Recently, The construction industry is growing rapidly in the world, including in Indonesia. The construction of high-rise buildings, industry, and housing certainly has an impact on the environment, one of which is the lack of rain catchment areas. The green building concept is expected to reduce energy consumption significantly through several methods of passive design and active design without sacrificing comfort and productivity due to energy savings. One solution to support the concept of green building is the application of green roofs in buildings. Green roof is a building construction where there is a planting medium and vegetation on the roof. The most important green roof capability is the ability to withstand and hold rainwater, especially in urban areas and reduce energy consumption. This study provides an overview of the differences between extensive and intensive types of green roofs, the potential benefits of green roof applications on water quantity and quality, environmental impacts, opportunities and challenges of green roof applications, and economic benefits. Based on this positive aspect, it can be concluded that green roof is one of solution to reduce the environmental impact of buildings, save money, and save water reserves.
The availability of green space is decreasing along with the increase in population. Since then the land has been replaced by buildings as more people need a place to support human activities. As a result, the absorption of heat increases, causing the temperature in urbanized areas are higher relative to outlying areas (Urban Heat Island). Therefore, some efforts need to be made to reduce heat absorption, one of which is by applying the green roof. A strong roof structure and roof panel are required to implement green roofs. Wood is a material that has both strength and lightweight. However, the use of wood panels for roofing is not common in tropical areas due to the high rainfall. The wood roofing still has a potential to be used through the application of green roof technology that accommodate a waterproof layer and is not easily degraded by planting media. This study aims to examine the potential use of green roofs which made of wood structures and wood roofing in a tropical climate.
Cross-laminated timber (CLT) is made up of multilayered timber stacked perpendicularly, which improved the dimensional stability and allowing CLT to has high bearing capacity in its two direction. Despite all the advantages, CLT has not yet gain much attention in Indonesian, especially the utilization in mid-rise building construction. In order to have a better understanding about CLT as main structural element, the behaviour of mid-rise building made of CLT was assessed by running a 3D model of 5-story building by combining building code in Indonesia with CLT parameter from previous researcher as well as recommended adjustment from previous researchers. The research shows that CLT building statisy the allowable parameter for mid-rise building in Indonesia.
ABSTRAK Pembangunan yang berkelanjutan dengan konsep bangunan hijau membuat cross-laminated timber (CLT) saat ini menjadi alternatif yang dipertimbangkan dalam pembangunan di area urban. Berbeda dari glulam, lapisan-lapisan kayu pada CLT saling tegak lurus sehingga memberikan tahanan geser yang lebih besar pada dua arah transversalnya. Sementara itu, peraturan bangunan tahan gempa di Indonesia mengami perubahan dari SNI 1726:2012 menuju SNI 1726:2019 dengan perubahan nilai parameter respon spektra yang cukup berbeda. Konsekuensi akibat perubahan peraturan ini dianalisa terhadap perubahan perilaku struktur CLT. Dari hasil analisa didapatkan bahwa gaya lateral diafragma dan simpangan terbesar berdasarkan SNI 1726:2012 adalah sebesar 1433 kN dan 42 mm. Sedangkan gaya geser dan simpangan terbesar berdasarkan SNI 1726:2019 adalah sebesar 842 kN dan 24,5 mm. Dari hasil tersebut dapat dikatakan bahwa CLT masih efektif digunakan sebagai material untuk bangunan bertingkat menengah. Kata kunci: bangunan tahan gempa, cross-laminated timber, dinding geser kayu ABSTRACTGreed building is one of the main concepts in our soiety as we heading towards sustainable development goals. Cross-laminated timber (CLT) becomes popular as an alternative in constructing a building in urban area. Unlike glulam, each layer of CLT is stacked perpendicularly of, providing CLT with extra shear capacity in all transverse direction. Meanwhile, the standard of seismic resistant building in Indonesia has been updated from previously SNI 1726:2012 to the latest SNI 1726:2019, along with the change of respon spectrum parameter maps. The behaviour of CLT structure is therefore studied as the consequences of this change in order to see whether the performance of CLT structure still statisfy the lastest standard. The result shows that the shear load and maximum drift in accordance to SNI 1726:2012 are about 1433 kN and 42 mm, respectively. The shear load and maximum drift in accordance too SNI 1726:2019 are 842 kN and 24,5 mm, respectively. Both result shows that CLT mid-rise structure statisfy the previous standard and latest standard. Keywords: seismic-resistant building, cross-laminated timber, wooden shear wall
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