Weld Joint Efficiency of the Kazakhstani Constructional Steel

In the Republic of Kazakhstan, the regulatory framework in construction based on Eurocodes has been in force since 2015. However, Kazakhstani produced steel has not been studied for compliance with the requirements of Eurocode 1993. This has resulted in limited use of Kazakhstani structural steel in construction. The feasibility of using structural steel in welded joints has been experimentally investigated. To verify the application of such joints in construction, including earthquake engineering, experimental studies of welded joints made of structural steel produced by Arcelor-Mittal in Temirtau have been carried out. In total, 7 types of structural steel of various thicknesses were selected. Five specimens have been used in each series of tests. The Brinell hardness values of the weld joint, yield strength of steel and tensile strength, relative rupture strain were determined. It was found that for all types of structural steel, the quality of weld joints complied with the requirements of Eurocode 1993—a sample rupture appeared along the plates (main body of the metal), not along the weld joints. It has been established that structural steel produced in the Republic of Kazakhstan fully complies with the requirements of Eurocode 1993. The studies on the dependence of Brinell hardness values of weld joint steel on the yield strength, tensile strength and relative rupture strain have been carried out. The correlation dependences between the values of yield strength of steel and tensile strength, relative rupture strain and BH Brinell hardness were studied. The results of work will allow for significantly increasing the use of Kazakhstani structural steel in seismic and conventional areas of the Republic of Kazakhstan.

Geometrical characteristic investigation of the Baihetan irregular columnar jointed basalt and corresponding numerical reconstruction method

Columnar jointed rock mass with unique geometric and geological properties is one spectacular example of geometrical order in nature.Columnar joints are generally accepted to be formed by spatially uniform volume contraction during cooling.In this paper,substantial field work was performed to study the geological characteristics of irregular columnar jointed basalt on the left bank dam foundation in the Baihetan Hydropower Station,where the columnar jointed rock mass is extensively exposed due to excavation.The quantitative measurements of the sizing of polygonal crack pattern of columnar joints and assessment of their degree of irregularity were summarized.Considering the irregularity of polygonal crack pattern,a modified Voronoi polygon(MVP)method was developed to model the special polygonal crack pattern of columnar joints.The new polygonal pattern obtained by the MVP method consists of a large number of irregular polygons,of which the degree of irregularity is consistent with the field measurement results.This method can reproduce the rapid evolution from an initial ideal regular hexagonal pattern to a final actual irregular polygonal pattern as the degree of irregularity increases.The compression tests of columnar jointed rock mass with different irregularity show that the geometric irregularity has a great influence on its mechanical properties.This numerical construction method provides a reliable way to reconstruct columnar joint structure with specific polygonal crack pattern,which is consistent with onsite columnar jointed basalt.

New Adhesive Material for Construction Joint of Tunnel Lining

The new adhesive material for the construction joints of tunnel lining(named as SZC) was studied based on the structural characteristics of interfaces and the characteristic of bonding construction, and the performance indexes were verified by tests. The experimental results show that the adhesive capability of interface is improved effectively by using SZC material, the properties, such as anti-freezing, erosion-resistance and anti-shrinkage are improved greatly as well as durability.

Cyclic Shear Tests on Key Connection Joints of Modularized Constructions

Modularized construction is a new type of prefabricated building system with green environmental protection and excellent performance. There are few studies on the seismic performance of its key connection joint. This paper presents a new type of assembled connection joint for the high-rise modularized construction. Cyclic shear tests of full-scale joints were carried out, and the key indexes of their seismic performances including the hysteretic performance, ductility, and energy dissipation capacity were analyzed and obtained. The results show that the hysteresis loops of longitudinal and lateral cyclic shear tests were both plump in shapes. The ductility coefficients were 4.54 and 4.98, and the energy dissipation coefficients were 1.83 and 1.43, respectively. The test joint had good ductility and energy dissipation capacity. The positions of yield failure of specimens were mainly concentrated in the connection areas between the column and short beam or end-plate. The research can provide the technical reference for the seismic design and engineering application of related modularized constructions.

All-out Startup of Construction of Sino-Kuwait Integrated Refining/Petrochemical Joint Venture Project

On December 20,2016 the construction of the SinoKuwait Guangdong integrated refining/chemical join venture project,which is the largest Sinopec’s projec under construction and also the key construction project of Guangdong province,had been kicked off comprehensively.This project is located in the new district of the East Sea Island inside the Zhanjiang Economic Development

深化职业教育产教融合的关键是实现跨界组织实体化运作

深化产教融合是职业教育实现高质量发展的核心举措。改革开放以来,我国职业教育产教融合在政策牵引和实践演绎的相互作用下,展现了由松散到紧密、由浅层次到深层次的演变历程。但长期以来,产教“融而不合”、校企“跨而不实”的现实困境始终难以破题。伴随市域产教联合体、行业产教融合共同体等新型产教跨界组织的产生与发展,以制度突破为基本前提,推进跨界组织的实体化运作成为深化职业教育产教融合的关键。而实现这一点,需要跨界组织具有符合实际的组织结构、发挥实效的主导权力、约束有力的职责分工、稳定的利益共享机制、有效的激励保障政策,也需要多方主体协同有效的共建共治。

以“支部联建”为载体创建附属医院职能部门服务型党支部实证研究

党建与业务工作相融合,是推动新时代公立医院高质量发展坚强的政治保障。文章聚焦医院高质量发展目标导向和问题导向,以创建“职能部门服务型”党支部为目标,通过“支部共建”活动载体探索活动联办、业务联动、队伍联育,将职能部门党支部的组织生活与临床业务工作有机结合,增强职能部门主动作为、靠前服务的意识,不断探索建立与临床医技科室党支部“联建共建”的路径和方法,发挥党员的先锋模范作用和党支部的战斗堡垒作用。

创建行动导向下美丽乡村联创联建的规划设计方法探索

伴随着浙江省乡村发展愿景从“千万工程”到“美丽乡村”再到共同富裕的纵深推进,以单个行政村为单元的美丽乡村创建模式已经难以适应新的发展诉求。基于自然资源禀赋或基础设施地理空间连续性的美丽乡村联创联建工作,是破解各行政村独立发展的多重瓶颈的创新性尝试。针对具有明确的目标、资金、时间约束的美丽乡村创建行动,基于“产业-空间协同发展”的总体思路,试图探讨一种面向美丽乡村联创联建的规划设计方法,即“二阶三心法”。这一方法从乡村地区的存量资源切入,旨在系统性、创造性地回应创建行动目标,开展面向产业-空间复合型目标的空间规划干预:一是基于“土地矛盾最小化原则”进行空间节点设计,二是基于“空间投入-融合效益最大化原则”形成特色主线,三是基于“优先塑造-示范带动原则”打造示范样板。进一步的,结合湖州市道场乡菰城片区规划设计工作,探讨了该方法在产业策划和空间设计层面落地应用的关键问题和解决策略,为中国先发地区美丽乡村联创联建的规划设计工作提供经验借鉴。

马鞍山长江公铁大桥Z3号桥塔施工关键技术

巢马城际铁路马鞍山长江公铁大桥主航道桥为(112+392+2×1120+392+112)m三塔钢桁梁斜拉桥,Z3号桥塔为超高多肢钢-混组合塔,高308 m。上塔柱钢结构高87.5 m,分13个吊装节段,最重505 t;中、下塔柱混凝土结构高217.5 m,分38个节段液压爬模施工;钢-混结合段高3 m,内部采用PBL键+剪力钉+高强度钢锚杆+高强度混凝土结构形式。在中塔柱设置钢管临时横撑控制塔柱线形及应力;下横梁采用落地支架法分层施工,与对应塔柱同步浇筑;钢-混结合段混凝土采用C60细石补偿收缩混凝土+高强度灌浆料,保证了混凝土施工质量;采用工厂“2+1”立体匹配制造、“提升站+运输栈桥”钢塔节段转运等技术,并研制15000 t•m超大型塔吊,实现了钢塔柱大节段的制造、整体滩地运输和吊装;钢塔节段间采用栓焊组合连接形式,通过设置工艺隔板、双面坡口等措施控制了钢塔焊接变形;利用定位桁架临时锁定钢塔合龙段实现了钢塔的精确合龙,定位桁架受力及变形均满足要求。

基于高校党建引领的产学研协同育人创新模式

根据产学研协同育人目标任务,从高校党建引领的角度,探索实践校政企“智联建”的产学研协同育人创新模式。本文深刻把握校政企“智联建”的研究背景,从高校学科发展任务需求出发,发挥高校党建引领作用,结合燕山大学机械工程学院校政企“智联建”的具体实践,提供高校党建工作与产学研协同育人的融合模式与方法,并对未来工作提出思考。

深港共建区域知识产权贸易中心的挑战和应对策略

为了发挥香港地区在粤港澳大湾区高质量发展中的知识产权贸易中心地位,中共中央、国务院印发《粤港澳大湾区发展规划纲要》,特别提出支持香港地区成为区域知识产权贸易中心。目前,香港地区建设区域知识产权贸易中心面临着建设目标和路径不明晰、有效支撑不足、统计体系不完善、政策不明确等挑战,亟需将深港共建区域知识产权贸易中心明确为国家级战略,完善知识产权贸易统计体系,出台支持政策,营造良好生态,合力提升国际影响力。

地下连续墙新型刚性接头设计与研究

城市建设的快速发展促使对地下空间的需求日益增加,地下连续墙作为深大基坑的支护或结构外墙的应用也越来越多。针对“两墙合一”的地下连续墙,提出了一种新型刚性接头、防绕流接头板及施工工艺,能有效预防混凝土绕流问题,进而提高地下连续墙的整体刚度、强度以及接头的止水能力。通过数值模拟计算了刚性接头的承载力与延性,并与普通工字钢接头进行了对比。结果表明,采用新型刚性接头的地下连续墙,具有较好的刚度和受力性能,施工可行性高,具有较好的应用和推广前景。总结的经验可供今后类似工程借鉴。

煤化工装置法兰接头密封泄漏评估管理系统研发

煤化工装置中螺栓法兰接头的泄漏问题一直是安全和环保管理的关键挑战。为解决此问题,文中设计并开发了涵盖了数据收集管理、密封泄露检测及修复、LEC泄漏风险评估及统计分析等功能的评估管理系统。通过该系统,可以实时监测密封泄漏、进行数据分析评估,并采用LEC评价法进行风险评估。系统业务模块面向不同管理层级的需求,有助于提高煤化工装置法兰接头密封泄漏评估管理的科学性和效率。系统致力于提高装置的密封性能、降低泄漏风险、合理配置检维修资源,从而实现装置的长周期运行。

碾压混凝土分层碾压离散元模拟及施工成层细观机理研究

碾压混凝土(RCC)坝特有的大仓面分层碾压工艺带来的层间结合质量问题,是影响其安全运行的重要因素。从施工控制的角度分析RCC施工成层机理,进而合理调整碾压参数,可有效保证大坝的施工质量。首先,通过RCC分层碾压试验,分析了碾压过程中含层面RCC的沉降规律、压实度及抗剪强度,为后续离散元模拟提供了基础;然后,建立并验证了RCC双层碾压与抗剪试验离散元模型;最后,给出了表征层间结合质量的骨料嵌入值指标,进而从孔隙率、层间骨料嵌入、层面应力分布、层间抗剪强度等方面分析了RCC施工成层的细观机理。结果表明:碾压参数对RCC的嵌入值、压实特性、层面应力和层间结合质量均有一定影响;嵌入值是影响层间抗剪强度的重要因素,二者呈线性相关,嵌入值每增加1 mm,模拟抗剪强度约增加1.583 MPa;激振力的增加以及行进速度、碾压厚度的减小均有利于提高层间结合质量,且碾压厚度是影响层间结合质量的最敏感参数。研究结果可为施工中RCC层间结合质量控制标准的制定提供理论依据。

专业核心课程群课程思政联合建设模式研究——以飞行器设计与工程专业为例

针对飞行器设计与工程专业的6门专业核心课——飞行器系统概论、空气动力学、飞行力学、结构力学、飞行器制导与控制和飞行器系统总体设计,开展6门课的课程思政联合建设模式研究。根据各门专业课的专业知识特点,建设“有中心、有主线、深融合”的体系化多层级联合课程思政资源库;分析6门课的开设时间及相应的学生学情,建设“有重点、分阶段、合规律”的课程思政联合形成性考核评价机制;针对每一门课,建设师生共建课程思政资源库、师生共同研究探讨课程思政主题、师生共同进步的知行合一课程思政教学方法。该联合课程思政建设方法可推广至专业所有课程的课程思政体系化建设中。

新型湿接缝钢筋连接构造的力学性能研究

为了弥补叠合梁桥面板湿接缝普通钢筋连接构造搭接长度大、绑扎或焊接难度高等缺陷,提出了L形钢筋连接构造。采用有限元软件ANSYS,对采用直钢筋、环形钢筋、弧形钢筋和L形钢筋连接构造的叠合梁桥面板湿接缝受力性能开展了数值模拟,对比研究了不同钢筋连接构造条件下湿接缝的受力特征、承载能力和施工工艺。研究结果表明:在湿接缝截面尺寸相同、配筋率相同的条件下,4种钢筋连接构造对应的湿接缝开裂前,非搭接区的混凝土及钢筋应力均高于搭接区,开裂时湿接缝混凝土的开裂位置均位于非搭接区,且开裂荷载与钢筋混凝土轴心受拉构件的开裂荷载理论值较为接近;L形钢筋连接构造的开裂荷载与直钢筋、弧形钢筋连接构造基本一致,但比环形钢筋低4%;4类普通钢筋混凝土湿接缝达到受拉承载力极限状态时均对应于非搭接区纵向钢筋的受拉屈服,湿接缝的受拉极限承载力只与非搭接区普通钢筋的面积和强度的乘积有关,即湿接缝的受拉极限承载力等于非搭接区纵向钢筋屈服时承受的拉力。L形钢筋连接构造在洛溪大桥拓宽工程中的成功应用表明,该连接构造开裂荷载及承载力均与其他钢筋连接构造的湿接缝相当,且具有施工工艺简单,施工便利的优点,值得在类似工程中推广应用。

美欧印全球基建计划对一带一路的影响及应对

在“一带一路”建设深入推进和效应显现之际,美欧印等主要经济体连续发布全球性基础设施投资建设计划,标志着美西方对“一带一路”倡议的战略围堵进入新阶段,使共建“一带一路”面临更多外部风险及现实挑战。要深刻认识共建“一带一路”的独特战略价值,继续坚定不移推动共建“一带一路”高质量发展;分类施策,突破美欧印全球基建计划对我的“合围”;巩固共建“一带一路”建设十年形成的基本盘;多维度推动数字丝绸之路、绿色丝绸之路、健康丝绸之路建设;加快“一带一路”规则标准体系建设;全面加强“一带一路”话语体系建设,推进共建“一带一路”更加行稳致远。

一种基于Unity3D技术的电缆接头故障测寻仿真系统

基于Unity3D技术设计了一个电缆接头故障测寻仿真系统。该系统可模拟电缆接头的失效情况,帮助用户快速定位故障点,并提供可视化的故障信息展示。本文首先介绍了电缆接头故障的常见类型和原因;然后详细阐述系统的设计思路和实现方法,描述了技术架构;最后,对该系统的推广场景及优化思路做了说明。

多功能一趟管联作高效修井技术研究与应用

为缩短作业占时,提高修井效率,控减劳务费用,实现降本增效,提出“一趟管修井”优化设计方法,研发“不动管联作”系列技术,建立“多工序集成”作业提速新模式。通过优化整合一趟管联作管柱设计,创新研发多功能组合工具串,形成了射孔下泵联作、冲洗下泵联作、压裂下泵联作、丢手下泵联作、修井一趟管联作等五大类共十项联作技术。实现了只利用一趟管柱即可完成传统技术上需要起下三趟管柱作业工序的工作量,在达到同样作业目的前提下,还解决了带压起下管过程井口冒喷污染、井控风险高等技术问题。联作技术已在江汉油区累计推广152井次,累计减少起下换管74.4×10^(4) m,单井平均缩短作业占时26 h,降低修井费用￥3.5万元,提高修井效率约30%。

快递进村倡议下“邮快合作”主体博弈关系研究

快递进村具有成本高和效率低的困难,邮政与民营快递企业在共建配送中心、开展共同配送业务等方面进行合作,是解决这一问题的重要手段。因此围绕共建共配的邮快合作模式,分析了邮政快递企业和民营快递企业之间的合作和博弈关系,并构建了演化博弈模型,选取某区的实际数据作为算例,探讨不同因素对合作稳定性的影响以及政府政策在邮快合作中所起的作用效果。结果表明:邮政占据主导地位对推进快递进村具有一定优势,政府推进邮快合作的政策补贴应考虑多种补贴形式。