一种混合结构拱脚的设计与计算分析

Design, Calculation and Analysis of a Composite Structural Arch Foot

摘要:

钢混结构因其能充分发挥钢、混各自材料的性能优势，近年来被广泛应用于桥梁结构中。以七都二桥为工程背景，概述了混合结构拱脚的设计要点，介绍了七都二桥拱脚结合部的构造特点，采用有限元软件ANSYS建立了拱脚节段，分析了结合部各构件的受力情况。研究结果表明：拱脚钢混过渡区域由于刚度突变呈现较明显的应力集中现象；横梁作为结合部主要传力构件，表现为明显的边缘局部受力状态；提出的拱脚钢混结合部构造能够较好地传递拱脚内力。

Abstract:

Steel-concrete composite structure has been widely used in bridge structure due to its ability to fully utilize the performance advantages of steel and concrete materials in recent years. Based on the Qidu Bridge II, the design essentials of the composite structural arch foot are outlined, and the structural characteristics of the connection part at the arch foot are introduced. Finite element software ANSYS is used to established the arch foot model for analyzing the stress of each component. The research results indicate that the steel-concrete transition area at the arch foot exhibits a significant stress concentration due to sudden stiffness changes. And as the main force transmitting component of the connection, the crossbeam exhibits obvious local stress states at the edges. The steel-concrete composite structure of arch foot proposed can transmit the internal force of arch foot better.