Discussion on Construction Technology and Welding Deformation of High-Rise Steel Frame Structure

Because of urbanization,land resources in China’s cities has become increasingly scarce.Therefore,modern buildings are becoming taller,making high-rise steel frame structures the new favorite of the construction industry.However,the construction of high-rise steel frame structures requires advanced technology.If the construction technology is effectively implemented and the welding techniques of the construction personnel align with the requirements for high-rise steel frame structures,it can help mitigate deformations in the steel structure,thus preserving the overall construction quality of high-rise steel frame structures.To enhance the applicability of steel frame structures in high-rise buildings,this paper focuses on analyzing the optimization path for the construction process of high-rise steel frame structures.It introduces a tailored approach to control welding-induced deformations in steel frame structures,aiming to make a valuable contribution to the advancement of China’s construction industry.

The Construction Technology of Freeform Surface Spatial Bending-Torsion Steel Structure

Taking the construction project of the National Cybersecurity Talents and Innovation Base as an example,this paper studies the construction technology of freeform surface spatial bending-torsion steel structure based on structural design model transformation,including the parametric modeling of deepening design model,computer-aided bending and torsion frame production,flexible docking in the bending-torsion combination unit,and welding stress deformation,in hope to provide reference for similar projects in the future.

Analysis of Soundproof Technology of Assembled Steel Structure Houses

The problem of noise has always been highlighted in assembled steel structure houses.Therefore,it is necessary to use effective soundproof measures where steel beams intersect with the reserved line pipe openings,doors,windows,elevator shafts,and other locations.In this paper,we will investigate the areas with subpar soundproof performance in an assembled steel structure residential project and propose suitable noise control measures to address this issue.

Comparative study of microbial community structure in different filter media of constructed wetland

Comparisons of microbial community structure, in eight filter media of zeolites, anthracite, shale, vermiculite, ceramic filter media, gravel, steel slag and bio-ceramic, were undertaken by analyzing the phospholipid fatty acid （PLFA） composition. A total of 20 fatty acids in the range of C18to C20 were determined but only 13 PLFAs were detected in steel slag. They consist of saturated fatty acids, branched fatty acids, monounsaturated fatty acids, and polyunsaturated fatty acids. The variation of fatty acids was revealed in the relative proportions of these fatty acids in different media. The aerobic prokaryotes were the predominant group in all media. The PLFA composition showed significant differences among the eight different media by Tukey＇s honestly test. It was found that steel slag was significantly different in the microbial community as compared to other filter media, probably due to its alkaline effluent. Steel slag alone is probably not a good choice of substratum in constructed wetlands. The principle components analysis （PCA） showed that zeolites, bio-ceramic, shale and vermiculite had a similar microbial community structure while steel slag and ceramic filter media were distinct from other media.

Numerical Analysis of the Structure of High-Strength Double-Layer Steel Plate Concrete Shaft by Drilling Method of Water-Bearing Weak Rock Formation

In order to ensure the safety of coal mine shaft construction, a double-layer steel plate concrete composite shaft wall structure was proposed. However, fewer studies were conducted on this structure, which made engineers too confused to fully recognize its feasibility of this structure. Hence, based on the previous experimental research on the Taohutu mine construction project in Ordos in Inner Mongolia, this research paper aims to provide a widely deep numerical analysis by the usage of the finite element software, in fact, to establish the corresponding numerical analysis model and make a comparison with the experimental data to get the rationality of the verified model. The influence of the composite characteristics of the steel plate and concrete on the ultimate bearing capacity and stress field of the shaft wall structure is studied here through the method of multi-factor analysis. Also, the optimal design scheme of the double-layer steel plate and concrete composite shaft wall structure is proposed in this research paper.

Information Construction Technology of Free-Form Surface Steel Grid

Taking the construction project of National Network Security Talents and Innovation Base Exhibition Center as an example,the application of building information model in the construction process of free-form surface steel structure is analyzed in this paper.The results show that the application of Building Information Modeling(BIM)technology to the construction of free-form surface structure improves the work efficiency of the construction team in multi-disciplinary collaboration,surface component manufacturing,and construction process design,and subsequently improves the construction speed and construction quality.

Construction Technology for New Arched All-Steel Earth-inserted Tunnel

According to the influence of climatic conditions on vegetable production in the Yangtze River Basin,the existing arched tunnel was improved through investigation to provide guidance for the construction of arched steel tunnels in this area.

A Virtual Erection Simulation System for a Steel Structure Based on 3-D Measurement Data

虚拟勃起模拟系统为包括轮船和海洋植物块的钢结构被解释。模拟系统预言了勃起状态基于 3-D 测量数据优化块的任何差距或重叠。块被修改(切割) 在由鹤树立他们前在地面上根据模拟结果。re-cutting 过程没被要求，块快速地被树立进一艘母舰。因此，勃起时间被减少，增加船坞周转。

Tekla Structures软件在油气田地面工程加工设计中的应用

为提高油气田地面工程建设质量和效率,工程详细设计完成后进行加工设计十分必要。文章结合中石化胜利油建工程有限公司在伊朗和加纳的油气田地面工程项目,详细介绍了应用Tekla Structures软件进行钢结构加工设计的优越性和具体做法。该软件能快捷、准确地创建结构3D模型,且自动生成所需的图纸和各种精确报表,便于发现加工设计中的问题从而进一步优化设计,对节约工程成本和缩短工期具有重要意义。

Design and Construction Strategy of Arched Continuous Rigid-frame Bridge

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.

超高层建筑钢结构施工的关键技术和措施

随着城市化的不断推进,超高层建筑的兴建成为城市发展的一种趋势。在超高层建筑中,钢结构因其轻质、高强度等特点,成为超高层建筑的首选方案。文中通过对钢结构特征的分析,深入剖析了超高层建筑中的钢结构施工流程及影响因素。在此基础上,详细讨论了柱基础检查、钢柱吊装和钢柱连接等关键技术与应用措施,包括了施工过程中的质量监控、安全管理和技术检测等方面,旨在为超高层建筑钢结构施工提供可行的解决方案。

大跨斜撑钢结构预应力基础施工全过程受力分析

大跨斜撑钢结构被广泛应用于大型遗址保护工程,基于此,对钢结构基础预应力施工全过程进行研究,发现在结构自重和施工荷载的作用下,柱脚会产生较大的水平推力。由于桩基础的水平承载能力有限,在桩帽之间安装预应力基础梁,以平衡上部结构的水平荷载分量。通过数值模拟对工程实例进行施工分析,以确保关键构件的应力和桩顶位移在极限范围内。

基于改进HFACS模型的钢结构施工安全事故人因分析

为探究导致钢结构工程施工安全事故发生的主要人为原因,以收集整理我国2019年以来的105份钢结构施工安全事故调查报告为样本,构建改进的适用于钢结构施工安全事故的HFACS模型。对改进的HFACS模型中的致因因素进行频率分析,使用SPSS软件对各致因因素进行相关性分析。并利用网络层次分析法(ANP)确定各致因因素的权重。结果表明:“管理缺陷、监管不足、工人状况不佳、工人违规操作”是各层级中导致事故发生的高频因素,“管理缺陷-违规监督-工人状况不佳-工人技能失误”是导致事故发生的主要致因路径,组织影响层是导致事故发生的关键层级。针对高频因素、关键致因路径及关键致因层级分别提出预控建议。

深水FPSO吸力锚建造工艺

以某深水浮式生产储卸油装置(FPSO)的吸力锚建造为例,对吸力锚的钢制筒体、顶盖结构、内部切泥板、铸造吊耳及锚链等主要结构预制安装流程与吸力锚整体装船工艺进行阐述。研究结果表明:深水FPSO吸力锚在建造过程中通过制定合理的施工顺序、严格控制组对尺寸公差和焊接参数等措施,对整个项目的质量管控和工效提升至关重要,也为后期同类大型管状结构物的建造提供了有益的参考。

基于应用型人才培养目标的钢结构课程教学改革与实践

钢结构系列课程是土木工程专业的核心专业基础课,在人才培养方面具有突出的作用。文章立足土木工程应用型人才培养目标,结合钢结构系列课程自身的特点,给出了多元化的课程教学改革措施。教学改革实践表明,多元化课程教学改革措施,有效解决了钢结构系列课程在传统教学过程中客观存在的问题,锻炼了学生的工程实践能力,提高了课程的教学质量,并取得了显著的教学成果。多元化课程教学改革方案可以为相关课程的教学改革提供借鉴。

新质生产力背景下装配式钢结构建筑标准化施工策略研究

随着新质生产力的快速发展,装配式钢结构建筑作为一种绿色、高效的建筑方式,正逐渐受到广泛关注。本文在分析了其优势与面临的挑战后,提出了新质生产力背景下装配式钢结构建筑的标准化施工策略,为相关领域的实践和研究提供参考。

基于改进DEMATEL-ISM的钢桁梁桥施工风险影响因素研究

为提高钢桁梁桥施工过程中的安全管理,对钢桁梁桥施工中的风险因素进行分析,提出了一种基于改进DEMATEL-ISM的评价方法,首先引入三角模糊数对DEMATEL法中的直接影响矩阵进行改进,从而去模糊化以减少专家评价的主观性,再通过DEMATEL法分析各影响因素的影响度、被影响度、中心度与原因度并加以排序,对得到的主要影响因素进行初步分析,利用ISM法对筛选出的影响因素进行层次划分,得到直接层影响因素、过渡层影响因素与本质影响因素,并针对分析得到的5个本质影响因素提出深入的预防预警措施,可为钢桁梁桥施工方向的安全管理提供针对性措施,为事故预防提供一定的参考依据。

Microstructures and Mechanical Properties of a New Multi-functional 460 MPa Grade Construction Structural Steel

This article reports a new generation of Q460 multi-functional construction structural steel,which has high strength(yield strength larger than 460 MPa),excellent toughness(higher than 110 J/cm^(2) at-60 ℃),lower yield ratio(lower than 0.8),good fire resistance(yield strength at 600 ℃ larger than two-thirds of its room-temperature yield strength)and better corrosion resistance.The eff ects of finish cooling temperature(FCT)on the microstructure and properties were studied by scanning electron microscopy(SEM),transmission electron microscopy(TEM),emission electron probe micro-analysis(EPMA),electron backscattering diff raction(EBSD),tensile tester,impact tester,periodic immersion cycle acceleration test and electrochemical experiment.The results show that the strength and toughness are simultaneously improved by decreasing the FCT due to more lath-like bainite with large number of dislocations,refined martensite/austenite(M/A)with higher carbon concentration and increased high angle boundaries.In addition,the fire resistance of the newly developed Q460 steel is obviously better than the conventional one,which is mainly due to non-recrystallized lath-like bainite with high dislocation density at elevated temperature.The corrosion resistance of the new Q460 steel is also improved due to the addition of Cu and Cr.

山区钢桁梁斜拉桥设计和工程应用研究

随着交通强国和乡村振兴等国家战略的实施,我国山区桥梁建设的数量和规模与日俱增。文章调研世界范围内2113座山区桥梁(含中国1521座),分析山区桥梁的建设难点和应用现状,阐明山区斜拉桥的关键设计技术,研究山区钢桁梁斜拉桥主梁、主塔及斜拉索的方案选型及构造设计,探讨适用于山区条件的新型斜拉桥施工方法。结果表明:我国是世界上山区桥梁建设最多的国家,贵州省又居我国首位(34.4%)。山区斜拉桥通常具有大跨径、高塔墩、小边主跨比和结构不对称等特点,运输施工易、装配程度高、抗风性能好、抗震性能优和景观造型美的结构设计成为山区桥梁的主流趋势。钢桁梁比钢箱梁斜拉桥更适应于山区的建设条件,公路钢桁梁斜拉桥一般采用两片主桁,N形桁式,主桁高度为6~9m,节间长度为6~12m,梁上标准索距为12~16m。主桁横向联系采用华伦式,桥面系常用板桁组合体系,斜拉索则主要采用钢绞线斜拉索。新开发的缆索吊机法和节段纵移悬拼法解决了山区斜拉桥主梁整节段起吊、运输和拼装的难题,可供类似桥梁借鉴和参考。

基于点云数据的大型复杂钢结构智能化施工方法

大型复杂钢结构施工过程中,常面临施工尺寸质量难以把控、构件提升变形监测困难和合拢段现场配切效率低等问题。三维激光扫描技术可全覆盖地、快速精准地获取复杂构部件在施工过程中的点云数据,这为解决上述问题提供了新方法。为此,该文以重庆两江新区寨子路钢拱桥为工程背景,开展基于点云数据的大型复杂钢拱桥智能化施工方法的全流程研究。基于标靶球检测算法、快速四点一致集算法、迭代最近邻算法等实现标靶球点云数据的自动检测及多站点云数据之间的自动配准;通过BIM点云化技术、kNN算法等完成目标点云数据的半自动化提取,实现拱肋尺寸的智能化检测;基于八叉树算法、区域增长算法等实现拱肋提升变形的智能检测;为缩短拱肋的合拢工期,基于BIM模型焊缝信息提取技术、主成分分析算法、Canny边界检测算法、霍夫变换算法等提出数字化预拼装算法,得到合拢段的配切量。工程应用表明,该文所提出的智能施工方法效率高、自动化程度好,研究成果可为大型复杂钢结构的施工质量和安装效率的提升提供理论和算法支撑。