本文關(guān)鍵詞： 橋梁工程 阻尼比 激勵(lì)模式 半功率帶寬法 自由衰減法　出處：《振動與沖擊》2016年03期 　論文類型：期刊論文

【摘要】：收集和分析了國內(nèi)外學(xué)者對結(jié)構(gòu)物阻尼比的實(shí)測結(jié)果,指出了當(dāng)前橋梁阻尼比研究成果的局限性。為了彌補(bǔ)當(dāng)前橋梁阻尼比實(shí)測結(jié)果匱乏的局限,針對三座典型橋梁進(jìn)行了阻尼比測試,分析了影響橋梁阻尼比的主要因素。該研究發(fā)現(xiàn):橋梁的阻尼比不是定值,它與橋梁的類型、測試時(shí)的激勵(lì)方式、阻尼比的處理方法、測試環(huán)境等有較大的相關(guān)性。激勵(lì)強(qiáng)度越大,測試的阻尼比數(shù)值越大。車輛激勵(lì)作用下的阻尼比數(shù)值明顯大于環(huán)境激勵(lì)下的阻尼比數(shù)值。相同激勵(lì)模式下,不同的阻尼比處理方法所計(jì)算的阻尼比數(shù)值差距較大。半功率帶寬法計(jì)算的阻尼比數(shù)值的離散性要大于利用自由衰減法計(jì)算的阻尼比。建議橋梁結(jié)構(gòu)阻尼比的測試中需要保證激勵(lì)的一致性,避免在采樣過程中出現(xiàn)激勵(lì)程度差距較大的激勵(lì)模式。
[Abstract]:This paper collects and analyzes the measured results of the damping ratio of structures at home and abroad, and points out the limitations of the current research results on the damping ratio of bridges, in order to make up for the lack of the measured results of the current bridge damping ratios. The damping ratio of three typical bridges is tested and the main factors influencing the damping ratio are analyzed. It is found that the damping ratio of the bridge is not a fixed value, the type of the bridge and the type of the bridge, and the excitation mode of the test. The damping ratio of the treatment method, testing environment and so on has a greater correlation. The greater the intensity of excitation. The larger the damping ratio is, the bigger the damping ratio is under the excitation of the vehicle, which is obviously higher than the value of the damping ratio under the environmental excitation. The difference of damping ratio calculated by different damping ratio processing methods is large. The dispersion of damping ratio calculated by half-power bandwidth method is greater than that calculated by free attenuation method. It is suggested that the damping ratio of bridge structure should be measured. It is necessary to ensure the consistency of motivation in the test. Avoid the incentive mode in the sampling process where the incentive degree gap is large.
【作者單位】： 交通運(yùn)輸部公路科學(xué)研究院;
【分類號】：U446
【正文快照】： 阻尼作為在橋梁結(jié)構(gòu)動力響應(yīng)計(jì)算中一個(gè)重要因素,其取值的大小直接影響著動力響應(yīng)的計(jì)算結(jié)果,但是其機(jī)理、模型、取值等方面的研究仍然落后與其他研究,嚴(yán)重制約著結(jié)構(gòu)動力學(xué)的發(fā)展[1]。Leger等[2]利用8種不同的阻尼模型對結(jié)構(gòu)進(jìn)行了地震時(shí)程分析,不同模型計(jì)算的延性系數(shù)、耗散

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