可调节误差套筒节点受力性能有限元分析

Finite element analysis of mechanical properties of error-adjustable sleeve connection

针对中小跨度单层空间网格结构,提出可调节误差的套筒节点,该节点通过螺纹连接,可重复拆卸与拼装,且能够进行角度误差和长度误差调节,便于安装施工。为研究该类节点的受力性能,基于ANSYS建立节点实体模型,对其进行受拉、受压和受弯有限元分析,考察节点各部件的受力状态和破坏机理。通过参数分析,研究节点焊接球壁厚、接头壁厚、套筒壁厚、内外衬环壁厚和接头间隙等对其承载力的影响规律。研究结果表明:节点薄弱区位于内外衬环连接处;随着焊接球壁厚的增大,节点的受拉、受压及受弯承载力均逐渐增大;接头壁厚增大,节点各项承载力均逐渐增大,但当壁厚增大至接头半径的1/2后,节点承载力基本不变;增大套筒壁厚,节点承载力逐渐增大,但增幅会逐渐减缓;内外衬环最小壁厚对节点的刚度和承载力影响较小;接头间隙的存在对节点的各项承载力和刚度影响较小。

In this paper,an error-adjustable sleeve connection was proposed for spatial grid structures with medium and small span.The proposed connection can be disassembled and assembled repeatedly through threaded connection.It shares the abilities for adjusting the angle error and length error,which is convenient for installation and construction.To investigate the mechanical properties of the connection,the solid model of the connection was established based on ANSYS.The finite element analysis of the connection subjected to tension,compression and bending was carried out to evaluate the stress status and failure mechanism of each part of connection.According to the parameter analysis,the influence of the thicknesses of welded ball,joint,sleeve,inner and outer ring and joint gap on the bearing capacity of the connection was conducted.The results indicate that the weakness of the connection locates at the inner and outer ring.With the increasing of welded sphere wall thickness,the tensile,compressive and flexural capacity of connection increase gradually.The increasing of the joint wall thickness will rise the bearing capacity of the connection.However,once the wall thickness reaches to 1/2 times of the joint radius,the bearing capacity of the connection will not change.With the increasing of sleeve wall thickness,the bearing capacity of the connection is getting large gradually,but the rate of increase will slow down.The minimum wall thickness of the inner and outer ring makes little effect on the stiffness and bearing capacity of the connection.The joint gap has little effect on the bearing capacity and stiffness of the connection.