Heui-Yung Chang

National Chung Hsing University

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Chi-Ming Lai

National Cheng Kung University

Chu-Tsen Liao

National Taipei University of Technology

Ker‐Chun Lin

National Center for Research on Earthquake Engineering

Chien‐Kuo Chiu

National Taiwan University of Science and Technology

Ker Chun Lin

National Taiwan University of Science and Technology

Kuen Tai Liou

National University of Kaohsiung

Ching-Yu Yeh

Jou-Man Huang

National Chiayi University

Hideji Kawakami

Saitama University

Yao-Hung Wang

National Cheng Kung University

Cooperative Institutions

National Taiwan University

National Cheng Kung University

National Center for Research on Earthquake Engineering

National University of Kaohsiung

The University of Tokyo

National Taiwan University of Science and Technology

National Chung Hsing University

National Tsing Hua University

National Taipei University of Technology

National Applied Research Laboratories

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The Management Measure of New York City Landmarks Preservation Commission for Landmarked Building's Repair Work, Repair Works at Gainsborough Studios

LIAO Chu-Tsen WANG Liang-Yun Heui-Yung Chang

10.5176/2301-394x_ace13.99

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Citations (1)

Canopy-scale Built-environment Characteristics and Urban Heat Island Effect in a Tropical Medium-sized City

Sustainability (2021)

Jou-Man Huang Heui-Yung Chang Liang-Chun Chen Yu-Su Wang

Previous studies have found that built-environment characteristics in large cities produce important effects of the urban heat island (UHI) and know the horizontal space affected by the urban canopy microclimate ranges from about 30–200 m, but there are few studies in medium-sized cities. Therefore, this study investigates canopy-scale built-environment characteristics and their correlation with urban heat island (UHI) effects in Chiayi city, a tropical, medium-sized city. Under a 100 m buffer size, 2D and 3D built-environment factors such as the green coverage ratio (GCR), building coverage ratio (BCR), floor area ratio (FAR), and sky view factor (SVF) were first analyzed and then correlated with the UHI effect. The analyses were repeated on 200 and 1000 m scales and compared to previous studies. It was found that the built-environment factors were more strongly correlated with UHI under the 200 m buffer. Moreover, 2D factors such as the GCR and BCR had a higher correlation with UHI, especially in developing medium-sized cities. Regarding the GCR, BCR, and FAR, as expected, the correlation coefficients with UHI increased to 0.4 at 13:00 during the day and changed from 0.2 to 0.4 at 00:30 at night, whereas the correlation between the SVF and UHI was greatly different from the study area or calculation methods. The scale effect and SVF calculation methods are recommended for further study.

Urban Heat Island

Microclimate

Tropical climate

10.3390/su13020868

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Citations (4)

The Tapestry Cellular Automata phase unwrapping algorithm for interferogram analysis

Optics and Lasers in Engineering (1998)

Heui-Yung Chang C.W. Chen Chih‐Kung Lee Chenfei Hu

10.1016/s0143-8166(98)00054-2

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Root Cause Analysis on Fracture of SN490B Steel Column-Diaphragm Joints Using Elector-Slag Welding

Advanced materials research (2011)

Ker Chun Lin Sheng Jhih Jhuang Kuen Tai Liou Heui-Yung Chang

Recently, the weld fractures of column-diaphragm joints were reported to disrupt the cyclic loading tests on steel welded beam-to-column connections in Taiwan. This paper analyzes the root cause leading to the weld fractures. To confirm the effects of electro slag welding (ESW), the hardness, toughness and microstructure are investigated for a SN490B steel column-diaphragm joint. The result shows that the ESW process may give the weld a relatively low hardness. In addition, the heat affected zone (HAZ) can absorb much less energy than the parent material. In detail, the 30-mm thick parent material absorbs energy more than 105J, satisfying the code requirement of 27J at 0oC in the Charpy impact tests. However, the welding heat causes the microstructure of HAZ to be notably coarse, reducing the Charpy value to 21 J. To prevent the weld fractures, it is recommended to refine the grain sizes of HAZ, improving the toughness. It is also suggested to develop and use the compatible welding materials.

Charpy impact test

Slag (welding)

Diaphragm (acoustics)

10.4028/www.scientific.net/amr.337.608

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Stress Corrosion Cracking Risk to Stainless Steel Facilities in Coastal Regions of Taiwan

Tai-Lin Huang Heui-Yung Chang

Source

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Ventilation pattern and heat dissipation characteristics of a vertical dry storage cask for spent nuclear fuel: Wind tunnel experiments and CFD simulations

Annals of Nuclear Energy (2021)

Yao-Hung Wang Yi-Pin Lin Heui-Yung Chang Chi-Ming Lai

Grashof number

CASK

10.1016/j.anucene.2021.108364

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Citations (6)

POST-FIRE DAMAGE ASSESSMENT OF SLIP-CRITICAL CONNECTIONS

Proceedings of International Structural Engineering and Construction (2023)

Heui-Yung Chang Chi Wei Li Chu-Tsen Liao Ker‐Chun Lin Chi-Ming Lai

Steel buildings may encounter fire events during their life cycle. There is a necessity of exploring the ways of assessing the remaining capacity of steel structures after exposure to high temperature. In this study, the post-fire mechanical properties of slip-critical connections and the adopted high strength bolts are experimentally studied using an electronic furnace, an electronic torsion wrench, strain gauges and a universal testing machine. Each of the slip-critical connections is composed of a single JIS F10T high strength bolt and an A36 steel PL-70x70x18 (mm) with a standard hole in the center. The test parameters are elevated temperature (400°C, 600°C and 800°C) and exposure time (60 min, 90 min and 120 min). The test items include: (1) torque strength, (2) torque coefficient, and (3) bolt pretension. The tests are made before and after the connections are exposed to high temperature. The results obtained from the above tests can be used as an important reference for judging whether a steel structure continues to be used after fire damage.

Strain gauge

10.14455/10.14455/isec.2023.10(1).str-43

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Three-dimensional seismic damage simulation of wooden houses using a rigid body-spring method

WIT transactions on the built environment (2007)

Hideji Kawakami Eric Augustus Tingatinga Heui-Yung Chang

In Japan, the majority of modern residential and a fraction of commercial structures are of woodframed construction.The vast number of wooden houses is critical to the infrastructure of the country and their continued good performance is integral to the overall economic welfare.However, the casualties and damage caused by the 1995 Kobe earthquake suggest that these structures are most vulnerable to strong motion earthquakes.Therefore, in order to guarantee the safety of the general public in the event of future earthquakes, it is necessary to study the mechanisms of collapse of these built structures and to provide a way to identify their weak points for the benefit of retrofitting.To address the above issues, a new methodology was developed for the seismic performance assessment of wooden houses.This methodology identifies local failures such as column buckling and connection fracture, which may induce the global system to collapse.In this study, a three-dimensional rigid body-spring method, which can describe the inelastic behaviour of a structure and simulate the progressive collapse process, was employed.The sequence of the analysis and results in the form of computer animations offer a real-time assessment of the structural integrity of buildings during earthquakes.

Retrofitting

Progressive Collapse

10.2495/eres070401

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Post-fire performance evaluation of steel connections under a column-loss scenario

Developments in the Built Environment (2024)

Heui-Yung Chang Pin-Cheng Chiu Pin-Chen Lai Chi-Ming Lai

This study evaluates the post-fire performance of steel connections under a column-loss scenario. A series of fire tests, coupon tests and cyclic loading tests were carried out on 5 sets of 1/3-scaled SN400YB steel H-beam-to-H-column connections. After exposure to temperatures reaching 800 °C, the connections do not indicate any beam residual deformations or column drifts, and the steel properties, such as yield strength, tensile strength, and elongation, still meet the design requirements for room temperature. Under cyclic loading testing, fracture occurs in the base metal of beam flanges near the column faces of the connections subjected to high temperature and room temperature. Moreover, all the connections developed a moment strength greater than the 80% of nominal plastic moment strength of the beam after the first loading cycle with a drift angle of 0.04 rad. Finite element analyses were also conducted to simulate the test results, showing the severity of a column-loss scenario and the minor effect of initial heating rates. The results obtained from this work show the structural robustness of steel connections against earthquake shaking following a fire accident.

10.1016/j.dibe.2024.100412

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RESEARCH ON STRUCTURAL MODELS AND INPUT EARTHQUAKES IN SEISMIC PERFORMANCE EVALUATION OF LOW-AND-MIDDLE RISE SMRFs

Journal of Structural and Construction Engineering (Transactions of AIJ) (2004)

Heui-Yung Chang

With dynamic analysis, this paper attempted to illustrate the influence of structural models and input earthquakes on seismic performance evaluation of middle-and-low rise steel moment-resisting frames (SMRFs). Weak-columned SMRFs and artificial waves of an identical Fourier amplitude spectrum were selected to study herein. Analysis results showed that mass-spring models might evaluate as precisely as frame models, only if the relationship of shear force and story drift were setup equivalently. Moreover, the minimum acceleration rates of input earthquakes to have structural models reach the limit states such as elasticity and collapse would remain constant respectively. While the minimum acceleration rate necessary for the limit state of deterioration would significantly increase if the input earthquakes were changed from an epicentral type to an oceanic one.

10.3130/aijs.69.129_1

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Citations (3)