丘陵地区木结构房屋地震易损性分析

IF 1.4 4区 工程技术 Q3 ENGINEERING, CIVIL
S. Ghosh, S. Chakraborty
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引用次数: 0

摘要

对丘陵地区木结构建筑的抗震性能进行了综合研究。具体而言,对印度东北地区不同地点的典型木结构建筑进行了地震易损性评估。考虑剪力墙在侧向荷载作用下的非线性行为,建立了木结构建筑的三维简化模型。在此过程中,提出了一种具有改进能力的三线性模型,以捕获剪力墙的力-变形行为,包括在较高变形下的强度退化。通过与已有试验结果的比较,验证了该模型对剪力墙受力变形特性的描述能力的提高。结构需求值是通过对三维木结构模型的非线性时程分析(NLTHA)得到的,考虑了地震动和结构参数记录间变化的不确定性影响。NLTHA所需的地震动仓是根据所考虑位置的概率地震危险分析确定的危险级别来准备的。从观测到的破坏案例中得到对数正态易损性参数的最大似然估计,并据此估计不同位置对应的地震易损性。数值计算结果表明,该地区常见的木结构结构在地震发生时,其剪力墙在相应的地震危险度下可能出现较小的开裂或破坏;然而,对于这些结构的完全倒塌,风险可以忽略不计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Seismic fragility analysis of wood frame building in hilly region
A comprehensive study on seismic performance of wood frame building in hilly regions is presented. Specifically, seismic fragility assessment of a typical wood frame building at various locations of the northeast region of India are demonstrated. A three-dimensional simplified model of the wood frame building is developed with due consideration to nonlinear behaviour of shear walls under lateral loads. In doing so, a trilinear model having improved capability to capture the force-deformation behaviour of shear walls including the strength degradation at higher deformations is proposed. The improved capability of the proposed model to capture the force-deformation behaviour of shear wall is validated by comparing with the existing experimental results. The structural demand values are obtained from nonlinear time history analysis (NLTHA) of the three-dimensional wood frame model considering the effect of uncertainty due to record to record variation of ground motions and structural parameters as well. The ground motion bins necessary for NLTHA are prepared based on the identified hazard level from probabilistic seismic hazard analysis of the considered locations. The maximum likelihood estimates of the lognormal fragility parameters are obtained from the observed failure cases and the seismic fragilities corresponding to different locations are estimated accordingly. The results of the numerical study show that the wood frame constructions commonly found in the region are likely to suffer minor cracking or damage in the shear walls under the earthquake occurrence corresponding to the estimated seismic hazard level; however, poses negligible risk against complete collapse of such structures.
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来源期刊
Earthquakes and Structures
Earthquakes and Structures ENGINEERING, CIVIL-ENGINEERING, GEOLOGICAL
CiteScore
2.90
自引率
20.00%
发文量
0
审稿时长
>12 weeks
期刊介绍: The Earthquakes and Structures, An International Journal, focuses on the effects of earthquakes on civil engineering structures. The journal will serve as a powerful repository of technical information and will provide a highimpact publication platform for the global community of researchers in the traditional, as well as emerging, subdisciplines of the broader earthquake engineering field. Specifically, some of the major topics covered by the Journal include: .. characterization of strong ground motions, .. quantification of earthquake demand and structural capacity, .. design of earthquake resistant structures and foundations, .. experimental and computational methods, .. seismic regulations and building codes, .. seismic hazard assessment, .. seismic risk mitigation, .. site effects and soil-structure interaction, .. assessment, repair and strengthening of existing structures, including historic structures and monuments, and .. emerging technologies including passive control technologies, structural monitoring systems, and cyberinfrastructure tools for seismic data management, experimental applications, early warning and response
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