The Company sticks to the innovation-driven development strategy, boosts technical innovation, attaches importance to cultivation and stimulation of talents ’consciousness and vitality of innovation, and improves the construction of innovation mechanism and platform. As a result, its comprehensive engineering technology innovation and R&D abilities are increasingly strengthened. It has made outstanding achievements in terms of engineering technology R&D and application, technical standard research and compilation, professional application software R&D and utilization, as well as transformation of patented technology and research results.
1.Seismic Isolation & Attenuation Technology
The Company actively promotes application of the new-type seismic isolation and attenuation technology in buildings. It has successively applied its leading building seismic isolation and attenuation design and technology in (super) large public buildings such as Guangdong Science Center and Wuhan Poly Plaza. Thus, it has achieved good economic and social benefits.
The Guangdong Science Center is the largest science center in the world and also the first colossal large-span steel seismic isolation building in China. This project is built with the innovative seismic isolation technology. A discrete seismic isolation layer is laid beneath each colossal column. By adjusting its internal structure, the laminated rubber seismic isolation seat is transformed to a new-type wind resistance seat. While meeting the building wind resistance requirement, the seismic isolation performance is improved to the greatest extent. Through a range of applications of seismic isolation technology, the safety of exhibition hall for this project is guaranteed in exposure of magnitude 7 earthquake and good comprehensive benefits are gained.
For the structural design of Wuhan Poly Plaza, the conventional aseismic design -“hard resistance” method is put aside to use the new-type energy-dissipation earthquake-reduction technology to reduce seismic damage. By taking a series of measures such as using circular concrete-filled steel tubular columns with good ductility, densifying column grids at both ends in the length direction to reduce torsion, installing non-linear viscous dampers on the floor of the main and annex buildings with big inter-floor deformation, as well as providing buckling restrained braces on the diagonal web member in the middle of connected truss, the seismic attenuation is achieved effectively. According to the shake table test, after the energy-dissipation earthquake-reduction measures are taken, the structure column stress decreases by 10.6%; the bottom shear wall strain is down by 14.6%; the maximum horizontal displacement of main building is reduced by 11.3% and the maximum horizontal displacement of annex building declines by 8%. According to the structural analysis and test results, the hybrid energy-dissipation earthquake-reduction technology for this project effectively ensures the structural safety and comfort. The Company takes the lead in application of the seismic isolation and attenuation technology through its research and practice in a wide range of engineering projects.For the structural design of Wuhan Poly Plaza, the conventional aseismic design -“hard resistance” method is put aside to use the new-type energy-dissipation earthquake-reduction technology to reduce seismic damage. By taking a series of measures such as using circular concrete-filled steel tubular columns with good ductility, densifying column grids at both ends in the length direction to reduce torsion, installing non-linear viscous dampers on the floor of the main and annex buildings with big inter-floor deformation, as well as providing buckling restrained braces on the diagonal web member in the middle of connected truss, the seismic attenuation is achieved effectively. According to the shake table test, after the energy-dissipation earthquake-reduction measures are taken, the structure column stress decreases by 10.6%; the bottom shear wall strain is down by 14.6%; the maximum horizontal displacement of main building is reduced by 11.3% and the maximum horizontal displacement of annex building declines by 8%. According to the structural analysis and test results, the hybrid energy-dissipation earthquake-reduction technology for this project effectively ensures the structural safety and comfort. The Company takes the lead in application of the seismic isolation and attenuation technology through its research and practice in a wide range of engineering projects.
2.Research on Serviceability of Large-span Structural Vibration of “Integrated Bridge and Building”
Based on a number of high speed railway stations with “integrated bridge and building”, we made systematic research on the topics concerning the evaluation and control of vibration serviceability, and applied the research results to the construction of large railway stations like Changsha South Railway Station, Xi'an North Railway Station, Taiyuan South Railway Station, Hangzhou East Railway Station and Zhengzhou East Railway Station, significantly improving the waiting passengers’ comfort in railway station. This research result won the First Prize of Hubei Science and Technology Progress Award in 2013.
The innovation in this research is mainly embodied in the following aspects:
(1) Considering the factors such as structural floor slab, non-structural elements, local structure and boundary conditions, additional mass of structure and selected value of damping ratio under small amplitude, we put forward the method of constructing fine structure model based on comfort evaluation for the first time.
(2) We set forth the evaluation standard for the serviceability of the waiting room floor of high speed railway station and the vibration limit of the floor, filling the gap of norms in this regard both at home and abroad.
(3) We brought forward the limit of vertical first order frequency to meet the requirement of comfort of long-span floor structure for the first time, and a simplified design method for meeting this requirement.
(4) We made research on the impact of man-structure interaction on the dynamic characteristics of structure, providing an important scientific basis for further enriching and perfecting the theory regarding serviceability of large-span structural vibration of “integrated bridge and building” in railway station of our country.
3.Research on New-type Large-span Spatial Structure
The research and application of long-span spatial structure technology is an important indicator to assess a country’s building technology level. Our company has been committed to the prospective study of new-type large-span spatial structure technology for a long time, and successfully applied our innovative research results to the engineering structure design of Xiamen North Railway Station, New Yan’an Railway Station, Changsha South Railway Station, Xi’an North Railway Station and Hangzhou East Railway Station, etc., fully demonstrating CSADI’s advanced building science and technology level.
As for the roof structure of Xiamen North Railway Station, we creatively adopted a large-span hyperbolic space grid composed of two-way unequal trusses, realizing the perfect combination of structural form and architectural indoor space and outdoor architectural effect, setting three new world records and winning wide acclaim in the industry:
(1) build a column-free waiting room of high speed railway station with the largest span in the world (two-way span of roof is 132m×220m);
(2) adopt a huge two-way hybrid frame structure system in large railway station building for the first time in the world;
(3) Adopt a new grid structure composed of two-way unequal trusses in roof for the first time in the world.
In 2015, Xiamen North Railway Station won the “Outstanding Structural Engineering Award” upon the approval of International Association for Bridge and Structural Engineering (IABSE).
In regard to the structural design of Changsha South Railway Station, we, taking into account the graceful architectural form, adopted tree-shaped steel tubular columns with multi-level bifurcation, reduced the span of curved steel grid roof via the spatial correlation between the bifurcated inclined columns and the curved grid roof, significantly reducing the amount of steel used for roof structure and achieving good economic indicator of roof. The application of tree-shaped columns with multi-level bifurcation and cast steel joints gives the building ecological beauty, smooth beauty and dynamic beauty. In order to study the impact of the water storage operation of the Three Gorges on the water environment, water ecology, scouring and silting and other aspects of the Yangtze River and Poyang Lake, the State has invested in building a number of model test halls. Actively participating in the construction of this important project, our company has successively completed the design work of the No. 6 Model Test Hall of the key laboratory of the Yangtze River channel and the model test hall of Poyang Lake Model Test Research Base.
The plane dimension of Poyang Lake Model Test Hall is 180m×110m. Without any interior column, the hall adopts a new intersecting truss string structure with a span of 110 meters, resulting in graceful architectural image and light and elegant structure and also effectively improving the out-of-plane stability of truss string structure. At the same time, the designer also creatively adopts the all-welded tension bearing node composed of gusset plate and round steel tube (patent number: ZL2013 20782464.3). This all-welded tension bearing node is a domestic innovation, featuring direct force transmission, high security and simple making. The whole roof steel structure, with innovative design, reasonable stress, convenient construction and economic cost, won the “China Steel Structure Gold Award” in 2014, the highest award for construction quality in China's construction steel structure industry.
4.Research and Formulation of Norms and Standards
Our company has actively participated in the research and formulation of the national standards, technical specifications of the industry, local standards and various standard designs. We acted as editor in chief in formulating the Technical Code of Cold-formed Thin-wall Steel Structures (GB50018), Code for Design of Store Buildings, Provisions on Depth for Preparation of Design Document for Construction Work and other national norms and standards. We also took part in the preparation of nearly 20 national norms and local standards including the Design Code for Residential Buildings, Code for Seismic Design of Buildings, Load Code for the Design of Building Structures, Technical Regulations on Cold-formed Thin-wall Steel Structures of Low-rise Residential Buildings, published the monograph titled Calculation Diagram of Concrete Structures, and served as editor in chief for or took part in the formulation of over 10 items of national building standard design and the regional project construction design in South-central China. Through the research and formulation of a series of national standards, technical specifications of the industry and local standards, we have effectively enhanced our technology level and core competitiveness and also made our due contributions to the architectural technology development of our country.
5.Development of Professional Application Software
Taking the widely used software like AutoCAD, Autodesk Revit, SAP2000 and ABAQU as the secondary development platform and taking into account the actual needs of design and production, our company has carried out software development work in terms of analysis of dynamic elastoplastics of high-rise buildings, BIM technology application, commonly used professional software data interface and secondary development of commonly used professional software, etc., and gained a number of software copyrights, effectively improving the design efficiency and quality and enhancing our technology strength.
（1）Software development for analysis of dynamic elastoplastics of high-rise buildings
ABAQUS-Based Processing Software before and after Analysis of Dynamic Elastoplastics (patent number: 2015SR024588)
（2）Research and Development of BIM Technology Application
AutodeskRevit-based Automatic Placement Software for Water Supply and Drainage Nozzle (patent number: 2015SR024585)
（3）Commonly Used Professional Software Data Interface
SAP2000 and Midas Gen Interface Software (patent number: 2011SR012081)
MIDAS and ANSYS Data Conversion Software (patent number: 2011SR012080)
SAP2000 and PERFORM3D Data Conversion Software (patent number: 2011SR100710)
（4）Secondary Development of Commonly Used Professional Software
Wind Tunnel Test Data Processing for Large-span Roof (patent number: 2013SR162704)
AutoCAD-based Software about Design of Joints of Steel Tubular Structures (patent number: 2013SR163001)
SAP2000-based Software about Inter Layer Displacement Statistics (patent number: 2011SR010860)
Steel-concrete Composite Section Design Software (patent number: 2011SR012412)
Software about Aided Modeling of Spatial Structures (patent number: 2011SR100716)