多跨连续矮腿V型刚构的设计对策

Design Countermeasures for Multi-span Continuous Low-leg V-type Rigid Frame

该文以宁波市福庆路后塘河大桥为例,通过对矮腿V型刚构桥不同基础形式的计算结果分析,得出在基础水平刚度较大情况下,总体温度及收缩徐变是影响V型刚构桩基轴力分布不均匀的主要原因。根据计算结果,提出采用大直径的单排桩基形式,以降低桩基的水平刚度,解决桩基轴力不均匀分布的问题。最后,结合设计意图,提出一些有效的施工及构造保证措施,确保桥梁的顺利建成。

Taking Ningbo Fuqing Road Houtang River Bridge as an example,the article analyzes the calculation results of the low-leg V-type rigid frame bridge in the different foundation types,and attains that the master temperature and the shrinking creep are the main causes to affect the uneven distribution of pile foundation axial force of V-type rigid frame under the condition of the larger horizontal rigidity of foundation.Based on the calculation result,the article puts forward the use of large-diameter single-row pile foundation to reduce the horizontal rigidity of pile foundation and to solve the uneven distribution of pile foundation axial force.Finally,the article puts forward some effective construction and structural guaranteeing measures according to the design meanings for ensuring the smooth completion of bridge construction.