摘要
研究目的:为便于制造与安装,大跨钢桁连续梁桥往往在采用整体节点,腹杆与主桁节点连接时,腹杆插入节点板中,采用高强螺栓两面连接。由于仅连接杆件的两个面,另外一面(或两面)不直接承受节点板传递的荷载,必然存在剪力滞效应。通过建立钢桁梁腹杆的几种典型截面的有限元模型,研究两面连接腹杆端部的应力分布,从而掌握腹杆端头板件应力分布的规律并用于指导钢桁梁桥节点设计。研究结论:杆件端部最大正应力均发生在螺栓群末端;一般来说,杆件板厚越大,螺栓连接沿杆件长度方向的排数越多,最大正应力与名义正应力的比值越小;截面形式变化、板件厚度变化不会对最大剪应力的发生部位产生影响;杆件中部,截面应力趋于均匀,剪力滞效应不显著。
Research purposes： To facilitate the manufacture and installation,the integrated node is often adopted to the large-span continuous steel truss girder bridges.The web member is connected with the node of the main truss commonly by using high-strength bolts on two friction sides.As only two sides are connected,the other sides do not directly bear the load transferred from the gusset plate,and the shear lag effect appears.In order to analyze the shear lag effect and master plate stress distribution pattern on the end of web member and guide the design,the finite element models for some typical cross-sections are establish to study the stress distribution on the end of the two-sides-connected web member.Research conclusions：The maximum normal stress on the end of truss often occurs on the end of high-strength bolts.Generally speaking,the thicker the web member is and the more the row connected by bolt along the length direction of web member is,the small the ratio between maximum normal stress and nominal normal stress is.The changes of cross-section forms and thickness will not change the area of maximum shear stresses.At middle part of web member,the normal stress goes to uniform and the shear lag effect is not obvious.
出处
《铁道工程学报》
EI
北大核心
2010年第12期47-50,63,共5页
Journal of Railway Engineering Society
关键词
钢桁梁
腹杆
高强螺栓
节点
应力
truss girder
web member
high-strength bolt
node
stress
作者简介
艾宗良，1980年出生，男，工程师。
