钢管脚手架力学计算问题的研究

运用若干计算假定，对钢管脚手架计算中的扣件、钢管、荷载等繁杂的力学性能进行了简化，解决了脚手架计算中强度、稳定的问题，为推广使用此类钢管脚手架提供了理论和计算依据。     

长距离蒸汽管网设计软件研究

从工程应用角度出发，考虑蒸汽管道水力热力特性的相互影响和过热蒸汽热力参数的变化，建立了长距离蒸汽管网的水力热力耦合计算模型。以Qt5.10.0为开发平台，耦合IAPWS-IF97计算公式开发了蒸汽管网设计计算软件，介绍了程序设计流程、软件的管网绘制及设计计算模块、散热计算模块和水蒸气参数计算模块。利用该软件对某实际工程长距离蒸汽管网进行了设计计算。     

桥梁桥墩异形承台的受弯计算

以一座桥梁桥墩异形承台的计算为工程背景，对承台进行了抗弯计算，并与按照深受弯构件以及有限元的计算结果进行了对比，最后对运用“新桥规”按照“撑杆-系杆体系”计算承台提出了几点建议，从而为类似计算奠定基础。     

∏形主梁无背索斜拉桥剪力滞效应分析

以某座∏形断面预应力混凝土主梁的无背索斜拉桥桥型方案为背景，采用三维实体有限元数值计算方法，分析探讨了自重恒载、活载、轴向力、预应力等荷载及其组合下的剪力滞效应问题。研究该种桥型剪力滞系数的分布规律，计算不同荷载及其组合下剪力滞系数。得到了该种桥型方案剪滞系数的一些重要结论，为该桥型方案的设计计算提供了重要的依据，也为同类桥型的剪力滞效应计算提供了参考资料。     

利用弹性稳定理论进行压弯结构稳定性分析

本文提出了不同支承方式的压弯构件稳定计算的方法，并举例分析计算，简便、快捷，为塔机等构件计算提供了一个好的方法。     

上海某地铁车站十字换乘节点计算分析

以上海某地铁车站十字换乘节点计算为例，对其计算软件、计算范围及约束设置等作了论述，计算结果表明，新建的线路结构换乘节点区的结构内力均在现有配筋的承载力范围内，可以满足承载要求。     

考虑桩土共同作用的连续拱桥计算

介绍了在连续拱桥的计算中，对下部结构的几种处理方式，即：简化成拱脚固结、全长考虑桩土共同作用、部分长度考虑桩土其同作用。并以浙江沿海地区的某工程实例为背景，利用“二、三维桥梁结构计算分析通用程序ASBEST＇98”为计算工具，建立了5跨连续拱桥的有限元模型．分析了全长考虑桩土共同作用的方法和其他方法的不同处，该方法的计算结果与手算结果比较接近。     

多塔大底盘结构设计体会

多塔大底盘结构设计中，要注意计算模型的选择、计算程序参数定义和多塔定义，并且对计算输出结果加以认真分析和比较。本文以宁波市镇海骆驼薪区多塔大底盘结构设计为实例，介绍了地下室结构抗震构造设计和后浇带、膨胀加强带的布置等裂缝控制方法，通过整体计算及分塔计算结果的数据比较，总结了多塔大底盘结构设计方法。     

地震地表变形三维有限元数值分析

基于地震断层弹性位错理论，采用地震位移水平分布的抛物线模型，研究了三维有限元方法在活断层发震产生地震变形预测计算中的应用，并以敦煌莫高窟为例进行了实际计算。研究及计算结果表明，该方法计算地震变形简明实用，具有计算精度高、边界可控、模型可调的特点，能使模拟更切合实际。     

基础隔震结构的力学计算讨论

简要介绍了结构的力学计算发展，阐述了基础隔震结构动力计算的几种常用模型，通过对模型的分析比较，得出各种计算模型的优缺点，为结构的动力计算提供了依据。     

斜拉桥塔梁同步施工技术研究与应用

合生大桥为无上横梁独塔双索面斜拉桥,在施工阶段的设计基准风速作用下,裸塔塔顶会发生几十公分的位移,上塔柱和下塔柱的根部处均有可能产生较大的拉应力导致混凝土开裂。采用塔梁同步施工方案,一方面可以减小裸塔的高度,另一方面也可增加塔柱封顶后的结构刚度和重量,这两方面都可以有效地减弱塔柱的风振响应,在不需要增加减振设备的情况下就可保障施工期间的塔柱结构安全。本文介绍了塔梁同步施工技术的研究与应用。     

Comparison of wind‐induced dynamic property of super‐large cooling tower considering different four‐tower interferences

Dynamic amplification effects caused by tower‐group interference is the most critical causes of wind‐induced destructions of super‐large cooling tower (SLCT), and four‐tower combinations are the most common tower‐group combining form. However, the dynamic amplification effects of SLCT of different four‐tower arrangements have not been studied systematically so far. The highest (220 m) SLCT in the world was taken as the target to conduct SLCT wind pressure measurement under 320 wind tunnel test conditions. Firstly, the stability performance under the design wind loads was analyzed. Then, the dynamic time‐history analysis was carried out, and the distribution characteristics of peak factors and values of extreme response were discussed. Furthermore, with a new concept parameter “tower‐group wind vibration coefficient” for the wind‐resistance design of SLCT, the distribution laws of two‐dimensional (2D), one‐dimensional (1D), and global tower‐group wind vibration coefficient were revealed under different four‐tower interferences. On these bases, we recommend the design parameters for wind‐resistance study of SLCT and the priority of four‐tower combination forms. The study showed that the dynamic effects of SLCT under different four‐tower arrangements were significantly different from each other and the tower‐group wind vibration coefficients proposed in this paper can reflect the interference effects of tower‐group more efficient than traditional design method. The results may become a useful database for the wind‐resistance design of SLCT and provide clues for the optimization of four‐tower arrangements in power plants.     

主塔塔型对大跨度钢塔斜拉桥地震反应的影响

为研究钢塔斜拉桥在不同塔型下的地震反应,以实际桥梁工程为背景,从斜拉桥抗震设计的角度出发,利用反应谱方法分析了独柱塔、H型塔和钻石型塔三种塔型对斜拉桥地震反应的影响。结果表明:独柱式钢塔斜拉桥的纵飘周期最长,H型塔最短;独柱式塔的横向侧弯周期也最长,钻石型塔最短。纵向+竖向地震作用下,H型塔及其基础的地震弯矩较大,但塔顶和塔梁间地震位移较小;横向+竖向地震作用下,钻石型塔的塔柱地震轴力较大,独柱式塔较小,独柱式塔的基础地震弯矩需求也较小。总体而言,在7度地震区,对于钢塔及其基础,地震均不会控制设计。     

附着式塔机所能达到的最大附着高度

将塔式起重机塔身结构简化为桁架,运用有限元分析软件SAP2000对附着式塔机进行整体建模.通过对塔身结构进行应力计算,解决塔机附着实际应解决的问题,得出H3/36B型塔机的最大附着高度.     

谈辽代东平房塔的砖雕塔饰

着重阐述了辽宁朝阳的辽代砖塔——东平房塔的塔身雕饰的特点,分别从塔身雕饰的位置分布、形式等方面进行论述。阐述了此塔雕饰的艺术特点和它的独特之处,为今后相关专家对该塔的研究提供了相关资料和依据。     

500kV新崖门大跨越输电塔的结构设计

介绍了500kV新崖门大跨越输电塔的工程概况。给出了大跨越输电塔静力计算的原则,比较了大跨越输电塔有电梯井筒与无电梯井筒时的动力特性,分析了新崖门大跨越与原崖门大跨越之间的刚度差异,计算了大跨越输电塔的风振系数。最后,给出了大跨越输电塔的节点构造、地脚螺栓、休息平台以及走道等细部设计。本大跨越输电塔的设计方法可以作为同类大跨越输电塔的设计参考。     

南京长江三桥钢索塔制作精度管理系统研究

南京长江三桥为国内大跨度斜拉桥首次采用钢塔柱设计,钢塔柱节段间通过金属接触和高强螺栓连接两种方式传力,塔柱的线型主要在塔柱端面机加工过程中进行控制。通过介绍南京长江三桥钢塔柱精度管理系统研究成果,为国内今后大型桥梁钢塔柱精度控制提供借鉴。     

利用悬浮抱杆组立±660kV直流铁塔施工

对利用500mm×500mm悬浮抱杆组立±660kV直流铁塔施工进行了介绍,通过对塔型结构和抱杆特性进行分析,结合±660kV塔型相关参数制定了组立铁塔方案,并作了具体阐述,为组立类似直流工程的塔型积累了宝贵的经验。     

Assessment of damages and repair of antenna tower concrete foundations

Deterioration of antenna tower foundations is fast becoming an issue of critical importance. A great effort has been carried out to develop the international standards for design and construction of antenna towers and antenna-supporting structures. Comparatively little attention has been directed toward the design against failure of buried tower components. In this paper a case study is introduced for the investigation of 51 defective foundations of self-supported and guyed antenna towers. Factors affecting the durability of tower anchorages and foundations are discussed. These include corrosion of tower parts in direct contact with soil, inadequate reinforcement detailing of tower foundations, and lack of maintenance of concrete footings. Repair methods of tower foundations are introduced along with tower shoring systems used to maintain the structural capacity during the repair process. Furthermore, precautions necessary for preventing failure due to corrosion of buried tower components and deterioration of anchor blocks and foundations are also discussed. An innovative system of surface anchor blocks for guyed towers is evaluated and compared to the conventional anchoring systems.     

Decision support for tower crane selection with building information models and genetic algorithms

Tower cranes are major construction equipment that is highly demanded in construction projects. The planning process for tower cranes utilization starts in early stages of the construction projects. Poor selection could incur extra costs on the construction projects or cause delays in project duration. The planning procedures for tower cranes include selection, allocation and operation. This paper presents a framework for the selection of tower cranes types and locations at construction sites. The framework considers three main models: 1) decision making model to select the tower crane type, 2) optimization model for the selection of the ideal number and location of tower cranes, and 3) 4D simulation model to simulate tower crane operations. Several clash detection scenarios are presented to assure the safety operation of the tower crane group. A case study is shown herein to demonstrate the capabilities of the developed framework.