摘要
以某黄河大桥主桥(70 m+11×120 m+70 m波形钢腹板PC组合多跨连续箱梁桥)为背景,按合龙、张拉体外预应力钢束、施加二期恒载、施加活载等施工及营运流程,进行波形钢腹板预应力混凝土组合桥梁的上部结构顶底板混凝土应力、波形钢腹板应力及结构刚度(挠度)的有限元静力分析,验算其是否符合现行规范要求。结果表明,波形钢腹板的钢板厚度可以满足要求;墩顶处顶板不满足抗裂要求。正常使用极限状态下箱梁波形钢腹板竖向剪应力满足规范限值,但安全系数不高;波形钢腹板屈曲验算得到的剪切屈服强度为31 MPa,安全系数很大。
Based on the main bridge of a Yellow River Bridge(70 m+11×120 m+70 m PC combination multispan continual box girder bridge with corrugated steel webs) and its construction and operation process such as closure,tensioning of external prestressed cable,imposing of the second stage dead load and live load,the concrete stress of bottom and top plates of superstructure of the bridge,the steel web stress and the structure rigidity(amount of deflection) were obtained by finite element static analysis and computation,which were checked with the existing regulatory requirements.The result indicates that(1)the thickness of corrugated steel webs satisfies the request while the top plate of pier roof does not meet the requirements of crack resistant;(2) the vertical shear stress of the box girder's corrugated steel webs satisfies the standard limit but the safety coefficient is not high under the normal use limit condition ;(3)the shear yield strength of the flexure from checking computation is 31 MPa and the safety coefficient is very large.
出处
《公路交通科技》
CAS
CSCD
北大核心
2009年第4期42-46,53,共6页
Journal of Highway and Transportation Research and Development
基金
国家自然科学基金资助项目(50078014)
关键词
桥梁工程
波形钢腹板
有限元
静力分析
组合箱梁
屈曲
bridge engineering
corrugated steel web
finite element
static analysis
composite box girder
flexure
