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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。
According to the design experience of steel box girders at home and abroad, three kinds of optimal structural forms of diaphragm are selected, and the finite element method is used to establish the finite element model of steel bridge slab. The joint between the U- The influence of the optimal structural form of different diaphragm on the fatigue stress at the arc notched part of the diaphragm was obtained by stress amplitude of two kinds of structural details under the wheel load. The results show that the small transverse ribs between the diaphragms can effectively reduce the stress amplitude of the two structural details, but the influence of the optimized structure on the details of the arc gap of the diaphragms is smaller than the details of the welded ends of the U- . The stress amplitude of the two structural details after the inner baffle was set decreased. Among them, the upper edge of the inner baffle was 20 mm from the top of the bridge deck, and the lowermost one was the design form of the bottom of the U rib and the welding end of the transverse baffle 20 mm The setting of the curved notched stiffeners has a great influence on the stress amplitude at the two structural details of the weld seam ends and the arc-shaped notches, reducing the possibility of fatigue cracking in the structural details.