Finite Element Analysis Of Seismic Retrofitting On Multi-storey Masonry School Buildings

Masonry structure has a long history in our country.Due to its easily to get materials and low cost, for the past few years, masonry structure is major structure forms in primary and middle school buildings of china.In recent years,several destructive earthquakes stroked our country and caused sevre damages of many primary and middle school buildings, from the damage situation, compared to other structure forms, the casualties and economic loss of masonry structure is particularly prominent. Especially after the "Wenchuan Earthquake", the seismic behavior of masonry school building arouse the great attention of the scholars both at home and abroad.Meanwhile the work of safty inspection、seismic evaluation and anti-seismic reinforcement on primary and middle school buildings was carried out in nationwide.So it is very necessary to do some thorough research on seismic capacity of masonry school building before and after reinforcement.Based on the domestic and foreign scholars’research achievements on masonry structure of finite element analysis by ANSYS, the article discusses the damage proeess of the school buildings under earthquake through transient seismic analysis.Summarizes of the numerical simulation results are as follows:1.Selected a masonry school building in Xiaoshan district, hangzhou city as an example, a FE model of a masonry school structure was established with masonry material constitution in linear kinematic hardening model (MKIN) and masonry damage criterion in CONCRETE model of ANSYS,and simulate the damage features of the masonry building structure under the action of earthquake. Results comparison of the masonry building structure’s seismic capacity between the finite element numerical simulation and calculation according to standard show the feasible of the FE A method.2. Followed is finite element simulation of the masonry wall’s anti-side force behavior under pressure, the numerical simulation results shows that the chemieally plated bar in aseismatic masonry structure can be used to keep concrete column from separating out of the wall, and it has no effect on increasing the stiffness of the masonry wall. The change of weightless seismic capacity was obtained by comparing the results of the masonry building structure and the construction concrete columns reinforced structure through transient seismic analysis.3.The nominal material parameters of cavity wall masonry was obtained by fitting the force-displacement curve of the experiment results which according to the literature and finite element simulation. The seismic capacity of the cavity masonry building structure and the steel bars net reinforced cavity masonry structure was compared by using the nominal material parameters.