铁路规范下圆形拉弯构件的强度检算研究  

Study on strength checking of circular tension-bending member under the assumption of railway code

作　　者：王聪[1] 鄢勇[1] 

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《高速铁路技术》2017年第5期15-19,共5页High Speed Railway Technology

摘　　要：现行铁路规范中无钢筋混凝土结构拉弯构件的设计及验算方法,但在具体工程中又常出现此类受力状态。公路和建筑规范中虽有拉弯构件的设计及验算方法,但其适用的截面形状有限,对圆形拉弯构件的强度检算无法提供有效的借鉴。因此,有必要针对圆形拉弯构件受力特性开展研究,得出一套适合铁路的计算方法。本文遵从铁路规范的常用假定和普通钢筋混凝土结构的受力特性,通过一系列微积分计算及平衡方程推导,得到铁路规范下圆形截面构件大、小偏拉的分界判断,及大、小偏拉和纯弯构件的检算方法及公式,填补了规范上相应内容的空白,并给出了圆形偏拉与偏压构件的异同点,对类似工程检算具有一定参考价值。There is no design or checking method for the reinforced concrete members in the current railway codes,but this kind of force state often appears in some projects. Though there is design and checking methods for tension-bending member in the Highway Code and Building Code,its applicable sections are limited,so it cannot provide an effective reference for the strength checking of the circular tension-bending members. It is necessary to carry out the research on the stress characteristics of the circular tension-bending member and get a set of calculation method suitable for the railway. In accordance with the common assumption of the railway codes and the mechanical characteristics of reinforced concrete members and through a series of calculus calculation and balance equation derivation,this paper gets the boundary judgment of large and small eccentric tension of circular-section member under the assumption of railway specification and calculation method and formula of pure bending member to fill the gaps in the corresponding code,and also gives the similarities and differences between the circular eccentric tension member and bias member,which provides an important reference for the similar projects.

关 键 词：铁路规范 圆形 拉弯 纯弯 检算 

分 类 号：U442.51[建筑科学—桥梁与隧道工程]