体外索单跨加固连续刚构桥梁极限应力增量研究  

Study of Ultimate Stress Increment of Single-Span Continuous Rigid Frame Bridge Strengthened by External Tendon

作　　者：贺书磊 HE Shule(Taiyuan Design Institute, China Railway Engineering Design Consulting Group Co., Ltd., Taiyuan 030013, 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,山西太原030013

出　　处：《沈阳大学学报（自然科学版）》2020年第3期245-251,257,共8页Journal of Shenyang University：Natural Science

基　　金：陕西省交通运输厅科技项目(13-25K);陕西省交通运输厅科技推广项目(18-19T).

摘　　要：为验证体外索极限应力增量的规范计算公式对连续刚构桥梁单跨加固情况的适用性,以等截面和变截面连续刚构桥梁为依托分别进行全桥、边跨及中跨加固.采用规范公式按简支结构和连续结构对加固跨在各工况下体外索的极限应力增量进行计算,建立有限元模型并进行分析,提取结果与规范公式进行对比分析.结果表明,无论按简支结构还是连续结构计算,规范公式都存在一定的不合理之处,无法直接用于连续刚构桥梁的单跨加固计算.对公式不合理的原因进行分析并给出修正建议.In order to verify the applicability of the standard calculation formula for the limit stress increment of the external cable to the single-span reinforcement of continuous rigid-frame bridges,full-bridge,side-span,and mid-span reinforcements were carried out on the basis of constant-section and variable-section continuous-rigid-frame bridges.The standard formula was used to calculate the ultimate stress increment of the external cable under the various working conditions according to the simply supported structure and the continuous structure.A finite element model was established and analyzed.The extracted results were compared with the standard formula.The results show that no matter whether the calculation is based on the simple support structure or the continuous structure,the standard formula has certain irrationality and cannot be directly used for the single-span reinforcement calculation of continuous rigid-frame bridges.The reasons for the unreasonable formula were analyzed and suggestions for correction are given.

关 键 词：连续刚构桥梁 体外索加固 单跨加固 极限应力增量 规范公式 

分 类 号：U445.72[建筑科学—桥梁与隧道工程]