【作者】 王蒂；

【导师】 黄平明；

【作者基本信息】 长安大学 ， 桥梁与隧道工程， 2011， 博士

【摘要】 近年来，爆破在公路交通建设领域广泛应用，频繁的爆破作业一方面满足了公路建设项目的要求，得到了巨大的经济效益，但同时也产生了一系列的危害。目前，我国正处于高速建设时期，土地资源越来越宝贵，很多高速公路密集并行架设，新建道路的施工很可能对临近公路设施产生影响，这其中就包含了爆破施工的干扰，虽然爆破施工设计是可以控制的，但由于受爆破条件和爆破波传播介质的复杂性的影响，仍然可能对邻近结构物产生很大的破坏。因此考虑爆破地震波的特性，系统地研究爆破地震波作用下，公路桥梁结构的动力响应，具有十分重要的意义。本文以公路悬索桥为研究对象，针对其爆破振动响应情况进行了系统研究。结合悬索桥的动力特性及动力分析方法等研究现状，从反应谱分析方法出发，同时采用各种时程分析的方法，详细地研究了爆破地震波作用下，悬索桥结构的动力响应规律，本文的主要研究内容有：1.首先从爆破地震波的特性、爆破地震波的输入、动力学研究的阻尼问题、地基与结构的动力相互作用问题、行波效应问题、多点激励问题以及大跨度桥梁的非线性问题等几个方面，探讨了大跨度桥梁爆破地震响应的主要影响因素；分别介绍了桥梁爆破地震反应分析的反应谱方法、桥梁空间非线性地震反应时程分析方法、大跨度桥梁的随机地震响应分析方法，指出了各自的优缺点；2.对悬索桥有限元建模问题进行了详细的分析，合理选择不同有限元单元来模拟结构构件的性能，建立了正确的悬索桥有限元模型，对结构作了动力反应谱分析，在分析中，用振型叠加反应谱法分别研究了振型组合方法（SRSS、CQC）、振型参与系数以及爆破地震动输入的空间组合效应对结构响应的影响；3.采用输入实测爆破地震波时程曲线，探讨了悬索桥结构对一致线性爆破地震的响应情况，并将其结果与反应谱法计算结果进行了比较；利用有限元程序实现了考虑悬索桥几何非线性性能的一致非线性爆破激励时程分析，研究了几何非线性对悬索桥结构爆破地震响应的影响；4.利用Penzien计算模型，考虑了桩—土—结构共同作用，对结构进行了分析计算，并与墩底固结模型作了模态对比分析；考虑行波效应、局部场地效应，采用时程分析法对悬索桥结构在非一致爆破地震激励下的响应进行了分析；5.依托实际工程，研究了临近爆破对大跨径悬索桥锚碇体系的影响，对锚跨索股以及锚锭的动力响应进行了仿真计算，并与实测值进行了对比分析。更多还原

【Abstract】 In recent years, applications of blasting in highway transportation construction spreadwidely. Frequent blasting met the project requirements and obtained enormous economicbenefits, but produced a series of harm at the same time. At present, according to the highspeed construction in China, land resources are becoming more and more valuable. And manyhighway erections, new road construction is likely to effect facilities near the highway, whichincludes the blasting construction disturbance. Although the design of blasting constructioncan be controlled, the blasting and blasting wave propagation through complex medium islikely to destruct adjacent structures. Therefore systematic study of blasting seismic wavecharacteristics, the action of blasting seismic wave, and the dynamic responses of highwaybridge structure, has very important meaning.Taking the highway suspension bridge as the research object, the blasting vibrationresponse is studied. Suspension bridge dynamic property and dynamic analysis method,research status was studied through the response spectrum analysis method and time historyanalysis method, to obtain a detailed action of blasting seismic wave and the dynamicresponse of suspension bridge. The main contents of this paper are as follow:1. Firstly, the blasting seismic wave characteristics, blasting seismic wave input, kineticdamping, soil structure dynamic interaction, traveling wave effect, more incentive problemand nonlinear problems of long span bridges were studied. The main influence factors ofblasting seismic response to long-span bridges are discussed. And the bridge seismic responseanalysis response spectrum method, bridge spatial nonlinear seismic response analysismethod, and the random seismic response analysis method for long span bridges wasintroduced and their advantages, disadvantages were pointed out respectively.2. The suspension bridge finite element modeling problem was undertook in detailedanalysis, through the reasonable selection of different finite element to simulate the structuralcomponent performance and establishment the correct structure finite element model. In thedynamic response spectrum analysis, the superposition method of vibration modeparticipation coefficient and mode combination methods (SRSS, CQC) are studiedrespectively, as well as effect of input dimension to the blasting vibration structural response.3. Inputting the measured blasting seismic waves curve, the suspension bridge structureon the consistent linear blasting seismic response was studied, and the calculation results by response spectrum method were compared. Using considering suspension bridge geometricalnonlinear properties finite element program through uniform excitation blasting nonlineartime-history analysis, the geometric nonlinearity on the blasting seismic response of structurewas studied.4. The Penzien model was used to establish finite element model to consider the pile-soil-structure interaction and compared with the base of pier consolidation model for modalanalysis. Considering traveling wave effect, local site effect, the method of time-historyanalysis was applied to analyze non uniform blasting seismic response of suspension bridgestructure.5. Based on actual engineering, influence of the adjacent blasting on long-spansuspension bridge anchorage system was studied. And the anchor span strand and anchoragedynamic response is calculated and compared with the measured values.更多还原