Effects of brace-to-chord angle on capacity of multi-planar CHS X-joints under out-of-plane bending moments

Liu, Chengqing; Zhao, Bida; Yang, Juan; Qian, Yi; Yao, Zeyang; Wu, Junjie

doi:10.1016/j.engstruct.2020.110434

Cited by 17 publications

(8 citation statements)

References 26 publications

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“…Summarizing this last part, the model according to Equation ( 14) is selected as reference for comparison to the others because it was shown that it amounts to a reparametrization of the one in Equation (2), which happens to be the one used as the base in Mexico's regulations (Manual de proyecto geométrico de carreteras 2018-Handbook of geometric projects in highways 2018) [18]. On the other hand, the percentages of relative error differences among safe (i.e., non slippage) highway design speeds generated by models considered with respect to the one generated by Equation ( 14) are proposed as suitable comparison metrics between them.…”

Section: Highway Vehicle Dynamics Studied By Cylindrical-polar Coordi...mentioning

confidence: 99%

“…Among them are studies on the structural resistance of reinforced concrete columns and circular hollow section (CHS) joints under bending moments, in which neural network modeling and BP-Garson algorithmization are used to predict and analyze critical structural behaviors, which clearly is directly applicable to highway design and its operational safety and integrity [1]. On the other hand, studies in subjects such as the analysis of the effects of the brace-to-chord angle on the capacity of multi-planar CHS X-joints under out-of-plane bending moments illustrate how spatial and angular factors, modeled through finite element analysis, influence structural capacity, which is critical in highway design [2].…”

Section: Introduction and Antecedentsmentioning

confidence: 99%

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Analyzing the Impact of Geometrophysical Modeling on Highway Design Speeds: A Comparative Study for Mexico’s Case

Anaya Rivera,

Isaza,

Ramirez-Gutierrez

et al. 2024

Applied Sciences

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This manuscript presents an examination of the impact of geometrical and physical parameters on highway design speeds, critical for traffic safety and efficiency. Originating from a classical dynamics discussion in an undergraduate automotive technology engineering class, an exploration of the consequences of different geometrophysical considerations on a vehicle’s dynamics over pavement surfaces is developed. Considering various analytical models, an assessment of their principles and the significance of geometric and physical concepts involved in the problem is made, such as plane of motion and trajectory curvature radius, on safe (non slippage) operational speeds. The subsequent comparative study shows that one of the most accepted models in highway design regulations in México, when used as reference, yields percentage error differences respect to others of 0≲%EMax≲5, as well as a consistent trend for relatively underestimating safe highway operational speeds. A discussion of the immediate implications of these findings, emphasizing the necessity of experimental studies to validate theoretical predictions, is presented. This work contributes to the field by providing a detailed comparison of analytical models under a general applied science perspective, suggesting modifications to current highway design practices in México based on geometrophysical insights. In summary, this work’s main aim is to shed light on the intricacies of determining safe design speeds from an applied sciences point of view, while also calling for a reevaluation of the existing guidelines to enhance highway design and safety.

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Section: Highway Vehicle Dynamics Studied By Cylindrical-polar Coordi...mentioning

confidence: 99%

Section: Introduction and Antecedentsmentioning

confidence: 99%

Analyzing the Impact of Geometrophysical Modeling on Highway Design Speeds: A Comparative Study for Mexico’s Case

Anaya Rivera,

Isaza,

Ramirez-Gutierrez

et al. 2024

Applied Sciences

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show abstract

“…[40,41] When designing and calculating steel welded joints and welded components, appropriate methods must be adopted to consider the strength reduction of weld line and base metal welded heat affected zone. [42,43 ] The Equivalent Section Method is usually used to consider the degree of bearing capacity reduction. Therefore, the concept of strength conversion region is introduced.…”

Section: Joint Damage Definition Of Diagrid Tube Structurementioning

confidence: 99%

Robustness analysis of vertical resistance to progressive collapse of diagrid structures in tall buildings

Liu

Fang

2020

Structural Design Tall Build

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In order to investigate the vertical resistance to progressive collapse and the evolution of its robustness in the process of loading, a quantitative method of the robustness index of diagrid structure is established based on the mechanical properties of the components and the vertical bearing capacity of the structure. A scale experiment model of diagrid tube structure is established in laboratory which verified the availability of the proposed robustness quantification method. Results demonstrated that, the axial force of inclined column is pressure, and the axial force of ring beam is tension under vertical load. The ring beam is the main restraint to the side bulge of the diagrid structure. The welded strength of the inclined column have great influence on the vertical bearing capacity, so it is necessary to consider the reduction of the strength of welded joint. The influence of the welding line of the joint can lead to the plastic stage of the local components of the structure, which makes the structural robustness worse. In addition, the experimental study and numerical simulation results verify that the proposed method of robustness coefficient quantification for diagrid tube structure can accurately and reasonably evaluate the resistance of vertical progressive collapse performance.

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“…At near-fault conditions, the forward directivity of earthquake ground motion often has a huge adverse effect on the engineering structure. The near-fault earthquake ground motion usually demonstrate long period and high amplitude velocity pulse, while the isolation structure has relatively large period, so the detriment of near-fault earthquake ground motion on the isolation structure is more significant [17][18][19], especially the large displacement of the isolation structure under the action of near-fault earthquake ground motion [20]. Therefore, the influence of near-fault earthquake ground motion should be considered in the practical application of isolated structure.…”

Section: Introductionmentioning

confidence: 99%

Seismic Fragility Analysis of Base Isolated Structure Subjected to Near-fault Ground Motions

Liu

Fang

Yan

2021

Period. Polytech. Civil Eng.

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In order to better evaluate the performance of the base isolated structure under the near-fault earthquakes, this paper takes into consideration an existing engineering case study in China as the prototype, and uses OpenSEES platform to establish the nonlinear finite element model of the base isolated structure. The nonlinear response of the isolated structure under the near-fault earthquake is analyzed. The incremental dynamic analysis (IDA) method is used to calculate the damage probability of the structure under the near-fault earthquake, and the fragility curve of the base isolated structure is established. The fragility equation is obtained by nonlinear regression, and the error of fragility equation is analyzed. The results show that the maximum value of the inter-story drift of the upper structure under the action of near-fault earthquake is significantly greater than that under the action of far-fault earthquake. With the increase of seismic intensity, the damage probability of base isolated structure increases nonlinearly, and the maximum response value of horizontal displacement of bearing and inter-story drift of superstructure increases generally. In addition, the exceeding probability of the fragility curve based on PSDA is greater than that based on EDP criterion. When the sample points of the two methods are the same, the exceeding probability points calculated based on PSDA can be regarded as accurate values. The fragility curve based on PSDA may overestimate the exceeding probability to some extent, and the overestimation may be enlarged with the increase of failure stage.

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Effects of brace-to-chord angle on capacity of multi-planar CHS X-joints under out-of-plane bending moments

Cited by 17 publications

References 26 publications

Analyzing the Impact of Geometrophysical Modeling on Highway Design Speeds: A Comparative Study for Mexico’s Case

Analyzing the Impact of Geometrophysical Modeling on Highway Design Speeds: A Comparative Study for Mexico’s Case

Robustness analysis of vertical resistance to progressive collapse of diagrid structures in tall buildings

Seismic Fragility Analysis of Base Isolated Structure Subjected to Near-fault Ground Motions

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