【作者】 翁方文；

【导师】 赵灿晖；

【作者基本信息】 西南交通大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 众所周知,桥梁是公路交通网络的重要组成部分,是公路系统的咽喉和重要枢纽。对于整个公路交通网络,桥梁无论跨度大小,只要在地震中发生严重损毁,都有可能导致交通网络的瘫痪,从而严重影响灾后抗震救灾工作,汶川地震即是一个鲜明的例子。从这一意义来说,高烈度山区中、小跨度梁式桥的抗震问题与大跨度桥梁同等重要。因此,本文在对比分析桥梁结构形式,桥梁地形和跨径对桥梁地震响应特点的影响基础上,提出了高烈度区中小跨径梁式桥的抗震概念设计原则。1)运用梁格法建立了简支梁桥地震响应特性分析所用的基本动力模型,在此基础上运用CAD for VBA自动建模程序建立了本文分析所用的计算模型,分析了同跨径不同结构形式中小跨径梁式桥地震响应特点。2)分析了同结构形式不同跨径中小跨径梁式桥地震响应特点。3)对比分析了中小跨径梁式桥在不同地形下的地震响应特点,讨论了中小跨径梁式桥的地形适宜性,得出在宽浅型地形下,优先选用桥面连续简支梁桥；在V型地形下优先选用连续梁桥或刚构-连续组合梁桥。4)讨论了地震作用下碰撞对中小跨径梁式桥地震响应的影响,碰撞作用减小了桥墩顺桥向内力,而对桥墩横向内力的影响比较复杂。5)运用正交分析方法分析了桥梁结构形式,桥梁地形,桥梁跨径及地震烈度对桥梁地震响应的影响程度。基于以上分析,结合传统的桥梁抗震设计观点,提出了高烈度区中小跨径梁式桥抗震概念设计原则。更多还原

【Abstract】 As well known, bridge is the throat of road system, which is an important part of road traffic network. No matter how long the brige is, once damaged, there would be a paralysis in road traffic network, WENCHUAN earthquake is a clear example in which the damage of bridges had once affected the relief work seriously. For this sense, seismic design of medium and small span of beam bridge and long-span bridges are equally important in high earthquake intensity area. Therefore, this article provided the seismic conception design principle,which based on the research of the influence of the earthquake response with the change of bridge structure forms, terrain and span.1) Establish the model of the beam bridge seismic response charac-teristics analysis with the method of CAD for VBA automatic modeling procedures and girder case. On this basis, this article analyzed the bridge seismic response characteristics with the difference of structure form.2) Analyze the seismic response characteristics of seismic design of medium and small span of beam bridge with the same span, whose structure forms are different.3) Put forward the bridge suitability of structure form of small and medium-size span beam pumping bridge, which based on the discussion of seismic response characteristics. It is concluded that the terrain suitability and, deck continuous beam bridges are selected in priority in the type of wide shallow terrain; continuous beam bridges or rigid frame-combined continuous beam are selected in priority in V-shaped terrain.4) Discuss the earthquake the influence of small and medium-sized span seismic response with the effect of collision. The influence of the transverse internal force of bridge piers are complex, and collision reduce the longitudinal internal force of bridge piers.5) Analyze the influence degree of the bridge structure forms, the terrain, bridge spans and earthquake intensity by orthogonal analysis, which effect on the bridges. Based on the above analysis, combining the traditional bridge seismic design viewpoint, the seismic concept design principles of small and medium-sized span beam bridge with high earthquake intensity are put forward.更多还原