竹纤维含量对混凝土强度影响的试验研究
作者：
杨凌;陈强;谢兴华;李先民;包燕敏
期刊：
四川建材 ,2022年(02):15-18 ISSN：1672-4011
作者机构：
[杨凌; 陈强; 谢兴华; 李先民; 包燕敏] 湖南城市学院土木工程学院
关键词：
竹纤维;混凝土;试验研究
摘要：
在普通混凝土中加入竹纤维筋而形成的一种复合竹纤维混凝土,竹纤维在混凝土中呈多向分布,可阻碍混凝土内部微裂缝的扩展和宏观裂缝的发生和发展,它能提高混凝土的抗裂性能和抗拉强度。为了揭示竹纤维含量和长度对混凝土力学性能的影响,提出了3种含量和3种规格竹纤维长度的竹纤维混凝土试件进行28 d抗压、抗折、抗拉强度试验。试验结果表明竹纤维混凝土抗压强度随着竹纤维掺合量增加而降低,在小于5%竹纤维掺合量时,竹纤维相同掺合量,竹纤维长度越长,抗压强度降低幅度越大;竹纤维混凝土抗折、抗拉强度随竹纤维掺合量的增加有着较大提高,在相同竹纤维掺合量下,竹纤维长度越长,提高幅度越大;说明竹纤维对混凝土的强度影响大,特别是对竹纤维抗拉强度充分发挥,抗拉和抗折强度均有较大提高,该研究成果对于竹纤维混凝土结构设计以及在纤维混凝土结构工程中的应用提供了试验和理论依据。
语种：
中文
展开
An Improved Model to Calculate Pullback Force of Trenchless Horizontal Directional Drilling Pipeline
作者：
Liang, Xiao-qiang;Hu, Da;Li, Yong-suo;Yang, Xian;Jiang, Lei;...
期刊：
Advances in Civil Engineering ,2022年2022 ISSN：1687-8086
通讯作者：
Hu, D
作者机构：
[Zhang, Yun-yi; Liang, Xiao-qiang; Li, Yong-suo; Hu, Da; Hu, D] Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preve, Yiyang 413000, Peoples R China.;[Zhang, Yun-yi; Liang, Xiao-qiang; Hu, Da; Hu, D] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;[Zhang, Yun-yi; Liang, Xiao-qiang; Hu, Da; Hu, D] Cent South Univ, Minist Educ, Key Lab Metallogen Predict Nonferrous Met & Geol, Changsha 410083, Peoples R China.;[Yang, Xian] Hunan Univ Sci & Technol, Sch Resource Environm & Safety Engn, Xiangtan 411201, Hunan, Peoples R China.;[Jiang, Lei] Changsha Metro Grp Co Ltd, Changsha 410007, Peoples R China.
通讯机构：
[Hu, D ] H;Hunan City Univ, Hunan Engn Res Ctr Struct Safety & Disaster Preve, Yiyang 413000, Peoples R China.;Hunan City Univ, Sch Civil Engn, Yiyang 413000, Peoples R China.;Cent South Univ, Minist Educ, Key Lab Metallogen Predict Nonferrous Met & Geol, Changsha 410083, Peoples R China.
摘要：
In the pullback operation of horizontal directional drilling pipeline crossing, the existing calculation and prediction models of pullback force are relatively simple. Each pullback force maze greatly simplifies the wellbore trajectory and fails to make a detailed analysis of the pipeline stress and external resistance when the pipeline is pulled back in each characteristic trajectory area. The factors considered are relatively simple. Therefore, it is necessary to improve the calculation method of pullback force. This paper aims to establish an improved model, enhancing the earth pressure calculation method of unloading arch and winch calculation method, and carries out an example calculation of the improved formula. Therefore, it is necessary to study the pullback process of horizontal directional drilling pipeline. Firstly, this paper analyzes the calculation method of pullback force in horizontal directional drilling; studies the calculation formula and principle of common pullback force through examples; obtains the advantages, disadvantages, and applicable scope of different formulas; and improves the calculation model of pullback force and step resistance. The numerical simulation of the step crossing process is carried out, and the variation law of local stress and strain of the pipeline and relevant conclusions are obtained. The results show that the estimates of the winch calculation method are close to the actual pullback load of the project. The earth pressure calculation method of the unloading arch and the winch calculation method are improved, and a more stable and reliable calculation formula is obtained, which provides more valuable calculation data for the actual project. In the process of pullback, the pipeline will encounter step resistance after passing through the soft and hard staggered stratum, which will suddenly increase the increment of pipeline pullback force and lead to engineering accidents. If the pullback load suddenly increases and then decreases, it may encounter similar pipeline collision accidents. At the same time, emergency measures can be taken to prevent the crossing accident and ensure the safe pullback of the pipeline. © 2022 Xiao-qiang Liang et al.
语种：
英文
展开
Research on Metallogenic System and Deposit Genesis: With Zhacun Goldmine in Weishan County of Yunnan as an Example
作者：
Ding, Xing-yu;Hu, Wen-jun;Chang, Yi
期刊：
Geofluids ,2022年2022 ISSN：1468-8115
通讯作者：
Chang, Y.;Hu, W.-J.
作者机构：
[Ding, Xing-yu] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Hunan, Peoples R China.;[Hu, Wen-jun] Geol Environm Monitoring Inst Yunnan Prov, Kunming 650216, Yunnan, Peoples R China.;[Chang, Yi] East China Univ Technol, Sch Civil & Architecture Engn, Nanchang 330013, Jiangxi, Peoples R China.
通讯机构：
[Wen-jun Hu] G;[Yi Chang; Xing-yu Ding] S;School of Civil & Architecture Engineering,East China University of Technology,Nanchang,China<&wdkj&>Geology Environmental Monitoring Institute in Yunnan Province,Kunming,650216 Yunnan,China<&wdkj&>School of Civil Engineering,Hunan City University,Yiyang,China
关键词：
Introduction;Materials and Methods;Results;Discussion;Conclusion;Abstract;Data Availability;Additional Points;Ethical Approval;Consent;Disclosure;Conflicts of Interests;Authors’ Contributions;Funding Statement;Acknowledgements;Acknowledgments;Supplementary Materials;Reference;Dataset Description;Dataset Files;Abstract;Introduction;Introduction and Materials;Introduction and Methods;Materials;Materials and Methods;Methods;Results;Discussion;Results and Discussion;Discussion and Conclusion;Results and Conclusion;Conclusion;Conclusions;Data Availability;Additional Points;Ethical Approval;Consent;Disclosure;Conflicts of Interest;Authors’ Contributions;Funding Statement;Acknowledgements;Supplementary Materials;References;Appendix;Abbreviations;Preliminaries;Introduction and Preliminaries;Notation;Proof of Theorem;Proofs;Analysis of Results;Examples;Numerical Example;Applications;Numerical Simulation;Model;Model Formulation;Systematic Palaeontology;Nomenclatural Acts;Taxonomic Implications;Experimental;Synthesis;Overview;Characterization;Background;Experimental;Theories;Calculations;Model Verification;Model Implementation;Geographic location;Study Area;Geological setting;Data Collection;Field Testing;Data and Sampling;Dataset;Literature Review;Related Works;Related Work;System Model;Methods and Data;Experimental Results;Results and Analysis;Evaluation;Implementation;Case Presentation;Case Report;Search Terms;Case Description;Case Series;Background;Limitations;Additional Points;Case;Case 1;Case 2 etc.;Concern Details;Retraction Details;Copyright;Related Articles
摘要：
This paper mainly takes Zhacun goldmine as the research object and carries out research on the metallogenic system and genesis of the deposit in the area. The research methods are as follows: according to the geological characteristics of the metallogenic mining area in the Zhacun goldmine, combined with the comparative analysis of the metallogenic age, alteration characteristics and lithology between the Zhacun goldmine and the Lianhuashan alkali rich rock mass, and the analysis of the isotopic data in the Zhacun goldmine, this paper demonstrates that the magmatic activity of the Lianhuashan quartz monzonite porphyry plays an important role in the mineralization of this area, which is both an important ore source and fluid source. It is also the main heat source driving the circulation of ore-forming fluid. On this basis, through the analysis of the metallogenic elements in the area, the metallogenic system model of Zhacun goldmine is constructed. It is considered that under the action of long-term horizontal compressive stress, the atmospheric precipitation infiltrated into the formation continued to penetrate along the fractures and fissures to deep crust and finally mixed with the magmatic water sealed in the thick formation. During this period, a series of shallow and ultrashallow porphyry mass intruded, providing heat source and part of the ore-forming materials and resulting in incomplete homogenization under high temperature and high pressure, which formed highly mineralized mixed water. Under the combined action of long-term compressive stress and various deep thermal dynamics, these mineral fluids migrated along the buried deep faults near the core of the duplex anticline to the upper part of the crust. When the metal elements in these ore fluids migrated over long distances to the nappe fault zone of the gold-bearing fracture zone, the gold began to precipitate, and the native gold and the coarse-grained pyrite and quartz formed at the same time or earlier started to fill the fracture zone along the fissures and accumulate into minerals. Then, through the analysis of metallogenic conditions, gold mineralization process, and genetic mechanism of the deposit, it is proposed that the genetic type of the ore deposit in this area is magmatic mesothermal-epithermal gold deposit. The establishment of metallogenic system model in Zhacun goldmine will provide theoretical and practical guidance for deep and peripheral prospecting prediction in the area, carry out targeted and reasonable prediction, and improve prospecting effectiveness. © 2022 Xing-yu Ding et al.
语种：
英文
展开
Effect of Rheological Mesoparameters on Shear Mechanical Behavior of Joints
作者：
Zhou, Kefeng;Liu, Sheng;Cheng, Yanhui
期刊：
Geofluids ,2022年2022 ISSN：1468-8115
通讯作者：
Zhou, K.
作者机构：
[Liu, Sheng; Zhou, Kefeng] Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, Changsha 410114, Hunan, Peoples R China.;[Cheng, Yanhui] Hunan City Univ, Sch Civil Engn, Yiyang 413000, Hunan, Peoples R China.;[Cheng, Yanhui] Cent South Univ, Sch Resource Safety Engn, Changsha 410083, Hunan, Peoples R China.
通讯机构：
[Zhou, K.] S;School of Traffic and Transportation Engineering, Changsha University of Science and Technology, Hunan, Changsha, China
摘要：
Under natural conditions, joint failure usually occurs after long-term loading rather than short-term loading. In order to prevent rock mass failure caused by creep behavior, bolt is widely used as a mature and effective reinforcement method. Therefore, it is necessary to consider the rheological effect of bolted joint. In this paper, the particle flow code (PFC) was used to study the effect of mesoparameters on the rheological shear mechanical behavior of joints without bolts and with bolts. The effects of mesoparameters such as Maxwell elastic coefficient Em, Maxwell viscosity coefficient Cm, Kelvin elastic coefficient Em, Kelvin viscosity coefficient Cm, and friction coefficient Fs were analyzed. The results show that Em and Fs mainly affect the instantaneous shear displacement, but have little effect on the rheological shear displacement. However, Cm, Ek, and Ck have little effect on the instantaneous shear displacement, and the sensitivity is mainly reflected in the rheological shear displacement. Em and Fs mainly affect the instantaneous shear displacement, but have little effect on the rheological shear displacement. However, Cm, Ek, and Ck have little effect on the instantaneous shear displacement, and the sensitivity is mainly reflected in the rheological shear displacement. Compared with the parameter sensitivity characteristics without bolt, the instantaneous shear displacement, shear stiffness, and steady rheological displacement under anchor condition are less affected by parameters, indicating that anchor can reduce the influence of joint parameters. © 2022 Kefeng Zhou et al.
语种：
英文
展开
大型建设工程项目团队内部个人知识学习策略研究
作者：
张谨帆;陈赟;张营慧
期刊：
铁道科学与工程学报 ,2022年19(1):282-290 ISSN：1672-7029
作者机构：
[张谨帆] 长沙理工大学 交通运输工程学院,湖南 长沙 410114;[张谨帆] 湖南城市学院 土木工程学院,湖南 益阳 413046;[张营慧; 陈赟] 长沙理工大学
关键词：
大型建设工程项目;内部学习;个人学习
摘要：
探讨大型建设工程项目团队内部个人知识学习策略对学习效果的影响,为团队内部学习机制设计和知识管理提供理论支撑及有效指导。基于复杂自适应系统的刺激-反应理论,从大型建设工程项目团队内部个人学习视角,把团队成员个人学习过程内嵌于工程项目团队任务的背景下,构建大型建设工程项目团队内部知识学习多主体仿真模型。通过仿真实验分析发现动态条件下,团队任务绩效、团队知识水平与团队各层级成员的个人学习策略相关,得到大型建设工程项目团队各层级成员个人学习的最优策略,使各层级成员之间形成良性互动,提高团队学习效率。研究结果表明:团队高层成员初期应减少与团队建设任务相关的内部学习,以营造团队宽容的学习氛围为主,随着项目建设任务逐渐完成,高层成员应及时采取均衡学习策略提高自身知识水平,同时示范带动其他成员学习,促进知识在团队内的留存和传播;中层成员应较积极地向高层成员学习并在团队内分享知识;基层成员应从便捷、高效的角度出发,较积极地向其他经验丰富、知识范围广的基层成员和中层成员学习。
语种：
中文
展开
基于CNKI文献统计的中国再生水灌溉研究分析
作者：
孙梦莹;仇振杰
期刊：
湖南城市学院学报(自然科学版) ,2022年31(06):69-74 ISSN：1672-7304
作者机构：
[仇振杰] 湖南城市学院 土木工程学院,湖南 益阳 413000;[仇振杰] 城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南 益阳 413000;[孙梦莹] 湖南城市学院
关键词：
再生水;灌溉;土壤质量;环境健康;文献计量
摘要：
再生水灌溉是缓解农业水资源紧缺的重要举措.本研究以CNKI期刊数据库为数据来源,利用EXCEL和SPSS软件对1991―2021年公开发表的有关再生水灌溉的研究型期刊文献进行了数据梳理与统计,从文献主题、试验因素、研究区域尺度、灌溉年限等方面对近30 a的中国再生水灌溉研究进行了定性和定量分析.研究结果表明:再生水灌溉标准有待进一步优化与落实;基于再生水灌溉的安全和效率,应根据风险控制的原则确定灌溉参数和水肥管理制度;再生水在土壤-作物-地下水-空气系统的迁移转化需长期持续监测评估.
语种：
中文
展开
全轻页岩陶粒混凝土与钢筋粘结性能试验研究
作者：
周超;曹国辉;张再华;朱海航;何杰
期刊：
湖南城市学院学报(自然科学版) ,2022年31(06):9-13 ISSN：1672-7304
作者机构：
[周超] 长沙理工大学土木工程学院;[何杰; 朱海航; 曹国辉; 张再华] 湖南城市学院土木工程学院
关键词：
全轻页岩陶粒混凝土;拔出试件;极限粘结强度;钢筋直径
摘要：
本文对36个拔出试件进行了拉拔试验,研究了全轻页岩陶粒混凝土与钢筋的粘结性能,并提出了适用于计算全轻页岩陶粒混凝土与带肋钢筋极限粘结强度的改进表达式.研究结果表明:当锚固长度为5倍钢筋直径时,HRB400、HRB500钢筋与全轻页岩陶粒混凝土的极限粘结强度无明显区别;钢筋直径越大,极限粘结强度越低;利用改进后的全轻页岩陶粒混凝土与带肋钢筋极限粘结强度表达式计算所得理论值与实测值吻合较好.
语种：
中文
展开
非开挖HDD钻头导向强度影响因素及计算模型研究
作者：
梁小强;黎永索;胡达;张顺金
期刊：
湖南城市学院学报(自然科学版) ,2022年31(2):1-4 ISSN：1672-7304
作者机构：
[黎永索; 梁小强; 胡达] 湖南城市学院城市地下基础设施结构安全与防灾湖南省工程研究中心,湖南 益阳 413000;[梁小强; 胡达] 湖南城市学院土木工程学院,湖南 益阳 413000;[黎永索] 湖南城市学院市政与测绘工程学院,湖南 益阳 413000;[张顺金] 长沙市规划设计院有限责任公司岩土所,长沙 410007
关键词：
非开挖HDD;导向强度;导向孔设计;影响因素
摘要：
从非开挖HDD技术施工工艺出发,阐述了水平定向钻进中钻头进行导向的工作原理,分析了导向强度的影响因素,即岩土体强度、导向钻头斜掌的结构形状、钻杆刚度、冲洗液、给进力大小与速度.经计算模型得出:岩土体强度、导向钻头斜掌的结构形状与钻杆刚度是影响钻头导向强度的主要因素;设计与施工阶段应重视导向强度的作用,避免因导向孔设计不合理(造斜段与水平段衔接处导向强度过大)而发生钻杆断裂、拖管卡管或管道变形损伤等工程事故.
语种：
中文
展开
Optimised neural network prediction of interface bond strength for GFRP tendon reinforced cemented soil
作者：
Zhang, Genbao;Chen, Changfu;Zhang, Yuhao;Zhao, Hongchao;Wang, Yufei;...
期刊：
Geomechanics and Engineering ,2022年28(6):599-611 ISSN：2005-307X
通讯作者：
Wang, YF
作者机构：
[Zhang, Genbao] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Hunan, Peoples R China.;[Wang, Yufei; Wang, YF] Chongqing Univ, Inst Smart City, Chongqing Univ Liyang, Zhenjiang 213300, Jiangsu, Peoples R China.;[Zhang, Genbao] Hunan Engn Res Ctr Struct Safety & Disaster Preve, Yiyang 413000, Hunan, Peoples R China.;[Chen, Changfu] Hunan Univ, Minist Educ, Key Lab Bldg Safety & Energy Efficiency, Changsha 410082, Hunan, Peoples R China.;[Chen, Changfu] Hunan Univ, Coll Civil Engn, Changsha 410082, Hunan, Peoples R China.
通讯机构：
[Wang, YF ] C;Chongqing Univ, Inst Smart City, Chongqing Univ Liyang, Zhenjiang 213300, Jiangsu, Peoples R China.
关键词：
back propagation neural network;cemented soil;element pullout test;glass fibre reinforced polymer reinforcement;interface bond strength;machine learning;particle swarm optimisation
摘要：
Tendon reinforced cemented soil is applied extensively in foundation stabilisation and improvement, especially in areas with soft clay. To solve the deterioration problem led by steel corrosion, the glass fiber-reinforced polymer (GFRP) tendon is introduced to substitute the traditional steel tendon. The interface bond strength between the cemented soil matrix and GFRP tendon demonstrates the outstanding mechanical property of this composite. However, the lack of research between the influence factors and bond strength hinders the application. To evaluate these factors, back propagation neural network (BPNN) is applied to predict the relationship between them and bond strength. Since adjusting BPNN parameters is time-consuming and laborious, the particle swarm optimisation (PSO) algorithm is proposed. This study evaluated the influence of water content, cement content, curing time, and slip distance on the bond performance of GFRP tendon-reinforced cemented soils (GTRCS). The results showed that the ultimate and residual bond strengths were both in positive proportion to cement content and negative to water content. The sample cured for 28 days with 30% water content and 50% cement content had the largest ultimate strength (3879.40 kPa). The PSO-BPNN model was tuned with 3 neurons in the input layer, 10 in the hidden layer, and 1 in the output layer. It showed outstanding performance on a large database comprising 405 testing results. Its higher correlation coefficient (0.908) and lower root-mean-square error (239.11 kPa) were obtained compared to multiple linear regression (MLR) and logistic regression (LR). In addition, a sensitivity analysis was applied to acquire the ranking of the input variables. The results illustrated that the cement content performed the strongest influence on bond strength, followed by the water content and slip displacement. © 2022 Techno-Press, Ltd.
语种：
英文
展开
Investigation of relationship between accelerated ultraviolet radiation aging in laboratory and weathering aging for asphalt binder
作者：
Shihui Guo* ;Yin Zhang;Huang Tang
期刊：
International Journal of Pavement Research and Technology ,2021年14(4):466-472 ISSN：1996-6814
通讯作者：
Shihui Guo
作者机构：
[Shihui Guo] College of Civil Engineering, Nanyang Institute of Technology, Nanyang, China;[Yin Zhang] College of Civil Engineering, Henan University of Engineering, Zhengzhou, China;[Huang Tang] College of Civil Engineering, Hunan City University, Yiyang, China
通讯机构：
[Shihui Guo] C;College of Civil Engineering, Nanyang Institute of Technology, Nanyang, China
关键词：
Asphalt binder;Weathering aging;Ultraviolet radiation aging;Rheological properties;Hardening susceptibility;Equivalent relationship
摘要：
The weathering aging pattern is a time-consuming aging method although it is accessible to asphalt actual field aging conditions. The accelerated ultraviolet (UV) radiation aging in laboratory shows the same aging factors (such as heat, oxygen and UV radiation) as weathering aging, which can make the accelerated UV radiation aging in laboratory become a potential alternative to weathering aging. Therefore, it is necessary to build the equivalent relationship between these two aging patterns and then to shorten the required weathering aging durations by accelerated UV radiation aging simulation. Two types of base asphalt binder were selected as research objects and the evolution of their rheological properties including complex modulus (G*), phase angle (δ) and zero shear viscosity (ZSV) with indoor accelerated UV radiation aging durations was investigated. Then, based on logarithmic zero shear viscosity (log (ZSV)) values, the relationship between accelerated UV radiation aging and weathering aging of asphalt binder was built by utilization of two-reaction kinetic aging model and extrapolation of accelerated aging result to weathering aging result. Furthermore, the equivalent relationship between the two aging patterns was further validated in terms of molecular weight distribution and carbonyl index results. The results indicate that with the increase in accelerated UV aging time, values of complex modulus and zero shear viscosity gradually increase whereas values of phase angle decrease for both two base asphalt binders. The changing trend of log (ZSV) value with UV aging time fits well with two-reaction kinetic aging model. The 18-month weathering aging is demonstrated to be almost equivalent to 16−18-day accelerated UV aging by analyzing rheological, molecular weight distribution and carbonyl index results.
语种：
英文
展开
《路基路面工程》开展课程思政教学实践的难点与关键
作者：
毛宇;陈湘亮;刘灵勇;熊焱
期刊：
建筑工程技术与设计 ,2021年(11):2498
作者机构：
湖南城市学院 土木工程学院 湖南益阳 413000;[熊焱; 陈湘亮; 刘灵勇; 毛宇] 湖南城市学院
关键词：
路基路面工程;课程思政;教学改革
摘要：
高校是意识形态建设的前沿阵地，课堂教学是高校思想政治工作的主渠道。《路基路面工程》是高等学校土木与交通类专业的重要必修课程，密切结合新形势下大环境、教师主体和教学对象的新情况，在课程教学活动中开展课程思政，可以将专业知识与思想政治学习融为一体，实现协同育人效果。
语种：
中文
展开
基于云班课的《路基路面工程》教学实践
作者：
毛宇;陈湘亮;刘灵勇;熊焱
期刊：
建筑工程技术与设计 ,2021年(10):2358
作者机构：
湖南城市学院 土木工程学院 湖南 益阳 413000;[熊焱; 陈湘亮; 刘灵勇; 毛宇] 湖南城市学院
关键词：
路基路面工程;云班课;教学改革
摘要：
基于云班课 App 进行线上线下结合教学实践，在计划学时内使学生全面掌握该课程的基本知识和方法 , 达到应用型本科人才培养目标的要求 , 是一种教学模式创新的探索。
语种：
中文
展开
房屋建筑施工中防渗漏施工技术分析
作者：
傅勉
期刊：
产城 ,2021年(02):0180-0180 ISSN：2095-8161
作者机构：
湖南城市学院土木学院,湖南益阳413000
关键词：
房屋建筑;防渗漏;施工技术;策略分析
摘要：
随着时代的不断发展,我国社会经济水平在不断提高,人民的 生活质量也得到极大改善。如今人们对于房屋建筑的质量有着越来 越高的要求,传统的工程建设模式与理念已经无法满足当前社会发 展的实际需求。新时代,施工单位应将更多的时间和精力放在防渗漏 施工环节,积极采用先进的防渗漏施工技术,结合实际施工情况有 针对性的开展工作,以此来不断提高房屋建筑施工的质量。本文在 具体的研究过程中从多方面入手,首先分析了造成房屋建筑施工中各 个环节出现渗漏问题的主要原因,其次阐述了较为常见的防渗漏施工 技术,最后则是提出了切实可行的解决策略。
语种：
中文
展开
熵权法在铀矿井下空气环境安全评价中的应用研究
作者：
王淑云;黄芳;谭雄;黄爽;匡雅;...
期刊：
安全与环境学报 ,2021年21(02):538-545 ISSN：1009-6094
作者机构：
[王淑云; 廖宇航; 黄爽; 黄芳] 南华大学资源环境与安全工程学院;[谭雄] 中国铀业有限公司;[匡雅] 湖南城市学院土木工程学院
关键词：
安全卫生工程技术;铀矿井下;空气环境;熵权法;模糊综合评价法
摘要：
为科学合理地评价铀矿井下空气环境质量,通过对广东某铀矿及辽宁某铀矿井下空气环境的调查,分析了铀矿井下空气环境的特点及其危害,确定氡、氡子体、铀矿尘、CO、NO2及矿井气候6个指标为影响铀矿井下空气环境质量的主要因素,依此建立铀矿井下空气环境安全评价指标体系。采用模糊综合评价法建立了铀矿井下空气环境安全评价模型,并采用熵权法客观赋权的方式确定各评价指标权重,避免了评价过程中人为主观因素的影响,从而得到比较客观的评价结果。以南方某铀矿井为例,运用建立的评价模型对其井下采场、巷道掘进、天井掘进3个工作面空气环境质量进行安全评价。结果表明,采场工作面空气环境质量为良好,巷道掘进工作面和天井掘进工作面空气环境质量为中等。其评价结论可为企业优化井下工作场所空气环境质量提供参考。
语种：
中文
展开
不锈钢芯板一字形剪力墙抗震性能试验研究
作者：
舒兴平;熊志奇;张再华
期刊：
建筑结构 ,2021年51(18):1-8 ISSN：1002-848X
作者机构：
[舒兴平; 熊志奇] 湖南大学土木工程学院钢结构研究所;[张再华] 湖南城市学院土木工程学院
关键词：
不锈钢芯板一字形剪力墙;抗震性能;延性;耗能能力;试验研究
摘要：
为研究不锈钢芯板一字形剪力墙的抗震性能,完成了在不同轴压比、不同面板厚度以及不同芯管排布下,四个不锈钢芯板一字形剪力墙构件的拟静力试验,研究了构件在低周往复荷载作用下的变形特征和破坏模式,分析了构件在水平荷载作用下滞回曲线、骨架曲线、荷载特征值、延性系数、刚度退化、承载力退化以及耗能能力等抗震性能。试验结果表明:不锈钢芯板一字形剪力墙发生压弯破坏,且破坏形态均表现为构件根部位置的侧板与面板发生局部屈曲;面板厚度越大,承载力越高;当构件面板与侧板厚度相同时,可以保证面板与侧板能够协同工作,有较好的延性以及耗能能力;作为墙体两侧面板的连接件,芯管排布对构件抗震性能影响不大;增大轴压比会抑制面板的鼓曲,但会降低墙身的延性与耗能能力。
语种：
中文
展开
结构拓扑优化局部性能约束下轻量化问题的互逆规划解法
作者：
隋允康;彭细荣;叶红玲;李宗翰
期刊：
计算力学学报 ,2021年38(04):479-486 ISSN：1007-4708
作者机构：
[李宗翰; 叶红玲; 隋允康] 北京工业大学材料与制造学部;[彭细荣] 湖南城市学院土木工程学院
关键词：
局部性能约束;交融解法;互逆规划;分部解法;化整解法;集成解法;结构拓扑优化;ICM方法
摘要：
瞄准应力和疲劳两类局部性能约束的结构拓扑优化问题,概括为分部、化整和集成3种解法和交融的3种解法。类比应力约束推导了疲劳寿命情况,一为满疲劳公式,二为疲劳寿命约束全局化的结构寿命概念和相应解法。在倒寿命概念下,实现了疲劳寿命约束与应力约束的规格统一。补充和完整了已有的局部性能约束解法,属于单目标模型,有分部、化整、集成三种。基于互逆规划理论的定理2,提出了交融优化解法,是单目标与多目标模型的交替迭代,有分部-集成、化整-集成和集成-集成三种。上述6种解法皆基于ICM方法进行建模。算例表明,新提出的交融优化方法提高了求解效率。
语种：
中文
展开
大型风力机圆形扩展基础倾覆破坏机理分析
作者：
邓宗伟;邓沛宇;高乾丰;郑清源;黎永索
期刊：
太阳能学报 ,2021年42(03):15-20 ISSN：0254-0096
作者机构：
[邓宗伟; 郑清源; 黎永索] 湖南城市学院土木工程学院;[邓沛宇] 南华大学土木工程学院;[高乾丰] 湘潭大学土木工程学院
关键词：
风力机;数值模拟;应力;动力响应;随机风荷载
摘要：
为研究以坡积土为持力层的风电基础在风荷载作用下的倾覆破坏机理,以2 MW装机容量的圆形扩展基础为研究对象,基于ABAQUS有限元软件对该基础的室内1∶10缩尺模型的地基土应力和基础沉降进行计算研究。同时利用该基础的缩尺模型试验结果验证数值模型的可靠性。研究表明:随机风荷载引起的地基土应力的扩大效应和不均匀沉降的扩大效应,是导致风力机基础出现倾覆破坏的主要原因;当受强风荷载作用时,迎风侧基础边缘的土体首先进入塑性区,发生屈服破坏,导致上覆土体隆起,基础倾覆破坏就会随之发生。建议在进行风电基础设计计算时,对风力机基础中轴线上的相对沉降验算点处的沉降乘以合适的沉降扩大系数,以保证基础结构安全稳定。
语种：
中文
展开
Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load
作者：
Huang, Guoping* ;Hu, Jianhua;Liu, Haibo;Sun, Xiugui
期刊：
Advances in Civil Engineering ,2021年2021 ISSN：1687-8086
通讯作者：
Huang, Guoping
作者机构：
[Sun, Xiugui; Hu, Jianhua; Huang, Guoping] Hunan Univ, Key Lab Wind & Bridge Engn Hunan Prov, Coll Civil Engn, Changsha 410082, Peoples R China.;[Huang, Guoping] Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.;[Hu, Jianhua; Liu, Haibo] Hunan Commun & Water Conservancy Grp Ltd, Changsha 410008, Peoples R China.;[Sun, Xiugui] Hunan Prov Commun Planning Survey & Design Istute, Changsha 410200, Peoples R China.
通讯机构：
[Huang, Guoping] H;Hunan Univ, Key Lab Wind & Bridge Engn Hunan Prov, Coll Civil Engn, Changsha 410082, Peoples R China.;Hunan City Univ, Coll Civil Engn, Yiyang 413000, Peoples R China.
摘要：
Vehicle load may not only cause vertical deformation and vibration of suspension bridge but also lead to longitudinal deformation and vibration. And the longitudinal behavior is closely related to the durability of the girder end devices and the bending fatigue failure of suspenders. In this study, the longitudinal deformation behavior and longitudinal vibration of suspension bridge under vehicles, as well as the related influencing factors, are investigated. The underlying mechanism of girder longitudinal movement under the moving vehicles is revealed. Based on the simplified vehicle model of vertical concentrated force, the characteristics of main cable deformation and girder longitudinal displacement under vertical loads are analyzed first. Then, the longitudinal motion equation of the girder under vertical moving loads is derived. Finally, a single long-span suspension bridge is employed in the case study, and the girder longitudinal response and influencing factors are investigated based on both numerical simulation and field monitoring. Results indicate that the asymmetric vertical load leads to cable longitudinal deflection owing to the geometrically nonlinear characteristic of the main cable, leading to longitudinal movement of the girder. The results of field monitoring and numerical simulation indicate that the girder moves quasi-statically and reciprocates longitudinally with centimeter amplitude under normal operational loads. © 2021 Guoping Huang et al.
语种：
英文
展开
基于无人驾驶车辆的不同车道模式交通流优化
作者：
周昭明;黄中祥;袁剑波;李盼
期刊：
长安大学学报(自然科学版) ,2021年41(01):103-115 ISSN：1671-8879
作者机构：
长沙理工大学道路灾变防治及交通安全教育部工程研究中心;[李盼] 湖南城市学院土木工程学院;[黄中祥; 袁剑波] 长沙理工大学交通运输工程学院;[周昭明] 长沙理工大学道路灾变防治及交通安全教育部工程研究中心<&wdkj&>湖南城市学院土木工程学院<&wdkj&>长沙理工大学交通运输工程学院
关键词：
交通工程;混合交通流优化;连续平均法;无人驾驶车辆;市场渗透率;专用车道
摘要：
为研究不同类型车辆组成的混合交通流的运行模式,假定无人驾驶车辆、先进出行者出行系统（advanced traveler information systems,ATIS）装置车辆和普通驾驶车辆分别遵从系统最优模式、用户均衡模式、随机用户均衡模式选择路径,分别建立普通车道、专用车道模式下的交通分配模型,给出求解模型的连续平均算法（method of successive averages,MSA）。通过算例确定路段通行能力,分析信息质量水平、出行需求量、市场渗透率对出行时间的影响,在确定模型各项参数取值的基础上,根据专用车道设置情况对混合均衡流状态进行研究,验证模型算法的可行性和收敛性。研究结果表明:通行能力随着行驶速度的增加先提高后下降,选择合适的行驶速度将提高路段通行能力,且无人驾驶专用道的通行能力明显高于普通车道;适当提高信息质量水平,可降低路径选择的随机性,有效减少平均出行时间;随着出行需求量的增加,平均出行时间逐渐提高,其中系统最优模式（无人驾驶专用道）的平均出行时间最小;根据市场渗透率的变化情况选择合适的车道配置模式,既能提高道路资源的使用效率,又能减少出行者的出行成本;不同车道配置模式下的混合交通流均随着迭代次数的增加逐渐达到稳定状态;当无人驾驶车辆的市场渗透率较高时,设置无人驾驶专用道将缩短行驶时间,提高运行效率。
语种：
中文
展开
基于OBE教育理念的混合课程教学改革——以《安全学原理》为例
作者：
胡阿香;姚琦;胡达
期刊：
数据科学与信息计量学(英文) ,2021年8(50):45-47,66. ISSN：2694-6114
作者机构：
湖南城市学院 土木工程学院，湖南 益阳;[胡达; 胡阿香; 姚琦] 湖南城市学院
关键词：
OBE教育理念;混合课程;教学改革;安全学原理
摘要：
OBE理念以“以学生为中心”，注重对预期学习效果的把握，为当前我国应用型高校人才培养模式提出了一个新视角。以《安全学原理》课程为例，从案例引入、混合式教学、多元评价等方面进行了OBE教育理念的混合课程教学改革的探讨。最后分析了我校《安全学原理》作为新办安全工程专业的核心课程存在的问题，并提出了相应的解决策略。
语种：
中文
展开
