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Tserng H.P.,National Taiwan University | Yin S.Y.-L.,National Taiwan University | Yin S.Y.-L.,Ruentex Group | Ngo T.L.,National Taiwan University | Ngo T.L.,National University of Civil Engineering
Journal of Marine Science and Technology (Taiwan) | Year: 2013

Prebid planning is an essential function of construction project management that allows contractors to obtain projects with low cost while achieving other criteria. It also helps contractors during project execution and management. This research applied the manufacturing industry's lean theory to propose a lean prebid planning model (LPPM) for construction contractors. The LPPM can significantly eliminate the main types of waste in construction projects because it effectively combines three important concepts inthe manufactureing industry: transformation, workflow, and value generation. This modelincludes seven arrangement steps, which are described systematically to help contractors with real-world applications. A case study was implemented to demonstrate the accuracy and usefulness of the proposed model. The results showed a reduction of 9.1% in project cost and 37 days in project duration. Source

Ping Tserng H.,National Taiwan University | Yin S.Y.-L.,National Taiwan University | Yin S.Y.-L.,Ruentex Group | Lee M.-H.,National Taiwan University
Journal of Civil Engineering and Management | Year: 2010

The construction industry consists of many unstructured documents, which accumulate a large volume of tacit knowledge. In the general domain, a Knowledge Map can illustrate connections of knowledge and transfer tacit knowledge to explicit knowledge, but this is unsuitable on specific domain such as construction industry. This research generalized existing mapping rules to be applied to general and specific domain; and presented a novel and practical model for building knowledge map, named Knowledge Map Model (KMM). This model comprised of five procedures, including identifying problems, discussing with experts and users, establishing the classification structure, establishing the document base, and deciding the display model. Furthermore, this research establishes Knowledge Map Model System (KMMS) as a major tool to improve the knowledge map reused and shared among the practical process. Finally, this research validated the KMM in a real project of bridge maintenance. Source

Ou Y.-C.,National Taiwan University of Science and Technology | Ou Y.-C.,State University of New York at Buffalo | Ngo S.-H.,National Taiwan University of Science and Technology | Ngo S.-H.,Hong Duc University | And 5 more authors.
ACI Structural Journal | Year: 2014

An innovative seven-spiral transverse reinforcement is proposed for oblong reinforced concrete bridge columns. Compared to conventional single-spiral or two-spiral transverse reinforcement, the proposed scheme reduces the size of the spirals and hence improves the constructibility of spirals for large bridge columns. Four seven-spiral columns were tested under high shear stress to assess their performance. Comparable conventional tied and two-spiral columns were also tested. Test results showed that spirals in the proposed seven-spiral columns remained interlocked. With less transverse reinforcement, the seven-spiral columns achieved similar or better shear performance compared to the tied columns. The seven-spiral column exhibited the highest effective shear coefficient, followed by the two-spiral column and the tied column. Comparison of shear-strength predictions with the test results shows that the ACI 318 model generally provides conservative estimates, and the Caltrans SDC and Sezen models provide reasonable estimates of experimental behavior in terms of failure point prediction. © 2014, American Concrete Institute. Source

Chen Y.,Nanjing Southeast University | Feng J.,Nanjing Southeast University | Yin S.,Ruentex Group
Computers and Concrete | Year: 2012

Numerical studies are performed to predict the stress-strain behavior of rectangular RC columns confined by multi-spiral hoops under axial and eccentric compressions. Using the commercial finite element package ABAQUS, the Drucker-Prager criterion and the yield surface are adopted for damaged plasticity concrete. The proposed finite element models are compared with the published experimental data. Parametric studies on concrete grades, confinement arrangement, diameter and spacing of hoops and eccentricity of load are followed. Numerical results have shown good agreements with experimental values, and indicated a proper constitutive law and model for concrete. Cross-sectional areas and spacing of the hoops have significant effect on the bearing capacity. It can be concluded that rectangular RC columns confined by multi-spiral hoops show better performance than the conventional ones. Source

Wu T.-L.,Engineering and Construction Co. | Ou Y.-C.,National Taiwan University of Science and Technology | Yen-Liang Yin S.,Ruentex Group | Wang J.-C.,Engineering and Construction Co. | And 2 more authors.
Journal of the Chinese Institute of Engineers, Transactions of the Chinese Institute of Engineers,Series A/Chung-kuo Kung Ch'eng Hsuch K'an | Year: 2013

This study investigates the behavior of transversely reinforced oblong and rectangular bridge columns under combined axial and flexural loading, including eccentric compression and lateral cyclic loading under constant axial load. The transverse reinforcement schemes include conventional tie and multi-spiral reinforcement. The multi-spiral reinforcement for the oblong column comprises two interlocking spirals and, for rectangular columns, comprises two interlocking large central spirals interlocked with four small spirals at the corners. The amount of transverse reinforcement for all of the columns conforms to the current seismic bridge design specifications. Test results indicate that all of the columns exhibit ductile behavior with ductility capacities significantly higher than the ductility capacity required by the design code. The oblong spiral column with an amount of transverse reinforcement 43% that of the corresponding tied column shows strength, ductility, energy dissipation, and over-strength similar to the tied column. Additionally, the rectangular spiral column with an amount of transverse reinforcement 59% that of the corresponding tied column exhibits strength, ductility, energy dissipation and over-strength superior to the tied column. Moreover, the code P-M interaction analysis method can provide a conservative means of estimating nominal moment strength. The two code methods to determine the maximum probable moment strengths may not provide conservative estimates. Results of this study demonstrate that the maximum probable moment of the columns examined can be estimated conservatively as 1.4 times the nominal moment strength. © 2013 The Chinese Institute of Engineers. Source

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