Mixed-used building in Dongguan

Building use

Other

Country/Region

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Overview

Column adopted steel tube -reinforced concrete column and some of the walls are made of steel plate concrete walls or section steel concrete walls. The steel secondary beams are considered to be combination beams, which can better control its height, contributing to the net floor height and obtaining better economic benefits.

Basic information (construction date, number of stories, gross floor area, adopted design code, engineer(s), Contractor(s), etc.)

Construction date: 2021
Number of stories: 93
Gross floor area: 226,800m2
Adopted design code: GB55001-2021; GB55002-2021; GB55003-2021; GB55006-2021; GB55008-2021; GB50223-2008; GB50009-2012; GB50068-2018; GB50011-2010; GB50010-2010; JGJ94-2008; JGJ3-2010; JGJ138-2016; GB50017-2017; GB50016-2014; JGJ8-2016
Engineer(s): China Academy of Building Research
Contractor(s): China Coal South Foshan Branch

Issue and/or innovation

The conceptual design method was adopted in the design. According to the seismic principles and building characteristics, the overall structural system design were first carefully studied and compared, so as to make it have good structural performance. In addition to ensuring that the structure is fully elastic under frequent earthquakes, the performance analysis of the main elements under moderate and rare earthquakes has been supplemented by the use of a variety of calculation procedures for elastic and elasto-plastic calculations. The results illustrate that all indicators perform well and meet the relevant requirements of the standards and the degree of irregularity is effectively controlled. Meanwhile, the calculation procedures results at each stage have been used to strengthen key elements, and structural measures have been dealt with accordingly.

Reason for composite solution

Column adopted steel tube -reinforced concrete column considering the following benefits: 1. CFT column consists of a steel tube filled with high strength concrete. The outer steel tube confines the core concrete and significantly improves the compressive strength which helps reduce the section dimensions and expand the usable space.
2. As the outer concrete withstands the relatively small axial force, it can achieve a ductile large eccentric compression damage pattern by configurating the appropriate amount of longitudinal and hoop reinforcement.
3. CFT section improves the shear bearing capacity of the column and the joint zone, easy achieving the strong shear and weak bending requirements.
4. The inner and outer concrete area adds stiffness and compressive strength to the tubular column and reduces the potential for inward local buckling.
5. The outer concrete acts as fire protection layer.
Some of the walls are made of steel plate concrete walls or section steel concrete walls. Steel plate shear walls can better control the magnitude of wall tensile stresses under moderate and bi-directional earthquakes, which is beneficial to the shear force ratio and contributes to the control of wall damage under rare earthquakes. Section steel concrete walls can better solve the joint connections with extension arm trusses and achieve the goal of strong nodes and weak members.
The steel secondary beams are considered to be combination beams, which can better control its height, contributing to the net floor height and obtaining better economic benefits.

Specific solution/technical details

1. As this project adopts the design idea of “high load bearing capacity and high structure performance”, the seismic performance of the core has been improved to elastic under moderate seismic. At the same time, the axial pressure ratio of shear wall was adjusted to 0.6.
2. The proportion of seismic shear borne by the frame is low, and the concrete core bears almost all seismic forces. The frequent and moderate seismic analyses are carried out according to this. The seismic shear force borne by the frame is enlarged according to the adjustment principle of 0.2V0.
3. The inclined wall, inclined column, body (cylinder) intake, through-storey column and its related components are considered as key components, with emphasis on strengthening seismic measures.
4. The core intake parts are adopted in layers and batches to reduce the adverse effects caused by sudden changes.
5. Through the cooperation of various professionals, the core cylinder mis-hole is minimised to improve the behaviour of the core.
6. The overhanging Vierendeel truss is set as the key element and is analysed in consideration of vertical earthquake and supplemented with continuous collapse analysis.
7. The efficiency analysis was carried out by setting truss torus or outrigger truss in the structural strengthening layer, and a comprehensive comparison was made to select the strengthening layer method.
8. The supplementary analysis of the damage sequence of the members under rare earthquake has been carried out, which indicates the secondary members yielded first and dissipated energy, effectively protecting the critical members, and the overall structural members yielded in a reasonable sequence.

Impact or effectiveness

1. Save land resources: Make full use of the limited land resources to meet people’s demand for residential, office and commercial purposes, thus maximising the saving of land resources.
2. Effect the city’s economy: Building construction and operation requires a large amount of human, material and financial resources, which can drive the development of the city’s construction industry, real estate industry, financial industry and other related industries, and thus improve the city’s economic level and competitiveness.
3. Improve the city’s image: This building is an important part of the city’s image, which can show the city’s modern, open, innovative, and developing image, attracting domestic and foreign tourists and investors, and promoting the city’s internationalisation process.
4. Improving urban traffic: The construction of super-tall buildings is usually accompanied by the improvements of transport infrastructure, including public transport, car parks and roads, thereby relieving the pressure on urban traffic and improving its efficiency and convenience.
5. Promote sustainable city development: The construction of the building adopts advanced building technology and energy-saving technology. And thus it reduces the pollution and energy, improving the sustainability of the building and promoting the sustainable development of the entire city.

References / Technical Papers Content

Liu J S, Xiao C Z, et al. 2021. “Model test on construction of long-span steel truss transfer structure in high-rise buildings.” J. Journal of Central South University (Science and Technology). 52(9): 3303-3313.