Study On Safety Assessment Quantitative Model For Buildings On Post-earthquake Field And Design Of Network-based Safety Assessment System Framework

In the emergency period after the occurrence of strong earthquake, identifying the safety and inhabitability of the seismic building for predetermined function is an important part of earthquake emergency work on site, moreover it’s an effective way to guarantee safety of human lives and property, rapidly restore social order, and implement disaster relief scientifically and orderly.At present, the implementation of the safety assessment on seismic site in our country mainly relies on the experience and expertise of experts.As the standard of this work, Post-earthquake Field Works, Part 2: Safety Assessment of Buildings(GB18208.2-2001) only provides qualitative terms.Limit of the number of experts and individual differences restrict the efficiency of the assessment work. It leads to failure to meet the actual needs of people in disaster areas.In view of disadvantages of the qualitative assessment, this paper establishes the damage quantitative assessment model for seismic buildings.Based on Wenchuan earthquake and Lushan earthquake seismic data,combining with the national standards, quantitative assessment model is established considering different contribution degree of each component. Furthermore, a network version safety assessment system is developed centered on the established models. The main research work and results are as follows:(1) Based on the assessment terms of multi-story masonry structure in Post-earthquake Field Works, Part 2: Safety Assessment of Buildings(GB18208.2-2001), and the Wenchuan and Lushan earthquake damageinvestigation results, the component categories and component category details are confirmed using the analytic hierarchy process(AHP).And damage assessment criterion of component category details is defined.Moreover, to quantify the component category details,earthquake damage evaluation coefficients are proposed. The earthquake damage index of the building is determined. Seismic damage data from Wenchuan earthquake and Lushan earthquake are collected, safety assessment quantitative model considering different contributions to the extent of the component categories is established for multi-story masonry structure utilizing residual analysis method. The coefficients for the southwest region of China are determined by the least square method regression. Random examples are selected from the earthquake data to test the assessment scientificity and reliability of the model.(2) By use of the analytic hierarchy process(AHP), combined with the assessment terms in the standard and analysis of typical seismic damages in Wenchuan earthquake, the component categories and component category details which influence the overall seismic damage of the multi-story and high-rise reinforced concrete structure are confirmed. The damage assessment criterion of component category details is defined, and earthquake damage evaluation coefficients are proposed to quantify the component category details. Based on the seismic damage data from Wenchuan earthquake and Lushan earthquake, safety assessment quantitative model considering different contributions to the extent of the component categories is established for multi-story and high-rise reinforced concrete structure utilizing residual analysis method. The coefficients are determined by the least square method regression. Random examples are selected from the earthquake data to test the assessment effect of the model.(3) For the quantitative study of seismic damage of the bottom frame structure, the bottom frame part and the upper masonry part are considered respectively. First of all, combined with the typical seismic damages of the bottom frame structures, the component category details, damage assessment criterion and damage evaluation coefficients are determined. Based on the assessment quantitative models of multi-story masonry structure and multi-story and high-rise reinforced concrete structure, safety assessment quantitative model for the bottom frame structure is established considering different parts. Finally, Random examples are selected from the earthquake data to test the assessment effect of the model. The results are proved relatively scientific and reliable.(4) Embedded into the models for different structures, an on-site earthquake safety evaluation system for buildings is developed based on the network platform, with using modular design and layered architectural approach. The system realizes the assessment function for the appraisal personnel to damaged buildings after earthquakes, and real-timely statistical analyses and data sharing of the assessment results.In addition, the online assessment system is convenient for centralized management and timely updates of model coefficients. Comprehensive function and performance test show that the system is efficient and convenient to assess seismic buildings, and has scientificity and stability. It’s suitable for application of seismic assessment on site in China.