In order to clarify the damage identification method applicable to each member type of beam string structures with an improved configuration of lower chords and struts, and to reduce misjudgments at non-damaged members, this paper proposes a damage identification index based on sub-component curvature variation and structural modes. The validity of the index was illustrated by analyzing a simply supported beam structure with a simple structural form. The finite element software ANSYS was used to establish the analysis model of beam string structures with an improved configuration of lower chords and struts. The damage of the members was simulated by reducing the elastic modulus of the member elements. Considering the symmetry and complexity of the structure, damage conditions of single damage, multiple damage, and small damage level were set up on the members at the mid-span, quarter-span, and near the bearing ends, respectively. The improved curvature absolute difference index of sub-components and the sub-component curvature variation based on structural mode proposed in this paper were used for the comparative analysis of damage identification. The findings demonstrate that the index of sub-component curvature variation based on structural modes can achieve the precise localization of single and multiple damages in the structure. This index is also highly sensitive to slight damage, making it an effective method for identifying damage to beam string structures with an improved configuration of lower chords and struts.
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Metro parking lots are important transit hubs for urban rail transit systems. The metro parking lot construction process involves components with engineering characteristics such as multiple specialization fields, large volumes, and complex forms. Building information modeling (BIM) technology plays a significant role in the project construction process with the advantages of informatization, parametrization, and visualization. Traditional modeling methods have difficulties in BIM model creation, repetitive work, and complex component splicing. This method leads to low modeling efficiency, directly affecting the construction application and promotion of BIM technology in metro parking lot projects.
This study introduces the product design concept of manufacturing- oriented fabrication and assembly (DFMA). It studies and designs a rapid modeling method for subway parking lot components for DFMA. By combining and analyzing numerous subway parking lot component design drawings, we analyze the component types, composition rules, data architecture, and other data in the drawings. In terms of manufacturing and assembly, we extract the verified design data and form the component design rules. To realize the component modeling method of DFMA, combined with BIM and parametric design, the design standard is realized by integrating it into BIM software and determined from the BIM software platform Revit secondary development tool software to realize rapid modeling. Based on DFMA and the parametric standard components created by the tool software, a cloud-based component library is developed synchronously to facilitate the storage and call of components. This paper studies the module library system architecture and data flow and analyzes the entire life cycle optimization design process based on the cloud-based module library. Finally, the structure of a metro parking lot project in the Changsha area is tested and compared.
The results show that the DFMA-based product design method improved the modeling speed over the traditional method. The modeling speed is increased by approximately 60% on average, and mold loss during component production is reduced by approximately 20%. The created model is highly accurate and can be used to process and manufacture prefabricated components in a factory. Furthermore, the degree of model standardization is greatly improved after preliminary sorting and analysis to formulate the design rules of the components.
This study verifies the feasibility and practicality of the design method using actual engineering cases. The product design concept of DFMA is introduced to associate the design and production of the components. According to the BIM software Revit, the parametric design of the components is realized, and the application of DFMA is associated with manufacturing and installing subway parking lot components, making the components easy to produce and install. In addition, the design method accelerates the development of BIM technology in metro parking lots and strengthens digital collaboration in design and production. This helps to promote the digital design and construction of metro parking lots.
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