CCDI Group

Beijing, China

CCDI Group

Beijing, China
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Tu J.W.,Hubei Engineering University | Que G.,CCDI Group | Tu B.,Hubei Engineering University | Xu J.Y.,Hubei Engineering University
International Journal of Civil Engineering | Year: 2016

Coupled vibrations may occur between ship lift structure and the ship chamber during seismic process due to the ship chamber being hung at the roof of the ship lift. An investigation is carried out to explore the possibility of using different devices to connect the ship lift towers and the ship chamber to prevent the coupled vibrations. A three-dimensional shell finite element model is established, and then simplified into a three-dimensional truss finite element model through dynamic equivalent principle. And the numerical model of coupled vibration analysis is formed through static condensation, calculating the coupled vibration response between the ship lift structure and the ship chamber under five connection conditions: no connection, rigid connection, spring, viscous liquid damper and magneto-rheological fluid damper. The result shows that no connection and rigid connection between them are both inadvisable; the magneto-rheological fluid damper provides better vibration damping effect if suitable semiactive control strategy is applied, in comparison with passive control devices. © Iran University of Science and Technology 2016.

Li J.,East China Jiaotong University | Hou L.,Curtin University Australia | Wang X.,Curtin University Australia | Wang X.,Kyung Hee University | And 3 more authors.
International Journal of Advanced Robotic Systems | Year: 2014

In the construction industry, research is being carried out to look for feasible methods and technologies to cut down project costs and waste. Building Information Modelling (BIM) is certainly currently a promising technology/method that can achieve this. The output of the construction industry has a considerable scale; however, the concentration of the industry and the level of informatization are still not high. There is still a large gap in terms of productivity between the construction industry and other industries. Due to the lack of first-hand data regarding how much of an effect can be genuinely had by BIM in real cases, it is unrealistic for construction stakeholders to take the risk of widely adopting BIM. This paper focuses on the methodological quantification (through a case study approach) of BIM's benefits in building construction resource management and real-time costs control, in contrast to traditional non-BIM technologies. Through the use of BIM technology for the dynamic querying and statistical analysis of construction schedules, engineering, resources and costs, the three implementations considered demonstrate how BIM can facilitate the comprehensive grasp of a project's implementation and progress, identify and solve the contradictions and conflicts between construction resources and costs controls, reduce project over-spends and protect the supply of resources. © 2014 The Author(s).

Zhao X.,CCDI Group | Shen C.,CCDI Group | He S.,CCDI Group | Xia L.,CCDI Group
Assessment, Upgrading and Refurbishment of Infrastructures | Year: 2013

The use of external walls of a historic building as the decorative walls of the new high-rise building is presented here. In situ protection of historic walls has become very difficult due to the restrictions of the construction site, as well as the excavation of the foundation pit. At present, there is lack of similar experience in China. In this paper, a new design method through specific construction measures, computational analysis and experimental verification, is used to ensure that the external walls of the historical building and the new building are connected to each other firmly throughout the entire construction phase. The deformation, strain and dynamic characteristics of the external wall are monitored during the construction process. The latest monitoring data are used to adjust the calculation model and the design method to provide a reliable safety guarantee in the entire construction phase. The design method proposed in this paper will be useful for conservation of historic buildings in situ.

Chen M.,Central South University of forestry and Technology | He G.,Central South University of forestry and Technology | Liu C.,CCDI Group | Zou Y.,Hunan University
Tumu Jianzhu yu Huanjing Gongcheng/Journal of Civil, Architectural and Environmental Engineering | Year: 2013

An optimal distribution strategy of the energy dissipation dampers installed in the bottom stories of frame structures was put forward based on dynamic characteristics of base-isolated system. Firstly, the number of stories was defined by calculating the ratio of site characteristic frequency ω and bottom isolation stories natural frequency ωn of energy dissipation structure. Then, with regard to storey drift permissible value, the quantity and installation positions of dampers were defined through several simple calculations. 2 sets of actual strong earthquake records and 1 set of artificial acceleration time-history curve for a 10 stories frame structure were selected to conduct the time-history analysis under frequently and rarely earthquakes by ETABS software and Perform-3D software. The results show that the dynamic characteristics of energy dissipation structure in which the dampers are installed in lower stories are similar to those of base-isolated system.

Chen M.,Central South University of forestry and Technology | He G.,Central South University of forestry and Technology | Liu C.,CCDI Group
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2014

An optimum energy dissipation design method of frame-shear wall structure was proposed based on the theory of base isolation. Two commercial structural analysis softwares and two sets of actual seismic records and one set of artificial acceleration time-history curve were adopted to conduct linear and nonlinear time-history analysis for a 17-floor frame shear wall structure equipped with energy dissipation devices respectively. The results show that the method considers the viscous dampers installed in the axis without shear wall and the bottom floors of the structure, and the number of floors can be determined by the site characteristic period. The bottom storey is called isolation layer, when the fundamental period of isolation layer is equal to the site characteristic period, the effects of vibration reduction are perfect. The fundamental period of isolation layer can't be calculated from the total rigidity of isolation layer frame and shear wall, but the contribution of shear wall shall also be considered. The method is reliable and rational with an effective optimum result.

Xu X.,Beijing Jiaotong University | Xu X.,CCDI Group | Yang N.,Beijing Jiaotong University
Beijing Jiaotong Daxue Xuebao/Journal of Beijing Jiaotong University | Year: 2014

The behavior of steel frame with opening in beam web considering the effect of composite action is been analyzed using the Pushover analysis method in this paper. In order to contrast, we select four types of steel frame, respectively, according to whether there are concrete slabs and the opening in beam web. These frames are modeled and calculated using the SAP2000 finite element software. The plastic hinge model define of the joints is from the existing research results. Pushover curves, displacements and the distribution of plastic hinges of the different structures under two lateral load distribution pattern are calculated. The results show that, the composite action of concrete slab might increase the strength and bearing capacity of the structure and the weakening on the performance of the whole structure due to the opening in beam web is very small.

Fu X.,CCDI Group | Yu W.,CCDI Group | Sun C.,Dongguan University of Technology | Zhang Y.,CCDI Group
Jianzhu Jiegou Xuebao/Journal of Building Structures | Year: 2014

Based on the Shenzhen Pingan Finance Center, the long-term deformation under gravity load was analyzed. And the following influences were considered: concrete's shrinkage and creep, reinforcement ratio of vertical components, and construction simulations of elevation's adjustment according to design elevation. The super high-rise building's long-term deformation pattern under the gravity loads and the influence of non-uniform vertical deformation to the structure's safety were studied. Furthermore, the design concept that reserving certain length for vertical components in order to compensate for the vertical deformations was proposed during construction phase, so that vertical components could reach their design elevations and realize the floor leveling to meet the requirements of building's normal usage at specified time, and the method of the reservation of floors' elevation and the reservation of vertical components' blanking length was illustrated. The study shows that, by the analysis and control of long-term deformation under gravity load, the long-term deformation pattern, extra internal force of the structure can be obtained, and the floor's elevation can be controlled.

Chong H.-Y.,Curtin University Australia | Wang J.,Curtin University Australia | Shou W.,Curtin University Australia | Wang X.,Curtin University Australia | Guo J.,CCDI Group
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

Poor facility management has been attributed to lack of coordination and information during the maintenance process. The need for high quality applies not only to construction works and workmanship, but is also for its subsequent coordination and maintenance of a building. The paper aims to improve quality and performance of maintenance by integrating an advanced technology with a managerial approach, namely, building information modelling (BIM) and facility management. A BIM case study was investigated, which was located in Shanghai, China. Five significant areas were identified to improve the quality and performance of facility management, namely, centralized system, visualization, simplification, modifiable system, and smart emergency escape. The results highlight the benefits in applying the integrated system between BIM and facility management. It draws an insightful inference in enhancing quality services in facility management. © Springer International Publishing Switzerland 2014.

Chen M.,Central South University of forestry and Technology | Chen B.,Central South University of forestry and Technology | He G.,Central South University of forestry and Technology | Liu C.,CCDI Group
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2015

Considering that accidental eccentricity magnifies the seismic response of certain structure and has impact on the energy dissipation components in structures, a combined energy dissipation strategy blending viscous-fluid damper with buckling-restrained brace was put forward. Dampers were installed on the isolation layer at the bottom to dissipate seismic energy, and buckling-restrained brace was installed at the four corners of the building above the isolation layer,which enhances torsional rigidity of the structure and relieves the impact of accidental eccentricity and facilitates dissipating seismic energy in earthquake. Besides, two 10-storey-framework buildings with length-width ratios of 1.00 and 2.33 were selected and elastic analysis and elastic-plastic time-history analysis were made by adopting ETABS and PERFORM-3D. The results show that the impact of accidental eccentricity on the dissipation capacity of damping structure can not be ignored. With a proper number of dampers at the isolation layer, the seismic response control effect is greatly improved when lateral rigidity of buckling-restrained brace is increased. This energy dissipation strategy requires fewer dissipation components and meanwhile can ensure the utilization ratio of architectural space. Therefore, it is an optimized design for energy dissipation structures and has practical value. ©, 2015, Central South University of Technology. All right reserved.

Li J.,East China Jiaotong University | Wang Y.,Curtin University Australia | Wang X.,Curtin University Australia | Wang X.,Kyung Hee University | And 5 more authors.
International Journal of Advanced Robotic Systems | Year: 2014

Building Information Modelling (BIM) is a process involving the creation and management of objective data with property, unique identity and relationship. In the Architecture, Engineering and Construction (AEC) industry, BIM is adopted a lot in the lifecycle of buildings because of the high integration of information that it enables. Four-dimensional (4D) computer-aided design (CAD) has been adopted for many years to improve the construction planning process. BIM is adopted throughout buildings' lifecycles, in design, construction and operation. This paper presents five large-scale public and financial projects that adopt BIM in the design, construction and operational phases. Different uses of BIM are compared and contrasted in the context of the separate backgrounds. It is concluded that productivity is improved where BIM is used to enable easy sharing and integration of information and convenient collaboration. © 2014 The Author(s).

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