基于整体节点理念的钢盖梁与混凝土墩柱连接结构优化设计

Optimal Design of Connection Details of Steep Cap Beam and Concrete Pier Column Based on Integral Joint Concept

针对传统钢盖梁设置套筒外包混凝土墩柱方案墩梁连接位置刚度突变、应力集中及施工定位精度要求高的问题,基于梁柱整体节点理念,以门式框架墩为例,提出一种钢盖梁与钢套筒连接结构优化方案。该方案将连接位置处钢盖梁和钢套筒腹板设计为整体节点板,钢盖梁和钢套筒翼缘板加劲肋一一对应,并将现场接头设置在钢盖梁侧。以某公路工程匝道桥为背景,采用有限元软件分析其门式框架墩采用传统方案与优化方案的受力性能,并将优化方案应用于实桥。结果表明:该优化方案传力顺畅,结构应力集中程度较低,构造合理;该优化方案施工较为简单,容错性更好,具有良好的推广应用前景。

The steel cap beam and concrete pier column are usually socket-connected and encased with concrete,however the abrupt stiffness change,notable stress concentration as well as challenging positioning accuracy are still critical issues related with this type of connection.To address these issues,an optimized steel socket connection is proposed,which is developed from the integral joint concept.With the case of portal-frame pier,the steel cap beam and the webs of the steel socket are designed as integral gusset,the steel cap beam and stiffeners in the flanges of steel socket are arranged in line,and the cast-in-situ joint are placed on the side of steel cap beam.Based on the ramp bridge of a highway project,numerical simulation was carried out to compare the load bearing behaviors of the portal-frame piers when using the conventional and optimized connections,respectively.Subsequently,the optimized connection has been applied to real project.It is shown that the optimized connection transfers loads smoothly and leaves lower stress concentration in the structure,indicating an effective configuration.The optimized connection is easy to be constructed and reveals a better fault tolerance,and will get wide application in the future.