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Zhiliang Ma,Jiankun Ma 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6
Integrated Project Delivery (IPD) is a new project delivery mode that is primarily characterized by all its participants, such as the owner, designer, and contractor, and specialties, such as architectural, structural, and Mechanical, Electrical and Plumbing (MEP), being involved earlier in a construction project and working collaboratively using Building Information Modelling (BIM) technology to enhance the overall merit of the project. Thus, collaboration among participants and specialties is critical in IPD projects. The challenge is that existing collaboration platforms may be unable to support the collaboration among multiple participants and specialties efficiently due to this characteristic. This paper formulates the application functional requirements for such a BIM-based collaboration platform by analysing case studies of IPD projects appearing in the literature and in industry documentations after formulating a 5-step method to justify whether a dedicated BIM-based collaboration platform needs to be developed for IPD projects and to facilitate its development if it is needed. First, the collaborative tasks among participants and specialties in IPD projects are identified with a DSM (Dependency Structure Matrix) method and verified by conducting a questionnaire with experts. Then, the application functional requirements are designed based on these collaborative tasks. Finally, 11 commercial collaboration platforms are examined to determine whether they can meet all the identified requirements and the requirements, which they cannot meet, are verified by conducting another questionnaire with experts. It is concluded that a dedicated BIM-based collaboration platform is necessary, and the formulated application functional requirements can be used in the development of such a platform or for customizing an existing commercial collaboration platform to better support IPD projects.
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An IPD-based Incentive Mechanism to Eliminate Change Orders in Construction Projects in China
Jiankun Ma,Zhiliang Ma,Jiulin Li 대한토목학회 2017 KSCE Journal of Civil Engineering Vol.21 No.7
As in other countries where DBB (Design-Bid-Build) is used, one of the major problems in construction projects in China is cost overrun, and its main cause is change orders that occur during the construction phase. As a new mode of project delivery, IPD (Integrated Project Delivery) is considered capable of solving major problems including change orders in construction projects by involving contractors in the design phase to optimize design results and by introducing an incentive mechanism through which cost savings are shared among participants. However, the existing incentive mechanisms are difficult to adapt in China because contractors rely on change orders to obtain profit from construction projects. This research aims to establish an IPD-based incentive mechanism to eliminate change orders in construction projects in China. First, the final account statement of a completed construction project was analyzed to obtain the economic law of change orders. Second, based on this economic law, this research established an incentive mechanism composed of a compensation method for contractors, another compensation method for designers and a method for calculating their parameters. Finally, 21 completed construction projects and a new construction project were used to validate the incentive mechanism. This research provides not only an applicable IPD-based incentive mechanism to eliminate change orders in construction projects in China but also provides an approach for applying IPD in any other country where DBB is used and where the existing IPD incentive mechanisms cannot be directly applied.
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Zhiliang Yang,Weisheng Du,Cun Zhang,Binjie Ma 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.6
Sandy mudstones of various sedimentary ages are deposited in the Dongsheng Coalfield in China. Studying the tensile mechanical properties of these sandy mudstones would provide a reference for underground construction in this area. Four sets of sandy mudstones with different sedimentary ages from Dongsheng Coalfield in China were selected as the research objects. First, the mineral composition and microstructure of the 4 sets of Brazilian disc specimens were obtained by X-ray diffraction and scanning electron microscope. With the increase of sedimentary age, the microstructure of sandy mudstone becomes denser. Then the deformation and acoustic emission (AE) characteristics of the specimens during the Brazilian tests were observed. The indirect tensile strength, peak strain, total strain and pre-peak energy accumulation of sandy mudstones showed an approximate increasing trend with sedimentary age increasing. AE hit rate of the specimens with longer sedimentary age was higher, and the AE signals of these specimens with longer sedimentary age were released more severely after the peak tensile strength. The influence of sedimentary age on the properties of sandy mudstones was discussed from three aspects: the main mineral components, the geostress environment of sandy mudstone, microscopic morphology and granular structure.
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