Optimization And System Establishment Of A Vulnerability Analysis Method For Group Buildings

The masonry buildings and the concrete frame buildings are two main structural types of existing buildings in China currently,and hence how to quickly estimate damage of these buildings after the earthquake has been a research hotspot.In 1988,Nie et al proposed a analogue prediction method for seismic damage(APMSD)of buildings.By using the existing vulnerability analysis results of some monomer buildings,this method can be used to rapidly predict the vulnerability of similar buildings in this region.However,the engineering practices show that the damage prediction results by applying this method in the group buildings’earthquake damage are obviously different from the traditional earthquake statistics experiences,and the damage is lighter in many cases.Therefore,this thesis aims at establishing a more reasonable seismic damage prediction method for brick masonry and reinforced concrete frame group buildings based on the previous works,through which the damage results will be more consistent with traditional earthquake statistics experiences.The main contents of this thesis are as follows:1.The accuracy of the sample library is the guarantee of the reliability of APMSD,therefore,the establishment method of sample library is optimized firstly.In this thesis,the reinforced concrete frame structure is modeled by ETABS software so as to analysis its seismic damage,and the results are compared with that obtained by the corresponding disaster planning prevention method(DPPM);similarly,the beyond strength ratio method(BSRM)is used to analysis the seismic damage of brick structure,and its results are also compared with the results obtained by the corresponding DPPM.The examples results show that the seismic damage results of both reinforced concrete frame structure and brick structure using DPPM are lighter than their corresponding comparison results.Then,the DPPM is optimized and revised,and the optimized method is also used to predict the seismic damage of the structure.It shows that the results obtained by the optimized DPPM are more consistent with that got by ETABS software for reinforced concrete frame structure and BSRM for brick structure,which implied that the optimized DPPM is more powerful and reliable.2.The APMSD was simply introduced firstly,and then based on the survey data of buildings in a city of China and the experience of previous seismic damage,a improved gray relational analysis method(IGRAM)is used to determine the main seismic performance factors and their respective weights for the reinforced concrete frame and the brick masonry,respectively,which makes the selected seismic performance factors can reflect to the seismic capacity of the actual buildings more fully.After the correction of various influence factors,the least square method(LSM)is used to determine the seismic damage results.Finally,the efficiency and applicability of the proposed method are validated by two examples(one is a frame structure,while the other one is masonry structure).3.The vulnerability of reinforced concrete frame and brick masonry in a city of China is analyzed by the optimized method and the method without optimization,respectively,and the results are compared with each other.It shows that the optimized method is more suitable for seismic vulnerability analysis.