%0 Journal Article %T 脉冲型地震动作用下尼泊尔砖木遗产建筑易损性分析<br>Seismic Fragility Analysis of Nepalese Brick-Timber Heritage Structures under Near-Fault Pulse-Like Ground Motions %A 潘毅 %A 王晓玥 %A 许浒 %A 谢丹< %A br> %A PAN Yi %A WANG Xiaoyue %A XU Hu %A XIE Dan %J 西南交通大学学报 %D 2017 %R 10.3969/j.issn.0258-2724.2017.06.016 %X 为研究近断层脉冲型地震对尼泊尔砖木结构遗产建筑抗震性能的影响，以一栋2层的砖木结构遗产建筑为例，采用等效框架方法，以地面峰值加速度作为地震动强度指标和层间位移角作为结构损伤指标对其进行动力增量分析，确定了结构极限破坏状态，并分别对结构在脉冲型和非脉冲型地震作用下的易损性曲线进行了比较.研究结果表明：砖木遗产建筑在正常使用、生命安全和防止倒塌3种不同极限状态下对应的层间位移角分别为0.06%、0.32%和0.44%；该类建筑在遭遇地震时有较高的概率达到正常使用极限状态，但其超越生命安全和防止倒塌极限状态的概率相对较低；当达到或超过生命安全状态之后，较小的地面峰值加速度增量就可能导致砖木遗产建筑达到防止倒塌状态；与非脉冲型地震动下的结构响应相比，脉冲型地震动下达到正常使用、生命安全和防止倒塌3个极限状态的概率分别高出18.9%、14.3%和12.6%，在震后修复和加固中应对近断层脉冲型地震动的激励特征予以充分考虑.<br>：To study the influence of near-fault pulse-like ground motions on the seismic performance of masonry-timber heritage structures in Nepal, a two-storey Nepalese masonry-timber structure was selected as a prototype according to the typical seismic damage mode in the Gorkha earthquake. A numerical simulation was established by means of the equivalent-frame model. The peak ground accelerations and inter-storey drift were used as indexes for ground motion intensity and the structural damage, respectively; subsequently, the IDA (incremental dynamic analysis) method was used to determine the ultimate states. Additionally, the seismic fragility curves of the structure subjected to pulse-like and non-pulse-like ground motions were compared. The results indicate that the inter-storey drift corresponding to the immediate occupancy state, life safety state, and collapse prevention state are 0.06%, 0.32%, and 0.44%, respectively. Although it is prone to the immediate occupancy state of the structures according to the damage probability curves, the probability of reaching the life safety state or collapse prevention state is relatively low.However, as the limit of life safety state is reached or exceeded, a slight PGA increment could lead to structural collapse. Further, with respect to the case experiencing non-pulse-like ground motions, the damage probabilities for immediate occupancy state, life safety state, and collapse prevention are to 18.9%, 14.3%, and 12.6% higher than the pulse-like ground motion case, respectively. In addition, due to the sensitivity of Nepalese masonry-timber heritage structures, the effect of pulse-like ground motions should be considered in practical reconstruction and retrofitting projects %K 尼泊尔砖木结构 %K 文化遗产建筑 %K 脉冲型地震动 %K 近断层 %K 地震易损性 %K 等效框架 %K < %K br> %K nepalese brick-timber structures %K cultural heritage buildings %K pulse-like ground motions %K near-fault %K seismic fragility analysis %K equivalent frame %U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12515.shtml