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1、強(qiáng)震區(qū)拱橋縱向地震震動(dòng)分析熊琴普(咸寧市水利勘察設(shè)計(jì)院,咸寧431700)魏利波(西藏自治區(qū)旁多水利樞紐管理局,拉薩850000)摘要:四川汶川大地震災(zāi)難警示我們,強(qiáng)震區(qū)地震災(zāi)害后期應(yīng)急處置中,橋梁的抗震性能研究及震害橋梁快速修復(fù)是公路交通生命線的關(guān)鍵環(huán)節(jié)之一。統(tǒng)計(jì)資料顯示,汶川大地震共造成6140座橋梁受損,如都江堰~汶川高速公路的廟子坪大橋、百花大橋在地震發(fā)生后中部橋板墜落、基礎(chǔ)變形、傾覆,導(dǎo)致進(jìn)入強(qiáng)震區(qū)的公路交通生命線中斷,救災(zāi)部隊(duì)、人員和醫(yī)療、生活物資遲遲不能從陸路進(jìn)入,顯著放大了地震災(zāi)害。拱橋以其經(jīng)濟(jì)、美觀、耐久得到人們的青睞,成為我國(guó)西南山區(qū)最常用
2、的橋型之一。拱橋常常作為公路交通的樞紐,一旦地震使交通線遭到破壞,可能導(dǎo)致的生命財(cái)產(chǎn)及間接經(jīng)濟(jì)損失是巨大的。而拱橋受地震作用主要是縱向方向,因此對(duì)強(qiáng)震區(qū)拱橋縱向震動(dòng)研究,對(duì)指導(dǎo)強(qiáng)震區(qū)拱橋理論研究,具有重要的現(xiàn)實(shí)意義。關(guān)鍵詞:地震;拱橋;地震荷載;縱向震動(dòng);震動(dòng)分析中國(guó)分類號(hào):U442文獻(xiàn)標(biāo)志碼:A文章編號(hào):LongitudinalvibrationanalysisofarchbridgeearthquakeinEarthquakezoneXiongqinpu(XianningWaterReconnaissanceDesignInstitute,Xianning
3、437100,China)Weilibo(PangduohydroManagementBureauofTibet,Lasa850000,China)Abstract:Sichuanwenchuanearthquakedisasterwarningus,strongearthquakedisasteremergencyinthequakezonelateintheseismicbehaviorofthebridge,researchandearthquakedamagefastrepairhighwaybridgeisoneofthekeylinkstransp
4、ortationlifeline.Statisticsshowthat,wenchuanearthquakecaused6140Bridgesweredamaged,dujiangyan~wenchuanhighwaybridge,templeofsonpingflowersbridgeaftertheearthquakeQiaoBancentral,fallingdeformation,overturned,basedinthehighwaytransportationlifelinetoearthquakerelieftroops,personnel,in
5、terruptedandmedical,suppliescan'tfromoverlandinto,significantlyamplifiedtheearthquakedisaster.Archbridgewithitseconomic,beautiful,durablegetthefavourofpeople,becomeourcountrythemountainoussouthwestofoneofthemostcommonlyusedbridge.Archbridgeisoftenusedashighwaytraffichub,oncetheearth
6、quakethattransitdestroyed,maycausethelifeandpropertyandindirectlossishuge.Andbytheearthquakeeffectarchbridgeismainlylongitudinaldirection,sostrongearthquakezoneoflongitudinalvibrationandresearch,archbridgestrongearthquakezonetheorystudyguidearchbridge,haveimportantpracticalsignifica
7、nce.Keywords:Theearthquake;Archbridge;Seismicload;Thelongitudinalvibration;Vibrationanalysis1引言四川汶川大地震災(zāi)難警示我們,強(qiáng)震區(qū)地震災(zāi)害后期應(yīng)急處置中,橋梁的抗[1]震性能研究及震害橋梁快速修復(fù)是公路交通生命線的關(guān)鍵環(huán)節(jié)之一。統(tǒng)計(jì)資料顯示,汶川大地震共造成6140座橋梁受損,如都江堰~汶川高速公路的廟子坪大橋、百花大橋在地震發(fā)生后中部橋板墜落、基礎(chǔ)變形、傾覆,導(dǎo)致進(jìn)入強(qiáng)震區(qū)的公路交通生命線中斷,救災(zāi)部隊(duì)、人員和醫(yī)療、生活物資遲遲不能從陸路進(jìn)入,[2]顯著放大了地震災(zāi)
8、害。拱橋以其經(jīng)濟(jì)、美觀、耐久得到人們的