中国与孟加拉国抗震设计地震加速度转换的探讨

Conversion of design acceleration of seismic ground motion between China and Bangladesh standards

孟加拉国的建筑工程采用中国标准时,当地标准提供的地震加速度值不能直接采用。为了进行中国与孟加拉国标准抗震设计地震加速度的换算,从地震加速度的基本概念、定义和确定方法入手,对中孟标准地震加速度取值问题进行了比较研究。结果表明:1)在场地类别划分的规定上,孟标的SA类场地与中标的I_(0)场地基本对应,这是中孟标准地震加速度转换计算的前提;2)通过场地类别和重现期的换算,中孟标准间实现了地震加速度的转换,孟加拉国标准中地震分区Z1(0.12g)、Z2(0.20g)、Z3(0.28g)和Z4(0.36g)分别对应于中国标准的6度(0.05g)、7度(0.10g)、7度(0.15g)和8度(0.20g);3)通过换算得到的地震加速度可适用于一般性建筑工程,有特殊要求的建筑工程可通过专门地震安全性评价确定抗震设计地震加速度。

When Chinese building standard is adopted in Bangladesh construction,the seismic ground acceleration provided in Bangladesh standard cannot be adopted directly.In order to converse seismic ground acceleration between China standard and Bangladesh standard,the value of seismic ground acceleration of two standards was compared and analyzed from the concept,definition and determination methods.The result shows that:1)In term of site class,SA in Bangladesh standard corresponds to I_(0) in China standard,that is the premise of seismic ground acceleration conversion between two standards;2)The seismic ground acceleration conversion is realized by conversing site class and return period.The seismic zonation Z1(0.12g)、Z2(0.20g)、Z3(0.28g)and Z4(0.36g)in Bangladesh standard corresponds to earthquake intensity 6(0.05g)、7(0.10g)、7(0.15g)and 8(0.20g)in Chinese standard;3)The seismic ground acceleration obtained from conversion can be applied for general buildings engineering.The design seismic ground acceleration for buildings that have special requirement should be determined by seismic risk assessment.