Comparion of seismic response of single-layer reticulated dome under unform and incoherence three-directional excitations

Fan, Feng; Li, Yugang; Zhi, Xu; Li, Lü

doi:10.1007/s13296-014-1216-9

Cited by 7 publications

(2 citation statements)

References 19 publications

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“…For long-span structures, the earthquake at each fulcrum has not only temporal but also spatial variability, which has been confirmed by various strong earthquake observations [10][11][12]. In the code for seismic design of buildings, except for the European code, which considers the spatial variability of earthquakes, other codes adopt uniform excitation.…”

Section: Introductionmentioning

confidence: 82%

Seismic Response of Long-Span Staggered Storey Isolated Structure Under Multi-support Excitation

2022

JPCE

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Purpose: Long-span structures are widely used in various engineering applications. For such structures, earthquakes at each fulcrum exhibit temporal and spatial variations. Therefore, analyzing the multi-support excitation of long-span staggered storey isolated structures is necessary. A finite element model of a long-span staggered storey isolated structure was proposed to investigate their seismic response under multi-support excitation to better understand and analyze its isolated performance. And the model was designed to improve research on the seismic response of different apparent wave velocities under multi-support excitation. Methods: Based on related research, the structural finite element analysis software SAP2000 was used in long-span staggered storey isolated structures. The responses of the structures under multi-support and uniform excitation were compared, and the seismic responses of different apparent wave velocities were compared. Conclusion: A nonlinear time-history response was obtained to evaluate the seismic response of staggered storey isolated structures using various parameters. Different excitation methods and apparent wave velocities help determine the seismic response of the structure, which should be considered in the design.

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Section: Introductionmentioning

confidence: 82%

Seismic Response of Long-Span Staggered Storey Isolated Structure Under Multi-support Excitation

2022

JPCE

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“…Single-layer domes are adopted worldwidely as long-span roofs in recent decades [1][2][3] because of their advantages, such as their good aesthetic appearance, large space coverage capability and sound structural performance. Current research work is mainly focused on the structural response [4][5][6][7][8][9][10], collapse [11][12][13] of the steel structure under different loads through experiment and numerical simulation analysis [14][15][16][17][18], considering stability and buckling [19][20][21][22]. Only few reports have investigated the structural dynamic failure modes [17,19,23,24] and the seismic failure loads when the single-layer reticulated shells are subject to earthquakes.…”

Section: Introductionmentioning

confidence: 99%

Study of Seismic Resistance of Kiewit-8 Dome Considering Key Structural Design Parameters

2019

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A new seismic failure criterion is proposed for the Kiewit-8 (K8) dome subjected to earthquakes based on key structural parameters. Firstly, the K8 dome models were built in the finite-element package ANSYS after considering the key structural design parameters. Secondly, the incremental dynamic analysis was undertaken resulting in a typical structural damage index Ds. These were introduced to undertake the nonlinear dynamic response history analyses at each increased level of seismic records intensity and permitted the calculation of collapse loads of domes. Three hundred three-dimensional seismic records based on the main influential factors of ground motion were selected as input seismic waves. Thirdly, the lognormal distribution was selected to appraise collapse loads to gain the dynamic collapse fragility curves for domes after comparing three maximum likelihoods. Then, the lower bound collapse loads with 95% probability of non-exceedance changing with structural parameters were determined. Finally, relationships between lower bound collapse loads and five key structural parameters were separated out by using numerical matching methods, followed by a new seismic failure criterion for all the relationships including the five key structural parameters and a safety factor of 1.5. The new seismic failure criterion will contribute to the safe design and construction of these excellent space structures worldwide, particularly in the countries which are prone to earthquakes.

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Fragility analysis of a triangular free‐form reinforced concrete shell

Garcia,

Siqueira,

Vieira Junior

et al. 2024

Structural Concrete

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Considering the importance of deepening the knowledge of the structural behavior of free‐form shell structures with a triangular plan, this work presents the results of research on the analysis of seismic vulnerability, verified through linear time‐history analysis (NLTHA), generating fragility curves through PSDM models. The analyzes carried out are based on uncertainties regarding both the mechanical properties of the materials and the geometric characteristics of the structures, as well as the action of seismic events. Real accelerograms, compatible with the elastic response spectra for Lisbon and Ouren, Portugal given by the EC8 standard, are used to consider seismic events. In the analyses, fundamental factors are considered, such as the accumulation of damage and the degradation in the resistance of materials. The structure presents highly ductile behavior in the face of seismic loads, attributed to its rigidity, geometry, lightness, and modal behavior, with participation in the horizontal components of the mass in the first five vibration modes greater than 80% and with minimal influence of the vertical component, characteristics inherent to this type of structure. However, it should be noted that the area close to the support, in the same direction as the ground acceleration, is the most vulnerable. This occurs due to the plastic yielding of the concrete during the earthquake, which promotes the appearance of cracks and compression damage. This is verified for the structure when subjected to earthquakes with PGA in the horizontal direction between 0.01 and 0.8 g. The probability of considerable damage increases with seismic events having PGA greater than 0.6 g, which, in turn, can compromise the stability of the structure. It is, therefore, of great importance to study the seismic behavior of shell structures, especially free‐form shells, considering the variability and uncertainties related to the structural stress arising from the seismic demand.

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Comparion of seismic response of single-layer reticulated dome under unform and incoherence three-directional excitations

Cited by 7 publications

References 19 publications

Seismic Response of Long-Span Staggered Storey Isolated Structure Under Multi-support Excitation

Seismic Response of Long-Span Staggered Storey Isolated Structure Under Multi-support Excitation

Study of Seismic Resistance of Kiewit-8 Dome Considering Key Structural Design Parameters

Fragility analysis of a triangular free‐form reinforced concrete shell

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