Height limitations are not uncommon in multi-storey buildings due to economic requirements and esthetical considerations. Substantial spaces are normally required to enable the passage of large pipes and ducts beneath...Height limitations are not uncommon in multi-storey buildings due to economic requirements and esthetical considerations. Substantial spaces are normally required to enable the passage of large pipes and ducts beneath steel beams leading to uneconomic floor heights. The most adopted solution for this issue is the use of steel beam web openings to provide the required space for services. These openings could lead to a significant decrease of the beam load carrying capacity depending on the adopted openings shape, size and location. These aspects motivated the present study based on FE simulations calibrated against numerical and test results. The results accuracy enabled a comprehensive parametric analysis of beams with web openings to be made focused on the profile size, web opening location, among others. The study also investigated the efficiency of longitudinal stiffeners welded at the opening region and benefits of using an adequate edge concordance radius in beams with rectangular and square openings. The obtained results showed the need of using welded longitudinal stiffeners in order to increase the beams ultimate load carrying capacity. This adoption can double or even triple the ultimate load of beams with rectangular and square opening heights equal to 0.75 H, respectively.展开更多
计算机辅助设计技术网络化能有效地整合各种科技资源,提升创新能力。该文提出了一种基于Web的网络化电机CAD系统架构和技术路线。阐述了网络化电机CAD系统的组成要素,信息流和数据流的传输特点。利用ActiveX组件技术和ASP(active server...计算机辅助设计技术网络化能有效地整合各种科技资源,提升创新能力。该文提出了一种基于Web的网络化电机CAD系统架构和技术路线。阐述了网络化电机CAD系统的组成要素,信息流和数据流的传输特点。利用ActiveX组件技术和ASP(active server pages)Web应用程序开发技术,将电机CAD、ANSYS有限元分析和HTML有机结合。详细给出了电机设计ActiveX DLL的具体实现,建立了直接用网页浏览器进行电机设计仿真的集成平台,并给出具体示例,验证了系统架构的可行性和有效性。展开更多
文摘Height limitations are not uncommon in multi-storey buildings due to economic requirements and esthetical considerations. Substantial spaces are normally required to enable the passage of large pipes and ducts beneath steel beams leading to uneconomic floor heights. The most adopted solution for this issue is the use of steel beam web openings to provide the required space for services. These openings could lead to a significant decrease of the beam load carrying capacity depending on the adopted openings shape, size and location. These aspects motivated the present study based on FE simulations calibrated against numerical and test results. The results accuracy enabled a comprehensive parametric analysis of beams with web openings to be made focused on the profile size, web opening location, among others. The study also investigated the efficiency of longitudinal stiffeners welded at the opening region and benefits of using an adequate edge concordance radius in beams with rectangular and square openings. The obtained results showed the need of using welded longitudinal stiffeners in order to increase the beams ultimate load carrying capacity. This adoption can double or even triple the ultimate load of beams with rectangular and square opening heights equal to 0.75 H, respectively.
文摘计算机辅助设计技术网络化能有效地整合各种科技资源,提升创新能力。该文提出了一种基于Web的网络化电机CAD系统架构和技术路线。阐述了网络化电机CAD系统的组成要素,信息流和数据流的传输特点。利用ActiveX组件技术和ASP(active server pages)Web应用程序开发技术,将电机CAD、ANSYS有限元分析和HTML有机结合。详细给出了电机设计ActiveX DLL的具体实现,建立了直接用网页浏览器进行电机设计仿真的集成平台,并给出具体示例,验证了系统架构的可行性和有效性。
