Journal of Architectural Environment & Structural Engineering Research

Journal Information
EISSN : 2630-5232
Current Publisher: Bilingual Publishing Co. (10.30564)
Total articles ≅ 49

Latest articles in this journal

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

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 16.0mm 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 bon-slip behavior, with an increase in the average bond strength, which is also observed with the reduction of the diameter of the bar.
Kelen Almeida Dornelles
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i2.2812

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 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 a decrease on the SR from 13% to 23% after one year of natural weathering, with higher decrease 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 SR 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.
Akinluyi Muyiwa L., , Ayoola Hezekiah A.
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2240

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.
Neda Mohammadi, Sayyid Rasool Sayyid Rasool Keshavarz, Zahra Zahra Darabi
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2186

In today's world some changes have been occurred in human lifestyle, these changes, along with the advantages, have led to a series of disadvantages including their disconnection with the nature. One of the most important areas to re-establish the relationship is the school. The presence of nature at schools, and holding some classes in nature, in addition to meeting the special needs of children causes their separation from those small and boring classes as well as their interest in courses . This study aimed to investigate the role of nature in children's learning. For this purpose, third, fourth and fifth grade classes of 3 schools were held outside the school environment and in the nature in 5 courses. The study is a combinational research and field, indirect observation and library data collection methods were applied, where in the indirect observation, two types of questionnaires were prepared related to the students and teachers and were randomly distributed among 580 students and 50 elementary school teachers. Test reliability was assessed using Cronbach's alpha and it was obtained to be 0.890. The results of this study indicate that the physical place as one of the factors in children's learning has the maximum impact on teaching and learning of children. At the end of the study and by investigating the existing factors in the environment we understood that the expansion of the nature and natural light of it causes the students' interest in lessons in nature.
Julius Caesar Kwio-Tamale, Nathan Kibwami, Godfrey Mwesige
Journal of Architectural Environment & Structural Engineering Research, Volume 4; doi:10.30564/jaeser.v4i1.2787

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

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

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.
Huaping Wang
Journal of Architectural Environment & Structural Engineering Research, Volume 3; doi:10.30564/jaeser.v3i4.2617

Structural performance is the most important index to declare the stability, safety and durability of structures in practical engineering. The performance degradation of structures becomes more and more common with the increase of service life. To ensure the safe operation of structures, the hot research has gradually changed from large-scale construction to the detection, repair, reinforcement, renovation and maintenance.
Hu Li, Ming Xian Wang
Journal of Architectural Environment & Structural Engineering Research, Volume 3; doi:10.30564/jaeser.v3i4.2542

The design analysis of Subsea PLET should consider various cases, including in-place analysis, lifting analysis, setting down analysis and so on. The size and vessel space should be checked in the structural design, and the fishing protection function should also be covered. The accurate setting-down process is the prerequisite for the successful construction of the subsea project. Therefore, it is necessary to simulate the various conditions included in the setting down process. Based on practical YC13-1 project and subsea environment condition, a special type of subsea PLET is designed for the pipe rehabilitation. Theoretical study is performed to discuss the load and Fluent software is used to simulate the problems encountered in the setting-down process. Comparison on the calculation results with ROV condition and without ROV condition, it indicates the effective suppression of the movement of PLET with ROV tractive action. The study can be a good reference and guidance for the design and construction of South China Sea oil and gas field project.
Huaping Wang, Tao Song, Heng-Yang Li, Si-Yuan Feng
Journal of Architectural Environment & Structural Engineering Research, Volume 3; doi:10.30564/jaeser.v3i4.2035

Many beam structures suffer from gradual performance degradation with the increase of service life. To recover the bearing capacity of these beams, carbon fiber reinforced polymer (CFRP) plates are developed to attached on the beam bottom. To check the structural performance of the CFRP reinforced beams, smart CFRP plate with FBGs in series is designed and LVDTs are adopted to measure the deformations. The deflection of the reinforced beam is given based on the elastic conversion cross-section method. The experimental results validate the effectiveness of the proposed algorithm. The study shows that the CFRP reinforced zone has a larger flexural rigidity than the pure steel beam zone. The general distribution of the deflection along the span of the CFRP reinforced beam can be described by the proposed formula. It provides a scientific design guidance for the deflection control of CFRP reinforced structures.
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