Study On Seismic Response Of Irregular-plan Reinforced Masonry Structures Considering Multi-seismic Resisting Method Under Main And Post Earthquake

Reinforced masonry structures has many advantages such as materials can be easilyobtained, cheap expenses, light weight, high strength, speed of construction, saving mortar,increasing use area and so on. They have taken up the more and more important positions,due to their unique superiority in building structures. At the same time, in order to adapt tothe development of urban construction and demand, the complex shape buildings hasbecome the mainstream and trend of the architectural development, among them large scaleapplication of irregular-plan structures is especially remarkable. Then, as the occurrences ofearthquake is not a single main shock, most of them with frequent aftershocks. The cases ofthe loss caused by the aftershocks were many, so the aftershocks could not be ignored.Finally, our code for seismic design of buildings has indicated that it is better to consider “amulti-seismic resisting line”, but there are no specific relevant provisions. In order to achievethe three level security goals, it is necessary to consider the multi-seismic resisting method,and more researches would be done with it. Therefore, from the three aspects, irregular-planstructures, the main-earthquake and post-earthquake and the multi-seismic resisting method,the reinforced masonry structure will designed, and through the shaking table test, itsresisted seismic performance will be researched. The main contents are as follows:First, in the theory aspect the similarity relation theory will be mainly researched, what’smore, according to the test’s characteristics, the test model similar relationship will bededuced. The model similar proportion is1:4, and other physical coefficients will bedecided.Second, the test model is designed, including structures’ irregularity and the resistingseismic design using the multi-seismic resisting method. The structure walls are divided intothe primary and the secondary lateral load resisting systems. Using the similar relationship,the model’s every parts will be changed, and select the additional artificial qualities and themodel steels.Then, during the experience, the wolong waves which were selected in wenchuanearthquake are chosen as input earthquakes. And considering the effect of main-earthquakeand post-earthquake: loading two same waveforms but different peak acceleration waveswhich simulated the main seismic waves and the main-earthquake and post-earthquake.According to the purposes that greatly satisfy the test purpose the loading method could beensured. Then using the principle of arrangement equipments the test equipments aredecorated to obtain the reaction of displacement, acceleration, and strain response in the earthquakes.Finally, during the test data process the original signal data are processed preliminarywith the MATLAB language programs, including modal analysis, eliminating the tendencyitems and filtering and acceleration secondary integral, to get the smooth c signal resultswithout the noise. Further treatments are done with the results of data to get dynamicproperties of model structure, acceleration responses, displacement responses, the torsionresponse caused by irregular plane and the corresponding results considering themulti-seismic resisting method, and the more studies and analysis will be done to obtaincorresponding conclusions.