【作者】 郑海明；

【导师】 李力；

【作者基本信息】 西南交通大学 ， 结构工程， 2013， 硕士

【摘要】 地震是一种破坏力十分强大的自然灾害,地震发生时会对在其影响范围内的建筑结构和设备、设施造成严重损伤和破坏。由于地震本身存在很大的不确定性,影响地震动特征的因素又十分复杂,这就造成了结构在不同地震动作用下的动力响应和损伤程度表现出明显差异。本文主要探讨震源距离对地震动特征的影响,以及不同震源距离下地震动对一个六层框架结构作用效果的差异。本文根据近场和远场地震动的定义分别各选取了11个单方向地震动记录,对原始加速度记录进行了基线校正等前期处理,计算了地震动的速度时程和反应谱等数据,对比分析了两类地震动自身特征的差异；本文建立了一个六层平面框架的非线性动力分析模型,在Perform-3d程序中采用纤维截面模拟其构件非线性行为；最后本文使用所选的地震动对结构进行了增量动力(IDA)分析,对比了近场和远场地震动下结构动力响应特点的差异,分析了导致差异的可能原因。本文通过对比所选的两类地震动,发现了近场地震动大多具有较明显的脉冲特性,且与远场地震动比其加速度反应谱峰值段较长,下降段也相对更平缓,这可能导致结构受到更大的地震作用；通过对比两类地震动下六层框架结构的动力响应,发现了在地震动强度相同时,近场地震动会给该结构带来更大位移反应和相对较小的内力反应,在具有较强脉冲特征的地震动作用下,该结构会表现得更容易屈服和更快达到极限状态。更多还原

【Abstract】 Earthquake is a kind of natural disasters with strong destructive power, when an earthquake occurs, it will cause serious damage and even destruction on the building structure and facilities in it’s scope of the impact. The earthquake itself exists great uncertainty, and the factors to influence the characteristics of earthquake ground motion is very complicated, it causes that, the dynamic response and damage degree of a structure under the effect of different ground motions shows a great difference. This paper mainly discusses the influence of earthquake epicenter distance to the characteristics of earthquake ground motion, and the difference of structure dynamic response under the ground motion with different epicenter distance.Main work include:Choosing11single direction ground motion records according to the definition of near field and far field earthquake respectively, do some preliminary processing to the original acceleration records such as baseline correction, calculating the velocity and response spectrum of the ground motion, comparing the difference between the characteristics of two kinds of ground motion; Building up a nonlinear dynamic analysis model of a plane frame of6, simulating the nonlinear behavior of components with fiber cross section in the Perform-3d application; Using the selected ground motion records for incremental dynamic analysis (IDA) of the structure, statistical processing the calculation results, comparing the structure dynamic response under the ground motion of near field and far field for their difference, then analysis the possible cause of the difference.By comparing the selected two classes of ground motion, we found that the near field earthquake have obvious pulse characteristics, and compared with far field earthquake, it has a longer period of acceleration response spectrum peak, the decline is relatively flat, his can cause bigger seismic action on structure; By comparing the structure dynamic response under the two kinds of ground motions, we found that, with the same ground motion intensity, near field earthquake will cause bigger displacement response and but smaller internal force response, under the ground motion effect with stronger pulse characteristics, Structure will behave to be easier to yield and faster to limit state.更多还原