The focus of the Hazus earthquake model has been largely U.S. centric due to a lack of standardized building-infrastructure data formats applicable elsewhere.In a combined effort between FEMA Region VIII and the Unive...The focus of the Hazus earthquake model has been largely U.S. centric due to a lack of standardized building-infrastructure data formats applicable elsewhere.In a combined effort between FEMA Region VIII and the Universidad de Los Andes, Venezuela, the present study uses the Hazus 2.1 software to simulate earthquake loss estimations for Venezuela. Population totals and demographic distributions were developed using Oak Ridge National Labs Landscan 2008 population data and the census 2011 for Venezuela. The accuracy of the model was further enhanced for Me′rida State, located in western Venezuela, by collecting, incorporating, and developing region and specific inventories including soil maps, liquefaction and landslide susceptibility studies, demographic data, and building inventory information. We used USGS Shake Maps scenarios for two potential earthquake events with peak ground accelerations proposed within Performance Based Seismic Engineering of Buildings, VISION 2000 recommendations. The region has not witnessed an earthquake with a magnitude greater than M 7 in the last120 years. Given the historical record of seismicity and the seismotectonics in the region, it becomes increasingly important to understand the potential implications from moderate to large earthquakes in Me′rida State, Venezuela.展开更多
This paper presents a performance-based methodology for the assessment of seismic vulnerability and capacity of buildings. The vulnerability assessment methodology is based on the HAZUS methodology and the improved ca...This paper presents a performance-based methodology for the assessment of seismic vulnerability and capacity of buildings. The vulnerability assessment methodology is based on the HAZUS methodology and the improved capacity- demand-diagram method. The spectral displacement (Sd) of performance points on a capacity curve is used to estimate the damage level of a building. The relationship between Sd and peak ground acceleration (PGA) is established, and then a new vulnerability function is expressed in terms of PGA. Furthermore, the expected value of the seismic capacity index (SCev) is provided to estimate the seismic capacity of buildings based on the probability distribution of damage levels and the corresponding seismic capacity index. The results indicate that the proposed vulnerability methodology is able to assess seismic damage of a large number of building stock directly and quickly following an earthquake. The SCev provides an effective index to measure the seismic capacity of buildings and illustrate the relationship between the seismic capacity of buildings and seismic action. The estimated result is compared with damage surveys of the cities of Dujiangyan and Jiangyou in the M8.0 Wenchuan earthquake, revealing that the methodology is acceptable for seismic risk assessment and decision making. The primary reasons for discrepancies between the estimated results and the damage surveys are discussed.展开更多
Immunization and upgrading of structures are for the prevention of physical and financial losses due to earthquake. The importance of structures is not the same regarding the physical and financial losses caused by th...Immunization and upgrading of structures are for the prevention of physical and financial losses due to earthquake. The importance of structures is not the same regarding the physical and financial losses caused by the earthquake damage, although the responsibility to improve and secure them in terms of providing financing according to the type of ownership is different. The formulation of rules, regulations and necessary letters, the supervision over the various stages of immunization, and the establishment of appropriate facilities are in accordance with the financial and executive capacity of the country, the prioritization and preparation of a major plan for the improvement and securing of government responsibilities. Old buildings in worn-out textures generally have a wall system without vertical and horizontal shafts. The experiences from Boijin Zahra, Tabas, Rudbar and Bam earthquakes indicate that the destruction of such buildings in the time of devastating shakes is definite. The importance of structures is not the same considering the physical and financial losses caused by the earthquake damage. The principal destruction and rehabilitation for prevention of physical and financial losses due to the earthquake in terms of providing financing and according to the type of ownership varies, and this requires a rebuild time and high costs for the employer. Therefore, it is recommended that according to the conditions of the buildings of the country, arrangements and decisions, whether for financial facilities, etc. are considered so that everyone can carry out the executive steps of the safe room according to their existing structures.展开更多
文摘The focus of the Hazus earthquake model has been largely U.S. centric due to a lack of standardized building-infrastructure data formats applicable elsewhere.In a combined effort between FEMA Region VIII and the Universidad de Los Andes, Venezuela, the present study uses the Hazus 2.1 software to simulate earthquake loss estimations for Venezuela. Population totals and demographic distributions were developed using Oak Ridge National Labs Landscan 2008 population data and the census 2011 for Venezuela. The accuracy of the model was further enhanced for Me′rida State, located in western Venezuela, by collecting, incorporating, and developing region and specific inventories including soil maps, liquefaction and landslide susceptibility studies, demographic data, and building inventory information. We used USGS Shake Maps scenarios for two potential earthquake events with peak ground accelerations proposed within Performance Based Seismic Engineering of Buildings, VISION 2000 recommendations. The region has not witnessed an earthquake with a magnitude greater than M 7 in the last120 years. Given the historical record of seismicity and the seismotectonics in the region, it becomes increasingly important to understand the potential implications from moderate to large earthquakes in Me′rida State, Venezuela.
基金National Natural Science Foundation of China Under Grant No.50908216Postdoctoral Science Foundation of China Under Grant No.20070420878
文摘This paper presents a performance-based methodology for the assessment of seismic vulnerability and capacity of buildings. The vulnerability assessment methodology is based on the HAZUS methodology and the improved capacity- demand-diagram method. The spectral displacement (Sd) of performance points on a capacity curve is used to estimate the damage level of a building. The relationship between Sd and peak ground acceleration (PGA) is established, and then a new vulnerability function is expressed in terms of PGA. Furthermore, the expected value of the seismic capacity index (SCev) is provided to estimate the seismic capacity of buildings based on the probability distribution of damage levels and the corresponding seismic capacity index. The results indicate that the proposed vulnerability methodology is able to assess seismic damage of a large number of building stock directly and quickly following an earthquake. The SCev provides an effective index to measure the seismic capacity of buildings and illustrate the relationship between the seismic capacity of buildings and seismic action. The estimated result is compared with damage surveys of the cities of Dujiangyan and Jiangyou in the M8.0 Wenchuan earthquake, revealing that the methodology is acceptable for seismic risk assessment and decision making. The primary reasons for discrepancies between the estimated results and the damage surveys are discussed.
文摘Immunization and upgrading of structures are for the prevention of physical and financial losses due to earthquake. The importance of structures is not the same regarding the physical and financial losses caused by the earthquake damage, although the responsibility to improve and secure them in terms of providing financing according to the type of ownership is different. The formulation of rules, regulations and necessary letters, the supervision over the various stages of immunization, and the establishment of appropriate facilities are in accordance with the financial and executive capacity of the country, the prioritization and preparation of a major plan for the improvement and securing of government responsibilities. Old buildings in worn-out textures generally have a wall system without vertical and horizontal shafts. The experiences from Boijin Zahra, Tabas, Rudbar and Bam earthquakes indicate that the destruction of such buildings in the time of devastating shakes is definite. The importance of structures is not the same considering the physical and financial losses caused by the earthquake damage. The principal destruction and rehabilitation for prevention of physical and financial losses due to the earthquake in terms of providing financing and according to the type of ownership varies, and this requires a rebuild time and high costs for the employer. Therefore, it is recommended that according to the conditions of the buildings of the country, arrangements and decisions, whether for financial facilities, etc. are considered so that everyone can carry out the executive steps of the safe room according to their existing structures.
