钢管混凝土拱桥拱肋吊装中的拱轴线形控制-桥梁与隧道工程专业论文.docxVIP

武汉理工大学硕士学位论文At 武汉理工大学硕士学位论文 At the present time，with the development of the configuration analysis， architecture materials and building technology，CFST arch bridges’span becomes greater and greater．Because of it’S mechanical capability and convenience in building,CFST arch bridges are exerted largely on the span of 200m．But its own characters make the instability in building．So it is necessary to control it strictly． At the present time，the way of building CFST arch bridges is being suspended by cables．So we can use the Kalman filter,which is used greatly in Cable Stayed bridges,tO control CFST arch bridges’rib shape because it’S building process likes what of Cable Stayed bridges’．It’S reported someone had tried to do it．but not very perfectly．CFST arch bridges’rigidity is much lower than Cable Stayed bridges．This will make much great windage and must take into account all the effects synthetically and systemicly． This thesis contalns these contents of the control of CFST arch bridges’rib shape mainly： 1． Based on the No．3 bridge of Jiang Han，it analyses the effects，which may decide the rib shape，such as the effect of crosspiece on the rib，the plane excursion of the tower，the cable’S non—linear problem made by gravity，the elongation of cable and SO Oil． 2．At the same time，the paper also discusses how to cut down the windage made by these effects． 3．Cocluding the stess in the cables and the displacement of the rib’S top． 4．After observating the windage between the design and the practice，we can adjust the cable’S strain in construction to make the main arch coincide with the supposed axis． KEYWORDS：CFST arch bridge；Kalman Filter；Progress analytical method Rectify a deviation of end·point theory；shape of the rib II 武汉理工大学硕士学位论文第一章绪论 武汉理工大学硕士学位论文 第一章绪论 1．1钢管混凝土 1．1．1钢管混凝土结构的发展概况 钢管混凝土(CFST)结构就是将混凝土注入薄壁钢管内形成的一种介于钢 结构和钢筋混凝土结构之间的一种新型组合材料结构。19世纪中期，人们就开 始在需要密集布筋的混凝土杆件中预埋熬体刚度较大的钢管来代替布筋，此后 不久，钢管混凝土结构就得到迅猛推广。1879年，英国赛文铁路桥首次采用了 钢管混凝土桥墩，但当时在钢管中灌注混凝土的目的在于钢管防锈。1901年， Swell．J．S发