本文選題：高墩橋　切入點：質(zhì)量參與系數(shù)　出處：《昆明理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來隨著西部大開發(fā)戰(zhàn)略的實施,國家投入了大量資金和精力用于西部公共交通設(shè)施的建設(shè)。西部地區(qū)由于地形、地貌條件復(fù)雜,且多為山地、丘陵。高墩橋梁較其他地區(qū)比重大,其中一些高墩橋梁結(jié)構(gòu)較復(fù)雜,已超出現(xiàn)有橋梁設(shè)計規(guī)范的適用范圍。國內(nèi)外學(xué)者針對高墩橋的特點也進(jìn)行了大量研究,并提出了大量切實可行的計算分析,其中廣泛得到認(rèn)可的IDA(增量時程分析)法可以很好的滿足高墩橋梁結(jié)構(gòu)設(shè)計需求,但卻有耗費時間長、操作困難等缺點,且對于大多橋梁也沒有必要進(jìn)行如此精細(xì)化的分析工作。這就使得對高墩橋梁提出合適的劃分標(biāo)準(zhǔn)變的很有必要。據(jù)此從彈性和彈塑性兩個階段展開分析工作,以期可以得到有效,且對工程實際有一定參考價值的理論。具體包含如下幾個方面。首先,本文分析了高墩橋梁區(qū)別于非高墩橋梁的關(guān)鍵因素：高階振型對結(jié)構(gòu)地震響應(yīng)的貢獻(xiàn),即如何有效地表征各階振型的參與情況成為區(qū)分高墩橋與中、低墩橋梁的關(guān)鍵。據(jù)此,從結(jié)構(gòu)的兩種不同工作狀態(tài)展開分析工作：彈性階段、彈塑性階段。彈性階段,首先比較了多種可以有效衡量振型參與情況的多種指標(biāo),并最終選取質(zhì)量參與系數(shù)作為建立判別標(biāo)準(zhǔn)的指標(biāo)。并從理論上對質(zhì)量參與系數(shù)的各種影響因素進(jìn)行了分析,確定了分析模型建立的各種物理參數(shù)。進(jìn)而展開分析工作,對質(zhì)量參與系數(shù)的各種影響因素展開參數(shù)分析,并最終得到一階模態(tài)及二階模態(tài)質(zhì)量參與系數(shù)的計算公式,可以使得工程技術(shù)人員可以很快的評估各階振型的參與程度。同時,考慮到質(zhì)量參與系數(shù)本身假設(shè)條件的局限性(等反應(yīng)譜值只反映墩底剪力的各階貢獻(xiàn)),采用反應(yīng)譜方法對上述的劃分標(biāo)準(zhǔn)進(jìn)行校對。彈塑性階段,首先對國內(nèi)外規(guī)范的計算方法進(jìn)行分析(基于一階振型占主導(dǎo)地位的公式計算法和Pushover方法來確定),本文采用IDA方法與以一階模態(tài)為加載方式的Pushover方法進(jìn)行對比分析。進(jìn)而對彈性階段提出的判定標(biāo)準(zhǔn)進(jìn)行有效的驗證及修訂。
[Abstract]:In recent years, with the implementation of the strategy of developing the western region, the state has invested a lot of funds and energy in the construction of public transport facilities in the west. The structure of some high-pier bridges is more complex than that of other regions, which has exceeded the applicable scope of the existing bridge design code. Many scholars at home and abroad have also carried out a lot of research on the characteristics of high-pier bridges. A large number of practical calculation and analysis are put forward, in which IDA (incremental time history analysis) method, which is widely accepted, can meet the design requirements of bridge structure with high piers well, but it has many shortcomings, such as time-consuming and difficult to operate. And for most bridges, it is not necessary to carry out such fine analysis work, which makes it necessary to put forward appropriate dividing standards for high-pier bridges. Based on this, the analysis work is carried out from the two stages of elasticity and elastic-plasticity. In order to get the effective theory, and has certain reference value to the engineering practice. The concrete includes the following several aspects. First of all, In this paper, the key factors that distinguish high-pier bridge from non-high-pier bridge are analyzed: the contribution of high-order modes to structural seismic response, that is, how to effectively characterize the participation of various modes of vibration is the key to distinguish high-pier bridge from medium-low pier bridge. From two different working states of the structure, the analysis is carried out: elastic stage, elastic-plastic stage and elastic stage. First of all, a variety of indexes which can effectively measure the participation of vibration modes are compared. Finally, the quality participation coefficient is selected as the index to establish the criterion, and the influence factors of the quality participation coefficient are analyzed theoretically, the physical parameters of the analysis model are determined, and the analysis work is carried out. The parameter analysis is carried out on the various influencing factors of the mass participation coefficient, and the calculation formulas of the first and second order modal mass participation coefficients are obtained, which enables engineers and technicians to evaluate the participation degree of the various modes quickly. At the same time, Considering the limitation of the hypothetical condition of the mass participation coefficient itself (that the equal response spectrum value only reflects the contribution of each order of the shear force at the pier bottom, the response spectrum method is used to calibrate the above classification criteria in the elastic-plastic stage, First of all, the calculation methods of domestic and foreign norms are analyzed (based on the formula calculation method and Pushover method, which are dominant in the first order mode). In this paper, the IDA method is compared with the Pushover method which uses the first order mode as the loading mode. Then the criterion proposed in the elastic stage is validated and revised effectively.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U442

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本文編號：1633420