Research Article
Performance of Simplified Damage-Based Concrete Models in Seismic Applications
Jesus Salazar Lopez,
Bernardo Garcia Ramirez,
Clayton Pettit*
,
Carlos Cruz-Noguez
Issue:
Volume 12, Issue 4, August 2024
Pages:
95-107
Received:
19 June 2024
Accepted:
5 July 2024
Published:
15 July 2024
Abstract: Significant progress in the finite-element (FE) modeling at the member-level of reinforced-concrete (RC) structures under seismic excitation has been achieved in the past decades; however, reliable and accurate analysis models for full-scale 3D system-level RC structures validated with experimental data are scarce. As the development of a complete nonlinear model is expensive and time consuming, simpler models, typically elastic or lumped-plastic in nature, are employed in practice with additional provisions prescribed to account for nonlinear behavior. Depending on the assumptions made by the analyst, there may be substantial uncertainties related to the response of a complete structure. Capturing global failure modes is challenging, and the assessment of strength and ductility capacities may be inaccurate, resulting in potentially unsafe designs. The objective of this research is to assess the performance of simplified damage-based concrete biaxial models in analyzing and capturing the structural behavior of full-scale RC systems. Damage-based models for concrete require minor input from the analyst, facilitating their use in a design setting, while their explicit, non-conditional convergence formulations allow for non-iterative solutions. This results in damage-based models featuring efficient computational analysis while accounting for complex phenomena such as the capacity to account for stiffness recovery in reversal loading (crack closing) and permanent strains in the concrete. A comparison between analytical and experimental data at both the element- and system-levels is conducted, and a viable damage-based model is proposed for a full-scale structure analysis. The results of the study show that damage-based models are a viable alternative to developing efficient analysis models for elements and whole structures.
Abstract: Significant progress in the finite-element (FE) modeling at the member-level of reinforced-concrete (RC) structures under seismic excitation has been achieved in the past decades; however, reliable and accurate analysis models for full-scale 3D system-level RC structures validated with experimental data are scarce. As the development of a complete ...
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Research/Technical Note
Conformance and Performance Evaluation of Land Use Plan of Yirba Town
Daniel Lirebo Sokido*,
Addisu Sherbeza Woldemariam
Issue:
Volume 12, Issue 4, August 2024
Pages:
108-128
Received:
28 April 2024
Accepted:
15 May 2024
Published:
23 July 2024
Abstract: The purpose of the research is to examine the conformance and performance of land use plan of Yirba town. To get accurate and adequate information on the level of achievement of urban plan, primary and secondary data sources were used with respect to land use categories. Primary data sources such as land inventory and key informants interview were exhaustively employed. Land inventory was undertaken to have firsthand information on the existing situation of general as well as detail land use of the town. Key informants interview were conducted to gather data from experts Yirba municipality, and Sidama Region Urban planning Institute. Secondary data sources such as document reviews of basic plan and strategic Plan of Yirba town, urban development policy and other legal documents were used for investigation purpose. GIS, Microsoft office word, and excel were used to analyze the quantitative and qualitative data. The results of the analysis were presented in the form of maps, graph, chart, and tables. Descriptive and explanatory analysis research designs were employed. The results of analysis elucidates that conformance evaluation has vital contribution to avoid wastage of urban land and the best use of available space. The performance evaluation results make clear the overall achievement of urban plan for the stated town is low. Even though it is overlooked, the conformance evaluation that is conducted prior to the approval of the proposed plan and during implementation is crucial for preventing the wastage of urban land and significantly helps for proper implementation. A full-fledged performance evaluation is recommended before the commencement of new urban plan for the town. Conducting such performance evaluation helps identify the level of success or failure, and the gaps of the prior plan. Since action plans and phasing plans are tools for implementation, they must be developed in tandem with land use plans for the proper execution of urban plans. Urban planning is regarded to be a collaborative field. It necessitates cooperation of numerous teams or experts during the planning and execution stages.
Abstract: The purpose of the research is to examine the conformance and performance of land use plan of Yirba town. To get accurate and adequate information on the level of achievement of urban plan, primary and secondary data sources were used with respect to land use categories. Primary data sources such as land inventory and key informants interview were ...
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