【作者】 宋飞；

【导师】 黄平明； 王蒂；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2010， 硕士

【摘要】 爆破震动引起的大跨度桥梁地下结构的振动效应是影响桥梁安全的重要因素。悬索桥,由于其跨越能力大、抗震性能好,越来越成为大跨度桥梁的首选桥型。锚碇作为其主要的地下结构,在爆破地震波的作用下,振动效应是最显著的,关系到整个结构体系的安全与否。然而,目前对于悬索桥锚碇体系的爆破振动效应研究很少,因此,论文的选题十分必要。本文首先研究了爆破地震波的形成、衰减规律,分析了爆破地震与天然地震的差异、爆破地震效应的影响因素以及其对邻近建筑物的影响；基于对现有相关规范的分析,指出了现有结构物爆破振动安全评判方法的局限性,提出了较为合理的爆破地震波作用下桥梁结构的安全评估方法。其次,介绍了爆破震动理论的发展,研究了反应谱分析理论和动态时程分析理论两种结构动力响应分析方法的基本原理,并对动态时程分析理论的计算方法作了简单介绍；对索股静动力特性的解析公式进行了推导,分析了各参数对索股受力的影响,为研究锚跨索股在爆破地震波作用下的动力响应提供了理论基础。最后,结合实际工程,分别对爆破地震波作用下大跨径悬索桥锚碇体系的锚跨索股和锚碇进行仿真分析,得出了一些有益的结论,提出了基于本工程的锚碇体系爆破振动安全距离建议值,验证了本文提出的爆破振动安全评估方法的可行性。更多还原

【Abstract】 The underground structure vibration effects of long-span bridge caused by blasting vibration are important factors to affect the safety of bridge. Suspension bridge, because of its strong spanning capacity and high seismic performance, are becoming the first choice in long-span bridges. As its main underground structure, under the action of blasting seismic waves, the blasting vibration effect of the anchor is notable, which relates to the safety of the whole structure. However, there is little research papers for the blasting vibration effect of suspension bridges’anchor system. So, it is necessary for the choose of topic.First, this paper studies the formation of blasting quake waves and the rule of blasting quake wave attenuation, analyzes the difference of the blasting quake and earthquakes, the influencing factors of blasting quake effects and the influence of blasting quake wave on nearby building. Based on the summary of the existing related standard, points out the limitations of the existing structures of blasting vibration safety evaluation method, puts forward a reasonable blasting quake safety assessment method of bridge structure.Secondly, this paper introduced the development of blasting vibration theory, studies two kinds of structure dynamic response analysis method’fundamental principle which incloud the response spectrum analysis theory and the dynamic time-history analysis theory, and simple introduced the calculation methods of dynamic time-history analysis theory. Through deducing the analytical formulas of stay-cables static and dynamic characteristics, this paper analyses the influence of each parameters for cable characteristics, provide a theory basis for research in the dynamic response of anchor span strand under the action of blasting seismic.Finally,combined with an actual project, this paper come to some useful conclusions, through the simulation analysis for the dynamic response of long-span suspension bridges’ anchor system which under the action of blasting seismic waves. And suggest a safe distance of anchor system for blasting vibration which caused on this project, proved the feasibility of safety assessment method about the blasting vibration.更多还原