PurposeBIM has much potential to improve the effectiveness of construction works with respect to design, construction and maintenance. However, many Architecture, Engineering, and Construction (AEC) firms are still lagging in the adoption and implementation of BIM in both developing and developed countries. The purpose of this study is to assess the barriers to BIM implementation, and examine the ways forward to improve BIM adoption within the Nigerian AEC firms.Design/methodology/approachA comprehensive literature review and questionnaire survey were used in the study. The survey targeted four different AEC firms. These include architectural firms, facility management firms, quantity surveying firms and structural engineering firms in Lagos, Nigeria. The data obtained were analyzed using mean score, standard deviation, Kruskal–Wallis test, and factor analysis.FindingsThe study identified 20 barriers to BIM implementation and identified ten ways forward to improve BIM adoption in AEC firms, particularly in Nigeria. The relative importance of both the identified barriers and the ways forward were gauged. The Kruskal–Wallis tests revealed that except for one (out of 20) identified barriers, and one (out of 10) identified ways forward; there is no statistical significant difference in the perceptions of four different AEC firms. The factor analysis result grouped the 20 identified barriers into three major factors to include: weak top management support and BIM environment related issues; cost of BIM software and training issues; and incompatibility, legal, contractual, and culture related issues.Practical implicationsThe significance of the study cannot be over-emphasized due to BIM relevance to construction stakeholders and researchers at large.Originality/valueThe study findings would inform the decisions of the construction stakeholders to make some policy recommendations capable of positively influencing the full BIM implementation in AEC firms.

Co m p a r a tiv e a n alysi s of d riv e r s t o BIM a d o p tio n a m o n g AEC fir m s in d e v elo pi n g c o u n t ri e s : a c a s e of Ni g e ri a B a b a t u n d e , S, E k u n d ay o, DO, Ad e k u nl e, A a n d B ello, W h t t p:// dx. doi.o r g/ 1 0. 1 1 0 8/JEDT-0 8-2 0 1 9-0 2 1 7 Ti t l e Co m p a r a tiv e a n alysis of d riv e r s t o BIM a d o p tio n a m o n g AEC fir m s in d e v elo pi n g c o u n t ri e s : a c a s e of Ni g e ri a A u t h o r s B a b a t u n d e , S, E k u n d a yo, DO, Ad e k u nl e, A a n d B ello, W Typ e Articl e U RL This ve r sio n is a v ail a bl e a t : h t t p:// u sir.s alfo r d. a c. u k/id/ e p ri n t/ 5 6 1 0 4/ P u b l i s h e d D a t e 2 0 2 0 U SIR is a di git al c oll e c tio n of t h e r e s e a r c h o u t p u t of t h e U niv e r si ty of S alfo r d. W h e r e c o py ri g h t p e r mi t s, full t e x t m a t e ri al h el d in t h e r e p o si to ry is m a d e fr e ely a v ail a bl e o nli n e a n d c a n b e r e a d , d o w nlo a d e d a n d c o pi e d fo r n o nc o m m e r ci al p riv a t e s t u dy o r r e s e a r c h p u r p o s e s . Pl e a s e c h e c k t h e m a n u s c ri p t fo r a n y fu r t h e r c o py ri g h t r e s t ri c tio n s. Fo r m o r e info r m a tio n, in cl u di n g o u r p olicy a n d s u b mi s sio n p r o c e d u r e , pl e a s e c o n t a c t t h e R e p o si to ry Te a m a t: u si r@ s alfo r d. a c. u k .urnal of Engineering, Design and Techn ol y Journal of Engineering, Design and Technology Abstract 8 Purpose -Building information modelling (BIM) adoption is vital to productivity and 10 competitive nature of the construction sector. However, BIM adoptions have not been 11 generally embraced by many Architecture, Engineering, and Construction (AEC) firms, 12 particularly in developing countries; and studies that investigate the important drivers to BIM 13 adoptions among construction professionals through quantitative approach are limited. The 14 study purpose is to address the aforementioned gap. 15 16 Design/methodology/approach -The study used a literature review, a pilot study and a 18 questionnaire survey. The primary data were carried out using structured questionnaire 19 distributed to the four different, selected BIM adopters' AEC firms. These comprised 20 architectural firms, facility management firms, quantity surveying firms and structural 21 engineering firms in Lagos, Nigeria. Data obtained were analyzed using mean score, standard 22 deviation, Kruskal-Wallis test, and factor analysis.23 24 Findings -The study identified 23 drivers to BIM adoption and the relative importance of 25 the identified drivers was gauged from each selected BIM adopters' AEC firm category. The 27 result of the Kruskal-Wallis test showed that there is no statistically significant difference in 28 the perceptions of the four selected AEC firms in the mean ranking of the identified 23 29 drivers to BIM adoption. The findings from factor analysis categorized the identified drivers 30 into two major factors to include: cost and time savings, a...

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A developed small scale kenaf spinning and reeling machine was evaluated in this study. The machine uses the principle of the ring spinning technique to produce spun kenaf-yarn (single or double-ply). The machine component includes two 0.5 kW electric motors positioned on a 640×433×10 mm mild steel frame (with speeds of the electric motors controlled by 0.5 kW variable frequency drives), twisting spindle, inlet frustum, feed roller shaft, reeling and spinning shafts, bearings, and a bevel gear. The machine was evaluated using different spinning speeds (90, 100 and 110 rpm), reeling speeds (60, 70 and 80 rpm) and a kenaf sample (Ifeken DI 400). At the spinning and reeling speeds combination of 90 and 80 rev·min−1, the developed machine was able to produce a continuous length of kenaf yarn twisted at 95.5 turns per minute with a production speed of 0.94 m·min−1 at the highest efficiency (88.9%) of the machine. The level of twist of the spun yarn spun provides information on the required twist level for kenaf fibre as deviation from this value was discovered to cause deformation on the spun yarn. This machine was able to reduce the drudgery involved in the production of spun kenaf-yarn and the technology is expected to positively influence kenaf’s growth and utilization in Nigeria.