门形刚架人行天桥的设计及优化

Design and Optimization of Door-type Rigid-frame Pedestrian Crossing

在人行天桥的设计中,采用门形刚架结构代替传统的简支钢箱梁,可以显著提高结构竖向振动基频,从而减小梁高,提升景观效果。该文以天津市南京路人行天桥改建工程为背景,论述了结构选型的过程。为了利用旧桥偏弱的桩基础和承台,设计中对多种优化思路进行了试算,最终确定为两铰门形刚架结构形式。墩梁固结处则采用柱穿梁的方法保证了主梁和墩柱的有效连接。

In the design of the pedestrian crossing,the door-type rigid-frame structure is used to replace the traditional simple-supported steel box beam obviously able to enhance the vertical vibration basic frequency of the structure so as to decrease the beam height and upgrade the landscape effect.Taking Tianjin City Nanjing Road Pedestrian Crossing Reconstruction Project as the background,the article discusses the selection process of the structure.In order to utilize the weak pile foundation and base slab of the old bridge,many optimizing thinking are tested and calculated in the design finally to determine the two-hinged-door rigid frame structural type.The pole-through-beam method is used at the concretion of pier and beam to guarantee the efficient connection of the main beam with the pier pole.