Hierarchical Structures for a Robustness-Oriented Capacity Design

Masoero, Enrico; Wittel, Falk K.; Herrmann, Hans J.; Chiaia, Bernardino

doi:10.1061/(asce)em.1943-7889.0000437

Cited by 17 publications

(13 citation statements)

References 13 publications

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“…Here, instead, CASCO is validated against previous, fully non-linear, dynamic simulations of collapse of 2D frames made of reinforced concrete [23]. The simulations from the literature were themselves validated against experiments of dynamic collapse of reinforced concrete beams, mimicking sudden column removal of accidental origin [22].…”

Section: Casco Has Been Validated Against Various Examples With Analytical Solution Shown In the Supplemental Materialmentioning

confidence: 99%

CASCO: a simulator of load paths in 2D frames during progressive collapse

Masoero

2020

SN Appl. Sci.

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Modern structural design software can simulate complex collapse dynamics, but the main physical processes driving collapse propagation are often hidden among structure-specific details. As a result, it is still unclear which structural geometries and material properties should be preferred when approaching the design of a damage-tolerant structure. This manuscript presents a new approach to explore the relationships between structural geometry, local mechanical properties, and collapse propagation. The insight comes from a unique ability to trace the evolution of load paths during collapse, achieved by combining energy conservation with local mechanisms of plastic failure and a few simplifying assumptions. The method is implemented in a new simulator of collapse of 2D frames, called CASCO and programmed in MATLAB. Simulation results for reinforced concrete frames predict collapse loads and mechanisms in agreement with fully non-linear, dynamic simulations, while also providing a graphical description of the evolving structural topology during collapse. A first application of CASCO to mechanically homogeneous and heterogeneous frames, indicates certain evolutions in number and density of load paths during collapse that may be targetted to improve collapse resistance.

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Section: Casco Has Been Validated Against Various Examples With Analytical Solution Shown In the Supplemental Materialmentioning

confidence: 99%

CASCO: a simulator of load paths in 2D frames during progressive collapse

Masoero

2020

SN Appl. Sci.

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“…Thus, a quantitative evaluation indicator is needed to conduct robustness optimization design and form design specifications. Meantime, the major research targets of structural robustness mainly involve masonry structure [13], frame structure [14], frame-core tube structure [15], bridge structure [16], underground structure [17], etc.…”

Section: Introductionmentioning

confidence: 99%

Section Optimization Design of a Flexible Cable-Bar Tensile Structure Based on Robustness

et al. 2021

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As the current literature lacks effective nonlinear robustness evaluation method and optimal design theory of the structural robustness for flexible cable-bar tensile structure, this paper aimed to conduct further studies. Based on the theory, a fundamental robustness analysis method and a detailed calculation way through the combination of induction of performance criterion and random theory for nonlinear structural robustness quantitative evaluation method were proposed. Following this, a real Geiger cable dome structure was studied as its research object, and the influences of structural robustness of simultaneous changes of all elements section and changes of every kind of element section were analysed, respectively. Finally, the genetic algorithm was applied through MATLAB and ANSYS software to achieve optimal section layout, with the goal of minimizing structural quality on the condition that the structural robustness indicator keep less than that of the initial structure. The result revealed that the increase of the section of elements can effectively enhance structural robustness and the section changes of various elements showed different sensitivities to the influence of structural robustness. Meanwhile, structural quality can be effectively reduced by optimizing measures such as increasing the section of elements with significant effect on structural robustness and reducing the section of elements with minor effects on structural robustness, while the structural robustness indicator keeps less than that of the initial structure. The optimization reveals that quality was reduced by 42.5% in this paper.

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“…Generally, there are two concepts of robust design mainly involved in the current studies. One concept is that robustness refers to structural redundancy and integral capacity under accidental actions, e.g., earthquake, impacts (Anitori et al 2013;Masoero et al 2010). Another concept is that robustness refers to invariable performance under normal variation of parameters (Sandgren and Cameron 2002;Oh et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Robustness of Load and Resistance Design Factors for RC Columns with Wind-Dominated Combination Considering Random Eccentricity

et al. 2017

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Based on the capacity models in the 2008 edition of the American Concrete Institute (ACI) Standard Building Code Requirements for Structural Concrete, a more realistic limit state function is built for reinforced concrete (RC) columns with random eccentricity. Then, we discuss the applicability of the load and resistance factors in the code, which is mainly based on reliability calibrations with a fixed eccentricity criterion. Taking the wind dominated combination as an example, representative cases are established by selecting typical values of four related design parameters. Using the load and resistance models in previous reliability calibration of the code, the probabilistic distribution of eccentricity and the statistics of column resistance are analyzed for each case. The analysis indicates that the possible eccentricity shows a scatter over a large range, and the probabilistic model of column resistance varies from case to case, which is largely different from the constant resistance model assumed in previous reliability calibration. With Monte Carlo simulation (MCS), the column reliability is calculated and obtained for different cases. The results

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Hierarchical Structures for a Robustness-Oriented Capacity Design

Cited by 17 publications

References 13 publications

CASCO: a simulator of load paths in 2D frames during progressive collapse

CASCO: a simulator of load paths in 2D frames during progressive collapse

Section Optimization Design of a Flexible Cable-Bar Tensile Structure Based on Robustness

Robustness of Load and Resistance Design Factors for RC Columns with Wind-Dominated Combination Considering Random Eccentricity

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