【摘要】：動(dòng)水效應(yīng)是深水橋梁抗震設(shè)計(jì)中需要考慮的重要問(wèn)題。由于高墩、大跨的結(jié)構(gòu)特點(diǎn),深水橋梁通常具有較長(zhǎng)的自振周期,當(dāng)其鄰近或跨越斷層時(shí),長(zhǎng)周期脈沖型地震動(dòng)作用勢(shì)必對(duì)此類結(jié)構(gòu)帶來(lái)更加嚴(yán)峻的考驗(yàn)。目前,脈沖型近場(chǎng)地震下深水橋梁的抗震研究相當(dāng)薄弱,相關(guān)規(guī)范計(jì)算方法在此類地震下的有效性及適用范圍亟待檢驗(yàn)。 本文在系統(tǒng)總結(jié)國(guó)內(nèi)外代表性規(guī)范的動(dòng)水效應(yīng)計(jì)算方法并分析其不足的基礎(chǔ)上,分別以等效單墩模型和深水連續(xù)梁橋?yàn)閷?duì)象,以典型的脈沖型近場(chǎng)地震動(dòng)為輸入,從自振特性、分布動(dòng)水壓力、動(dòng)水壓力合力及其作用位置、動(dòng)水壓力作用下的結(jié)構(gòu)地震響應(yīng)等指標(biāo)的角度,對(duì)國(guó)內(nèi)外代表性規(guī)范的動(dòng)水效應(yīng)計(jì)算方法進(jìn)行了有效性檢驗(yàn)；并以長(zhǎng)細(xì)比為主要參數(shù)構(gòu)造算例模型組,對(duì)各規(guī)范動(dòng)水效應(yīng)計(jì)算方法的合理適用范圍進(jìn)行了量化討論。本文的主要研究工作如下： 1.系統(tǒng)梳理了國(guó)內(nèi)外代表性規(guī)范的動(dòng)水效應(yīng)計(jì)算方法,對(duì)比并總結(jié)了各規(guī)范在動(dòng)水壓力計(jì)算方面存在的主要問(wèn)題或不足。 2.建立深水橋梁的等效圓截面單墩模型,以考慮流固耦合效應(yīng)的墩—水全數(shù)值計(jì)算結(jié)果為基準(zhǔn),從自振特性、分布動(dòng)水壓力、動(dòng)水壓力合力及其作用位置、動(dòng)水壓力作用下的結(jié)構(gòu)地震響應(yīng)等指標(biāo)的角度,對(duì)各規(guī)范算法在脈沖型近場(chǎng)地震動(dòng)作用下的有效性進(jìn)行了量化檢驗(yàn),對(duì)不同規(guī)范在各類指標(biāo)上的誤差率進(jìn)行了具體評(píng)價(jià)。 3.以某深水連續(xù)梁橋?yàn)閷?duì)象,分別建立考慮流固耦合效應(yīng)的橋梁—水體全數(shù)值計(jì)算模型及半解析—半數(shù)值分析模型,對(duì)各規(guī)范算法在脈沖型近場(chǎng)地震動(dòng)作用下全橋結(jié)構(gòu)計(jì)算的有效性進(jìn)行了量化檢驗(yàn),對(duì)不同規(guī)范在各類指標(biāo)上的誤差率進(jìn)行了具體評(píng)價(jià),并和單墩模型的評(píng)估結(jié)果進(jìn)行了對(duì)比。針對(duì)我國(guó)鐵路規(guī)范在分布動(dòng)水壓力計(jì)算方面存在的不足,對(duì)其可能的改進(jìn)方向進(jìn)行了討論。 4.以長(zhǎng)細(xì)比為主要參數(shù),構(gòu)造兩類算例模型組,分別從結(jié)構(gòu)自振特性、動(dòng)水壓力量值、結(jié)構(gòu)地震響應(yīng)的角度提煉了各項(xiàng)指標(biāo)誤差率的分布特征,量化界定了各規(guī)范的適用范圍。
[Abstract]:Dynamic water effect is an important problem to be considered in seismic design of deep-water bridges. Because of the structural characteristics of high piers and long span, deep-water bridges usually have a long natural vibration period. When they are adjacent to or across faults, the use of long-period pulse seismic action is bound to bring more severe tests to this kind of structure. At present, the seismic research of deep-water bridges under pulse near-field earthquakes is very weak, and the effectiveness and scope of application of the relevant code calculation methods under this kind of earthquakes need to be tested urgently. On the basis of systematically summing up the calculation methods of dynamic water effect of representative codes at home and abroad and analyzing their shortcomings, this paper takes the equivalent single pier model and deep water continuous beam bridge as the object, takes the typical pulse near site vibration as the input, and takes the natural vibration characteristics. From the point of view of distributing dynamic water pressure, dynamic water pressure resultant force and its action position, structural seismic response under dynamic water pressure, the validity of the calculation method of dynamic water effect in representative codes at home and abroad is tested. The model group of numerical examples is constructed with slenderness ratio as the main parameter, and the reasonable applicable range of dynamic water effect calculation methods of each specification is quantitatively discussed. The main research work of this paper is as follows: 1. The calculation methods of dynamic water effect of representative codes at home and abroad are systematically combed, and the main problems or shortcomings of each code in the calculation of dynamic water pressure are compared and summarized. 2. The equivalent circular section single pier model of deep water bridge is established, based on the numerical results of pier and water considering fluid-solid coupling effect, from the natural vibration characteristics, the distribution of dynamic water pressure, the resultant force of dynamic water pressure and its acting position. From the point of view of seismic response of structures under dynamic water pressure, the effectiveness of each specification algorithm under pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely. 3. Taking a deep-water continuous beam bridge as the object, the full numerical calculation model and the semi-analytical-semi-numerical analysis model of the bridge-water body considering the fluid-solid coupling effect are established respectively. The validity of the calculation of the whole bridge structure under the action of pulse near-site vibration is quantitatively tested, and the error rates of different specifications on various indexes are evaluated concretely, and the evaluation results are compared with those of the single pier model. In view of the shortcomings of the railway code in the calculation of distributed dynamic water pressure, the possible improvement direction of the railway code is discussed in this paper. 4. Taking slenderness ratio as the main parameter, two kinds of example model groups are constructed. The distribution characteristics of error rate of each index are extracted from the point of view of structural natural vibration characteristics, dynamic water pressure value and structural seismic response, and the applicable scope of each code is quantitatively defined.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U442.55

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相關(guān)期刊論文 前1條

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本文編號(hào)：2480967