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<p>The diagrid structural system is an attractive system because of aesthetics and structural aspects. Performance-based design is an inclusive approach whose purpose is to satisfy specified performance requirements when structures are subjected to specified seismic hazard levels. Because of worries about the sustainability of civil infrastructure, life cycle cost analysis of structures has prominence in recent years; however, this subject is still relatively new. This study integrates performance-based design with life cycle cost analysis to evaluate the seismic performance and economic efficiency of steel diagrid systems, a novel approach in structural engineering. Weight, story drift, story acceleration, number of stories, and diagonal section type at various damage states are studied. Modeling and numerical analysis are carried out using the OpenSees program. Nonlinear dynamic analysis is performed with 22 pairs of normalized far field earthquake recordings to obtain the fragility curve for calculating life cycle cost. The results show that round hollow sections significantly outperform W-sections in terms of seismic performance, with higher collapse capacities and reduced fragility uncertainties. For instance, in 10-story models, the median collapse capacity increased by over 100%, and for 15-story models, it improved by 85.3% when W-sections were replaced with round hollow sections. Fragility curves reveal that round hollow sections reduce the probability of severe damage across all damage states, demonstrating superior reliability and reduced uncertainty. LCC analysis highlights models 3 and 8 as the most cost-effective designs for 10- and 15-story buildings, respectively. These models achieved optimal seismic performance while maintaining relatively low structural weights, demonstrating that cost-efficient and high-performing designs are achievable. The findings indicate that the prescriptive approach given by current codes is insufficient for steel buildings with diagrid structural systems. Furthermore, life cycle cost analysis enables engineers to propose appropriate designs that meet the needs of stakeholders.</p>

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Seismic Design of Mid-Rise Steel Diagrid Structures Considering Life Cycle Cost

  • 期刊论文

  • 发表日期：

    2025年4月16日

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  • Ehsan Ghorreshi,
  • Mohammad Reza Mansoori,
  • Mir Hamid Hosseini

摘要

The diagrid structural system is an attractive system because of aesthetics and structural aspects. Performance-based design is an inclusive approach whose purpose is to satisfy specified performance requirements when structures are subjected to specified seismic hazard levels. Because of worries about the sustainability of civil infrastructure, life cycle cost analysis of structures has prominence in recent years; however, this subject is still relatively new. This study integrates performance-based design with life cycle cost analysis to evaluate the seismic performance and economic efficiency of steel diagrid systems, a novel approach in structural engineering. Weight, story drift, story acceleration, number of stories, and diagonal section type at various damage states are studied. Modeling and numerical analysis are carried out using the OpenSees program. Nonlinear dynamic analysis is performed with 22 pairs of normalized far field earthquake recordings to obtain the fragility curve for calculating life cycle cost. The results show that round hollow sections significantly outperform W-sections in terms of seismic performance, with higher collapse capacities and reduced fragility uncertainties. For instance, in 10-story models, the median collapse capacity increased by over 100%, and for 15-story models, it improved by 85.3% when W-sections were replaced with round hollow sections. Fragility curves reveal that round hollow sections reduce the probability of severe damage across all damage states, demonstrating superior reliability and reduced uncertainty. LCC analysis highlights models 3 and 8 as the most cost-effective designs for 10- and 15-story buildings, respectively. These models achieved optimal seismic performance while maintaining relatively low structural weights, demonstrating that cost-efficient and high-performing designs are achievable. The findings indicate that the prescriptive approach given by current codes is insufficient for steel buildings with diagrid structural systems. Furthermore, life cycle cost analysis enables engineers to propose appropriate designs that meet the needs of stakeholders.