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1、學(xué)兔兔www.xuetutu.com土木建筑與環(huán)境工程Vo1.33No.4第33卷第4期JournalofCivil.Architectural&EnvironmentalEngineeringAug.2O112011年8月小跨高比混凝土筒支箱梁靜力性能試驗(yàn)研究陳朝暉h,黃景華h,李觀宇,馬東升。(1.重慶大學(xué),d.土木工程學(xué)院;b.山地城鎮(zhèn)建設(shè)與新技術(shù)教育部重點(diǎn)實(shí)驗(yàn)室,重慶400045;2.云南省電力設(shè)計(jì)院,昆明650051;3.華北電力設(shè)計(jì)院工程有限公司,北京100120)摘要:山地城市排水干管埋地箱涵由于滑坡導(dǎo)致地基塌陷而成為簡(jiǎn)支箱涵,支承方式的改變導(dǎo)致管道
2、結(jié)構(gòu)存在破壞風(fēng)險(xiǎn)。為此,文章對(duì).間ea-支下小跨高比埋地箱梁進(jìn)行了模型靜力加載試驗(yàn),分析了小跨高比埋地箱涵在簡(jiǎn)支條件下的破壞形式、抗剪性能以及剪力滯效應(yīng),討論了現(xiàn)行有關(guān)設(shè)計(jì)規(guī)范對(duì)于箱涵抗剪承載力計(jì)算之不足。研究表明,豎向均布荷載作用下,小跨高比箱梁裂縫分布比較均勻,破壞時(shí)沒有明顯的臨界斜裂縫,最終由于混凝土斜向受壓柱壓潰而喪失承載力。箍筋作為主要的抗剪部件,在斜裂縫出現(xiàn)后承擔(dān)著大部分剪力??v筋應(yīng)變受內(nèi)力重分布和裂縫發(fā)展等因素影響,部分區(qū)域呈現(xiàn)剪力滯效應(yīng)。埋地箱涵由于滑坡地基塌陷導(dǎo)致的支承條件的改變將導(dǎo)致混凝土過早開裂,影響排水管道正常使用。關(guān)鍵詞:鋼筋混凝土;簡(jiǎn)支
3、箱梁;抗剪性能;小跨高比;剪力滯;平截面假定中圖分類號(hào):TU312文獻(xiàn)標(biāo)志碼:A文章編號(hào):16744764(2011)04—001307ExperimentalAnalysisonStaticBehaviorsofSimple—supportedReinforcedConcreteBoxGirderwithSmallDepth-_to‘‘spanRatioCHENZhao.hui。,,HUANGJing-hua。,,LIGuan一,MADong-sheng。(1a.SchoolofCivilEngineering;lb.KeyLaboratoryofNewTech
4、nologyforConstructionofCitiesinMountainArea,MinistryofEducation,Chongqing400045,P.R.China;2.YunnanElectricPowerDesignInstitute,Kunming650011,P.R.China;3.NorthChinaPowerEngineeringCO.,LTD,Beijing100120,P.R.China;)Abstract:Theburiedboxgirdersinthemountaincitysewagepipelinesystemwouldbet
5、urnedintosimple—supportedgirdersbecauseoftheremovalofthefoundationcausedbylandslide.Thischangeofsupportingwouldresuitinthefailureriskofpipelinestructure.Thestaticpropertiesoftheburiedboxgirderswithsmalldepth—tospanratioinsimplesupportedconditionareexperimentallyanalyzed.Thefailurepatt
6、ern,shearbehaviorandshearlageffectoftheburiedboxgirdersinsimple—supportedconditionarestudied.Theshortagesinthepresentdesigncodesforthecalculationofshearcapacitiesoftheboxgirdersarealsodiscussed.Itisshownthatundertheverticaluniformlydistributedload,thecrackdistributionoftheboxgirdersis
7、uniform。andnomajorcriticaldiagonalcrackisformed,andtheboxgirderslosethebearingcapacityintheformofconcretediagonalrodcrushing.Asthemainshearbearingcomponents,thestirrupsdevotemuchtoshearcapacityoftheboxgirderafterconcretecracking.Thestrainsofthelongitudinalrebarsarea{fectedbythosefacto
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