桩-土-结构相互作用对大跨度连续刚架钢桁拱桥地震响应影响研究

以广州新光大桥为例,研究软弱分层土、较软分层土、较硬分层土和岩石地基与群桩相互作用下大跨度连续刚架钢桁拱桥动力特性以及地震响应。研究表明在各种地震时程激励下,不同地基土对大跨度连续刚架钢桁拱桥拱肋以及V形刚架的内力和位移影响很大。随着地基土刚度的增加,在横桥向、顺桥向和竖向地震激励下,主拱肋和边拱肋上弦杆、V形刚架靠边跨斜腿轴力基本呈递减趋势,而V形刚架面内和面外弯矩随地基土刚度变化的规律性不强。

Study of Influences of Pile-Soil-Structure Interaction on Seismic Response of Long Span Continuous Rigid-Frame and Steel Truss Arch Bridge

Taking the Xinguang Bridge in Guangzhou as an example,this paper conducts a study of the dynamic behavior and seismic response of long span continuous rigid-frame and steel truss arch bridge under interaction of weak layered soil,weaker layered soil,harder layered soil,rock foundation and group piles.It is found in the study that different foundation soils have considerable influences on the internal forces and displacement of the arch ribs and V-shape rigid frames of the long span continuous rigid-frame and steel truss arch bridge under different seismic time-history excitations.With the increase of rigidity of the foundation soils,the axial forces of the upper chords of the main and side arch ribs and slant legs of the V-shape rigid frames on side of the side spans basically tend to decrease step by step under seismic excitations transverse to,along and normal to the bridge.However,the variations of the in-plane and out-of-plane moment of the V-shape rigid frames do not have obvious regularities with the variations of the rigidity of the foundation soils.