波形钢腹板-UHPC组合连续箱梁桥结构性能分析
Structural Performance Analysis of Corrugated Steel Web-UHPC Composite Continuous Box Girder Bridge
石云冈 1李立峰 2钟卫 1皮立军1
作者信息
- 1. 湖南省交通科学研究院有限公司 长沙 410015
- 2. 湖南大学土木工程学院 长沙 410082
- 折叠
摘要
为解决传统预应力混凝土 PC箱梁桥跨中挠度过大和腹板开裂的难题,文中提出"大跨径波形钢腹板-UHPC组合连续箱梁桥"的新桥型结构,通过有限元建模和计算分析,对波形钢腹板-UHPC组合连续箱梁桥结构性能进行研究,并论述该桥型结构的性能优势.研究表明,波形钢腹板-UHPC组合连续箱梁桥具有以下特性:①结构恒载内力占比明显降低;②结构沉降适应性较好;③结构横向刚度弱于竖向;④偏载对顶板应力影响明显,对底板应力影响次之,对主梁竖向位移影响小;⑤该桥型结构在梁高、顶板厚度和顶板横向预应力方面具有较大优势.随着UHPC材料的推广应用,波形钢腹板-UHPC组合连续箱梁有望成为大跨连续梁桥具有竞争力的桥型方案.
Abstract
To solve the problems of excessive midspan deflection and web cracking in traditional pres-tressed concrete box girder bridges,a new bridge structure of"Long span corrugated steel web-UHPC composite continuous box girder bridge"is proposed.Through finite element modeling and computa-tional analysis,the structural performance of corrugated steel web-UHPC composite continuous box girder bridge is studied and the performance advantages of this bridge structure are discussed.The re-search shows that,corrugated steel web-UHPC composite continuous box girder bridges have the fol-lowing characteristics:①Compared to traditional PC or corrugated steel web PC composite continuous box girder,the proportion of internal force under dead load of the structure is significantly reduced;②The structure has good adaptability to foundation subsidence;③The lateral stiffness of the struc-ture is weaker than the vertical stiffness;④The eccentric load has a significant impact on the stress of the top deck,followed by the stress of the bottom slab,and has little impact on the vertical displace-ment of the girder;⑤This bridge structure has significant advantages in beam height,top plate thick-ness,and transverse prestressing on the top plate.With the promotion and application of UHPC ma-terials,the combination of corrugated steel webs and UHPC continuous box girder is expected to be-come a competitive bridge type solution for long span continuous beam bridges.
关键词
波形钢腹板/超高性能混凝土/组合箱梁/结构性能Key words
corrugated steel web/UHPC/composite box girder/structural performance引用本文复制引用
出版年
2024
NETL
NSTL
万方数据