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All Journal REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development
Dolu, A.
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Civil Engineering, Building, Construction & Architecture Decision Sciences, Operations Research & Management Engineering Environmental Science Transportation

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Analisis Perpindahan Besar Akibat Gaya Non-Konservatif Dolu, A.; Nasution, A.; Rivani, A.; Oka, G.M.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 3 Issue 1 (March 2022)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v3i1.407

Abstract

Structural applications based on large displacement analysis are widespread in various fields, such as the application of aircraft structures, membranes, cables, pipelines and risers. In this study, the author reviews the structural responses based on large displacement theory and non-conservative load models, assuming linear sections and materials. The parameters reviewed are the variation of the load factor and the variation of the slope angle of the load P at the end of the span. Solving non-linear differential equations with non-conservative force, using numerical integration method. The simulation results with the variation of the load factor with the angle of inclination, vertical and horizontal displacements are obtained, where the final orientation of the acting force corresponds to the deformation of the structure, and the maximum deformation occurs at a load angle of 90o, the deformation decreases for the angle orientation is getting smaller.
Kuat Lentur Balok Laminasi Kombinasi Kayu Jawa (Lannea Coromandelica) dan Gelugu (Cocos nucifera) Chauf, K.A.; Nurdin, S.; Dolu, A.; Armabelio, A.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.670

Abstract

The use of kayu Jawa (Lannea coromandelica) and gelugu (Cocos nucifera) is very necessary to reduce the forests exploitation as a source of wood raw materials. However, both have debility in terms of mechanical properties and maximum dimensional achievement. Therefore, a mixed glulam system can be applied to produce lightweight structural timber beams with adequate performance. This research is aimed at determining the flexural strength, stiffness, ductility and failure of mixed glulam beams combined with kayu Jawa and Gelugu. A series of bending tests were carried out on timber beams using the three point bending method on three categories of beams, namely B-J, B-G and B-L. B-J beams, consist of solid timber of kayu jawa which has density ± 0,60 gr/cm3, B-K consist of solid gelugu which has density ± 0.88 gr/cm3, while B-L consists of kayu jawa timber in the core zone and one layer of 10 mm thick gelugu with a density of 0,88 gr/cm3 on the tension zone. Each beams category consists of five replications with the dimensions of each beam being 50 mm of wide, 55 mm of high and 760 mm of span. Laminated beams (B-L) are glued with emulsion adhesive with Viscosity 2,500 – 4,500 cPS, resin content 90 – 91%, gel time: 1 hour and curing time 5 – 6 hours with two-sided coating of 250 gr/m2 and clamping force 2 MPa. The results of this research show that the flexural strength (fb) and stiffness (EI) of mixed glue laminated laminated beams are 1,3 times higher than B-J. Apart from that, mixed glue laminated laminated beams (B-L) there was an increase the ductility of 47% when compared to B-G.
Analisis Investasi Jasa Penyewaan Perancah (Scaffolding) di Kota Palu Nirmalawati, N.; Dolu, A.; Fadliah, I.; Alit, D.W.
REKONSTRUKSI TADULAKO: Civil Engineering Journal on Research and Development Vol. 5 Issue 2 (September 2024)
Publisher : Civil Engineering Department, Tadulako University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22487/renstra.v5i2.672

Abstract

Scaffolding is an auxiliary construction used in multi-storey building construction work, used so that the implementation of work in the field can be easier and faster. As the development of building construction in the city of Palu, the need for the use of scaffolding is increasing. So it is interesting for researchers to find out whether investors in the field of scaffolding rental are still feasible for the coming years to move in this rental sector. The literature study method uses investment feasibility calculations, secondary data is taken from existing data in the field, namely the number of building construction works in Palu city, company financial cash flow data, and uses NPV (Net Present Value), EAV (Equivalent Annual Value), IRR (Internal Rate of Return) , and DPP (Discounted Payback Period). Assume income from the number of rentals and rental prices for the next 20 years. Interest rate of 8% and inflation of 3.85% for a period of 20 years at the PT Lexindo Scaffolding company obtained an NPV value of Rp.2,168,897,376 > 0, an EAV value of Rp.197,646,803 > 0, an IRR value of 33% > 8%, and DPP value of 4.98 years <20 years, for PT. Jaya Scaffolding obtained an NPV value of Rp.6,995,506,453 > 0, an EAV value of Rp.755,554,338 > 0, an IRR value of 30% > 8%, and a DPP value of 5.51 years <20 years. The conclusion states that the investment in scaffolding rental services is still feasible to invest.
Co-Authors A. Nasution, A. Alit, D.W. Armabelio, A. Chauf, K.A. Fadliah, I. Nirmalawati, N. Nurdin, S. Oka, G.M. Rivani, A.