Why Lightweight Steel Is Gaining Attention
Roof structures must withstand a range of loads while protecting buildings and their occupants from rain, wind, heat, and other environmental conditions. The choice of roofing structure also affects construction costs, material availability, durability, and the overall weight transferred to the building.
In Indonesia, lightweight steel has increasingly become an alternative to conventional timber and heavier steel systems. The article notes that rising timber costs and declining timber availability have contributed to the adoption of lightweight steel roof trusses. The material also offers resistance to termites, good durability, and relatively straightforward installation.
Lightweight steel is designed with thinner sections than conventional structural steel. For roof truss applications, the article states that light gauge steel members generally have thicknesses between 0.45 and 1.00 millimeters. Reducing the structural weight can help lower the dead load transferred to other components of a building.
How the Roof Truss Was Analyzed
Sudarno P. Tampubolon used a quantitative descriptive approach to assess the proposed roof truss. The analysis combined computer-based structural calculations with a manual verification method.
The main software used was SAP2000, which calculates forces acting within structural members. Tampubolon then compared the results with the Ritter method, a classical structural calculation approach that can be performed without advanced structural-analysis software.
The proposed roof had an L-shaped configuration, a 1-meter span, a 30-degree roof slope, and a height of 0.3 meters. The design used C 75.35.0.65 and Reng 30.15.0.45 steel sections. The 30-degree slope was selected to support structural efficiency and reduce vulnerability to strong wind and rain loads.
The calculations considered several types of loads, including the weight of the roof and ceiling, worker loads, rainfall, wind pressure, and wind suction. This allowed the proposed structure to be evaluated under multiple loading conditions rather than based only on its own weight.
SAP2000 and Ritter Method Produced Consistent Results
One of the study's important findings was the consistency between the computer-based SAP2000 analysis and the manual Ritter calculations.
The manual calculation produced a support reaction of 109.6 kilograms, which was reported as consistent with the reaction obtained through SAP2000. The Ritter calculation also produced a 94.94-kilogram tensile force in one structural member and a -109.6-kilogram compressive force in another.
According to Tampubolon's conclusions, the lack of significant differences between the two analytical approaches indicates that the proposed design can be evaluated without necessarily depending on advanced software or technological resources. This could be particularly relevant in locations where access to specialized engineering tools is limited.
Material Efficiency Reached 93.3%
The most prominent result concerned the amount of steel required to build the proposed roof truss.
The design required 33.57 meters of material from a total available length of 36 meters. After cutting and assembly, only 2.43 meters remained.
The resulting material utilization efficiency was 93.3%.
The result highlights the importance of planning material cuts before construction begins. Rather than calculating only the total length of steel required, the design process also considered how individual pieces could be arranged to minimize unused material.
For construction companies, this type of planning can potentially reduce material waste and improve cost control. It may become increasingly valuable as construction projects face pressure to use materials more efficiently.
Implications for Construction and Engineering Education
The findings from Universitas Kristen Indonesia have potential implications beyond a single roof design.
For the construction industry, the study demonstrates how structural optimization and material-cutting planning can work together to reduce waste. A design that uses material efficiently may help contractors control material consumption while maintaining the required structural performance.
The use of lightweight steel also provides practical advantages. The article describes the material as having high tensile strength, relatively simple installation requirements, resistance to termite attack, and good durability. It reports tensile strength of approximately 550 MPa for the lightweight steel discussed, compared with about 300 MPa for conventional steel.
For civil engineering education, the comparison between SAP2000 and the Ritter method provides a useful example of how modern computational tools can be checked against fundamental structural mechanics. Students can see how computer-generated structural results relate to calculations based on established engineering principles.
The findings should nevertheless be interpreted within the scope of the design analyzed by Tampubolon. The 93.3% efficiency figure applies to the specific roof configuration, dimensions, material quantities, and loading conditions examined in the article. It should not automatically be treated as a universal efficiency rate for every lightweight steel roof.
What the Author Says
The study by Sudarno P. Tampubolon of Universitas Kristen Indonesia emphasizes that efficient construction can begin with accurate structural calculations and careful material planning. The article concludes that the proposed roof design is simple and widely applicable, while the agreement between SAP2000 and the Ritter method supports its evaluation in settings where advanced technology may not be readily available.
In practical terms, the study connects three elements: structural safety, accessible engineering calculations, and efficient material use. Together, these elements can help construction projects reduce unnecessary waste while maintaining the intended structural function.
Author Profile
Sudarno P. Tampubolon is affiliated with Universitas Kristen Indonesia. His published work covers structural engineering, including roof truss analysis, structural calculations, and the use of SAP2000 for evaluating building structures. The available article identifies him as the sole author and does not provide an academic degree in its author information; therefore, no degree is added here without supporting evidence.
Tampubolon has also published work comparing timber roof-truss calculations using SAP2000 and the method of joints, as well as research on wooden framework structures using SAP2000.
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