【摘要】 结构动力计算是地震工程和结构动力学的重要环节,将地理信息系统(GIS)与多自由度(MDOF)结构动力计算模型耦合,可以实现大范围区域内结构体动力反应的快速计算。GIS平台下,将建筑物结构体抽象为剪切层模型并以2D或者3D实体存储在空间数据库中,通过Jocabi特征值算法求解MDOF振型和Newmark-β算法求解地震的时程反应,并根据位移计算结果实现了建筑物震害破坏等级的分类评价,最终计算结果可以二维图形或者三维可视化的形式在GIS中显示。实例计算结果表明,GIS耦合模型能够高效地实现震灾影响范围内大量MDOF体系的动力反应计算。根据动力反应结果将建筑物地震破坏进行等级划分,并在GIS中可视化计算结果,这将有助于快速预估建筑物结构的破坏程度和分布,为地震应急救援和损失评估提供有力的数据支持。更多还原

【Abstract】 Structure dynamic analysis is an important link of earthquake engineering and structural dynamics. With an integration of a geographic information system( GIS) and multiple degree of freedom( MDOF) model for structure dynamic analysis,the dynamic response calculation in a wide range area can be realized with a high speed. In the GIS platform,the structural buildings are abstracted as shear lateral models which are stored in a spatial database with 2D or 3D entities. The MDOF modal and response time history analysis are implemented by Jacobi algorithm for the eigenvalue problem and Newmark- β algorithm respectively. With the seismic response results of displacement,the earthquake performance of structures can be evaluated according to damage indexes,and can be visualized in the GIS with 2D or 3D form. The case study results show that the proposed integrated system can perform a large number of MDOF dynamic response calculations of structures in the earthquake affected area effectively,classify the damage degree from the dynamic response results of structures,and give the visualized results.These can facilitate the estimation of damage degree and distribution of structures,and provide the data support for seismic emergency rescue and loss estimation.更多还原