Life cycle analysis of structural systems of residential housing units in the Philippines

Date of Publication

2013

Document Type

Bachelor's Thesis

Degree Name

Bachelor of Science in Civil Engineering with Specialization in Structural Engineering

Subject Categories

Civil Engineering | Structural Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Andrews Winston C. Oreta

Defense Panel Chair

Alden Paul D. Balili

Defense Panel Member

Bernardo A. Lejano
Lessandro Estelito O. Garciano

Abstract/Summary

In designing a house, or any structure, there are three things commonly considered by the structural engineer these are represented in the safety-serviceability-cost triangle. Safety and serviceability ensure that the structure can fulfill its intended purpose by satisfying code requirements on strength, ductility, and deflections. Addressing economy, on the other hand, requires value engineering to produce an optimum design with reasonable cost. However, the triangle is increasingly found to be incomplete. There is the question of environmental impacts the structure may bear on society. But what parameter may be used to guide structural designers to make their structure "greener"?


This paper proposes the use of a "Structural Sustainability Index (SSI)", a single-score based on the life Cycle Assessment (LCA) framework. The SSI was derived from five environmental impacts, whose respective weights were determined from a survey of Civil Engineering professionals. The impacts and their weights are: Global Warming Potential (36%), Ocean acidification (10%), Human Toxicity (12%), Abiotic Material Depletion (16%), and Energy Use (26%).";"The concept was applied to low-cost housing units in the Philippines. Four models with approximately 60 sqm floor area were investigated. The structural systems of these houses are conventional reinforced concrete modular block system, I beam, and modified system. Among the four, the I beam house incurred the lowest SSI of 0.682 while the conventional had the greatest at 0.986. The I beam, however, was found to have the largest contribution in abiotic material depletion due to heavy steel usage. This could be lessened through recycling of steel, as the manufacturing stage was found to contribute the most damage. Significant improvements were made in all impact categories when converting from a conventional to a modified system using T-joints and wall stiffeners, for a total of 9.87% decrease in SSI. Costs likewise decreased.

With the SSI and LCA framework, sustainability concerns can be quantified by structural engineers and significant improvements can be made in designing."

Abstract Format

html

Language

English

Format

Print

Accession Number

TU19730

Shelf Location

Archives, The Learning Commons, 12F, Henry Sy Sr. Hall

Physical Description

xiv, 134, 41 unnumbered leaves, illustrations (some color), 28 cm

Keywords

Structural analysis (Engineering); Sustainable buildings—Design and construction

Embargo Period

4-23-2021

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