福建省建筑科学研究院建筑设计生产基地大跨度跨层转换桁架结构创新设计

Innovative Design of Long-Span Cross-Layer Transfer Truss for Fujian Academy of Building Research Co.,Ltd.Base

创新性提出转换桁架弦杆滑动连接方案,保留转换桁架竖向承载力的同时释放其抗侧刚度,转换桁架竖向承载功能与主体结构水平抗侧功能分离,为大跨度转换结构工程提供一种新颖的解决思路;综合对比传统大跨度转换桁架刚性连接及上、下弦滑动连接三个方案的优劣,确定采用下弦滑动连接方案;对比分析三种下弦滑动节点设计方案的优劣,确定采用下弦杆居中式节点形式;细化设计滑动节点构造,保证其可靠滑动的同时对混凝土楼面梁起支撑作用;采用ABAQUS对托板进行有限元应力分析,分析结果表明,托板处于弹性受力状态,且其受力可近似按悬臂板计算;规划下弦滑动方案施工次序,确保该方案的可实施性。

This paper innovatively proposes a scheme of transfer truss with bottom chord sliding connection,which releasing horizontal stiffness while retaining vertical stiffness of transfer truss.The vertical resistance function of the transfer truss is separated from the lateral resistance function of main structure,providing an original solution for large-span transfer truss design in structural engineering.By comparing the advantages and disadvantages of three schemes of large-span transfer truss with rigid connection,top chord sliding connection and bottom chord sliding connection,the bottom chord sliding connection scheme is determined;The advantages and disadvantages of three schemes of bottom chord sliding connection are compared and analyzed as well,and the sliding joint is superior to be centered.The bottom chord sliding joint is designed to ensure the function of sliding while supporting the main structure floor beam.Finite element analysis of the steel supporting plate of the joint has been carried out,result shows that the plate is basically in elastic state,its stress can be approximately calculated as cantilever plate;The construction sequence of the scheme has also been planned,making sure the its feasibility.