城市高架桥梁多柱式门式墩设计方案研究  

Study on Design Scheme of Multi-column Portal Pier for Urban Viaduct

作　　者：庞孟丽 PANG Mengli(Zhengzhou Branch of China Railway Engineering Design and Consulting Group Co.,Ltd.,Zhengzhou 450001,Henan,China)

机构地区：[1]中铁工程设计咨询集团有限公司郑州设计院,河南郑州450001

出　　处：《建筑施工》2024年第12期2119-2121,2126,共4页Building Construction

摘　　要：为了研究城市高架桥梁多柱式桥墩盖梁与墩柱的连接方式,以南昌市九洲高架东延工程为背景,以四柱式桥墩为例,建立有限元模型,分析3种约束下的桥墩受力特点。首先了解不同荷载工况下盖梁和墩柱的内力变化趋势;然后模拟不同墩高及边墩刚度对盖梁和墩柱的受力影响。结果表明,盖梁与墩柱全刚接可通过减少边柱尺寸或增加墩高,降低盖梁与墩柱的节点内力;边柱柱顶设置单向支座,减少超静定次数,边柱受力减少明显,但盖梁中柱柱顶及墩柱弯矩明显增加;盖梁在中柱中间设置断缝,盖梁中柱柱顶负弯矩显著降低,但盖梁跨中弯矩增加较多。因此,给出了不同情况下不同连接方式的选取建议,可为类似工程提供参考。To study the connection between the capping beam and pier column of multi-column piers in urban viaducts,the east extension project of the Jiuzhou Viaduct in Nanchang serves as a case.A four-column pier is modeled using finite element analysis to examine the mechanical behavior under three constraint conditions.The internal force variations in the capping beam and pier column under different loading conditions are analyzed,followed by simulations exploring the effects of varying pier heights and side pier stiffness.Results indicate that reducing the size of the side column or increasing the pier height lowers the internal force at the joints.The side column forces are notably reduced by adding unidirectional supports at the top,which also reduces the degree of static indeterminacy,though this increases the bending moments at the top of the middle column and pier.The negative bending moment at the top of the middle column decreases significantly by introducing a break joint in the capping beam,though bending moments at midspan increase.Recommendations for selecting different connection methods under various conditions are provided as a reference for similar projects.

关 键 词：城市高架桥梁 多柱式门式墩 倒T形盖梁 刚接 断缝 有限元分析 

分 类 号：TU997[建筑科学—市政工程]