Super High-rise Structures Research Articles

Research on the influence of frame-core tube stiffness ratio on dynamic characteristics of Super high-rise buildings

The frame-core tube hybrid structure is an important high-rise building structure system which is widely used in the world at present. The stiffness ratio of frame to core tube affects the dynamic characteristics of the structure. In this paper, nine models of concrete-filled steel tubular frame-concrete core tube super high-rise hybrid structure with different stiffness ratios are analyzed by subspace iteration method, and the analysis of the acceleration and displacement response spectrum value of each vibration mode under frequent earthquakes are carried out. The results show that the stiffness ratio has different effects on different modes, the fundamental frequency, natural period, acceleration and displacement response of the structure of the first mode increase with the stiffness ratio increasing, and it is feasible and significant to interpret the seismic response of structures from studying the dynamic characteristics of seismic waves and structures.

Analysis of performance-based seismic design method for super high-rise frame-supported shear wall structure

In this paper, the advanced performance-based seismic theory is introduced, and combining with the seismic codes and high-rise building codes, a performance-based seismic design approach is established for high-rise frame-supported shear wall structure. Firstly, the performance objective is determined, and then calculation under frequent earthquakes, fortification earthquake and rare earthquake is carried out, finally, the performance analysis is carried out to see whether it achieves the predetermined performance objective. Then taking a high-rise frame-supported shear wall structure as an example, based on the performance-based seismic design method, YJK and ETABS software were used to carry out the performance-based seismic design under the action of frequent earthquakes and fortification earthquakes. Next, Perform3D software was used to analyze dynamic elastic-plastic time-history analysis under the action of rare earthquakes. In addition, the analysis of transfer component performance were conducted for quantitative control of the bearing capacity and deformation of reinforced concrete structures and structural members. The calculation results show that relevant parameters can meet code requirements and the seismic performance of the whole structure and components can reach the expected performance objectives. Finally, we present a summary of the proposed seismic strengthening measures and make suggestions for the whole structures, by which the structure can meet the seismic fortification code requirements and be safe and reliable.

Dynamic monitoring of a super high-rise structure based on GNSS-RTK technique combining CEEMDAN and wavelet threshold analysis

To capture the dynamic characteristics of a super high-rise structure under construction (i.e. Tianjin 117 Tower), multi-constellation GNSS-RTK (global navigation satellite system – real time kinematic) sensors are employed to derive the displacement information of the structure. A combined approach (CEEMDAN–WT) of complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) and wavelet threshold (WT) technique is put forward to weaken the influence of background noise of sensors. For the sake of testing the effect of noise reduction via employing CEEMDAN–WT, a nonlinear signal with additive noise is introduced. Subsequently, the natural frequencies and the corresponding damping ratios of the structure are extracted based on the fast Fourier transform (FFT) and random decrement technique. In addition, the finite element model (FEM) of the structure is built to forecast the natural frequencies via modal analysis. The results show that: (1) The dynamic displacement information of super high-rise structures can be effectively determined based on GNSS-RTK technique; (2) The presented CEEMDAN–WT approach outperforms the single CEEMDAN and WT approaches; (3) The result obtained via the field measurement coincides with the FEM.

Investigation of the Dynamic Behavior of a Super High-rise Structure using RTK-GNSS Technique

Super high-rise structures have a significant deformation under ambient excitations such as earthquake and wind, which may lead to structural instability and even damage. To capture the dynamic characteristics of a super high-rise structure under construction (i.e., Tianjin 117 tower), Real Time Kinematic - Global Navigation Satellite Systems (RTK-GNSS) sensors are employed to derive the horizontal displacement of the structure. Considering the defects in measurement accuracy of RTK-GNSS sensors, a Type 1 Chebyshev high-pass digital filter is firstly employed and thus the output results are smoothed. Subsequently, based on the smoothed signals, the natural frequencies and the corresponding damping ratios are extracted via FFT (Fast Fourier Transform) and RDT-LDM (random decrement technique combined with logarithmic decrement method). It is found that the results from the field measurement coincide with the numerical simulation. Finally, the structural parameters are successfully obtained and illustrated graphically.

Analysis of the Key and Difficult Points in the Engineering Construction Technology of the Steel Structures of a Super High-rise Building

In recent years, with the rapid development of the economy of China, the traditional building structure has not been able to meet the current people’s demands and the super high-rise building has become a symbol of a city. In the current period, the research on the super high-rise building in the architectural industry of China is late and the technical blanks exist in some construction difficulties in the super high-rise steel structures. Based on the above, a brief analysis and discussion on the difficult construction technology in the steel structures of a super high-rise building and some measures are presented for reference of the relevant personnel in this paper.

Influence of Seismic Ground Motions with Different Frequency on Super High-rise Building Structural Seismic Response

Large differences of seismic response may exist when the structure subject different frequency seismic ground motions, and the low frequency and the high frequency may control the seismic response of different stage for super tall structure. Three groups earthquake waves which have different frequency were selected as input for time history analysis of a designed super tall building structural model. The analysis software is PERFORM-3D. The results show that the gap is very large in displacement, base shear and the maximum story drift ratio. Meanwhile, the maximum vertex displacement of structure lagging behind the maximum base shear. Nevertheless, there are a lot research shows that the transient response of high frequency seismic ground motions may induce the bigger displacement than the resonance. But the mode decomposition response spectrum method could not make a reasonable estimate on the seismic response characteristic of super high-rise structure. Super high-rise building structures have their own unique response characteristics in different frequency component ground motions, so needing to consider the ground motion with different frequencies when choose a wave for time history analysis.

Analysis on the Holistic Resistant Behavior of Super High-Rise Concrete Structure Affected by the Concrete Strength of the Core of the Joints

In the construction process of super high-rise structures, in order to simplify the construction process and ensure the construction quality, the construction team always make the concrete of joint core use the same strength grade with beams and plates, and pouring with them together. So that the concrete strength of joint core fail to meet the design requirement, whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. In this paper, the finite element model of a super high-rise structure was established by MIDAS/GEN software, the holistic resistant behavior of the structure under the action of frequent earthquake was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.

Wind-Induced Vibration Control and Analysis of Super High-Rise Structure Using Viscous Damping Walls

The wind-induced vibration control and analysis of a super high-rise structure located in the area of strong typhoon with viscous damping walls is introduced. Mechanical properties and design method of viscous damping wall are described, and then the arrangement scheme is put forward. The performances of structure with and without viscous damping walls under the condition of basic wind strength encountered once for 10 years are investigated in detail. The results show that the control scheme can dissipate energy of wind-induced vibration, attenuate structural dynamic response and reduce the mutation of acceleration along height direction effectively. The maximum peak acceleration can be reduced by 23.5% to 0.241m/s2, which meets 0.25m/s2 limit value stated by Technical specification for concrete structures of tall building. Therefore, the arrangement scheme is feasible and effective to control wind-induced vibration and improve structural safety and comfort.

Analysis of the Impact of Concrete Compressive Strength Reduction in Joint Core Area on Super High-Rise Structures

t is focused on a super high-rise building structure, of which the concrete compressive strength is reduced in joint core. The whole structure is calculated with program SATWE. Based on this calculation, integral stress analysis by MIDAS when concrete strength is reduced in joint core area and nonlinear finite element analysis by ANSYS on the joints of the worst cross-sections in the whole structure are developed. Thus the adverse effect of reduced concrete strength in joint core area on super high-rise structures is found out.

Influence of Concrete Strength of the Core of the Joints on the Holistic Resistant Behavior of Super High-Rise Structure

In the construction process of the super high-rise concrete structure, it’s easy to be happened that the concrete strength of joints can’t meet design requirements. Some finite element models of a super high-rise building were established by MIDAS in the paper, which were used to analyze the influence of concrete strength of the core of the joints on the holistic resistant behavior. The study may provide the basis for solving the construction quality problems of the core area of joints

Dynamic response characteristics of super high-rise buildings subjected to long-period ground motions

Spectrum characteristics of different types of seismic waves and dynamic response characteristics of super high-rise building structures under long-period ground motions were comparatively analyzed. First, the ground response wave (named LS-R wave) of a soft soil site with deep deposit, taking long-period bedrock seismic record as input, was calculated by wave propagation method. After that, a TOMAKOMAI station long-period seismic record from the Tokachi-Oki earthquake and conventional El-Centro wave were also chosen. Spectrum characteristics of these waves were analyzed and compared. Then, a series of shaking table tests were performed on a 1:50 scale super high-rise structural model under these seismic waves. Furthermore, numerical simulation of the prototype structure under these excitations was conducted, and structure damages under different intensive ground motions were discussed. The results show that: 1) Spectrum characteristics of ground response wave are significantly influenced by soft soil site with deep deposit, and the predominant period has an increasing trend. 2) The maximum acceleration amplification factor of the structure under the TOM wave is two times that under the El-Centro wave; while the maximum displacement response of the structure under the TOM wave is 4.4 times that under the El-Centro wave. Long-period ground motions show greater influences on displacement responses than acceleration responses for super high-rise building structures. 3) Most inelastic damage occurs at the upper 1/3 part of the super high-rise building when subjected to long-period ground motions.

BP-PSO-based intelligent case retrieval method for high-rise structural form selection

Modern architectures are developing in the direction of tall buildings and complex structures, and the theoretical analysis and the design experience have seriously lagged behind the construction of super high-rise structures. Structural form selection, especially the case based reasoning (CBR) based structural form selection, is a promising tool for the construction of high-rise structures. In view of the limit of cognitive ability of domain experts, a BP (back propagation)-PSO (particle swarm optimization)-based intelligence case retrieval method for high-rise structural form selection is proposed. The CBR-based case retrieval method and the construction of the BP-PSO neutral network are introduced. And then the BP-PSO-based case retrieval method is validated by some engineering cases. The results of training and prediction indicate that the proposed method has good ability to retrieve the cases of high-rise structures.

超超高層構造物施工時の強風対策

超超高層構造物施工時の強風対策

Analysis on the Holistic Resistant Behavior of Super High-Rise Structure Affected by the Concrete Strength of the Core of the Joints

There are some disadvantages in the concrete pouring method of column beam joints of super high-rise structures. If the concrete of joint core use the same strength grade with beams and plates, and pouring with them together, the construction process will be simplified and the construction quality will be easier to ensure. But the concrete strength of joint core is reduced, so whether the resistant behavior of the structure can be able to meet the design requirements is the key problem we focus on. The finite element model of a super high-rise structure was established by MIDAS software, the holistic resistant behavior of the structure was analyzed to study the effect of joint core concrete strength on the whole structure. The study provides the basis for further exploring a more reasonable pouring method of the concrete of the joints.

Construction Technology of Concrete Filled Steel Tubular in Shenyang Wanxin Building

Concrete filled steel tube is widely used in super high-rise steel structure, but there are many problem in the construction of concrete filled steel tube. With the construction of Wanxin building as an example, this paper described the selection of the construction program, and analyzed the disadvantages in construction such as the difficulties of concrete pumping and the problems of pipe blockage, pipe explosion and concrete curing during the process of construction. Based on structural characteristics and construction difficulties, the key technique of steel tube concrete construction are introduced in detail. It can provide significant reference and guide for super high-rise building construction.

Influences of Beam Type Strengthened Storey on Horizontal Displacement in Super High-Rise Structure

The mechanics principle of setting strengthened storey to control the horizontal displacement in super high-rise structure was analyzed, several super high-rise frame tube structure models were established and the maximum peak displacement as well as storey displacement of the structure under the horizontal earthquake load were analyzed via the finite element program; Utilizing controlling structural horizontal displacement as a judge objective, the appropriate setting number of strengthened storey and optimization location were obtained; eventually, the methods on improving the lateral stiffness via setting beam type strengthened storey in super high-rise frame tube structure were put forward. The obtained conclusions are capable to be a reference for designers.

Influences of Beam Type Strengthened Storey on Horizontal Displacement in Super High-Rise Structure

The mechanics principle of setting strengthened storey to control the horizontal displacement in super high-rise structure was analyzed, several super high-rise frame tube structure models were established and the maximum peak displacement as well as storey displacement of the structure under the horizontal earthquake load were analyzed via the finite element program; Utilizing controlling structural horizontal displacement as a judge objective, the appropriate setting number of strengthened storey and optimization location were obtained; eventually, the methods on improving the lateral stiffness via setting beam type strengthened storey in super high-rise frame tube structure were put forward. The obtained conclusions are capable to be a reference for designers.

Seismic analysis of a super high-rise steel structure with horizontal strengthened storeys

Horizontal strengthened storeys are widely used in super high-rise steel structures to improve the lateral structural rigidity. This use has great effects on the seismic properties of the entire structure. The seismic properties of the Wuhan International Securities Building (a 68-storey super high-rise steel structure with three horizontal strengthened storeys) were evaluated in this study. Two approaches, i.e., mode-superposition response spectrum analysis and time-history analysis, were employed to calculate the seismic response of the structure. The response spectrum analysis indicated that transition parts near the three strengthened storeys were weak zones of the structure because of the abrupt change in rigidity. In the response spectrum analysis approach, the Square Root of Sum of Square (SRSS) method was recommended when the vertical seismic effects could be ignored. However, the complete quadratic combination (CQC) method was superior to SRSS method when the vertical seismic effects should be considered. With the aid of time-history analysis, the seismic responses of the structure were obtained. The whiplash effect that spectrum analysis cannot reveal was observed through time-history analysis. This study provides references for the seismic design of super high-rise steel structures with horizontal strengthened storeys.

Dynamic Elasto-Plastic Analysis of a High-Rise Hybrid Structure

Dynamic elasto-plastic analysis methods can actually indicate the characteristic of structure. This paper is concerned with the seismic performance evaluation of a super high-rise hybrid structure by using nonlinear dynamic procedure (NDP). By reasonable selection of input ground motions, the nonlinear dynamic analyses are carried out by using CANNY program. Then the seismic responses of hybrid structure under three different earthquake intensities are obtained. Comparing the responses of three levels with pre-established performance objective, the results show that all responses meet the requirements. At the same time, the inter-storey shear drifts are mentioned to judge the seismic behaviors of hybrid structure. Based on the large amount of structural response information, conclusion can be drawn that the super high-rise hybrid structure achieves the seismic performance objective.