铁道标准设计2024，Vol.68Issue(3)：106-112,7.DOI:10.13238/j.issn.1004-2954.202303260004
高速铁路大跨度低高度预应力混凝土连续梁设计研究
Research on Design of Long-span and Low Height Prestressed Concrete Continuous Beam of High-speed Railway
摘要
Abstract
In order To reduce the height of railway long span prestressed concrete continuous beams and expand their scope of application,this article proposes a reasonable span ratio and structural dimensions of a low height continuous beam with a main span of 100 m,and the calculation results meet the requirements of the specification.By comparing and analyzing the continuous beam with a main span of 100m in common high-speed railways,the effects of span mix ratio and structural parameters on the structure are systematically studied.The advantages and disadvantages of large span and low height continuous beams and the recommended construction values are summarized.The research results show that:(1)The concrete consumption of low height continuous beams is more economical compared to traditional continuous beams,with a reduction of about 20%per linear meter of concrete consumption with the same span;(2)Due to the decrease in beam height,the main beam stiffness of low height continuous beams has slightly decreased,but the creep camber value has significantly decreased after construction,with a reduction of about 60%;(3)For low height continuous beams with a main span of 100 m,it is recommended that the span length should be between 70 m and 80m,not less than 60 m;(4)The top beam height of a low height continuous beam pier with a main span of 100 m should not be less than 6m,and the recommended value range is 6.0 m to 6.5 m.The midspan beam height should not be less than 3.0 m,and the recommended value range is 3.0 m to 3.5 m.关键词
高速铁路/铁路桥/预应力混凝土/低高度连续梁/刚度/徐变/跨度配合比/构造参数Key words
high-speed railway/railway bridge/prestressed concrete/low height continuous beam/stiffness/creep/span mix ratio/construction parameters分类
交通工程引用本文复制引用
王冲冲..高速铁路大跨度低高度预应力混凝土连续梁设计研究[J].铁道标准设计,2024,68(3):106-112,7.基金项目
中铁第一勘察设计院集团有限公司科研项目(院科17-18) （院科17-18）
