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Volume 12 (4); 25 July, 2022
Research Paper
Determination of Earthquake Behaviors of a Reinforced Concrete Building with and without Earthquake Base Isolation
Kaplan B, and Sahin F.
J. Civil Eng. Urban., 12(4): 51-60, 2022; pii:S225204302100008-12
DOI: https://dx.doi.org/10.54203/jceu.2022.8
Abstract
There are many fault lines within the borders of our country, especially the North Anatolian Fault line. For this reason, earthquake resistant structural design is a very important issue in order to prevent possible economic losses after earthquakes, especially the life safety of people living in our country. The main goal in earthquake insulation, which is a new approach in earthquake design of buildings, is to reduce the possible effects on the structure by placing flexible elements in the horizontal direction and rigid in the vertical direction, by greatly reducing the earthquake loads and accelerations acting on the superstructure. In this study, the earthquake behavior of the buildings, which were designed by the Housing Development Administration of the Republic of Turkey and designed as a base isolation support, and the structures designed according to the principles determined in the Turkey Building Earthquake Code 2018 by using base isolation, were determined according to the non-linear time history analysis method. The behavior changes of the structure designed using earthquake base isolation compared to the conventional structure were examined, and the period values, floor accelerations and base shear forces of the two structures were compared. As a result of the results obtained, the positive effects of the period increase and the decrease in floor accelerations in the earthquake insulated structure were revealed.
Keywords: Earthquake, Base Isolation, Non-linear time history analysis
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Research Paper
Property Value Pertinence for Residential Investments in Christian Mission Estates: An Investigation of Canaan-city of Ogun State, Nigeria
Akinjare OA
J. Civil Eng. Urban., 12(4): 61-67, 2022; pii:S225204302100009-12
DOI: https://dx.doi.org/10.54203/jceu.2022.9
Abstract
The rapid expansion and urbanization of Lagos state of Nigeria due to uncontrolled rural - urban migration seems to have succeeded in transforming the peri-urban areas of Ota, Ogun state into a mini economic hub, thus propelling property values skywards. The present study ascertains if passing rents, as well as sales value for the various apartments in Canaan city estate as charged by the project developer, is overpriced, and underpriced or fair-priced. The rental data collected from the residents of the estate were compared with rental opinion obtained from practicing estate surveyors and valuers in Ogun State. 240 questionnaires were administered to residents of the estate while 22 questionnaires were administered to registered estate surveying and valuation firms. Interviews and questionnaires were deployed to solicit data from the Physical Planning Department (PPD) being the managers of the estate. The retrieved data were then collated and presented using figures and Tables. Findings showed that the passing rents for all cadres of residential apartments in the estate were discounted with the most discounted apartment type being the 2-bedroom luxury flats and the least discounted apartment type being the 4-bedroom semi-detached houses. For sales value, findings showed that the high end apartments – the detached houses, semi-detached and also the 3-bedroom terrace houses were hugely discounted. Unfortunately, the 1-bedroom and 2-bedroom flats were the least discounted while the 2-bedroom luxury flats and 3-bedroom flats were either within range or slightly overpriced. The study concluded that the passing rents were underpriced due to the income nature of tenants and subsequently, the sales value proposed by the developer of the estate was underpriced. The study recommended an upward review of sales prices should the estate proprietor still continue with the sales of its apartment within Canaan city.
Keywords: Residential property, Investment, Rental and Capital values, Value appropriateness, Estate Surveyors, Valuers.
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