开孔受压钢板受力特性分析及补强方法探讨

通过非线性有限元计算,对引起开孔受压钢板极限承载力下降的主要因素进行了分析.对应用四种补强方法钢板承载力的提高程度分别进行了综合比较和分析,结果表明,采用补强板全面积补强效果最佳.     

福建省体育馆工程施工技术研究

福建省体育馆工程是建设部重点实施技术示范工程,在施工中结合工程施工特点和创优目标,研究、开发、应用了四大类共10余项重点实施新技术,完成了推新任务和创优的目标。     

ZCY系列液压打桩锤

介绍了一种新型高效低公害桩工机械－ZCY系列液压锤，对其功能结构和性能特点进行了深入分析。该机采用液联合控制，将氮气爆炸能和重力势能作为对预制桩的打击能量，实现冲击能和冲击频率的无级调节，提高了控制性能和打击能力，提高了设备的适应性。     

不同斜撑方式对格构式异形铁塔的影响

结合具体的工程概况，利用大型有限元计算程序，分析对比了格构式铁路的不同斜撑方式对结构变形的影响，从而确保铁塔在正常使用状态下不发生过大的变形和极限状态下能保证整体稳定性。     

薄壁离心钢管混凝土结构及其质量控制

薄壁离心钢管砼结构发挥了钢及砼工种材料的特性 ,本文就此种管道结构的技术、经济特征、应用范围和生产质量等方面的内容展形评述。     

锡槽工程钢结构安装施工工艺

锡槽是浮法玻璃生产线的关键设备之一，它主要是由钢结构组对安装而成，安装质量好坏关系到玻璃生产的质量好坏，因此针对钢结构组装部件多、组件复杂，且安装精工控制难的特点，经两条生产线的施工实践，本钢结构安装施工工艺做到了安装程序准确，精度控制措施得当，保证了锡槽的安装质量，有较大的实用意义。     

灵江特大桥栈桥设计与计算

结合工程概况,从梁Ⅰ40a工字钢检算、Ⅰ16工字钢栈桥横向分配梁、Ⅰ28b支座垫梁验算、钢管桩自由长度及稳定性验算、栈桥钢管桩单桩承载力计算等方面介绍了栈桥的设计与计算过程,以供类似桥梁工程的设计参考。     

Numerical simulation of concrete encased steel composite columns

This paper investigates the behaviour of pin-ended axially loaded concrete encased steel composite columns. A nonlinear 3-D finite element model was developed to analyse the inelastic behaviour of steel, concrete, longitudinal and transverse reinforcement bars as well as the effect of concrete confinement of the concrete encased steel composite columns. The interface between the steel section and concrete, the longitudinal and transverse reinforcement bars, and the reinforcement bars and concrete were also considered that allowed the bond behaviour to be modeled and the different components to retain their profile during the deformation of the column. Furthermore, the initial overall (out-of-straightness) geometric imperfection was carefully incorporated in the model. The finite element model has been validated against published experimental results. The main objective of the study was to understand the structural response and modes of failure of the columns and to assess the composite column strengths against current design codes. The study covered slender, non-slender, stub and long concrete encased steel composite columns. The concrete strengths varied from normal to high strength (20-110 MPa). The steel section yield stresses also varied from normal to high strength (275-690 MPa). Furthermore, the variables that influence the composite column behaviour and strength comprising different slenderness ratios, concrete strength and steel yield stress were investigated in a parametric study. It is shown that the increase in structural steel strength has a small effect on the composite column strength for the columns having higher relative slenderness ratios due to the flexural buckling failure mode. The composite column strengths obtained from the finite element analysis were compared with the design strengths calculated using the American Institute for Steel Construction AISC and Eurocode 4 for composite columns. Generally, it is shown that the EC 4 accurately predicted the design strength for the concrete encased steel composite columns having a concrete cylinder strength of 30 MPa and structural steel yield stresses of 275 and 460 MPa, which are in the limits of the code, which otherwise, was generally conservative. The AISC predictions were quite conservative for all the concrete encased steel composite columns.     

某地铁线上水DN2000钢管顶管施工关键技术

以上海某地铁线上水DN2000顶管工程施工为例，从作业井的施工方法、钢管的焊接、沉降和隆起的控制等方面阐述了钢管顶管施工关键技术，经实践证明，具有显著的社会和经济效益。     

掺石灰石粉自密实混凝土性能的研究

研究了掺石灰石粉自密实混凝土的工作性能、力学性能和抗氯离子渗透性能。讨论了石灰石粉对高性能混凝土的影响,试验结果表明石灰石粉提高了高性能混凝土的工作性能和早期抗压强度,同时能有效地降低高性能混凝土的自收缩性能。