【摘要】：近幾年來(lái)，國(guó)內(nèi)外地震頻發(fā)，地震損失慘重。我國(guó)的抗震形式亦十分嚴(yán)峻，2008年5月12日發(fā)生的汶川大地震，造成了非常巨大的人員傷亡和經(jīng)濟(jì)損失，舉世震驚。橋梁工程，作為震區(qū)交通線的樞紐工程，其抗震性能關(guān)系到抗震救災(zāi)工作的大局，受到極大關(guān)注。因此國(guó)內(nèi)外工程師和學(xué)者們紛紛對(duì)橋梁的震害進(jìn)行了認(rèn)真系統(tǒng)的調(diào)查研究，并從不同角度提出了不同的抗震理念。鑒于基礎(chǔ)隔震技術(shù)在房屋建筑領(lǐng)域的廣泛運(yùn)用，并取得的良好隔震效果，本文通過(guò)數(shù)值模擬對(duì)基礎(chǔ)滑移隔震技術(shù)運(yùn)用于等高墩連續(xù)剛構(gòu)橋進(jìn)行了技術(shù)研究，分析表明基礎(chǔ)滑移隔震橋梁較非隔震橋梁也能取得良好的隔震效果。因此對(duì)基礎(chǔ)滑移隔震連續(xù)剛構(gòu)橋開(kāi)展其抗震性能的研究具有重要的意義。 本文以等高墩基礎(chǔ)滑移三跨連續(xù)剛構(gòu)橋?yàn)檠芯繉?duì)象，對(duì)其地震響應(yīng)及影響因素進(jìn)行了研究，主要包括以下內(nèi)容： 1.通過(guò)查閱文獻(xiàn)，回顧了隔震技術(shù)的發(fā)展?fàn)顩r、分類(lèi)及其優(yōu)缺點(diǎn)；理論推導(dǎo)了基礎(chǔ)滑移隔震剛構(gòu)橋的運(yùn)動(dòng)方程，力學(xué)模型，以及滑移層的滯回曲線的選用，根據(jù)摩擦滑移的特性，選用剛塑性恢復(fù)力模型。 2.數(shù)值仿真方面，給出了地震波的選擇原則以及滑移層的模擬方式，對(duì)比了基礎(chǔ)滑移隔震橋梁與一般橋梁（基礎(chǔ)固結(jié)）自振特性、地震響應(yīng)的差異。 3.對(duì)基礎(chǔ)滑移隔震橋梁的地震響應(yīng)進(jìn)行了參數(shù)研究，運(yùn)用單一變量的方法，研究了不同摩擦系數(shù)、地震強(qiáng)度、墩高對(duì)地震響應(yīng)的影響，，數(shù)據(jù)表明，基礎(chǔ)隔震橋梁的地震響應(yīng)對(duì)不同參數(shù)的敏感度不同，且呈現(xiàn)不同的規(guī)律性。 4.針對(duì)基礎(chǔ)滑移隔震橋梁存在橫向傾覆的風(fēng)險(xiǎn)，本文推導(dǎo)了橫向抗傾覆的判別條件，并以特定案例給出了橫向抗傾覆計(jì)算的簡(jiǎn)化思路。最后給出了橫向抗傾覆的輔助設(shè)施—柔性錨固。
[Abstract]:In recent years, frequent earthquakes at home and abroad, earthquake losses. The earthquake in Wenchuan occurred on May 12, 2008, which caused tremendous casualties and economic losses, and shocked the whole world. Bridge engineering, as a hub project of seismic area communication line, its seismic performance is related to the overall situation of earthquake relief work, and has received great attention. Therefore, engineers and scholars at home and abroad have made a serious and systematic investigation and study on the earthquake damage of bridges, and put forward different seismic concepts from different angles. In view of the extensive application of foundation isolation technology in the field of building construction and the good isolation effect obtained, this paper makes a technical study on the application of sliding foundation isolation technology to continuous rigid frame bridge with constant height piers through numerical simulation. The analysis shows that the base sliding isolated bridge can also obtain good isolation effect. Therefore, it is of great significance to study the seismic behavior of continuous rigid frame bridge with sliding isolation. In this paper, the seismic response and the influencing factors of the three-span continuous rigid frame bridge with sliding foundation with equal height piers are studied. The main contents are as follows: 1. The development, classification, advantages and disadvantages of isolation technology are reviewed, and the motion equation, mechanical model and hysteretic curve of sliding layer are derived theoretically according to the characteristics of friction slip. Selection of rigid-plastic restoring force model. 2. In the aspect of numerical simulation, the selection principle of seismic wave and the simulation method of sliding layer are given, and the difference of natural vibration characteristics and seismic response between sliding isolated bridge and general bridge (foundation consolidation) is compared. 3. The influence of different friction coefficient, earthquake intensity and pier height on seismic response is studied by using single variable method. The seismic responses of base-isolated bridges have different sensitivity to different parameters and have different regularity. 4. In view of the risk of lateral overturning of sliding base isolated bridges, this paper deduces the discriminant conditions of lateral anti-overturning, and gives a simplified way of calculation of lateral anti-overturning in a special case. Finally, flexible Anchorage is given as the auxiliary device of lateral anti-capsizing.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U448.23;U441.3

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