Detail design, building and commissioning of tall building structural models for experimental shaking table tests

Tabatabaiefar, Hamid Reza; Mansoury, Bita

doi:10.1002/tal.1262

Cited by 40 publications

(25 citation statements)

References 25 publications

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“…Based on similarity law, the hybrid structure, whose main materials are microconcrete with cubic compressive strength of 8.1 MPa, 14 and 20 iron wires, and red copper, is designed according to seismic intensity fortification 7 . The 7° frequent/basic/rare earthquake means that the exceeding probability in the design period of 50 years equals to 63%/10%/2–3%, respectively.…”

Section: Shaking Table Testmentioning

confidence: 99%

Shaking table test and numerical simulation on a vertical hybrid structure under seismic excitation

Lü

Zhou

2018

Structural Design Tall Build

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A shaking table test of a 12-story steel/reinforced concrete (S/RC) frame, which is composed of a 4-story steel frame in the higher part, a 1-story S/RC frame as a transition story in the middle part, and a 7-story reinforced concrete (RC) frame in the lower part of the model, has been conducted, and its results are compared with those of a standard 12-story RC frame to evaluate seismic performance of this S/RC frame.The numerical simulation on such hybrid frame structure has been performed and validated by the above experimental results. It is found that irregular lateral-stiffness distribution along structural height will not only increase rotation at the joint of boundary between transition story and steel frame or concrete frame but also enlarge rotation at such joint and lead to more obvious rigid deformation in steel frame of S/ RC frame, which will undoubtedly intensify bending failure. Meanwhile, acceleration response of the upper steel frame will reach its peak when characteristic site period is near the counterpart of the upper steel frame. Further, the maximum interstory drift under frequent earthquake excitation is at the lower substructure, namely, the RC frame, but this is not the case in rare earthquake situation. When it comes to determining damping ratio for vertical hybrid structure, a general method for engineering, which takes concrete and steel damping ratio for the whole structure analysis and then gets envelopes of these results for design, may yield conservative results. Meanwhile, such method may underestimate responses near the transition story. KEYWORDS numerical simulation, reinforced concrete frame, seismic performance, shaking table test, steel frame, vertical hybrid frame | INTRODUCTIONA steel-concrete vertical hybrid structure is composed of an upside steel structure and a lower concrete structure that are connected in series.This kind of structure with lateral stiffness varying vertically can meet demands from structural deformation and make spatial arrangement in the upper steel structure more flexible. By virtue of more convenience for designing big rooms in upper floors, this kind of vertical hybrid structure system has already been successfully applied in skyscrapers such as Shanghai World Financial Center, Wuhan Security Tower, in China, and Century mansion, Yokohama landmark tower, in Japan. [1,2] Researches about vertical hybrid structure are not sufficient enough, though this kind of structure has already been put into use in tall buildings and even skyscrapers. Its mass, stiffness, and damping behavior between the substructures are quite different. [3] Meanwhile, the damping matrix and modal damping are no longer suitable for such hybrid structures. Consequently, for vertical hybrid structure, it becomes rather difficult to estimate its structural deformation, yielding mechanism, and seismic performance through general computational analysis. Moreover, the key point of studying on seismic performance of hybrid structure is to determine an appropriate damping ratio for str...

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Section: Shaking Table Testmentioning

confidence: 99%

Shaking table test and numerical simulation on a vertical hybrid structure under seismic excitation

Lü

Zhou

2018

Structural Design Tall Build

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“…Therefore, there is a strong engineering motivation for a site-dependent dynamic response analysis for many foundations in order to determine the free-field earthquake motions. Recent studies [1][2][3][4] have revealed that the performance level of steel unbraced frames is very sensitive to lateral deformations and drifts. Performance levels describe the states of structures after being subjected to a certain hazard level and are classified as: fully operational, operational, life safe, near collapse, or collapse [5].…”

Section: Introductionmentioning

confidence: 99%

Dynamic behaviour of unbraced steel frames resting on soft ground

Far

2019

Steel Construction

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Many recent earthquakes clearly illustrate the importance of local ground properties for the dynamic response of structures. The dynamic response of an engineering structure is influenced by the medium on which it is founded. On solid rock, a fixed‐base structural response occurs which can be evaluated by subjecting the foundation to the free‐field ground motion occurring in the absence of the structure. However, on deformable ground, a feedback loop exists. In other words, when a feedback loop exists, the structure responds to the dynamics of the soil, while the soil also responds to the dynamics of the structure. Structural response is then governed by the interplay between the characteristics of the ground, the structure and the input motion. This study involved a numerical investigation of the dynamic behaviour of unbraced steel frames resting on soft ground. Two types of mid‐rise unbraced steel frame, including 5‐ and 15‐storey buildings on a soft soil deposit, were selected and analysed under the influence of three different earthquake acceleration records. The above‐mentioned frames were analysed under two different boundary conditions: i) fixed‐base (no soil‐structure interaction) and ii) flexible‐base (considering soil‐structure interaction). The results of the analyses in terms of structural forces and lateral displacements for the above‐mentioned boundary conditions are compared and discussed.

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“…Shaking table test is an effective approach to investigate the seismic behavior and failure mechanism of structures . It is widely used for the irregular structures, such as complex supertall buildings and multitower connected structures, which are not currently included in the design codes.…”

Section: Introductionmentioning

confidence: 99%

Shaking table test and numerical analysis of an asymmetrical twin‐tower super high‐rise building connected with long‐span steel truss

Guo

Zhai

Wang

et al. 2019

Structural Design Tall Build

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Summary The asymmetrical high‐rise building investigated in this paper is composed of a 299.1‐m‐high tower and a 235.2‐m‐high tower, which are diagonally and rigidly connected by two steel truss systems with the maximum span of 65.43 m. Given the great structural irregularities and complexities, the structural seismic performance is necessary to be investigated. A shaking table test of a 1/45 scaled model is conducted in this study, by which the structural damage pattern and dynamic responses are analyzed. The results show that the connecting trusses and rigid connection joints behave well during strong seismic excitations. The damages concentrate on the connecting floors, and the whole structural damage is slight. Most of the lateral resistance components remain elastic. The structure presents high seismic resistance against strong ground motions. Subsequently, a three‐dimensional finite element model of prototype structure is established and validated by the experimental results. The analyses indicate that performance of the connecting trusses is capable of coordinating translational and torsional deformation of the two towers and making them resist lateral seismic force together even subjected to maximum considered earthquakes. And this performance is still reliable although the high torsional modes are triggered.

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Detail design, building and commissioning of tall building structural models for experimental shaking table tests

Cited by 40 publications

References 25 publications

Shaking table test and numerical simulation on a vertical hybrid structure under seismic excitation

Shaking table test and numerical simulation on a vertical hybrid structure under seismic excitation

Dynamic behaviour of unbraced steel frames resting on soft ground

Shaking table test and numerical analysis of an asymmetrical twin‐tower super high‐rise building connected with long‐span steel truss

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