深圳冠泽金融中心超高层办公塔楼结构设计

深圳冠泽金融中心超高层办公塔楼采用带腰桁架的巨柱框架-核心筒结构体系,针对此稀柱网混合结构体系的结构设计、抗震性能要点进行了归纳总结;提出此类结构体系为了满足规范设计、抗震性能目标C,建议采取如下加强措施:增设带适宜刚度腰桁架的加强层以增强外框架刚度;加强层楼板采用钢梁+钢水平撑+钢筋桁架楼承板以可靠传递加强层外框架与核心筒间的剪力;设置约束型构造钢梁,与墙肢内型钢柱形成墙内约束型钢边框以提高底部、加强层核心筒的延性与整体性;多遇地震作用下,此体系核心筒需承担100%地震剪力。     

某地铁车站深基坑工程管线悬吊施工技术

某地铁车站工程管线悬吊施工中,根据工程特点制定了采用自制钢梁与军用梁悬吊管线两种技术方案。根据方案建立有限元模型进行数值计算,结果表明自制钢梁不能满足施工安全要求,施工中选择了军用梁悬吊管线。监测结果表明,采用军用梁悬吊污水管线科学合理,技术得当。     

太原南站大跨度放射伞状空间桁架分块安装技术

太原南站站房屋盖工程共由48个独立伞状钢结构单元体构成,每个钢结构单元体由1个钢柱、4榀主桁架和若干次桁架构成。采用大跨度放射伞状空间桁架的分块安装技术,将单元体拆分为若干个分块,各个分块在地面拼装完成,吊装时按钢柱、柱顶分块、主桁架分块、次桁架分块、嵌补杆件的顺序进行。吊次和高空操作大大减少,提高了安装效率和质量。     

Discrete size optimization of steel trusses using a refined big bang–big crunch algorithm

This article presents a methodology that provides a method for design optimization of steel truss structures based on a refined big bang–big crunch (BB-BC) algorithm. It is shown that a standard formulation of the BB-BC algorithm occasionally falls short of producing acceptable solutions to problems from discrete size optimum design of steel trusses. A reformulation of the algorithm is proposed and implemented for design optimization of various discrete truss structures according to American Institute of Steel Construction Allowable Stress Design (AISC-ASD) specifications. Furthermore, the performance of the proposed BB-BC algorithm is compared to its standard version as well as other well-known metaheuristic techniques. The numerical results confirm the efficiency of the proposed algorithm in practical design optimization of truss structures.     

体育场工程钢结构管桁架现场焊接技术

介绍了山西体育中心主体育场工程现场焊接内容和特点及焊接难点,从焊接材料、焊接设备、工人、操作工艺、焊缝质量检查等方面具体阐述了钢结构管桁架现场焊接技术,并指出了焊接作业安全注意事项,为同类工程施工积累了一定经验。     

SINO大型磨机吊装施工模拟分析

SINO大型磨机具有体积大和质量大的特点,根据钢管桁架刚度形成过程,基于有限元理论,对磨机吊装施工进行数值计算分析,并将施工现场动态监测值与数值计算分析进行对比。研究表明:该数值模拟方法是有效和准确的。在数值模拟计算的依托下工程顺利完成,证明该数值模拟方法可靠合理。     

西宁曹家堡机场T2航站楼钢结构安装技术

西宁曹家堡机场T2航站楼钢结构工程具有气候环境恶劣、现场条件极为有限、桁架结构复杂、倾斜钢柱安装难度大、结构稳定性差等特点.根据工程总体施工计划和工程特点,屋盖钢结构采用分段拼装、原位安装的施工方案.重点介绍了起重机械配置方案、支撑格构架设计方案、钢柱和桁架的吊装方案、测量控制方案.实践证明,所采取方案保证了桁架安装满足要求.     

安哥拉某倒锥壳水塔高空现浇水箱施工技术

安哥拉国内的倒锥壳水塔水箱多采用预制提升工艺安装,渗漏情况比较严重.为了改善不足,参照水箱提升工艺,经过计算不同工况荷载,设计出可整体提升的悬挑斜桁架支撑体系,从而实现了某倒锥壳水塔水箱高空现浇施工.详细介绍了该项目的桁架系统设计、桁架提升准备、桁架整体提升、桁架固定、高空现浇、桁架拆除等施工步骤.通过在实际工程中应用悬挑斜桁架支撑体系下高空现浇倒锥壳水塔施工技术,达到提高施工安全性、质量易控制、提高可操作性的目标.     

Mathematical similarities in engineering network analysis

This paper examines the proposition that structural trusses and pipe networks for water supply are closely related in a mathematical sense. It shows that in terms of representation, physical quantities, constitutive equations, analysis problem formulations and methods of analysis they both belong to the same class of nonlinear potentiated networks, the truss being a special linear case for problems of analysis. The analysis of nonlinear potentiated networks may therefore be efficiently performed by linearization of the relevant nonlinear quantities and the iterative use of well-known truss analysis methods. The commonality established between structural trusses and water supply systems has potential for exploitation in respect of other network-related problems of optimum design, reliability evaluation and design for resilience.     

A HIGHER ORDER EXPANSION METHOD FOR OPTIMUM DESIGN OF STRUCTURES FOR SPECIFIED FUNDAMENTAL EIGENVALUE

A higher order expansion method is presented for optimum design of structures for specified fundamental eigenvalue. The design function, fundamental eigenmode and total volume are expressed in terms of the Taylor series expansion with respect to the specified fundamental eigenvalue. A solution with null design function, where all the eigenvalues degenerate to null, is chosen as a trivial initial solution, and higher order terms are incorporated. By using the proposed method, a set of optimum designs for a wide range of fundamental eigenvalues is easily found. The proposed method is applied to an Euler-Bernoulli beam and expanded forms are presented analytically for a simply supported beam. The method is then extended to a plane truss, and the results are compared with those by an optimality criteria method.