CAJ | 학술논문

六沾铁路宣天特大桥主桥为钢管混凝土拱加劲三跨连续梁桥,主跨为100 m.主梁为双纵梁的"Π"形双向(局部三向)预应力混凝土结构,钢管混凝土加劲拱圈由2条相互平行的拱肋及横向联结系构成,拱肋为变高度钢管混凝土桁架,拱圈平联采用"ж"形空心钢管桁架,吊杆采用钢绞线体系.计算主梁应力、挠度、自振特性及钢管混凝土的钢管及混凝土应力;经试算,吊杆预张力、安全系数均满足要求.根据有限元分析结果,对拱一梁结合部进行设计改进:主梁上翼缘增加4束纵向短束;加强纵梁上翼缘普通钢筋布置;优化竖、横向预应力根数和布置.采取先梁后拱满堂膺架的施工方案.
륙첨철로선천특대교주교위강관혼응토공가경삼과련속량교,주과위100 m.주량위쌍종량적"Π"형쌍향(국부삼향)예응력혼응토결구,강관혼응토가경공권유2조상호평행적공륵급횡향련결계구성,공륵위변고도강관혼응토항가,공권평련채용"ж"형공심강관항가,조간채용강교선체계.계산주량응력、뇨도、자진특성급강관혼응토적강관급혼응토응력;경시산,조간예장력、안전계수균만족요구.근거유한원분석결과,대공일량결합부진행설계개진:주량상익연증가4속종향단속;가강종량상익연보통강근포치;우화수、횡향예응력근수화포치.채취선량후공만당응가적시공방안.
The main bridge of the Xuantian Bridge on Liupanshui-Zhanyi Railway is a threespan continuous girder bridge stiffened by the concrete-filled steel tubular(CFST)arches and with a main span 100 m.The main girder of the bridge is of a"Π"-shape two-way(locally threeway)prestressed concrete structure having double longitudinal girders and the stiffening CFST arch rings ate made up of the two parallel arch ribs and lateral bracing systems.The arch ribs are the CFST trusses with variable cross sections and are braced by the"ж"-shape hollow steel tube trusses.The hangers are the steel wire strand systems.The stress,deflection,nature vibration characteristics of the main girder and the stress of the steel tubes and concrete of the structure are calculated.Through the calculation,the pretensioning force and safety coefficient of the hangers are proved to satisfy the requirements.The design of the connections of the arches and girders is improved in accordance with the finite element analysis:in the upper flanges of the girders,four numbers of the short longitudinal strands are added,the arrangement of the ordinary reinforcement there is strengthened,the arrangement of the numbers of the vertical and transverse prestressing strands is also optimized and finally the bridge is to be constructed on stages by way of erecting the girders first and arches late.