摘要
为建立高速铁路常用跨度桥梁设计理论和方法,进行该类桥梁设计参数、简支梁动力性能简化判定方法、桥梁线形控制技术及整孔箱梁的制造、运输、架设技术研究。研究结果表明,桥面宽13.0 m,腹板间距6.7 m左右时,箱梁顶板和腹板的受力较为合理;24 m3、2 m箱梁预应力传力长度分别为1.1倍、1.2倍梁高;时速350 km客运专线铁路桥32 m简支箱梁梁体基频限值为150/L。为保证桥梁线形,应控制结构使用阶段上、下缘应力差在4 MPa内,施加预应力时混凝土的强度和弹性模量应达到设计值,施加二期恒载的时间间隔为60 d。箱梁制造时,梁端隔墙采用变截面平顺过渡,并合理地设置温控参数。
To establish the design theory and methods for the common span bridges used for high-speed railway,the researches have been made for the design parameters,simplified judgment method of dynamic behavior of simply-supported girders,geometric shape control,casting,transportation and erection techniques of full-span box girders of such type of the bridges.The results of the researches show that the force conditions of the top slab and webs of a box girder can be rational if the deck width is 13.0 m and the spacing between the webs is about 6.7 m.The prestress transferring length of the 24-m span and 32-m span box girders should be respectively 1.1 times and 1.2 times of the depth of the girders and the limit value of base frequency of the 32-m span simply-supported box girders for 350 km/h passenger dedicated railway should be 150/L.To ensure the geometric shapes of the bridges,the difference of stress in the upper and lower flanges in the service stage should be controlled within 4 MPa.Before the prestress is applied,the strength and elastic modulus of concrete should reach the design values and the time interval of application of the second phase dead load should be 60 d.In the process of casting of the box girders,the diaphragms at the girder ends should have smooth transition,using variable sections and the temperature control parameters should be set rationally
出处
《桥梁建设》
EI
CSCD
北大核心
2011年第2期62-65,共4页
Bridge Construction
基金
国家高技术研究发展计划(863计划)课题(2008AA030704)
关键词
高速铁路
设计参数
动力性能
线形
桥梁设计
桥梁施工
high-speed railway
design parameter
dynamic behavior
geometric shape
bridge design
bridge construction
