摘要
某高速铁路桥梁由于受施工条件、环境保护、对孔等因素的限制,拟采用60 m跨度节段预制拼装梁方案。通过对比简支梁、连续梁两种结构形式,比选出合理的结构方案,并对其拼装方案及预应力布置、结构检算等进行分析研究。研究结果表明:(1)(60+60+60) m连续梁方案与60 m简支梁方案相比,混凝土方量减少1.3%,预应力含量降低0.8%,并具有梁高较矮、外形美观、整体性能好等优势;(2)(60+60+60) m连续梁采用一次拼装1对节段并张拉顶底板束、每拼装2对节段张拉腹板束的拼装方案及相应的预应力布置,减少了齿块模板用量、提高了截面抗剪能力;(3)(60+60+60) m连续梁采取的梁端构造措施,保证了梁端预应力的张拉空间,静活载造成的梁端转角最大为0.88‰,满足梁端转角的要求;(4)(60+60+60) m连续梁各计算指标均满足设计要求。
Due to construction conditions, environmental protection, and restrictions on holes, a high-speed railway bridge is planned to be constructed by precast segments assembling method. By comparing the two structural forms of simply supported beam and continuous beam, a reasonable structural scheme is selected, and its assembly program, prestressed arrangement and structural calculation are analyzed. The research results show that:(1) Compared with the 60m simply supported beam scheme, the(60+60+60) m continuous beam scheme reduces the concrete volume by 1.3% and the prestress content by 0.8%, and has the advantages of lower beam height, attractive appearance and good overall performance;(2)(60+60+60) m continuous beam adopts the assembly scheme of assembling one pair of segments at a time and tensioning the roof and floor bundles, and tensioning web bundles for every two pairs of segments assembled, and employs corresponding prestressing arrangement, which reduces the number of tooth block templates and improves shear resistance of cross section.(3) The beam end structural measures adopted for the(60+60+60) m continuous beam ensure the prestressed tension space of the beam end;and the maximum beam end rotation angle caused by static and live load is 0.88‰, which meets the requirements of the beam end corner;(4) The calculation indexes of the(60+60+60)m continuous beam all meet the design requirements.
作者
邢雨
周岳武
王永标
XING Yu;ZHOU Yuewu;WANG Yongbiao(Civil Engineering Design Research Institute,China Railway Design Corporation,Tianjin 300308,China)
出处
《铁道标准设计》
北大核心
2023年第1期152-156,174,共6页
Railway Standard Design
基金
中国铁路总公司科技研究开发计划重大课题(2016G002-H)
中国铁路设计集团有限公司科技开发课题(2019YY220607)。
关键词
高速铁路
预应力混凝土
箱形梁
连续梁
节段预制拼装法
方案比选
预应力布置
梁端转角
high speed railway
prestressed concrete
box beam
continuous beam
segmental prefabrication method
scheme comparison
prestressing arrangement
beam end angle
