宽箱梁空间力学阡为的分析及试验应用研究.pdf

重庆交通大学硕士学位论文宽箱梁空间力学阡为分析及试验研究姓名:吴姗姗申请学位级别:硕士专业:桥梁与隧道工程指导教师:向中富 20110415 摘要随着对桥梁结构简化和施工方便要求的提高,国内外建造的预应力混凝土梁桥中,采用能适应较宽桥梁的大悬臂单箱多室宽箱截面越来越多。这种桥梁具有腹板间距大、横向翼缘宽、箱壁薄等特点。本文通过采用有限元软件分析和试验模拟的手段,来研究宽箱梁的空间力学行为,了解宽箱梁在静力荷载作用下的空间受力情况、内力横向传递机制、剪力滞效应等。本文首先介绍宽箱梁桥的发展概况、研究现状和发展动态,明确研究的方向和内容。然后分析宽箱梁的力学特性,详细阐述了箱形截面的力学特性和箱梁的剪力滞效应,为下文的分析奠定理论基础。本文通过ANSYS有限元软件分析,得到宽箱梁在自重、自重+均布荷载、自重+集中荷载、自重+对称荷载作用下的内力分布情况、横向传递机制及剪力滞效应。最后通过模型试验加载,测得控制截面上的应变,再整理数据进行分析,得到控制截面上的内力分布情况。与有限元软件分析的结果相比,两者虽然存在一定偏差,但其变化趋势一致,结果吻合性较好,说明有限元软件能较好的模拟宽箱梁的空间受力情况,可以作为深入分析宽箱梁空间受力的有效方法。本文给出了宽箱梁空间力学行为分析结果,对今后宽箱梁桥的设计具有重要的理论意义和实用价值。关键词:单箱多室宽箱截面;试验模拟;空间受力;内力横向传递;剪力滞效应 ABSTRACT 黝the inereasing demand forbridge structure simplification andconstruction convenient,the prestressed concrete girderbridge athome andabroad,cantilever width of asingle boxmulti-room boxsection thatadaptable to awidebridge tobemOleand more ofbridge hasmany characteristicsuch asspac吨of theweb is large,horizontal width oftheflange islarge,box wallisthinand the researchofmechanical behaviorof thespacewide boxby the finiteelement analysis modeland testsimulation,understandspatial loadsituationofwi‘leboxunder static loads,horizontal internalforceWansmission mechanism,shear lag effectand SO OIL Thispaper describesthedevelopment ofwide boxgirderbridge,current statusand development trendsatflrst'clear anddefinitedirectionand content analysis themechanicalpropertiesof晰deb0】(,detailed description ofmechanical properties and shearlag effectof谢debox,make theoreticalbasis fortheanalysis below. Inthispaper,analysis by ANSYS,we getthespatial loadsituationof谢de box under selfweight,self weight+uniform load,selfweight+concentrated load,self weight+symmetrical load,and get horizontalinternal forcetransmissionmechanism, shear lag effectof wide ,measured thestrain on thecontrolled scc'tionsby modelexperiment,then processed dataand make analysis,obtains theinternalforces pared wiⅡlfiniteelement analysisresults,although there arc some