Resist the Wind Load of Jacking System in High Buildings

2014 ◽  
Vol 578-579 ◽  
pp. 572-575
Author(s):  
Fan Wang ◽  
Sheng Hao Mo ◽  
Zhi Feng Luo
Keyword(s):  
Wind Load ◽  
Concrete Core ◽  
Core Tube ◽  
The Real ◽  
Steel Columns ◽  
Steel Truss

When the crane can’t work for the altitude of the high buildings, we can consider about the jacking system. Jacking system include some steel truss, a steel platform, some steel columns and so on. The steel platform is nearly the area with the concrete core tube, it provides a place for workers to wrap the rebar, to pure the concrete. This article combine the real engineering, detailing introduce when the jacking system meet a big wind load, how does it morph, and compare the margin with the code in China.

The Behavior of the Salesforce Tower, the Tallest Building in San Francisco, California Inferred from Earthquake and Ambient Shaking

2019 ◽  
Vol 35 (4) ◽  
pp. 1711-1737
Author(s):  
Mehmet Çelebi ◽  
Hamid Haddadi ◽  
Moh Huang ◽  
Michael Valley ◽  
John Hooper ◽  
...  
Keyword(s):  
San Francisco ◽  
Design Procedure ◽  
Shear Walls ◽  
Performance Based Design ◽  
Concrete Core ◽  
Steel Columns ◽  
Modal Damping ◽  
Low Amplitude ◽  
Ambient Excitation ◽  
Story Building

The newly constructed tallest building designed in conformance with performance-based design procedure in San Francisco, California is a 61-story building equipped with an accelerometric array that recorded the January 4, 2018 M4.4 Berkeley earthquake. The building is designed with concrete core shear walls and perimeter gravity steel columns. The earthquake records as well as on-demand recorded ambient responses of the building are studied to determine its dynamic characteristics and building-specific behavior. At the level of shaking of either the earthquake or ambient excitation, the frequencies and low modal damping ratios (<2%) are similar. The building exhibits torsional behavior most likely due to abrupt asymmetrical changes in the size of the core shear wall. The translational and torsional modes during the earthquake are closely coupled, which leads to a beating effect, the period of which is calculable. Due to the relatively low-amplitude shaking during the earthquake, the drift ratios were small and did not cause any damage. It is expected that during stronger shaking levels, these characteristics may change.

On Deformation Charting for Concrete Filled Steel Tube Columns Concrete Core and Steel Shell

2018 ◽  
Vol 878 ◽  
pp. 126-131 ◽  
Author(s):  
Anatoly L. Krishan ◽  
Elvira P. Chernyshova ◽  
Rustam R. Sabirov
Keyword(s):  
Steel Tube ◽  
Steel Shell ◽  
Concrete Core ◽  
New Approach ◽  
Concrete Filled Steel Tube ◽  
The Real ◽  
Side Pressure ◽  
Core Function ◽  
Cfst Columns ◽  
Major Factors

New approach to creating deformation charts for concrete core and steel shell of round CFST columns is offered. For creating such charts the power resistance of short central the compressed concrete filled steel tube element is considered. At the same time two major factors are considered. First, the steel shell and the concrete core function under conditions of complex tension. Secondly, at step-by-step strengthening of axial deformations the side pressure upon concrete core and steel shell constantly changes. As a result coordinates of parametrical points of deformation charts for concrete and steel change. Such approach allows describing the real intense deformed condition of concrete filled steel tube columns more precisely.

Study on a Large-Span Steel Truss Roof Isolation Bearings for Wind Load Effect Isolation Effect

2013 ◽  
Vol 405-408 ◽  
pp. 1022-1027
Author(s):  
Zi Fen Fang ◽  
Zhi Qiang Zhang ◽  
Fei Liu
Keyword(s):  
Financial Services ◽  
Base Isolation ◽  
Wind Load ◽  
Isolation Effect ◽  
Load Effect ◽  
Large Span ◽  
Roof Structure ◽  
Rubber Bearing ◽  
Steel Truss ◽  
Load Effects

The isolation of large-span Steel Truss Roof structure is developed on the basis of base isolation. The isolation of large-span Steel Truss Roof structure is to limit the transmission of wind load effect to the substructure. Based on the engineering background, we mainly discuss using rubber bearing isolation structure wind load effects. This paper will explains and demonstrates the isolation mechanism of Large-span Steel Truss Structure,and than test and verify isolation effect by Calculating through the analysis of wind tunnel tests conducted on the Yancheng financial services center, which the steel truss roof isolation bearings for wind load effect isolation effect.

Site Measurement of Modularized Low-Position Hydraulic Jacking Formwork System

2013 ◽  
Vol 405-408 ◽  
pp. 3108-3112
Author(s):  
Ji Zhong Zhou ◽  
Ming Pi Liao ◽  
Jin Ping Zhuang ◽  
Qi Lin ◽  
Xue Feng Cai
Keyword(s):  
Tall Buildings ◽  
Construction Site ◽  
Hydraulic Jack ◽  
Supporting System ◽  
Steel Columns ◽  
Site Monitoring ◽  
Monitoring Result ◽  
Steel Truss ◽  
Platform System ◽  
Hydraulic Jacking

Jacking formwork system has been widely used in the construction of tall buildings and modularized low-position jacking steel platform formwork system is made up of several assembled and turnover subsystems, including steel truss platform system, steel columns supporting system, formwork and rack system, two-way-acting hydraulic jack and its control system.The paper described the application of the system in Fuzhou Yu Yang Central Golden Plaza Project and construction site monitoring were conducted. According to the site monitoring result, the performance of the jacking formwork system is further illustrated. In the end some suggestions were put forward to ensure construction safet .

scholarly journals Seismic Evaluation of a Multitower Connected Building by Using Three Software Programs with Experimental Verification

2016 ◽  
Vol 2016 ◽  
pp. 1-18 ◽  
Author(s):  
Deyuan Zhou ◽  
Changtuan Guo ◽  
Xiaohan Wu ◽  
Bo Zhang
Keyword(s):  
Complex Structure ◽  
Time History ◽  
Hybrid Structure ◽  
Shake Table ◽  
Analysis Model ◽  
Seismic Evaluation ◽  
Shake Table Testing ◽  
Concrete Core ◽  
Core Tube ◽  
Function Modules

Shanghai International Design Center (SHIDC) is a hybrid structure of steel frame and reinforced concrete core tube (SF-RCC). It is a building of unequal height two-tower system and the story lateral stiffness of two towers is different, which may result in the torsion effect. To fully evaluate structural behaviors of SHIDC under earthquakes, NosaCAD, ABAQUS, and Perform-3D, which are widely applied for nonlinear structure analysis, were used to perform elastoplastic time history analyses. Numerical results were compared with those of shake table testing. NosaCAD has function modules for transforming the nonlinear analysis model to Perform-3D and ABAQUS. These models were used in ABAQUS or Perform-3D directly. With the model transformation, seismic performances of SHIDC were fully investigated. Analyses have shown that the maximum interstory drift can satisfy the limits specified in Chinese code and the failure sequence of structural members was reasonable. It meant that the earthquake input energy can be well dissipated. The structure keeps in an undamaged state under frequent earthquakes and it does not collapse under rare earthquakes; therefore, the seismic design target is satisfied. The integrated use of multisoftware with the validation of shake table testing provides confidence for a safe design of such a complex structure.

Research on Seismic Performance Objectives of High-Rise Diagrid Tube Structures

2010 ◽  
Vol 163-167 ◽  
pp. 1100-1106
Author(s):  
Jun Teng ◽  
Wei Liang Guo ◽  
Bai Sheng Rong ◽  
Zuo Hua Li ◽  
Zhi Jun Dong
Keyword(s):  
Seismic Performance ◽  
Design Method ◽  
Time History ◽  
Lateral Stiffness ◽  
Related Factors ◽  
Concrete Core ◽  
Core Tube ◽  
Plastic Energy ◽  
High Rise ◽  
History Analysis

Diagrid tube structures have advantages on constructing high-rise buildings for its great lateral stiffness, but its seismic design methodology researches are limited. The two-stage design method in Chinese code is not specific enough for the seismic fortification objectives of this kind of structures. It is necessary to propose some specific seismic performance objectives for the key components. Typical CFST diagrid tube-concrete core tube structures are studied by dynamic elastic-plastic time-history analysis using Perform-3D program. The structure plasticity developing process is summarized and the distribution characteristics of seismic fortification lines between tubes are discussed. The influences of main structure lateral stiffness related factors on the plasticity developing process are researched. The key components of structure lateral stiffness and plastic energy dissipation are studied. The seismic performance objectives of the key components are proposed for the three-level seismic fortification objectives.

Dynamic Characteristic and Aseismatic Analysis of Tall Structures with Outriggers

2008 ◽  
Vol 400-402 ◽  
pp. 607-612
Author(s):  
Yu Chen ◽  
Pu Sheng Shen
Keyword(s):  
Reinforced Concrete ◽  
Response Spectrum ◽  
Time History ◽  
Free Vibrations ◽  
Steel Frame ◽  
Mode Analysis ◽  
Complete Analysis ◽  
Concrete Core ◽  
Core Tube ◽  
Finite Element Software

Based on the finite element software ETABS, the effect of outriggers on the seismic response of a 50-story steel frame-reinforced concrete core tube structure was analyzed in this paper. Periods of free-vibrations were obtained from mode analysis. Response spectrum on the seismic properties was discussed. Elastic time history method was used to get complete analysis of the structure adopting four seismic waves. Structural horizontal displacement, drift angle, internal force of components and the distribution of internal forces between inner tube and outer frame under earthquake were studied. The rational quantity and locations of outriggers were considered. Further research in elastic time history was presented considering the influence of quantity of outriggers when outriggers were all set in “reasonable locations”. Some suggestions about steel frame-reinforced concrete core tube structures with outriggers in earthquake areas were given.

Seismic Behavior of Composite High-Rise Buildings with SRC Column, Steel Beam and RC Core Tube

2012 ◽  
Vol 204-208 ◽  
pp. 2590-2594
Author(s):  
Bin Zhao ◽  
Juan He
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Shake Table Test ◽  
Scale Model ◽  
Steel Beam ◽  
Shake Table ◽  
Concrete Core ◽  
Core Tube ◽  
High Rise ◽  
High Rise Building

In this research, a reduced scale model of the composite high-rise building with steel reinforced concrete column, steel beam and reinforced concrete core tube was designed and tested by using the shake table test technology. The acceleration and displacement of the model were measured during the tests. The cracking pattern and failure mechanism were illustrated. Above the shake table test, the finite element analysis of the test mode was carried out. The main effort of the numerical analysis was focused on the selection of the nonlinear models. Based on the experiment results and the strategy of considering nonlinear property of the beam-column joint and the short beam of the concrete core wall were proposed. It is proved that the proposed strategy is effective and economical for seismic behavior assessment of such composite high-rise building structure system.

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