft would be 125.92 m3/h and 90.08 m3/h respectively. In order to avoid water inrush and wall caving accidents during the construction of the two shafts, it was decided to adopt the surface pre-grouting method in the construction of the shafts to block off and reinforce the ④ aquifer and the strata under the aquifer. The 'S' shaped directional drilling technology was used; the two sequences, segmented downward, multiple-times grouting mode was adopted; clay-cement slurry was selected as the grouting material. After grouting, pump yield water tests were carried out in two grouting holes of main shaft and auxiliary shaft. The remaining water inflow in grouting sections of two shafts was 5.02 m3/h and 5.70 m3/h respectively, and the rates of water blocking were all over 93%. The grouting effect was remarkable. The successful implementation of the surface pre-grouting project of No.2 vertical shaft in Gaoligong Mountain Tunnel of Dali-Ruili Railway has important

关键词：

来源：评论

学校读者我要写书评

暂无评论

A study on mechanism of simulated red asphalt modified asphalt based on molecular dynamics

Boletin Tecnico/Technical Bulletin

引用

Boletin Tecnico/Technical Bulletin 2017年第13期55卷 624-632页

作者： Bao, Huiming Fu, Tao College of Civil and Construction Engineering Guilin University of Technology Guilin541004 China

In order to study the modification mechanism of red mud-asphalt, the asphalt was divided into asphaltene, saturate and aromatic by introducing molecular simulation technology. A typical molecular model was used to represent each component of asphalt. The asphalt molecular model was constructed. Hematite and Fe-Al garnet were used to represent the red mud structure. The asphalt-hematite model and the asphalt-iron-aluminum garnet model were simulated by molecular dynamics method,to obtain the microcosmic mechanism of asphalt. The results show that the tectonic energy of the asphalt-hematite molecular system is more torsional energy, which indicates that the surface activity of the asphalt molecules in the hematite is more intense than that of the asphalt-iron-aluminum garnet, which also reflects the Hematite surface has a greater activity;and asphalt-iron-aluminum garnet molecular system changes in the larger range is van der Waals, mineral surface geometry constraints and surface charge effects, resulting in a easier diffusion when asphalt is in the hematite mineral surface and the radial distribution function shows that the aggregation of asphalt on iron-aluminum garnet is more obvious than that of asphalt in hematite.

关键词： Molecular dynamics

来源：评论

学校读者我要写书评

暂无评论

Improving the Performance of Light Pipe System Using Laser Cut Panel

引用

Journal of Physics: Conference Series 2019年第1期1150卷

作者： Aslila Abd Kadir Lokman Hakim Ismail Narimah Kasim Izudinshah Abd Wahab Masiri Kaamin Norhayati binti Ngadiman Mohd Shafiq Bin Mohd Rosli Department of Civil Engineering Centre For Diploma Studies Universiti Tun Hussein Onn Malaysia Malaysia. Department of Design Engineering And Architecture Faculty of Civil and Environmental Engineering Universiti Tun Hussein Onn Malaysia Malaysia. Department of Construction Management Faculty of Technology Management and Business Universiti Tun Hussein Onn Malaysia Malaysia.

Light pipe systems (LPS) are simple devices that allow the transmission of daylight into interiors of buildings. It is a convenient concept for illumination of windowless parts of buildings. The light performance of this is highly dependent on the solar altitude due to the small inlet aperture. Placing the laser-cut panel (LCP) at the entrance aperture in light pipe system, will increase the light performance during low solar angle. This paper presents the results of light performance a 400mm diameter light pipe integrated with a laser-cut panel at entrance aperture as collector. For that reason, this research adopted an experimental approach to compare the light pipe performance via 1:10 scale model. Two scale models were built. LCP in the form of pyramids was fitted at the entrance aperture of light pipe in different tilted angle 40° and 47.5°. The system has been monitored 30 minutes interval with lux meter to evaluate the improvement light performance on a working plane for 6 days under good sky condition. The results of this experiment shows that LCP with 40° tilted angle performed better than 47.5° tilted angle. The light pipe with LCP as collector the minimum recommended illuminance by Malaysian Standard (MS) 1525:2007 can be achieved as early at 8am.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Respect for people's well-being: Meditation for construction workers 26

Respect for people's well-being: Meditation for construction...

引用

26th Annual Conference of the International Group for Lean construction: Evolving Lean construction Towards Mature Production Management Across Cultures and Frontiers, IGLC 2018

作者： Filho, João Bosco Pinheiro Dantas De Paula Barros Neto, José Mourão, Alexandre Da Rocha, Andréa Benício VieiraLuccas, Andre Saggin, Angela Federal Institute of Education Science and Technology of Ceará Researcher of GERCON Federal University of Ceará Fortaleza Brazil Department of Structural Engineering and Civil Construction Leader of the GERCON Federal University of Ceará Fortaleza Brazil Technical Director of C. RolimEngenharia Ltda. Brazil Espaço Tenda Fortaleza Brazil Researcher of GERCON Fortaleza Brazil Lean and Green Coordinator of C. RolimEngenharia Ltda. Brazil

ISBN: (纸本)9789380689296

Stressful environments are often found in construction industry which makes important to study the relation between stress and work. Alcohol or illicit drugs were reported to be common short-term alternatives to reduce anxiety in male-dominated industries and have long-term implications for health and well-being. "What countermeasures can be used by construction workers?" A set of emotion-focused coping strategies is identified, such as physical exercise, recreational activities and meditation. According to the Brazilian Ministry of Health, meditation is an instrument of physical, emotional, mental, social and cognitive strengthening that promotes concentration, stimulates well-being, relaxation, reduces stress, hyperactivity and depressive symptoms. "But would construction workers be willing to meditate?" The purpose of this paper is to assess the initial perceptions of construction workers under meditation training. This research has a qualitative approach and its strategy is a unique case study. Four meditation sessions were applied at the construction site during lunch break. Multiple sources of evidence were used: interviews and videos. The data analysis was qualitative. The results indicate: (1) construction workers consider that meditation values them and (2) they also recommend its implementation. This research gives some information that there is viability for meditation in construction. © IGLC 2018 All Rights Reserved.

关键词： Health

来源：评论

学校读者我要写书评

暂无评论

Finite element analysis of plane frame systems with different models of semi-rigid connections

引用

IOP Conference Series: Materials Science and engineering 2020年第2期962卷

作者： Tran Thi Thuy Van Ngo Dinh Tung Nguyen Trung Kien Hanoi Architectural University Civil Engineering Faculty Km.10 Nguyen Trai Thanh Xuan Hanoi Vietnam SCG Joint Stock Construction Company 8th floor of 16 Sunshine Centre Namtuliem Hanoi Vietnam Vietnam Institute for Building Science and Technology Institute of Building Structures 81 Tran Cung Cau Giay Hanoi Vietnam

Today, in the current Vietnamese design standards for semi-precast reinforced concrete and steel frame structural systems, the connections of main elements such as beams and columns are commonly considered as either perfectly hinged or rigidly fixed. This assumption is adopted because of the simplicity in design and analysis process but it is not consistent with actual behaviour in practice of structural systems. The connections between columns and beams have partial restraint depending on the type of used connection. The analysis of structural system with consideration of the effect of this restraint would result more exactly and economically. However, it is also more time required because of complexity of analysis process with consideration of flexibility of connections in the case of lack of suitable calculation method. The paper presents the analysis of plane frame systems with different of models of semi-rigid connections using finite element method. The analysis process was implemented by MathCad programming software and the results of this study will obtained by conducting of numerical examples. From there the conclusions and recommendation of calculation and design for steel and semi-precast frame systems will be proposed.

关键词：

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：