对接梁Benchmark模型的建模与动态特性分析

采用相对描述方式建立了Sandia国家实验室结构连接件与界面研究中提出的对称连接梁Benchmark问题的对称和反对称动力学模型,解析分析了系统的模态特性.解析模型中连接段采用挠性根部法模拟其变形势能,根部挠性参数则根据试验结果识别.并采用虚拟材料法模拟连接段进行了有限元分析.两种方法均获得了该Benchmark模型与其模态试验结果一致的动态特性.

锅炉钢架大板梁的焊接技术及应用

通过多年制造锅炉钢架的实践,修正原对称X型坡口并利用焊接反变形控制,减少大板梁对接的翻面次数,达到图纸平面度要求,提高了生产效率。

中小型桥式起重机安装工艺改进

介绍在中小型(额定载荷小于50吨)桥式起重机主梁吊装及端梁安装中,前后两种不同装配工艺的差别,并详细地叙述了如何提高桥式起重机的机械安装质量和施工效率。

铜绿山铜铁矿新副井井筒破岩柱定向技术实践

盲竖井延深时,需要求出井筒中心,根据井筒中心,指导盲竖井下部轨道的安装,本技术利用上部轨道梁,采用钢丝定向,量测井筒中心,操作方便实用,达到指导罐笼轨道梁对接。

Development of cooperative system bridges

Cooperative system bridges comprise several basic structures that act jointly to improve structural characteristics. We delved into the historical development of cooperative system bridges. Cooperative systems are classified as different-load cooperative systems and same-load cooperative systems by distinguishing the modes of load distribution. For different-load cooperation,individual basic structures are at different positions in the direction along bridge axis and carry the loads separately. While for same-load cooperation,all basic structures overlap in geometrical locations and support the entire loads conjointly. The choosing of span ratios between basic structures,the design of connections of different-load cooperative systems were discussed as well as optimizations of relative rigidity for same-load cooperative systems which greatly influence structural characteristics. The general situation and several structural measurements of several cooperative bridges were demonstrated. This information can assist engineers in developing their concepts in cooperative systems and can lead to more efficient and economical cooperative bridges.