双弧形钢设计参数对横向钢阻尼装置阻尼性能的影响

对主要应用于斜拉桥的横向钢阻尼装置的阻尼性能进行了仿真分析,研究了双弧形钢的高度、通孔间距、有效宽度,T形段高度和有效宽度与装置阻尼性能之间的关系。结果表明:当横向钢阻尼装置的横向地震位移较大时,可设计高度较高、有效宽度较小的双弧形钢,T形段有效宽度与双弧形钢有效宽度的最优比值为2.0,宜采用非同心圆设计;采用同心圆设计时双弧形钢通孔间距与其高度的比值约为0.5。当装置横向水平反力较大时,双弧形钢可设置较大的通孔间距和有效宽度,而其高度不宜过高。减小双弧形钢的高度,增大其有效宽度,有利于装置得到较大的竖向拉拔力。为了提高横向钢阻尼装置的阻尼耗能能力并减小装置的横向后屈曲刚度比,双弧形钢的高度宜较小,通孔间距宜较大,而其有效宽度应适当增大。

Influence of Design Parameters of Double Arc Steel on Damping Performance of Transverse Steel Damping Device

The damping performance of the transverse steel damping device mainly applied to cable-stayed bridge was simulated and analyzed. The relationship between the damping performance and the design parameters of double arc steel,such as height,through-hole spacing and effective width,was studied. The results show that when the transverse seismic displacement of the transverse steel damping device is large,the double arc steel with large height and small effective width should be selected. The optimum ratio of T-section effective width to double arc steel effective width is 2.0,and non.concentric circle design is suitable. In concentric circle design,the ratio of through.hole spacing to height of double arc steel is about 0.5. When the horizontal reaction of the device is large,the double arc steel can be set up with larger through.hole spacing and effective width,and its height should not be too high. By reducing the height of double arc steel and increasing the effective width,the device can get a larger vertical drawing force. In order to improve the damping dissipation capacity and reduce the transverse post.buckling stiffness ratio of transverse steel damping device,the height of the double arc steel should be smaller,the spacing of the through.hole should be larger,and the effective width of the double arc steel should be increased appropriately.