铁路桥梁钢管混凝土结构设计理论研究  

Theoretical Research of the Design of Concrete-filled Steel Tubular Structure of Railway Bridges

作　　者：徐升桥 邹永伟 Xu Shengqiao;Zou Yongwei(China Railway Engineering Consulting Group Co.,Ltd.,Beijing,100055)

机构地区：[1]中铁工程设计咨询集团有限公司,北京100055

出　　处：《铁道技术标准（中英文）》2019年第2期88-101,共14页Railway Technical Standard(Chinese & English)

摘　　要：铁路桥梁钢管混凝土结构具有使用环境复杂、跨度大、列车活载比重大等特点,结构的安全性、可靠性对保证列车运营安全极为重要。现行国内外铁路桥梁结构设计规范均缺少详细的条文内容,为开展铁路桥梁钢管混凝土结构设计理论的深化研究工作,分析哑铃形截面特征,提出中性轴位置特征高度及中性轴特征方程的概念,研究钢管混凝土截面脱空率对短柱轴压强度的影响,推导脱空高度计算公式和脱空高度限值,为钢管混凝土灌注质量验收标准提供了定量参数。结合国内外现有管节点疲劳试验研究成果,提出了管管节点、板管节点的疲劳强度计算公式,解决了铁路桥梁钢管混凝土结构的疲劳设计问题。The concrete-filled steel tubular structure of railway bridges is generally used under complex service environment.It is of great span and with live load of train accounting for a large proportion.The safety and relia-bility of this structure are very important to ensuring the safety of train operation.Nonetheless,in the codes for structural design of railway bridges currently existing home and abroad,there are no detailed provisions.To tackle this issue,this paper has carried out the in-depth research of the design theory of concrete-filled steel tubular structure of railway bridges.It has analyzed the characteristics of dumbbell-shaped section and proposed the con-cepts of the characteristic height and characteristic equation of neutral axis which can be used simply and accurate-ly to calculate the pure bending strength of dumbbell-shaped section.This paper has also analyzed the debonding effect of concrete-filled steel tubular section on axial compressive strength of short columns,deduced the calcula-tion formula of debonding gap and proposed the limit value of debonding gap.This has provided quantitative parameters for the quality acceptance standard of concrete-filled steel tubular construction.In combination with the research results of fatigue tests of current tubular joints at home and abroad,this paper has also put forward the fa-tigue strength formula for tubular joints and plate-tubular joints and thus solved the fatigue calculation problem of concrete-filled steel tubular structures of railway bridges.

关 键 词：铁路桥梁 钢管混凝土 轴压强度 纯弯强度 脱空高度 哑铃形截面 

分 类 号：U443[建筑科学—桥梁与隧道工程]