In Malaysia, most of office building utilizes mechanical ventilation system to maintain its indoor air quality. However, if the mechanical ventilation system is not properly installed and maintained, it will contribute to poor indoor air quality which leads to decrease the productivity of office workers. This study assessed the correlation of indoor air quality toward working performance at office building in Universiti Tun Hussein Onn Malaysia using questionnaire survey. The findings revealed that the office can be categorized as sick building syndrome with the highest symptom is lethargy as marked by 75 % of the office workers. Since most of office workers are unauthorised to adjust temperature and air velocity of the air-conditioning system, this leads to the dissatisfaction toward indoor air quality where 40 % of the respondents are dissatisfied with temperature and air velocity. Ultimately, this study has successfully indicated that temperature has the strongest correlation with working performance as indicated by spearman correlation value of 0.648.
The increase in the number of terrorist attacks have shown that the effect of blast loads, such as the Friedlander blast load on elements of a building structure is a serious matter. Their effects on the structure should be taken into consideration in the design of the structure’s element. The objective of this study is to numerically analyze the blasting effect on stiffened orthotropic concrete plates within the elastic range of its material. The effects of the stiffener configuration, the location of the localized blast load as well as the influence of the thickness to the vertical deflection of the plate are solved numerically by using the two auxiliary equations in the x and y-directions. The analysis yields the vertical deflection versus time relationship which can be used to determine the stress distributions and the maximum stress value of the plate. This paper introduces the effect of the blast load on the orthotropic plates and essential techniques used to increase the capacity of a structure’s element to provide protection against explosive effects.
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