Technical Analysis On Seismic Reinforcement Of Single Span Frame In Primary And Secondary School Buildings

Single span frame structure has a relatively wide range of applications inPrimary and secondary school buildings, due to the lack of seismic redundancy inthis kind of structures as well as seismic thin line of defense,once the column onone side of were damaged or destruction during the earthquake,may lead to thecontinuous collapse of the structure.After the wenchuan earthquake,"Buildingaseismic appraisal standard"requires frame structure are unfavorable inr single spanfram,and should not be used. The current seismic design code (code for seismicdesign of buildings) requires framework uses single span frame structure isunfavorable.Therefore, primary and secondary school buildings in the earthquakezone of single span frame structure seismic strengthening measures must be taken.This paper took a single span reinforced concrete frame buildings of primaryand secondary schools as an example, through adding buckling resistancebrace(BRB) and concrete frame shear wall for enhancintg redundancy. Analyzed seismicperdormances of the frame building by using the above mentioned methods basedon Sap2000finite element software. Analysis results showed that under severeearthquakes, interlayer displacement Angle of the frame fortified by using shearwall decreases obviously, and its overturning moment is increased. under rareearthquake, the BRB can effectively increase the characteristics of energyconsumption, and decrease interlayer displacement Angle, base shear force.Seismic evaluation based on Pushover performance showed that the twostrengthening methods can change the frame’s failure pattern, improve thedevelopment of plastic hinge components, and make the original structure of thecolumn hinge failure mechanism improvement of structure seismic favorable beamhinge failure mechanism. Technical and economic analysis for two kinds ofstrengthening methods, from the comprehensive assessment of construction periodand construction costs, analysis results showed that the BRB is better than the wallreinforcement on many aspects, such as less wet operation, shorter strengtheningconstruction period, small impacts to the environment and pollution, Single spanframe adopts buckling constraint support reinforcement, seismic comprehensive effect is better.