美国、新加坡、日本、韩国等多个国家已在建筑行业提出建筑信息模型(Building Information Modeling,BIM)应用要求,并建立了BIM国家级应用标准。我国引入BIM技术较晚,技术尚不成熟,目前正在各个行业,特别是铁路、建筑、水电行业推广BIM...美国、新加坡、日本、韩国等多个国家已在建筑行业提出建筑信息模型(Building Information Modeling,BIM)应用要求,并建立了BIM国家级应用标准。我国引入BIM技术较晚,技术尚不成熟,目前正在各个行业,特别是铁路、建筑、水电行业推广BIM技术。中国铁路总公司各所属单位也已纷纷开展部分BIM技术研究及应用实践工作,如铁一局、铁二局等工程局和铁二院已投入了多个试点项目,发展较快。本文以某项目为工程背景,针对该工程桥梁三维模型中桥墩钢筋的创建过程,介绍CATIA(Computer-Aided Three-dimensional Interactive Application)高级知识工程在BIM桥梁钢筋建模中的应用。此应用方法可快速创建结构复杂桥墩内不同型号的钢筋,较一般的三维建模方法来讲更为快捷、方便,很大程度上提高了设计人员的工作效率,也为后续在虚拟施工仿真、施工工艺指导、施工信息化等方面提供了重要的基础信息。展开更多
如今国内的建筑信息模型(Building Information Modeling,BIM)正在飞速的发展,但对于将钢筋排进建筑模型中的应用还是很少的。若采用传统的方式画钢筋,会导致建模的效率降低,因此运用Revit二次开发的技术,实现在楼梯中自动排列钢筋的功...如今国内的建筑信息模型(Building Information Modeling,BIM)正在飞速的发展,但对于将钢筋排进建筑模型中的应用还是很少的。若采用传统的方式画钢筋,会导致建模的效率降低,因此运用Revit二次开发的技术,实现在楼梯中自动排列钢筋的功能,能够提高工作效率,加快模型的建立。展开更多
Fiber reinforced cementitious composites(ECC) are a class of advanced composites with strain hardening and multiple cracking behaviors. Substitution of concrete with ECC can significantly improve the seismic resistanc...Fiber reinforced cementitious composites(ECC) are a class of advanced composites with strain hardening and multiple cracking behaviors. Substitution of concrete with ECC can significantly improve the seismic resistance and durability of the infrastructures. In this paper, it is proposed to use ECC as the matrix of frame columns for improving its load carrying capacity, ductility, and avoiding the brittleness of concrete. Based on the assumption of plane remaining plane and constitutive models of materials, theoretical models for calculating the load-carrying capacity of the steel reinforced ECC columns under small and large eccentric compression are proposed. With the parameters of the constitutive models from the existing experimental data, the relationship between ultimate axial load and moment capacities is also derived with the proposed models. To verify the validity of the proposed theoretical models, finite element analysis with the software of ATENA is conducted to simulate the mechanical behavior of the steel reinforced ECC columns under eccentric compressive loading. The calculation results from the theoretical models show good consistency with the simulated results, indicating that the proposed models are feasible and reliable for design. Finally, based on the theoretical models, the effect of the ultimate tensile strain and compressive strength of ECC, longitudinal reinforcement ratio on the load carrying capacity of the steel reinforced ECC column are comprehensively studied.展开更多
文摘如今国内的建筑信息模型(Building Information Modeling,BIM)正在飞速的发展,但对于将钢筋排进建筑模型中的应用还是很少的。若采用传统的方式画钢筋,会导致建模的效率降低,因此运用Revit二次开发的技术,实现在楼梯中自动排列钢筋的功能,能够提高工作效率,加快模型的建立。
基金supported by the National Natural Science Foundation of China(Grant No.51278118)the Natural Science Foundation of Jiangsu Province(Grant No.BK2012756)the Scientific Research Project of Ministry of Education of China(Grant No.113029A)
文摘Fiber reinforced cementitious composites(ECC) are a class of advanced composites with strain hardening and multiple cracking behaviors. Substitution of concrete with ECC can significantly improve the seismic resistance and durability of the infrastructures. In this paper, it is proposed to use ECC as the matrix of frame columns for improving its load carrying capacity, ductility, and avoiding the brittleness of concrete. Based on the assumption of plane remaining plane and constitutive models of materials, theoretical models for calculating the load-carrying capacity of the steel reinforced ECC columns under small and large eccentric compression are proposed. With the parameters of the constitutive models from the existing experimental data, the relationship between ultimate axial load and moment capacities is also derived with the proposed models. To verify the validity of the proposed theoretical models, finite element analysis with the software of ATENA is conducted to simulate the mechanical behavior of the steel reinforced ECC columns under eccentric compressive loading. The calculation results from the theoretical models show good consistency with the simulated results, indicating that the proposed models are feasible and reliable for design. Finally, based on the theoretical models, the effect of the ultimate tensile strain and compressive strength of ECC, longitudinal reinforcement ratio on the load carrying capacity of the steel reinforced ECC column are comprehensively studied.
