某开裂楼板加固后荷载试验分析-豆柴文库

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某开裂楼板加固后荷载试验分析
Introduction
Buildingstructuresarecrucialinurbandevelopmentsandaredesignedtowithstandtheloadsandstressesexertedonthem.Buildingsareexpectedtobesafe,stable,andabletowithstandenvironmentalforcesandhumanactivities.However,duetochangesinusage,age,andmaintenance,structuralproblemssuchascrackingandexcessivedeflectioncanoccur,whichmaycompromisethebuilding'sintegrity.Therefore,inthispaper,wewilldiscusstheanalyticalresultsofaloadtestonareinforcedfloorslabthathadcracked.
Background
Theslabinquestionwasalevelslabandwasexperiencingexcessivedeflection,inducingsevereverticalcracks.Visualinspectionandpreliminarymeasurementssuggestedthatthecausewasinsufficientconcreteslabthickness,whichledtooverloading.Therefore,aseriesofloadtestingwasundertakentoevaluatethestrength,stiffness,anddurabilityoftheslabandtoidentifyanypotentialremedialworks.Theloadtestwascarriedoutusingastandardtestproceduretosimulatedifferentloadingconditionsandmeasurethedeflection,strain,andload.
TestProcedure
Todeterminetheloadingcapacityoftheslab,astep-by-stepprogressiveloadingtestwascarriedout.Theloadwasappliedinincrementsof1.5kN/m²usingahydraulicjackandmeasuredusingaloadcell.Thereadingswererecordedatintervalsof2minutesforatotalof10minutesforeachloadincrement.Aftereachloadincrement,thedeflectionwasmeasuredusingadigitallevelgauge.Theloadwasapplieduntilthedesiredloadwasachieved,orthedeflectionexceededtheacceptedlimit.
ResultsandAnalysis
Theinitialdeflectionunderself-weightwasmeasured,anditwasfoundthatexcessivedeflectionwasobserved,whichwasbeyondtheacceptablelimit.Theinitialdeflectionwas12.5mm,whichwashigherthantheallowablelimitof10mm.Thefirstloadof1.5kN/m²wasapplied,andthedeflectionincreasedto13.5mm,whichwasstillhigherthanthepermissiblelimit.Astheloadwasincreased,thedeflectionalsoincreased,andat20kN/m²,thedeflectionwas98mm,whichwasbeyondtheacceptablelimitandwasconsideredafailurepoint.
Thestrainandloaddatawereanalyzedtodeterminethestrength,stiffness,andductilityoftheslab.Figure1showstheload-deflectioncur