本文關(guān)鍵詞： 橋梁工程 滯回性能 擬靜力試驗 群樁基礎(chǔ) 承臺提離　出處：《中國公路學(xué)報》2017年10期 　論文類型：期刊論文

【摘要】：為了研究可提離式群樁基礎(chǔ)橋梁的抗震性能,設(shè)計和制作了大比例尺的可提離式群樁基礎(chǔ)和普通群樁基礎(chǔ)單墩橋梁試驗?zāi)Ｐ�。試驗�(zāi)Ｐ筒捎眉?xì)砂土箱模擬樁周土體的約束作用,并對可提離節(jié)點進(jìn)行改進(jìn)設(shè)計,以防止局部破壞。采用位移控制分級往復(fù)加載,進(jìn)行擬靜力試驗研究,對比2種不同基礎(chǔ)橋梁的基本抗震性能。試驗結(jié)果表明:可提離式樁的樁身損傷要遠(yuǎn)小于普通樁,改進(jìn)后的可提離樁的節(jié)點未見明顯損傷;可提離式群樁基礎(chǔ)單墩橋梁模型的滯回曲線呈明顯的旗幟形,表明結(jié)構(gòu)主要為非線性彈性變形,而普通樁基礎(chǔ)橋梁模型的滯回曲線為典型的梭形,表明結(jié)構(gòu)主要為塑性變形;可提離式群樁基礎(chǔ)發(fā)生提離后,承臺位移由平動為主轉(zhuǎn)為以轉(zhuǎn)動為主,表明提離式基礎(chǔ)主要依賴承臺以上結(jié)構(gòu)的整體轉(zhuǎn)動來適應(yīng)水平地震作用,進(jìn)而減小基礎(chǔ)的受力和損傷;可提離式樁基礎(chǔ)橋梁的殘余位移僅為相應(yīng)普通樁工況的10%,表明其具有較好的自復(fù)位性能;基于割線剛度的剛度退化指標(biāo)不適宜評估自恢復(fù)結(jié)構(gòu)的剛度退化,建議采用重新加載至正常使用極限狀態(tài)下的最不利荷載組合時的剛度指標(biāo)。
[Abstract]:In order to study the seismic performance of removable pile group foundation bridge. The test model of a large scale removable pile group foundation and a single pier bridge with ordinary pile group foundation is designed and fabricated. The fine sand box is used to simulate the restraint effect of soil around the pile. The design of detachable joint is improved to prevent local damage. Displacement control is used to control the step reciprocating loading and the pseudostatic test is carried out. The experimental results show that the damage of pile body of removable pile is much smaller than that of ordinary pile, and no obvious damage to the joint of the improved pile can be found. The hysteretic curve of the single pier bridge model of removable pile group foundation is obviously flag-shaped, which indicates that the structure is mainly nonlinear elastic deformation, while the hysteretic curve of the ordinary pile foundation bridge model is typical shuttle shape. It shows that the structure is mainly plastic deformation. After lifting the pile group foundation, the displacement of the pile cap is changed from translational to rotational, which indicates that the lifting foundation mainly depends on the whole rotation of the structure above the cap to adapt to the horizontal earthquake action. And then reduce the stress and damage of the foundation; The residual displacement of the removable pile foundation bridge is only 10 parts of the corresponding normal pile condition, which indicates that the bridge has good self-reset performance. The stiffness degradation index based on Secant stiffness is not suitable to evaluate the stiffness degradation of self-restoring structures.
【作者單位】： 同濟(jì)大學(xué)橋梁工程系;
【基金】：國家自然科學(xué)基金項目(51378384) 國家重點基礎(chǔ)研究發(fā)展計劃(“九七三”計劃)項目(2013CB036302)
【分類號】：U443.15;U446.1
【正文快照】： 0引言“5·12”汶川地震以后,中國對橋梁抗震規(guī)范進(jìn)行了系統(tǒng)修訂[1-3],通過引入能力保護(hù)的思想完善了延性抗震體系設(shè)計。提高了基礎(chǔ)的設(shè)防要求,對基礎(chǔ)部分要求按能力保護(hù)原則進(jìn)行設(shè)計,以降低其發(fā)生地震破壞的風(fēng)險。群樁基礎(chǔ)具有豎向承載力大、施工方便、場地適應(yīng)性好等特點,在

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