大直径焊钉连接件抗剪性能试验

发布时间：2018-06-11 20:06

本文选题：组合结构桥梁 + 焊钉连接件　；参考：《同济大学学报(自然科学版)》2015年12期

【摘要】：为了解决部分情况下组合结构桥梁钢-混结合面焊钉布置过密的问题,通过直径22mm,25mm和30mm焊钉的抗剪承载性能模型试验比较分析了直径25mm和30mm大直径焊钉相对于直径22mm常规焊钉破坏模态、承载力、刚度和变形性能的差异,并对国内外桥梁规范中焊钉抗剪承载力设计式对于大直径焊钉的适用性进行了评估.研究结果表明,相对于直径22mm焊钉,直径25mm和30mm焊钉的抗剪承载力平均增大约14%和42%,抗剪刚度平均增大约35%和106%.《公路钢结构桥梁设计规范(送审稿)》、规范Eurocode 4和规范AASHTO LRFD中的抗剪承载力设计式均可较为保守地计算大直径焊钉的抗剪承载力,其中Eurocode 4最为保守.试验值与设计值的比值随焊钉直径的增加而减小.
[Abstract]:In order to solve the problem of overcompactness of welded nails on steel-mixed joint face of composite structure bridge in some cases, The difference of failure modes, bearing capacity, stiffness and deformation properties of diameter 25mm and 30mm large diameter welded nails compared with that of conventional diameter 22mm welded nails is analyzed through the model tests of shear bearing capacity of 22mm ~ 25mm and 30mm nails, and the difference of failure modes, bearing capacity, stiffness and deformation properties of large diameter 25mm and 30mm large diameter welded nails are analyzed. The applicability of the design formula of shear bearing capacity of welded nails to large diameter welded nails in bridge codes at home and abroad is evaluated. The results show that relative to diameter 22mm welding nail, The shear bearing capacity of diameter 25mm and 30mm welded nails increased by about 14% and 42%, and the average shear stiffness increased about 35% and 106% respectively. < Code for Design of Highway Steel structure Bridges (draft) >, Code Eurocode 4 and Code AASHTO LRFD can be used for the design of shear bearing capacity. The shear capacity of large diameter welded nails is calculated conservatively. Eurocode 4 is the most conservative. The ratio of test value to design value decreases with the increase of nail diameter.
【作者单位】：同济大学土木工程学院;
【分类号】：U446

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