本文關鍵詞：地震動隨機功率譜模型分析改進及其參數(shù)值確定　出處：《長安大學》2013年碩士論文　論文類型：學位論文

  更多相關文章： 地震動 功率譜 隨機振動 功率譜模型改進 參數(shù)確定

【摘要】：在地震工程學領域中，地震動功率譜起著非常重要的作用。地震動功率譜模型是用來描述地震地面運動過程能量的頻域分布規(guī)律，是地震動隨機模型的重要組成部分。如果具有充足的地面運動資料，那么就可直接用統(tǒng)計分析來建立地震動隨機模型。然而，到目前為止，強地面運動的加速度記錄資料仍然非常有限，因此，不得不假設模型的形式。在地震工程領域中，雖然有一些學者提出各種模型，但這些模型都存在一些不足之處，故有必要對地震動功率譜模型進行深入研究。 首先，本文對地震動功率譜模型的研究現(xiàn)狀進行了梳理，總結了多種地震動功率譜模型，根據(jù)地震動模型的評價標準對目前已有功率譜模型進行了對比分析。 其次，針對彭凌云模型在高低頻抑制強度方面的不足之處，本文提出了新的修正彭凌云模型，推導了新模型在單自由度體系下的方差公式。并利用Matlab軟件編制程序對本文提出的修正彭凌云模型和彭凌云模型從三個方面進行對比分析，以此驗證本文提出的修正彭凌云模型的優(yōu)勢。 最后，收集了Ⅱ類場地條件下的100條實際記錄地震波，，根據(jù)8度多遇地震對所有地震波的原始信號進行調整，對調整后的各條地震波做傅里葉變換，獲得頻譜圖，進行頻譜分析。同時，采用Matlab軟件編制程序，利用最小二乘法對平均功率譜曲線進行擬合，進而確定本文提出的修正彭凌云模型的參數(shù)值。算例分析結果表明：本文提出的修正彭凌云模型更能合理地描述地面加速度過程，準確反映地震動的實際情況。
[Abstract]:In the field of seismic engineering, seismic power spectrum plays a very important role. The ground motion power spectrum model is used to describe the frequency domain distribution of earthquake ground motion energy. It is an important part of the stochastic model of ground motion. If there is sufficient ground motion data, the stochastic model of ground motion can be established directly by statistical analysis. However, so far. The acceleration records of strong ground motion are still very limited, so we have to assume the form of the model. In the field of seismic engineering, although some scholars have proposed various models. However, there are some shortcomings in these models, so it is necessary to deeply study the power spectrum model of ground motion. Firstly, the research status of the power spectrum model of ground motion is reviewed, and a variety of power spectrum models of ground motion are summarized. According to the evaluation criteria of the ground motion model, the existing power spectrum models are compared and analyzed. Secondly, aiming at the deficiency of Peng Lingyun model in high and low frequency suppression intensity, a new modified Peng Lingyun model is proposed in this paper. The variance formula of the new model under the system of single degree of freedom is derived, and the modified Peng Lingyun model and the Peng Lingyun model proposed in this paper are compared and analyzed from three aspects by using the Matlab software programming program. The advantages of the modified Peng Lingyun model proposed in this paper are verified. Finally, 100 actual recorded seismic waves are collected under the condition of type 鈪

本文編號：1417311