临沂市北京路沂河桥桥头堡结构设计分析

北京路沂河桥东、西两岸分别设置四座桥头堡,结构形式为四柱围合的框架结构,与拼宽桥桥墩共用承台桩基础。地震作用分析同时考虑建筑与桥梁设计的最不利荷载作用,对桥头堡在桥面位置、承台桩基础、楼顶平台3个薄弱部位进行重点分析。首先介绍了桥头堡主体结构在地震作用下不会与拼宽桥发生碰撞；其次分析了合并承台后会改变群桩基础中各桩位的受力情况,受桩-土-结构相互作用体系的影响会增大拼宽桥墩身荷载及桩基础总地震荷载；最后对观光厅立柱及核心筒进行抗震分析,并介绍了避免顶部平台剪力滞效应所采取的措施。

Design and Analysis on Bridgehead Structure of Yihe River Bridge in Beijing Road of Linyi City

Four bridgeheads are set on the east and west banks of Yihe River Bridge in Beijing Road. The structural forms are the frame structure surrounded by four columns, which shares the foundation of base slab pile with the piers of the widened bridge. At the same time of analyzing the earthquake action, the most unfavorable load action of building and bridge design should be considered. Three weak positions of bridge deck position, base slab pile foundation and roof platform are specially analyzed. Firstly, it is introduced that the main structure of bridgehead will not collide with the widened bridge under the earthquake action. And then, it is analyzed that the force of each pile position in the pile group foundation will be changed after the combination of base slab. The impact of pile - soil - structure interaction system will increase the pier load of the widened bridge and the total earthquake load of pile foundation. Finally, the anti-earthquake analysis on the columns and the core tube of the sightseeing hall is carried out, and the measures to avoid the shear lag effect of the roof platform are introduced.