Shaking table model tests on a complex high‐rise building with two towers of different height connected by trusses

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.

Section: Experimental Results and Analysissupporting

confidence: 59%

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

“…However, a twin‐tower building presents great challenges on structural seismic designs. A higher internal force in the corridors under an earthquake can occur, and the constructional details are very difficult to address if the sky corridor is rigidly connected to the towers . On the other hand, a flexible connection (passive control devices) can overcome these disadvantages to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Mechanism and optimum design of shared tuned mass damper for twin‐tower structures connected at the top by an isolated corridor

Lyu

Liu

Wang

et al. 2020

Summary The concept of shared tuned mass damper (STMD) for twin towers linked by a sky corridor using flexible joints is proposed in this paper. The analytical expressions of the transform functions and random earthquake responses of the flexibly connected structures are derived using a three‐degrees‐of‐freedom model system. The seismic reduction mechanism of the STMD is revealed using comparative analysis between the structures with STMD and those connected using a viscoelastic damper. The effect of the nondimensional parameters such as the frequency ratio of the two primary structures, mass ratio, tuning frequency ratio of the corridor, and damping ratio of the passive control devices on the structural seismic response is investigated. Optimum parametric analysis is performed using the principle of minimizing the displacements of both towers, and the optimal parameter formulas are established. Numerical analysis is conducted to verify the control effectiveness of the connected multi‐degree‐of‐freedom system subjected to the El Centro earthquake ground motion. The results show that the earthquake responses of the towers can be effectively reduced if the parameters of the flexible connecting elements are appropriately selected for a certain corridor mass. Moreover, a remarkable seismic reduction effect can be achieved if the towers have similar dynamic properties.

“…Lu et al . () carried out shaking table model tests on a complex high‐rise building with two towers of different heights connected by trusses. Besides theoretical and experimental investigations, with the development of software and personal computer, nonlinear analysis for complex irregular buildings has gradually come to maturity.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear time history analysis of China Pavilion for Expo 2010 Shanghai China

Sun

et al. 2013

Self Cite

SUMMARYThe peculiar building style and special structural system of the National Hall of China Pavilion for Expo 2010 Shanghai is a long‐span and large cantilevered steel–concrete hybrid structure with a shape of an inverted trapezoid in elevation and local discontinuity of floor slabs in plan for esthetic and functional considerations. Because of these characteristics, the building is classified as an irregular and complex structure. To investigate the seismic behavior of the structure, a refined finite element model was established by using NosaCAD. To simulate the nonlinear behavior of the members, the fiber section model was chosen for compression‐flexure frame members, and nonlinear flat shell element was chosen for tube wall. Nonlinear analysis was carried out to study the seismic behavior of the structure under the minor and major earthquakes at the level of intensity 7. With the analysis, the deformations, internal forces and damage states of the structure were investigated. Analysis results show that there is no damage on structure under minor earthquake, the structural system has sufficient capacity and ductility to resist major earthquake, and seismic performance objective of no damage under minor earthquake and no collapse under major earthquake can be reached. The deformation of the structure is less than the limit of the Chinese code. The order and distribution of damages on components of the tubes are reasonable, which can dissipate some dynamic energy. Finally, weak points were identified, and some corresponding suggestions were put forward to improve the overall seismic performance of this structure. Copyright © 2013 John Wiley & Sons, Ltd.