【作者】 赵静；

【导师】 李睿；

【作者基本信息】 昆明理工大学 ， 桥梁与隧道工程， 2011， 硕士

【摘要】 我国是多震国家之一,处于多个地震活动区。地震给我们带来了巨大的人员伤亡和财产损失,其中桥梁作为生命线工程,一旦损坏会给震后的抢险工作带来困难,从而造成二次灾害,所以桥梁的抗震显得尤为重要。近年来国家加强发展西部公路建设,西部山区由于地形、地貌等原因,使得所建桥梁型式不同于平原地区,具有弯、坡、斜、高等特点,并且西部山区为高烈度地震区,这些不规则梁桥在荷载作用下特别是地震时与规则梁桥的的受力特点区别较大；细部构造是桥梁抗震的重要环节,其抗震设计的合适与否对桥梁的整体抗震性能起决定性作用。由于合理的结构型式和较强的细部构造可以大大的减轻甚至避免损伤发生的可能性,所以本论文针对这些问题进行了以下工作。首先,叙述了抗震设计方法和抗震设防标准的发展过程,介绍了抗震设计流程；阐述延性对桥梁抗震设计的重要性,对延性指标和影响延性的因素进行概述；阐述了概念设计对桥梁抗震设计的指导意义,采用概念设计对梁桥上部、下部结构型式和细部连接方式进行合理选取,有效的提高结构的抗震性能,减小抗震设计工作量。其次,以思茅-澜沧公路上的不规则梁桥为研究对象,运用SAP2000有限元软件对弯桥和斜桥中的影响因素进行参数分析,得出其动力特性与地震响应特点。最后,对桥梁总体布置中的影响因素进行分析,查看横坡、纵坡、半径、墩高等因素对梁桥的影响；不同桥墩型式的合理选用；不同桥面系结构对桥墩受力的影响；挡块与梁体间隙值和间隙材料的合理选取；纵向防落装置间隙值和刚度的合理选取；位于深水中桥墩的构造处理进行研究。通过对以上因素分析对比为桥梁抗震设计提供参考依据。本论文来源于云南省交通运输厅科技基金项目,“思茅～澜沧公路桥梁抗震技术研究”(项目编号：KKK0201006076),同时获得该项目基金的资助。更多还原

【Abstract】 China is one of the earthquake-prone countries, which is located in multiple seismic activity zones. Earthquake brings us great casualties and property losses. The bridge as a lifeline project once damaged would create difficulties to the rescue work after earthquake, thus resulting in secondary disasters. So the ability of earthquake resistant of bridge is extremely important.In recent years, China strengthens the development of western highway construction. Because of the terrain, topography and other reasons, the bridge types of western mountainous areas are different from the types of plain areas. With the features of bend, slope, oblique, high etc, the force affordability of these irregular bridges is quite different from the regular bridges especially in earthquake; the detailed structure is an important part of the bridge earthquake resistant, whether the seismic design is appropriate plays a decisive role on the overall seismic performance of bridges. As a reasonable structure type and strong detailed structure can greatly reduce or even avoid the possibility of injury, this paper addresses the following points.Firstly, it describes the development process of seismic design and thestandard seismic, introduces the seismic design process, and elaborates the importance of bridge seismic design and the ductility index and factors affect ductility. The guiding significance of conceptual design to the bridge seismic design is elaborated as well. Using the conceptual design to make a reasonable selection on the structure type of top part and lower part,and connection form of detail part of bridge can effectively improve the seismic performance of structures and reduce the workload of seismic design.Secondly, with the irregular bridge in Simao～Lancang Road as the object of study, the paper uses SAP2000 finite element software to analyze the factors affect curved bridge and oblique bridge, and obtains the dynamic characteristics and seismic response features.Finally, the paper analyzes the factors affect overall layout of bridges, checks the influence of cross slope, longitudinal slope, radius, the height of the piers; the reasonable selection of different types of piers; the influence of different bridge deck surface structures on the force affordability of pier deck; the reasonable selection of block and beam clearance valuesand the clearance material; the reasonable selection ofvertical anti-fall device gap value and the stiffness.This essay studies the construction of piers in deep water, and provides the basis for seismic design of bridges through the above analysis and comparison.This paper is from the topic " the seismic research of Simao～Lancang highway bridge", which is the technology fund project of Department of Transportation in Yunnan Province (project number:KKK0201006076), meanwhile it has received the project fund.更多还原