A multiple-time-scale algorithm is developed to numerically simulate certain structural components in civil structures where local defects inevitably exist. Spatially, the size of local defects is relatively small com...A multiple-time-scale algorithm is developed to numerically simulate certain structural components in civil structures where local defects inevitably exist. Spatially, the size of local defects is relatively small compared to the structural scale. Different length scales should be adopted considering the efficiency and computational cost. In the principle of physics, different length scales are stipulated to correspond to different time scales. This concept lays the foundation of the framework for this multiple-time-scale algorithm. A multiple-time-scale algorithm, which involves different time steps for different regions, while enforcing the compatibility of displacement, force and stress fields across the interface, is proposed. Furthermore, a defected beam component is studied as a numerical sample. The structural component is divided into two regions： a coarse one and a fine one; a micro-defect exists in the fine region and the finite element sizes of the two regions are diametrically different. Correspondingly, two different time steps are adopted. With dynamic load applied to the beam, stress and displacement distribution of the defected beam is investigated from the global and local perspectives. The numerical sample reflects that the proposed algorithm is physically rational and computationally efficient in the potential damage simulation of civil structures.展开更多
为解决铁路土建工程建筑信息模型(BIM,Building Information Modeling)设计过程中出现的重复建模和数据传递不畅等问题,以路基、桥梁、隧道专业为代表,从三维协同设计环境出发,提出了信息传递及设计成熟度管理方法,实现了模型数据的有...为解决铁路土建工程建筑信息模型(BIM,Building Information Modeling)设计过程中出现的重复建模和数据传递不畅等问题,以路基、桥梁、隧道专业为代表,从三维协同设计环境出发,提出了信息传递及设计成熟度管理方法,实现了模型数据的有效管理及BIM技术标准的有效实施;围绕“骨架–模板”设计方法,提出以骨架设计、构件模板装配设计形成的土建工程BIM设计流程,实现了三维BIM环境下的土建工程设计流程再造;对土建工程间的接口设计技术进行研究,充分发挥了协同设计环境在土建工程领域的应用价值。该研究为满足各专业信息需求提供了有效路径,可为后续BIM技术在铁路工程中的应用提供借鉴。展开更多
基金supports from NSFC(No.11302078)China Postdoctoral Science Foundation(No.2013M531139)Shanghai Postdoctoral Sustentation Fund(No.12R21412000)
文摘A multiple-time-scale algorithm is developed to numerically simulate certain structural components in civil structures where local defects inevitably exist. Spatially, the size of local defects is relatively small compared to the structural scale. Different length scales should be adopted considering the efficiency and computational cost. In the principle of physics, different length scales are stipulated to correspond to different time scales. This concept lays the foundation of the framework for this multiple-time-scale algorithm. A multiple-time-scale algorithm, which involves different time steps for different regions, while enforcing the compatibility of displacement, force and stress fields across the interface, is proposed. Furthermore, a defected beam component is studied as a numerical sample. The structural component is divided into two regions： a coarse one and a fine one; a micro-defect exists in the fine region and the finite element sizes of the two regions are diametrically different. Correspondingly, two different time steps are adopted. With dynamic load applied to the beam, stress and displacement distribution of the defected beam is investigated from the global and local perspectives. The numerical sample reflects that the proposed algorithm is physically rational and computationally efficient in the potential damage simulation of civil structures.
文摘为解决铁路土建工程建筑信息模型(BIM,Building Information Modeling)设计过程中出现的重复建模和数据传递不畅等问题,以路基、桥梁、隧道专业为代表,从三维协同设计环境出发,提出了信息传递及设计成熟度管理方法,实现了模型数据的有效管理及BIM技术标准的有效实施;围绕“骨架–模板”设计方法,提出以骨架设计、构件模板装配设计形成的土建工程BIM设计流程,实现了三维BIM环境下的土建工程设计流程再造;对土建工程间的接口设计技术进行研究,充分发挥了协同设计环境在土建工程领域的应用价值。该研究为满足各专业信息需求提供了有效路径,可为后续BIM技术在铁路工程中的应用提供借鉴。
