| Author | Villas, Julito Madulara |
| Call Number | AIT Thesis no.ST-90-24 |
| Subject(s) | Concrete construction--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | This study presents a concept of durability design for concrete structures with the
introduction of Durability Limit State. The new concept provides a methodology on how
to assess durability quantitatively in terms of service life.
The introduced Durability Limit State is proposed to meet the performance
requirements of concret~ structures with due consideration of structural durability. A
structure or part of a structure is rendered fail or unfit for use when its degree of degradation
at the end of service life exceeds this particular state. In this context, the durability limit
state is categorized into Limit of Ultimate Durability which corresponds to the maximum
load carrying capacity of a structure and Limit of Serviceable Durability which corresponds
to the behavior of structure in service under normal use. As one of the Limit of Ultimate
Durability, a Limit of Structural Safety is considered in this study. The Limit of Serviceable
Durability is subcategorized into Limit State of Comfortability, Limit State of Aesthetics
and Limit State of Water/ Air Tightness.
A durability index is introduced to have a quantitative examination for each limit state
being considered. The calculation of durability index combines the degradation model and
mechanical model to estimate the degradation mechanism with time. Depending upon the
level of requirements, the durability limit state consists of an examination of at least one
durability index in the durability design process. The concept on how to determine the
appropriate specific limit values of durability indices for a particular limit state is also
presented.
Illustrative durability design examples using the proposed durability design method
are presented. Due to the complexity of this subject, no attempt has been made to provide
all the possible degradation mechanism of concrete structures. Further research for the
degradation phenomena presented herein is encouraged to establish a reliable and unified
analytical formulae for estimating concrete durability for each limit state being considered. |
| Year | 1990 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Ueda, Tamon
|
| Examination Committee(s) | Pichai Nimityongskul ;Varma, Mahesh |
| Scholarship Donor(s) | The Government of Japan |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1990 |