Journal of Architectural Environment & Structural Engineering Research

Journal Information
EISSN : 2630-5232
Published by: Bilingual Publishing Co. (10.30564)
Total articles ≅ 50
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Ebtesam Alawadhi, Jamilah Othman, Haza Hanurhaza Md Jani
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.3221

Abstract:
Many theories in sociology and psychology encourage people to maintain and contact with nature. Biophilia, for instance, examines the connection between humans and nature within the built environment. It is considered one of the solutions to human isolation from nature, especially in the workplace. This study examined the factors of employee's awareness and preference that affect biophilia application at the workplace. This study's primary data collection method is a survey questionnaire through which responses from 167 employees at the International Islamic University Malaysia (IIUM) were collected. The findings show that employee's awareness and preference have a significant positive effect on the biophilia application. Further research on this topic is necessary to understand other factors that may affect human's connection with nature at the workplace.
Kelen Almeida Dornelles
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.2812

Abstract:
The use of cool materials on the building envelope is one of the most cost-effective ways to increase indoor thermal comfort conditions in hot climates and decrease the cooling energy needs. Despite the benefit of reducing cooling loads, researches have demonstrated that aging of roof coatings changes the initial solar reflectance (SR), which influences the long term building thermal and energy performance. Thus, this work presents preliminary natural weathering tests performed on samples of nine white coatings exposed to natural weathering for one year in the city of Sao Carlos, Brazil. Solar reflectances were measured with a spectrophotometer before and after exposure, every 3 months, for identifying the effect of aging along the time. The findings showed changes of 13% to 23% on SR after one year of natural weathering, with higher decrease on SR for rougher surfaces. The cleaning process restored from 90% to 100% of the original SR, which means maintenance can be an effective solution to restore the initial SR. Simulations indicated that roofs with higher solar reflectance increase indoor thermal comfort conditions and decrease the cooling energy need for buildings in hot climates, but the aging of white coatings increased the cooling energy needs along the time
Ying Hua Li, Kesheng Peng, Junyong He, Qiangjun Shuai, Gang Zou
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.3128

Abstract:
When the bridge components needing maintenance are the world problem at present, and the health monitoring system is considered to be a very helpful tool for solving this problem. In this paper, a large number of strain data acquired from the structural health monitoring system (SHMS) installed on a continuous rigid frame bridge are adopted to do reliability assessment. Firstly, a calculation method of punctiform time-dependent reliability is proposed based on the basic reliability theory, and introduced how to calculate reliability of the bridge by using the stress data transformed from the strain data. Secondly, combined with “Three Sigma�?principle and the basic pressure safety reserve requirement, the critical load effects distribution function of the bridge is defined, and then the maintenance reliability threshold for controlling the unfavorable load state which appears in the early operation stage of this type bridge is suggested, and then the combination of bridge maintenance management and health monitoring system is realized. Finally, the transformed stress distribution certifies that the load effects of concrete bridges practically have a normal distribution; as for the concrete continuous rigid frame bridge with C50 strength grade concrete, the retrofit reliability threshold should be valued at 6.13. The methodology suggested in this article can help bridge engineers do effective maintenance of bridges, which can effectively extend the service life of the bridge and bring better economic and social benefits.
Carine N. S. Reis, Paulo R. L. Lima, Mônica B. Leite
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.2810

Abstract:
The operation of reinforced concrete structures is directly associated with the adhesion between the steel bar and the concrete, which allows the internal forces to be transferred to the reinforcement during the process of loading the structural elements. The modification of the concrete composition, with the introduction of recycled aggregate from construction and demolition waste (CDW), affects the steel-concrete interface and can modify the bonding stress, which is also influenced by the type and diameter of the bar used. In this work, the influence of the recycled fine aggregate (RFA) and types of steel bar on the steel-concrete bond was experimentally evaluated using the pullout test. Conventional concrete and recycled concrete, with RFA replacement level of 25%, were produced. Two types of steel rebars (i.e.,plain and deformed) with diameters of 10.0 and 16.0 mm were considered in this paper. The results indicate a reduction in the adhesion stress with the introduction of recycled aggregate, but this trend is influenced by the diameter of the bar used. The use of ribbed bars modifies the stress bonslip behavior, with an increase in the average bond strength, which is also observed with the reduction of the diameter of the bar.
Vikas Patel, Brijesh Singh, P N Ojha, Sahara Adhikari
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.3296

Abstract:
Apart from many advantages, High Strength Concrete (HSC) has disadvantages in terms of brittleness and poor resistance to fire. Various studies suggest that when polypropylene (PP) fibers are uniformly distributed within concrete, they play an active role in improving spalling resistance of concrete when exposed to elevated temperature while having no adverse effect on its mechanical properties. Therefore, there is a necessity to quantify the effect of the addition of polypropylene fibers in terms of the fiber dosage, the strength of the concrete, and the residual mechanical properties of fiber-reinforced concrete under exposure to high temperature from fire. The study was carried out on three water/cement (w/c) ratios (0.47, 0.36 & 0.20) using granite aggregate for determining short term mechanical properties of Polypropylene fiber reinforced concrete in comparison to control mix. The experimental program includes 100 × 200 mm & 150 x 300 mm cylinders with fiber volume of 0.5%, that were subjected to temperatures exposures of 400 °C and 600 °C for durations of 1 hour. From the results, it was observed that no significant enhancement in mechanical properties such as modulus of elasticity, Poisson’s ratio, split tensile strength, flexural strength, and compressive
, Mariana Higashi Sakamoto
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.3305

Abstract:
Augmented Reality (AR) applications can be used to improve tasks and mitigate errors during facilities operation and maintenance. This article presents an AR system for facility management using a three-dimensional (3D) object tracking method. Through spatial mapping, the object of interest, a pipe trap underneath a sink, is tracked and mixed onto the AR visualization. From that, the maintenance steps are transformed into visible and animated instructions. Although some tracking issues related to the component parts were observed, the designed AR application results demonstrated the potential to improve facility management tasks.
Julius Caesar Kwio-Tamale, Nathan Kibwami, Godfrey Mwesige
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2787

Abstract:
Cost over-run in building projects is endemic and routinely increases construction cost to as high as 52% of contract sums in Uganda. The consequence of this is underachievement of investment objectives due to additional costs to complete projects. This research investigated how procurement requirements and procurement methods combine to determine cost over-run of building projects. Procurement requirements of bid time, performance bond, insurance, workload and experience of contractors were investigated within contexts of procurement methods of open domestic bidding, restricted domestic bidding, open international bidding, restricted international bidding and requests for quotations. Purposive and snow-ball sampling were used in identifying construction professionals, consultants and contractors of building projects with cost over-runs. Correlation and independence of procurement requirements on 37 cost over-run datasets were analysed by Spearman's bivariate correlation co-efficient at 5% level of significance and variable inflationary factor of less than 5 respectively. Bid time and performance bond were found to reduce cost over-run of building projects most followed by workload and experience. Insurance increased cost over-run marginally. The novel contribution of this research is a model that explains 63% of cost over-run with 9% margin of error. Variants of the model, one for each procurement method is presented.
Jiawei Lin
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2227

Abstract:
Nowadays, several studies demonstrate that viewing nature has positive effects on human health and well-being. This essay discusses about the essential methods of viewing natural environment and their impacts on human well-being by clarifying four important theoretical models: reducing stress, lowering heart rate, improving outcome of surgery, and increasing attention. In addition, some important research results in this field are taken as examples to introduce research methods. By collecting and organizing existing studies and theories about the relationship between viewing nature and human well-being, the methods of viewing nature can be divided into two parts: viewing nature through specific media (e.g., through a window, a book, a painting or a videotape) and being with the presence of nature. This study aims to clarify the research significance of viewing nature and find deficiency in this field to maximize the role of landscapes in human health and well-being.
Abdulrasaq Kunle Ayinla, Ilelabayo Ismail Adebisi, Olubunmi Adedayo Olaoye, Emmanuel Oloruntoba Aina
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2229

Abstract:
Window opening operations are considered as one of the significant way of regulating indoor climate and maintaining thermal comfort in buildings, even when alternative active devices such as fans and air conditioners are available. This study investigates responses of occupants of the traditional core areas of Ibadan and Ogbomoso to thermal comfort conditions (thermal stress) through window opening behaviours. Climatic data of the two cities were subjected to Evans scale to predict their day and night thermal stress and questionnaires were administered to know how occupants respond to changing thermal conditions through window opening behaviours. Descriptive and inferential statistics were used in analysing the data.The study found the morning periods to be the most comfortable, the afternoon periods offer the most hot discomfort condition and cold discomfort is mostly experienced in the evening periods in both cities. Findings revealed that majority of occupants in both cities prefer to keep their windows opened in the morning and afternoon periods and an increase was observed in the numbers of occupants who prefer to keep their windows closed in the evening periods. This is an indication that building occupants in both cities actively respond to thermal stress using window opening operations. Results obtained from chi square analysis concluded that there is a significant relationship between occupants’ window opening behaviour and thermal conditions at different periods of the day in both cities. Recommendations were given on how to improve on window opening systems in the future.
Akinluyi Muyiwa L., , Ayoola Hezekiah A.
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2240

Abstract:
This study reviewed the theoretical issues relating to morphological and psychological design issues in building hospital design evaluation. The study of morphological configurations design issues in this study, concentrates on the elements of building, shape/form, the structure of the environment, the structural efficiency and the architectural appearance of the hospital building forms. The psychological design issues focused on the essential issues relating to Proximity, Privacy and Wayfindings. Through the literature review of previous models such as Haron, Khan (2012) Operational Efficiency Model, Hamid and Talib Usability Framework, (2012), Zhao, Mourshed & Wright (2009) Model, Alalouch, Aspinall & Smith Model (2016) and Hill & Kitchen (2009). A conceptual framework for physical facilities design evaluation and satisfaction in hospital buildings was developed. The study, however, provides useful information in the development of a design framework that can inform policy on hospital buildings.
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