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Analysis on the Causes of Cracks in Concrete Structure Engineering and Its Prevention and Treatment Technology 认领 引用
1
作者 JIANGYun 《外文科技期刊数据库（文摘版）工程技术》 2022年第5期013-018,共6页
It is not difficult to find out that cracks in concrete structural engineering are ubiquitous. Because the damage of the structure often begins with cracks, it brings harm and risk to social production and life. Espec... It is not difficult to find out that cracks in concrete structural engineering are ubiquitous. Because the damage of the structure often begins with cracks, it brings harm and risk to social production and life. Especially with the rapid development of my country's capital construction in recent decades, it is very necessary to understand and solve the ancient and novel problem of cracks in concrete structures. With the exploration and research of long-term engineering practice, with the continuous development of technology and productivity, people have realized that the generation of harmful cracks can be controlled through effective technical means. That is to say, through the organic combination of design and construction, the influence of cracks can be prevented from being harmful. 展开更多
关键词 cracks in concrete structure engineering prevention means repair scheme
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Deep Learning-Based Automatic Detection and Evaluation on Concrete Surface Bugholes 认领 引用 被引量：1
2
作者 Fujia Wei Liyin Shen +3 位作者 Yuanming Xiang Xingjie Zhang Yu Tang Qian Tan 《Computer Modeling in Engineering & Sciences》 SCIE EI 2022年第5期619-637,共19页
Concrete exterior quality is one of the important metrics in evaluating construction project quality.Among the defects affecting concrete exterior quality,bughole is one of the most common imperfections,thus detecting... Concrete exterior quality is one of the important metrics in evaluating construction project quality.Among the defects affecting concrete exterior quality,bughole is one of the most common imperfections,thus detecting concrete bughole accurately is significant for improving concrete exterior quality and consequently the quality of the whole project.This paper presents a deep learning-based method for detecting concrete surface bugholes in a more objective and automatic way.The bugholes are identified in concrete surface images by Mask R-CNN.An evaluation metric is developed to indicate the scale of concrete bughole.The proposed approach can detect bugholes in an instance level automatically and output the mask of each bughole,based on which the bughole area ratio is automatically calculated and the quality grade of the concrete surfaces is assessed.For demonstration,a total of 273 raw concrete surface images taken by mobile phone cameras are collected as a dataset.The test results show that the average precision(AP)of bughole masks is 90.8%. 展开更多
关键词 Defect detection engineering concrete quality deep learning instance segmentation
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Comparison of Coarse Graining DEM Models Based on Exact Scaling Laws 认领 引用 被引量：3
3
作者 Bin Zhang Yiming Huang Tingting Zhao 《Computer Modeling in Engineering & Sciences》 SCIE EI 2021年第6期1133-1150,共18页
The simulation of a large number of particles requires unacceptable computational time that is the most criticalproblem existing in the industrial application of the DEM. Coarse graining is a promising approach to fac... The simulation of a large number of particles requires unacceptable computational time that is the most criticalproblem existing in the industrial application of the DEM. Coarse graining is a promising approach to facilitatethe application of DEM to industrial problems. While the current coarse graining framework is often developedin an ad-hoc manner, leading to different formulations and different solution accuracy and efficiency. Therefore,in this paper, existing coarse graining techniques have been carefully analysed by the exact scaling law which canprovide the theory basis for the upscaling method. A proper scaling rule for the size of particles and samples as wellas interaction laws have been proposed. The scaling rule is applied to a series simulations of biaxial compressiontests with different scale factors to investigate the precision of the coarse graining system. The error between theoriginal system and the coarse system shows a growing tendency as the scale factor increases. It can be concludedthat the precision of the coarse graining system is accepted when applying scaling rules based on the exact scalinglaws. 展开更多
关键词 Discrete element method coarse graining exact scaling scale laws
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Research on Evaluation System of Green Residential Buildings in Cold Areas of Sichuan 认领 引用
4
作者 Bin Cheng Cong Liu 《Journal of Building Construction and Planning Research》 2020年第2期93-118,共26页
With regard to the rapid growth of China’s building area and the increasing energy consumption of buildings, green buildings have become an important issue for balancing economic development and environmental impact.... With regard to the rapid growth of China’s building area and the increasing energy consumption of buildings, green buildings have become an important issue for balancing economic development and environmental impact. However, the current evaluation systems for various types of green buildings are often unable to achieve a set of standards in practice due to the distinct regional characteristics of each region. Therefore, in view of the regional characteristics of the climate, terrain, ecology, and economic development in the cold regions of Sichuan, it is important to study the evaluation system of green residential buildings suitable for the cold regions of Sichuan. This article focuses on the regional characteristics of climate, topography, ecology, and economic development in the cold regions of Sichuan, and discusses the limitations of the current standards on the practice of green building in cold regions of Sichuan through a sociological questionnaire survey on the comfort of living in the local population. Then from the two dimensions of the advantages of traditional houses and the particularity of national culture, the strategies for the optimization and improvement of the evaluation index system for green residential buildings in the cold regions of Sichuan were proposed. After comprehensively considering the factors that affect the green residential buildings, including the regional characteristics of the cold regions of Sichuan, and the green performance of buildings, local characteristics and ethnic features were included in the evaluation system. The evaluation index system of green residential buildings in the cold regions of Sichuan, consists of 92 three-level indicators. A professional hierarchical analysis software yaahp was used to establish a multi-level hierarchical model between the indicators, and the indicators were compared with each other layer by layer to clarify the importance of the indicators. Based on this, a judgment matrix for each layer was constructed and obtained. The weight of each indicator is accurate, and the scoring mechanism and grading standards are constructed according to it. Through the calculation, the consistency test of the entire model was passed, thereby confirming the scientificity and rationality of the entire evaluation system. 展开更多
关键词 Green Building Evaluation System Gold Area Context Local Standards of Si-chuan Province Residential Building
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Design and Construction Strategy of Arched Continuous Rigid-frame Bridge 认领 引用
5
作者 Yueqi Gao 《Journal of World Architecture》 2021年第1期5-7,共3页
With the current rapid development of urbanization in China,people's living standards have been greatly improved.In the context of such a development background,the requirements for road traffic are getting more s... With the current rapid development of urbanization in China,people's living standards have been greatly improved.In the context of such a development background,the requirements for road traffic are getting more stringent,especially for bridge projects.The arched continuous rigid-frame bridge was developed under this social background.The advantage of the bridge lies in the design of a bridge model that integrates various functions such as transportation,landscape,and sightseeing.Based on the above,this paper first refers to the case to analyze the design and construction strategy of the arched continuous rigid-frame bridge,in hope of providing a valuable reference for relevant personnel. 展开更多
关键词 Arch Continuous steel structure Bridge design Construction
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Analysis of Applications of Green Concept in Architectural Design 认领 引用
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作者 LIUGang LIJiubo 《外文科技期刊数据库（文摘版）工程技术》 2022年第2期019-022,共4页
At this stage, with the application of advanced science and technology and the continuous progress of social civilization, people's awareness of green environmental protection is getting stronger and stronger, whi... At this stage, with the application of advanced science and technology and the continuous progress of social civilization, people's awareness of green environmental protection is getting stronger and stronger, which in turn puts forward higher requirements for living environment and conditions. With the continuous development of urbanization, the scale and quantity of construction projects are gradually increasing, and the green concept has been attached importance to and applied in architectural design. This paper first discusses the concept and application significance of the green concept, puts forward the specific application principles of the green concept, and studies the architectural layout and design, so as to promote the rational application of the green concept in architectural design and provide people with a green and environment-friendly living and office environment. 展开更多
关键词 green concept architecture design application
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Ecological Restoration Design in Landscape Planning and Design of Urban River Regulation 认领 引用
7
作者 DUJing DINGWanxin GAOLuoqiu 《外文科技期刊数据库（文摘版）工程技术》 2022年第5期133-137,共5页
Under the background of the gradual improvement of urban economic level, urban construction has gradually stepped onto the historical stage. Urban construction has an important relationship with urban mental outlook a... Under the background of the gradual improvement of urban economic level, urban construction has gradually stepped onto the historical stage. Urban construction has an important relationship with urban mental outlook and social residents living conditions. In the urban construction work, the planning and design of river regulation landscape is an important work content. In the case of advocating the green ecological concept in China, the city government needs to pay attention to the urban construction work. This paper briefly describes the basic functions of river courses and the basic contents of ecological restoration design, and describes the design technology of river courses under the concept of ecological restoration design. Taking City A as an example, it explains the relevant links of landscape planning and design of urban river courses, so as to improve urban river courses. 展开更多
关键词 river regulation landscape planning ecological restoration design
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Research on expansion joint for high-speed railway long-span bridges in China 认领 引用 被引量：4
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作者 Hui Guo Jinzhou Jiang +8 位作者 Suoting Hu Chun Yang Qiqi Xiang Kou Luo Xinxin Zhao Bing Li Ziquan Yan Liubin Niu Jianye Zhao 《Railway Sciences》 2025年第1期52-81,共30页
Purpose–The bridge expansion joint(BEJ)is a key device for accommodating spatial displacement at the beam end,and for providing vertical support for running trains passing over the gap between the main bridge and the... Purpose–The bridge expansion joint(BEJ)is a key device for accommodating spatial displacement at the beam end,and for providing vertical support for running trains passing over the gap between the main bridge and the approach bridge.For long-span railway bridges,it must also be coordinated with rail expansion joint(REJ),which is necessary to accommodate the expansion and contraction of,and reducing longitudinal stress in,the rails.The main aim of this study is to present analysis of recent developments in the research and application of BEJs in high-speed railway(HSR)long-span bridges in China,and to propose a performance-based integral design method for BEJs used with REJs,from both theoretical and engineering perspectives.Design/methodology/approach–The study first presents a summary on the application and maintenance of BEJs in HSR long-span bridges in China representing an overview of their state of development.Results of a survey of typical BEJ faults were analyzed,and field testing was conducted on a railway cable-stayed bridge in order to obtain information on the major mechanical characteristics of its BEJ under train load.Based on the above,a performance-based integral design method for BEJs with maximum expansion range 1600 mm(±800 mm),was proposed,covering all stages from overall conceptual design to consideration of detailed structural design issues.The performance of the novel BEJ design thus derived was then verified via theoretical analysis under different scenarios,full-scale model testing,and field testing and commissioning.Findings–Two major types of BEJs,deck-type and through-type,are used in HSR long-span bridges in China.Typical BEJ faults were found to mainly include skewness of steel sleepers at the bridge gap,abnormally large longitudinal frictional resistance,and flexural deformation of the scissor mechanisms.These faults influence BEJ functioning,and thus adversely affect track quality and train running performance at the beam end.Due to their simple and integral structure,deck-type BEJs with expansion range 1200 mm(±600 mm)or less have been favored as a solution offering improved operational conditions,and have emerged as a standard design.However,when the expansion range exceeds the above-mentioned value,special design work becomes necessary.Therefore,based on engineering practice,a performance-based integral design method for BEJs used with REJs was proposed,taking into account four major categories of performance requirements,i.e.,mechanical characteristics,train running quality,durability and insulation performance.Overall BEJ design must mainly consider component strength and the overall stiffness of BEJ;the latter factor in particular has a decisive influence on train running performance at the beam end.Detailed BEJ structural design must stress minimization of the frictional resistance of its sliding surface.The static and dynamic performance of the newlydesigned BEJ with expansion range 1600 mm have been confirmed to be satisfactory,via numerical simulation,full-scale model testing,and field testing and commissioning.Originality/value–This research provides a broad overview of the status of BEJs with large expansion range in HSR long-span bridges in China,along with novel insights into their design. 展开更多
关键词 High-speed railway(HSR) Long-span bridge Bridge expansion joint(BEJ) Integral design Rail expansion joint(REJ) Overall stiffness Longitudinal frictional resistance
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Discussion on Modern Architectural Design Method and Its Development Trend 认领 引用
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作者 LIJiubo HEQinzhou 《外文科技期刊数据库（文摘版）工程技术》 2022年第3期126-129,共4页
With the continuous development of society and the continuous progress of human civilization, the development of the construction industry also presents a changing trend, which is constantly developing and innovating ... With the continuous development of society and the continuous progress of human civilization, the development of the construction industry also presents a changing trend, which is constantly developing and innovating in terms of form and content. Therefore, in order to meet people's growing demand for architectural functions, it is necessary to continuously innovate and reform architectural design methods, improve the overall functionality and artistry of buildings, meet people's use and aesthetic needs, and promote the healthy and stable development of the construction industry. 展开更多
关键词 architectural design method trend
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Discussion on the Application of Lean Production Technology in "EPC" Project Management 认领 引用
10
作者 JIANGYun 《外文科技期刊数据库（文摘版）工程技术》 2022年第5期114-118,共5页
The appearance of lean production technology has greatly changed the tradition of manual production mode and mass production mode. It starts from product planning, extends to customers through the whole manufacturing ... The appearance of lean production technology has greatly changed the tradition of manual production mode and mass production mode. It starts from product planning, extends to customers through the whole manufacturing process and coordination of supplier systems, and becomes the most standard global production system in the 20th century-lean production mode. With the overall promotion of EPC general contracting mode in our country, the lean construction extending from lean production mode to construction industry will surely usher in great application and development space. It will completely change the traditional engineering implementation technology and mode, and thus create a new engineering project management mode with the goal of "win-win, integrated delivery". 展开更多
关键词 lean production technology EPC project management
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