Title

Structural evaluation of the performance of concrete of an existing 10-storey building using ACI guide 214.4R-03 and 437R-03

Date of Publication

2007

Document Type

Master's Thesis

Degree Name

Master of Science in Civil Engineering

College

Gokongwei College of Engineering

Department/Unit

Civil Engineering

Thesis Adviser

Judy Sese

Defense Panel Chair

Jason Maximino C. Ongpeng

Abstract/Summary

The author was given the chance to be a part of the VNRV-L&S Building project. He was assigned in one of their projects which is the STRUCTURAL ASSESMENT OF THE L&S BUILDING. He was assigned to conduct an assessment on the concrete by means of visual inspection and laboratory tests. The L & S Building is a ten story with roof deck reinforced concrete structure designed and constructed sometime in the late 60's. The building was gutted with fire at the 4th to the upper level sometime in 1985 according to occupants. The building was renovated and minor structural remedies was made and now all floor areas of the buildings is being occupied and utilized. This indicates that except that the structure has undergone the normal wear and tear it, the fire it has experience might have affected the structural integrity of the concrete. From the limited data gathered during the ocular inspection, it is the impression of the inspector that the 8th floor is the most critical in terms of material deterioration. Beams, columns especially the slabs has undergone normal wear and tear. Column and beam manifested structurally sound appearance. No cracks or deformation was observed on these members. There were some concerns however on slab. The cracking and sagging of slab at the junction of the beam could mean that the heat due to fire could have affected it. Fire might have concentrated on this part of the structure. Though there was no visual occurrence of weblike cracks on concrete, the petrographic test however said otherwise. It revealed that microcracks were abundant in samples from the 7th and 8th floor and that cement paste subsequently crumbled due to the presence of numerous fractures. If this were the case, rebar might have been affected too. This could probably explain the sagging of floors.

Based on the results of the laboratory tests such as the outcome of the in place strength of concrete, there is really a need to perform or undertake a remedial measures to increase the load carrying capacity of the structure or probably reduced the live load capacity so as not to overstress the structural members of the structure. The author recommends that performing structural analysis is inevitable and further investigation of the steel should be made. In addition, further improvement in the evaluation procedure is recommended to improve the assessment of performance of concrete for existing buildings.

Abstract Format

html

Language

English

Format

Electronic

Accession Number

CDTG004121

Shelf Location

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

Physical Description

1 computer optical disc ; 4 3/4 in.

Keywords

Concrete--Testing; Buildings--Evaluation

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