体外索加固连续刚构桥梁极限应力增量计算方法研究  

Study on Calculation Method of Ultimate Stress Increment of Continuous Rigid Frame Bridge Reinforced by External Prestressed Tendon

作　　者：史天亮 邬晓光[2] SHI Tianliang;WU Xiaoguang(Taiyuan Design Institute,China Railway Engineering Design Consulting Group Co.Ltd.,Taiyuan 030013,China;Laboratory for Bridge and Tunnel of Chang’an University in Shaanxi Province,Xi’an 710064,China)

机构地区：[1]中铁工程设计咨询集团有限公司太原设计院,太原030013 [2]长安大学桥梁与隧道陕西省重点实验室,西安710064

出　　处：《铁道建筑》2020年第2期30-34,共5页Railway Engineering

基　　金：国家自然科学基金(50908017);陕西省交通运输厅科技项目(13-25K,18-19T)。

摘　　要：针对现有体外索极限应力增量规范公式在连续刚构桥梁加固计算时存在的局限性,本文建立等截面与变截面连续刚构桥梁的有限元模型,利用模型计算结果分析规范不合理部分的原因并提出相应修正方法。通过对比规范公式修正前后与有限元模型的计算结果,发现本文提出的修正方法能较准确地计算体外索加固连续刚构桥梁的极限应力增量。Aiming at the limitation of the existing code formula for ultimate stress increment of external prestressed tendon in the reinforcement calculation of continuous rigid frame bridges,the finite element models of continuous rigid frame bridges with constant section and variable sections were established in this paper,and the reasons of unreasonable part of the code were analyzed by using the calculation results of the model and the corresponding correction method was put forward.By comparing the calculation results of the code formula and the finite element model before and after the modification,it is found that the modification method proposed in this paper can calculate the limit stress increment of the continuous rigid frame bridge strengthened by external prestressed tendon more accurately.

关 键 词：连续刚构桥梁 体外索加固 极限应力增量 计算方法 规范公式 公式修正 

分 类 号：U448.14[建筑科学—桥梁与隧道工程]