Performance-based Seismic Hardening And Optimization Study Of Existing Masonry Structure

There are many existing masonry structure in our country. This structure’s material haslow-intensity and poor ductility. Substandard design, nonstandard construction, aging andhigher performance requirement make the safety of the existing masonry structure can’t beguaranteed. The expensive cost of rebuilding, the huge impact to the normal living order andenvironment which the remove generates and the developments of method in the seismicperformance design make the performance-based seismic hardening study of existingmasonry structure necessary.The article discusses the architecture’s seismic performance design, seismic time-historyanalysis, structural strengthening and strength optimum of the existing masonry structuredeeply, which supply reliable technical literature to the practical application in engineeringand the revise of the related criterion. There are several following aspects:1、Summarize some issues in the detection, evaluation and strengthening of the existingmasonry structure necessary, analyse the shortage and contradiction of the existingmasonry structure’s detection, evaluation and strengthening in current specificationand software for calculation, and propose the homologous solution.2、In line with the earthquake level of new structure, put forward the earthquake level ofthe structure whose continuous seismic working life is30or40years in frequentearthquake, anti-seismic fortification earthquake and rare earthquake; Consider thefactors which affect anti-seismic capability level of building, such as structureimportance, social impact, casualties, structural damage, in-house facility damage,direct economic loss, indirect economic loss, etc. And grade every factor, quantizethe anti-seismic capability level; Serialize the structural performance objective, andput forward the relation between capability level value and story drift angles’limitingvalue.3、On the basis of the site condition and structure condition, screen strong shock’srecorded wave and artificial fitting wave, Tianjin seismic waves, Qian’an seismicwaves and artificial seismic wave can agree with physical condition better. In linewith local earthquake level, adjust peak acceleration of Tianjin seismic waves, Qian’an seismic waves and artificial seismic wave in frequent earthquake,anti-seismic fortification earthquake and rare earthquake; Analyse effective duration,and get proper seismic wave time-histories acceleration.4、Simplify practical engineering and establish finite element model, carry dynamic andtime-historical analysis to structure1and structure2with worked Tianjin seismicwaves, Qian’an seismic waves and artificial seismic wave, read correspondentmaximum displacement of3panel points at structure’s every layer, take averaging ascentral value which reflects this floor’s displacement, and compare the maximum ofstory drift angles with performance objective. The result shows that anti-seismicperformance requirement are dissatisfied in structure1and structure2, which shouldbe strengthened.5、In line with local conditions, take comparison and selection to the strengtheningmethod of structure1and structure2, optimize the location and thickness of surfacecourse which uses masonry strengthening with mortar splint, analyse thestrengthening result and evaluate strengthening effect.