發(fā)布時(shí)間：2018-01-13 03:34

  本文關(guān)鍵詞：地震動(dòng)隨機(jī)功率譜模型分析改進(jìn)及其參數(shù)值確定　出處：《長安大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 地震動(dòng) 功率譜 隨機(jī)振動(dòng) 功率譜模型改進(jìn) 參數(shù)確定

【摘要】：在地震工程學(xué)領(lǐng)域中，地震動(dòng)功率譜起著非常重要的作用。地震動(dòng)功率譜模型是用來描述地震地面運(yùn)動(dòng)過程能量的頻域分布規(guī)律，是地震動(dòng)隨機(jī)模型的重要組成部分。如果具有充足的地面運(yùn)動(dòng)資料，那么就可直接用統(tǒng)計(jì)分析來建立地震動(dòng)隨機(jī)模型。然而，到目前為止，強(qiáng)地面運(yùn)動(dòng)的加速度記錄資料仍然非常有限，因此，不得不假設(shè)模型的形式。在地震工程領(lǐng)域中，雖然有一些學(xué)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(duì)地震動(dòng)功率譜模型進(jìn)行深入研究。 首先，本文對(duì)地震動(dòng)功率譜模型的研究現(xiàn)狀進(jìn)行了梳理，總結(jié)了多種地震動(dòng)功率譜模型，根據(jù)地震動(dòng)模型的評(píng)價(jià)標(biāo)準(zhǔn)對(duì)目前已有功率譜模型進(jìn)行了對(duì)比分析。 其次，針對(duì)彭凌云模型在高低頻抑制強(qiáng)度方面的不足之處，本文提出了新的修正彭凌云模型，推導(dǎo)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?qū)Ρ疚奶岢龅男拚砹柙颇Ｐ秃团砹柙颇Ｐ蛷娜齻�(gè)方面進(jìn)行對(duì)比分析，以此驗(yàn)證本文提出的修正彭凌云模型的優(yōu)勢(shì)。 最后，收集了Ⅱ類場(chǎng)地條件下的100條實(shí)際記錄地震波，，根據(jù)8度多遇地震對(duì)所有地震波的原始信號(hào)進(jìn)行調(diào)整，對(duì)調(diào)整后的各條地震波做傅里葉變換，獲得頻譜圖，進(jìn)行頻譜分析。同時(shí)，采用Matlab軟件編制程序，利用最小二乘法對(duì)平均功率譜曲線進(jìn)行擬合，進(jìn)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(jié)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(zhǔn)確反映地震動(dòng)的實(shí)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(hào)：1417311