半潜式钻井平台管道钢构支架极限强度研究

钢构支架是半潜式钻井平台管道支吊架的主要类型之一,钢构支架的极限强度是管道系统正常工作的重要保障。研究结构极限强度的方法有理论分析、有限元数值仿真和实验分析。在分析极限理论的基础上由静力法计算四种钢构支架试件的极限载荷;利用MSC软件对试件极限载荷进行数值仿真分析,并对有限元模型化技术进行讨论;对试件进行实验极限载荷测试,对比分析了三种方法测得的极限载荷。结果表明,三种分析方法计算得到结构的极限载荷基本一致,对于结构形式较为简单的结构通过理论分析可以得到简化解析解析解;数值仿真分析中采用合理的有限元模型化技术(结构有限元模型、边界、约束等)可得到精度较高的计算结果。

变电站户外钢构支架的腐蚀和防护研究

在分析变电站户外钢构支架腐蚀机理的基础上,对变电站户外钢构支架的防腐蚀技术发展进行了阐述,并提出了目前最先进、最简易的防腐方法,对今后变电站钢构支架的防腐蚀具有一定的指导意义。

火蒙分离式立体交叉支架计算

主要论述火蒙分离式立体交叉支架计算相关的方案,着重分析了其施工相关的计算公式和具体的施工技术应用,提出在火蒙分离式立体交叉支架计算中相关的技术措施。

桥梁翼板横向改道通车顶撑加固施工技术探讨

因赣江南大道下穿桥施工,南昌大桥西引桥需改道通车。车辆改道行驶后将改变南昌大桥翼缘板受力模式。为了确保南昌大桥结构安全,必须对南昌大桥翼板进行加固。对此,采用钢桁架进行顶撑加固施工。该文介绍了南昌大桥梁板加固施工技术,可供同行参考。

Design of Dissipative Braces for an Existing Strategic Building with a Pushover Based Procedure

The research presented in this paper deals with the seismic protection of existing frame structures by means of passive energy dissipation. An iterative displacement-based procedure, based on capacity spectrum, to design dissipative bracings for seismic retrofitting of the frame structures is described, and some applications are discussed. The procedure can be used with any typology of dissipative device and for different performance targets. In this work, the procedure has been applied, with both traditional pushover （load profile proportional to first mode） and multimodal pushover, to an existing RC （reinforced concrete） frame building. In the application, the buckling restrained braces have been used in order to prevent damages to both the structure and non structural elements. The use of multimodal pushover proves to be more effective than pushover based on single mode in case of medium rise RC frame building （higher than 30 m） but, once this building is retrofitted, and therefore regularized, with a bracing system, the difference between using monomodal or multimodal pushover becomes insignificant.