钢箱梁新型构造对横隔板弧形缺口部位疲劳应力影响研究  

RESEARCH ON THE INFLUENCE OF NEW STRUCTURE ON FATIGUE STRESS OF ARC GAP OF DIAPHRAGM IN STEEL BOX GIRDER

作　　者：叶枝[1] 吉伯海[1] 王益逊 孔祥明[1] 

机构地区：[1]河海大学土木与交通学院,南京210098

出　　处：《工业建筑》2017年第5期22-26,16,共6页Industrial Construction

基　　金：国家自然科学基金项目(51478163);江苏省交通科学研究计划项目(2014Y02)

摘　　要：根据国内外钢箱梁的设计经验,选取3种不同的横隔板优化结构形式,通过有限元方法建立钢桥面板的空间有限元模型,计算U肋与横隔板连接焊缝末端和横隔板弧形缺口2种构造细节在车轮荷载作用下的应力幅值,得出不同横隔板优化结构形式对横隔板弧形缺口部位疲劳应力的影响。研究结果表明:设置横隔板间小横肋可有效降低两处构造细节的应力幅,但该优化结构对横隔板弧形缺口细节的影响较U肋与横隔板连接焊缝末端细节小;设置内隔板后两处构造细节的应力幅均有所下降,其中采用内隔板上缘距桥面板顶板20 mm、下缘距U肋与横隔板焊接末端20 mm的设计形式效果最佳;设置弧形缺口加劲肋对焊缝末端和弧形缺口两处构造细节的应力幅均有较大影响,减小了构造细节发生疲劳开裂的可能性。Based on the experiences for steel box girder design at home and abroad, three optimized structural forms of diaphragm were selected to establish the spatial finite element model of steel bridge deck and calculate the stress amplitude of two construction details, which including the weld ends of U-rib and diaphragm and diaphragm arc gap under wheel load, the influence of different optimized structural forms of diaphragm on the arc gap was obtained. The results showed that setting small transverse ribs between diaphragms could deeply reduce the fatigue stress amplitude of two construction details, but the influence of the optimized structure on the details of diaphragm arc gap was smaller than that of U-rib and diaphragm web joint weld-end ;the setting of inner diaphragms could reduce the stress amplitude of two construction details,the best distance between inner diaphragm upper-edge and bridge deck was 20 mm, the distance between inner diaphragm lower-edge and weld ends was 20 mm;the setting of stiffener on are gap could reduce the stress amplitude and the possibility of fatigue cracking of two construction details

关 键 词：正交异性钢桥面板 横隔板 构造细节 疲劳应力 有限元模型 

分 类 号：U441.4[建筑科学—桥梁与隧道工程]