【作者】 彭河星；

【导师】 赵跃宇；

【作者基本信息】 湖南大学 ， 桥梁与隧道工程， 2007， 硕士

【摘要】 大跨度斜拉钢管混凝土拱桥是最近几年才出现的一种斜拉桥与钢管混凝土拱桥组合而成的新型桥,它不但展示了斜拉桥和拱桥的各自特点,使两种桥型的优点得到互补,而且实现了桥梁美学上的一次突破—拱上作用斜拉索使桥梁显得更加美观。目前,人们对大跨度桥梁的抗震研究开始重视,并取得了一些研究成果。然而,对于大跨度斜拉钢管混凝土拱桥这一新型桥梁结构,相关的抗震研究还非常少,这对这类桥型力学性能的全面认识以及合理设计是不利的。本文以湘潭四大桥为工程依托,针对大跨度斜拉钢管混凝土拱桥抗震性能,进行了以下几个方面的研究。1.总结了现有非一致地震激励模型的研究,并基于Harichandran&Vanmarche一维相干函数模型,采用矢量随机过程理论,提出了与实桥工程地质条件相适应的非一致地震激励模型。2.以湘潭四大桥为工程背景,利用ANSYS对其进行了三维非一致激励下的地震响应分析。同时探讨了主拱肋内倾角、吊杆布置形式、横撑型式、斜拉索在拱上位置、宽跨比和主拱弦管刚度等因素对大跨度斜拉钢管混凝土拱桥的抗震性能的影响。3.利用考虑了几何非线性的空间梁单元和小应变、大变形条件下的钢管混凝土的弹塑性空间梁单元,对大跨度斜拉钢管混凝土拱桥进行了几何与材料非线性的时程分析,对比研究了大跨度斜拉钢管混凝土拱桥与相同跨径中承式拱桥的几何非线性抗震性能,同时应用最大反应塑性率的概念对大跨度斜拉钢管混凝土拱桥的材料非线性地震响应进了评价。4.利用多维随机振动理论,对比分析了大跨度斜拉钢管混凝土拱桥与相同跨径中承式拱桥的抗震性能。更多还原

【Abstract】 The long-span cable-stayed concrete filled steel-tubular arch bridge is a kind of new bridge structure form, which combines the cable-stayed bridge and the arch bridge harmoniously. It exhibits the respective merits of the cable-stayed bridge and the arch bridge, and makes two kinds of advantages of bridge type get to add mutually. It is also a breakthrough in the aesthetics of bridge that the cables fasten on the arch rib make the bridge more beautiful. But as same as other type long-span bridges, The problem of anti-seismic is unavoidable to the cable-stayed arch bridge. And there is also a little of study reference about anti-seismic of the cable-stayed arch bridge. In this dissertation, based on the forth bridge of XIANGTAN, certain problem relating to seismic response behavior of the cable-stayed arch bridge are studied.They included:1. The recent studies on asynchronous seismic model are summarized. And based on Harichandran&Vanmarche one dimension coherence model and the geological conditions, the asynchronous seismic model is developed by one dimension stochastic vector process, and the spatial relation is included in the model.2. With cable-stayed arch bridge which is the forth bridge of XIANGTAN for engineering background, make use of large and general finite element soft ANSYS to analysis the seismic response behavior under the spatial asynchronous seismic model. And on the basis of the linear finite element model, the effect of different factor such as the sloping angle of arch rib , the form of the hangers, the arrangement form of the lateral brace, ratio of the width to the span, the stiffness of the arch rib, the cables position on the arch rib etc is discussed.3. The geometric nonlinear seismic response behavior of the cable-stayed arch bridge is analysis. Based on the elastic-plastic stiffness matrix of concrete filled steel-tubular (CSFT), the material nonlinear seismic response behavior of the cable-stayed arch bridge is also studied. The different anti- seismic capability between the cable-stayed arch bridge and the same span tie-through arch bridge is studied. And based on the concept of the maximum response plastic rate, the estimate of material nonlinear seismic response behavior is developed.4. The linear stochastic seismic response analysis of the cable-stayed arch bridge and the same span tie-through arch bridge are studied and analysed.更多还原