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Banqiao, Taiwan

Jeng C.-H.,National Chi Nan University | Chen J.-R.,National Chi Nan University | Lin T.-C.,New Taipei City Government | Peng S.-F.,National Kaohsiung University of Applied Sciences
Structure and Infrastructure Engineering | Year: 2014

Seven reduced-scale prestressed concrete (PC) pile specimens for landing stages simulating four levels of corrosion were tested to investigate their structural cyclic lateral load-carrying behaviour. Three corroded specimens were repaired using fiber-reinforced polymer (FRP) jacketing before testing. In this paper, the force-based fibre element (FFE) and the OpenSees software are used to analyse the seven PC pile specimens, achieving good corroboration with tests. Because the corrosion in such piles is horizontally asymmetric, the validated FFE models are used to execute 78 pushover analyses along various lateral directions to determine the multi-directional lateral strengths of the six corroded specimens. Based on the FFE analyses and experimental observations, this study makes design recommendations for FRP jacketing for use in repairing corroded landing stage PC piles. The FFE modelling is also extended to simulate the entire pile-soil system of an in situ pile lateral load test, validating its feasibility and accuracy for an entire full-size pile-soil system. © 2013 © 2013 Taylor & Francis.

Lin T.-C.,New Taipei City Government | Jeng C.-H.,National Chi Nan University | Wang C.-Y.,Institute of Bridge Engineering of China Engineering Consultants Inc. | Jou T.-H.,National Chi Nan University
ACI Structural Journal | Year: 2012

Corrosion and deterioration of concrete piles are common prob-lemsfor wharf structures. In Taiwan, corroded prestressed concrete (PC) piles supporting landing stage structures are frequently repaired and strengthened using carbon fiber-reinforced polymer (CFRP) jacketing. This paper presents an investigation on corroded and CFRP-repaired PC piles for landing stage structures. Seven reduced-scale PC pile specimens were tested to investigate their cyclic lateral load-carrying behavior. Four types of specimens were made to simulate four different levels of corrosion severity. Three corroded specimens were repaired using the CFRP jacketing prior to testing. The experimental results showed that the CFRP jacketing is rather efficient in terms of lateral strength, capacity for deformation and energy dissipation, and stiffness degradation, and is effective in repairing the seismic-resistance capacity of the corroded specimens. This study also conducted finite element (FE) analyses to analyze the tests of the seven specimens, achieving good corroboration between the analytical results and the tests. © 2012, American Concrete Institute.

Chen P.-Y.,National Chiayi University | Lee P.-F.,National Taiwan University | Ko C.-J.,National Taiwan University | Ko C.-H.,National Taiwan University | And 2 more authors.
Wetlands | Year: 2011

We used non-metric multidimensional-scaling analysis (NMDS) to analyze the variation and associations of abiotic and biotic variables among and within three constructed wetlands in metropolitan Taipei. Abiotic variables included NH4-N, biochemical oxygen demand, total phosphorus, suspended solids, dissolved oxygen, water temperature, pH, and electrical conductivity and were sampled monthly from April to October 2007. Biotic variables included zooplankton and phytoplankton communities and were sampled in May and August 2007. We sampled front-compartment, mid-compartment, and effluent portions of each wetland. BOD, NH4-N, TP, DO, SS, and pH differed significantly (p<0.05) among the three wetlands. Phytoplankton communities in each wetland were unique. Zooplankton differed between the two wetlands (Hsin-Hai Bridge I and Fu-Zhou Bridge). Overall, the three wetlands supported unique abiotic and biotic communities. Zooplankton and phytoplankton communities were correlated to TP, NH4-N, DO, and pH levels. © Society of Wetland Scientists 2011.

Huang D.-C.,New Taipei City Government | Liu H.-H.,National Taiwan University | Chen A.Y.,National Taiwan University | Sun W.-Z.,National Taiwan University Hospital
Computing in Civil Engineering - Proceedings of the 2013 ASCE International Workshop on Computing in Civil Engineering | Year: 2013

The effectiveness of emergency medical service (EMS) depends on the existing physical infrastructure and the allocation of medical resources. EMS is a challenging task due to the spatial distribution of the population and the geographical layout in the urban region. The management of emergency medical units (EMUs) and hospitals should be assessed to provide an efficient service. The objective of this research effort is to assess the current EMS of New Taipei City using geospatial analyses such as facilities' service area. In this study, spatial statistics for EMUs and hospitals are conducted. In addition, regions that cannot be reached within 10 minutes under pre-assumed conditions by EMUs are discovered, and interpolation of the travel interval is conducted and investigated. The geospatial arrangement of EMUs, and the upgrade or new constructions of hospitals are suggested to strengthen the efficiency of the emergency medical response. Future work is directed towards more advanced and complex spatial and temporal analyses to better assess the city's medical infrastructure. © 2013 American Society of Civil Engineers.

Chen Y.-C.,Foundation Medicine | Chen Y.-C.,Tzu Chi University | Hwang S.-J.,Kaohsiung Medical University | Li C.-Y.,National University of Tainan | And 3 more authors.
Medicine (United States) | Year: 2015

Hepatitis C virus (HCV) infection is a risk factor for chronic kidney disease (CKD). However, it remains unclear whether interferon-based therapy (IBT) for HCV was associated with reduced risk of CKD. From the Taiwan National Health Insurance Research Database, we identified 919 patients who received 3 months or more of IBT as our treated cohort. This cohort was propensity score-matched 1: 4 with 3676 controls who had never received IBT for HCV infection (untreated cohort). Cumulative incidences of and hazard ratios (HRs) for CKD were calculated after adjusting for competing mortality. In the matched HCV cohort, the risk of CKD was significantly lower in the treated cohort (7-year cumulative incidence, 2.6%; 95% confidence interval [CI], 0.7%-6.9%) than in the untreated cohort (4%; 95% CI, 3.5%-5.2%) (P < 0.001), with an adjusted HR of 0.42 (95% CI, 0.20-0.92; P=0.03). The results also held in the overall HCV cohort. The number needed to treat for 1 fewer CKD at 7 years was 58. The reduced risk of CKD was greatest (0.35; 0.14-0.87; P = 0.024) in HCV-infected patients who received 6 months or more of IBT. Multivariable stratified analysis verified that greater risk reduction of CKD was present in HCV-infected patients with hyperlipidemia, diabetes, hypertension, and those without coronary heart disease. In conclusion, IBT, especially for 6 or more months, is associated with reduced risk of CKD in HCV-infected patients. Hyperlipidemia, diabetes, hypertension, and coronary heart disease can modify this association. Copyright © 2015 Wolters Kluwer Health, Inc. All rights reserved.

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