Judul: Efficiency Improvement in multi-story building construction with BIM 5D Application
Abstrak: Sebagian besar perusahaan konstruksi di Indonesia saat ini masih menggunakan aplikasi konvensional yang dilakukan secara terpisah. Akibat yang sering ditemukan dari penggunaan aplikasi konvensional terfragmentasi antara lain adanya limbah konstruksi dan keterlambatan informasi yang menyebabkan inefisiensi biaya dan waktu. Oleh karena itu, dibutuhkan suatu sistem integrasi yang dapat menjawab permasalahan tersebut. Salah satu teknologi yang telah muncul untuk menjawab permasalahan adalah Building Information Modeling (BIM). Penelitian ini dilakukan dengan simulasi pemodelan dan perhitungan untuk mengevaluasi akurasi dan efisiensi biaya pada pekerjaan besi dan beton menggunakan BIM 5D dengan aplikasi Cubicost dibandingkan dengan aplikasi konvensional. Simulasi proyek dilakukan pada apartment 16 lantai. Hasil penelitian ini menunjukkan penggunaan aplikasi BIM 5D dapat mengurangi biaya tenaga kerja sebesar Rp171.989.939,00 atau menghemat 6.33%. Nilai efisiensi volume pekerjaan beton untuk elemen kolom, balok, dan pelat masing-masing sebesar 10,87%, -2,60%, dan 10,80%. Sedangkan nilai efisiensi volume pekerjaan besi tulangan untuk elemen kolom, balok, dan pelat sebesar 2,64%, -2,31%, dan 23,43%. Total efisiensi biaya yang didapatkan sebesar Rp427.920.149,00. Biaya tersebut sangat besar dibandingkan biaya investasi aplikasi BIM 5D seharga Rp127.000.000,00., Most construction companies in Indonesia currently still use conventional applications that are carried out separately. The consequences that are often found from the use of fragmented conventional applications include construction waste and delays in the information that cause cost and time inefficiencies. Therefore, an integrated system is needed to answer these problems. One technology that has emerged to answer these problems is Building Information Modeling (BIM). This research was conducted by modeling simulations and calculations to evaluate the accuracy and cost-efficiency of using the BIM 5D application compared to conventional methods in rebar and concrete work. The project simulation was carried out on a 16-floor apartment. As a result, the use of the BIM 5D application can reduce labor costs by Rp171,989,939.00 or save 6.33%. The volume efficiency values of concrete work for column, beam, and slab elements are 10.87%, -2.60%, and 10.80%, respectively. Meanwhile, the volume efficiency values of rebar for column, beam, and slab elements are 2.64%, -2.31%, and 23.43%. The total cost-efficiency obtained is Rp427,920,000.00. This cost is huge compared to the investment cost of the BIM 5D application for Rp127,000,000.00.
Keyword: Aplikasi BIM 5D, Building Information Modeling, Efisiensi Biaya

Judul: Application of 5D Building Information Modeling (BIM) in Simpang Temu Dukuh Atas Building Project, Central Jakarta
Abstrak: Building Information Modeling (BIM) merupakan sistem yang dapat menangani masalah aplikasi konvensional bidang konstruksi. Tujuan penelitian ini adalah untuk melakukan pemodelan BIM hingga 5D menggunakan software Tekla Structres pada proyek Gedung Simpang Temu Dukuh Atas, Jakarta Pusat, serta melakukan analisis kinerja waktu konstruksi, membandingkan volume pekerjaan hasil perhitungan BIM dengan volume pekerjaan perhitungan BQ. Pemodelan 3D dilakukan sesuai dengan shop drawing. Pemodelan 4D dilakukan sesuai master schedule untuk melakukan visualisasi penjadwalan gedung. Pemodelan 5D dilakukan dengan report hasil volume perhitungan BIM dan dibandingkan dengan perhitungan berdasarkan dokumen BQ. Dalam pelaksanaan pembangunan proyek, terjadi keterlambatan proyek dengan keterlambatan paling besar pada bulan April 2022 dengan nilai keterlambatan sebesar -5,24%. Keterlambatan terjadi karena faktor cuaca dan dilakukan adendum dengan menambah tenaga kerja untuk mempercepat pekerjaan proyek. Perhitungan BIM didapatkan lebih kecil dibandingkan dengan perhitungan BQ dengan jumlah perbedaan volume beton sebesar 20,85% lebih kecil dan berat tulangan besi sebesar 26,32% lebih kecil dibanding BQ., Building Information Modeling (BIM) is a system that can handle conventional application problems in the construction field. The purpose of this study was to conduct BIM modeling up to 5D using Tekla Structres software in the Simpang Temu Dukuh Atas Building project, Central Jakarta, as well as conduct a performance analysis of construction time, comparing the volume of BIM calculation work with the volume of BQ calculation work. 3D modeling is done according to the shop drawing. 4D modeling is carried out according to the master schedule to visualize building scheduling. 5D modeling is carried out by reporting the results of BIM calculation volumes and compared with calculations based on BQ documents. In the implementation of project construction, there was a project delay with the greatest delay in April 2022 with a delay value of -5.24%. Delays occur due to weather factors and an addendum is carried out by adding manpower to speed up project work. The BIM calculation was obtained smaller than the BQ calculation with the amount of concrete volume difference of 20.85% smaller and the weight of iron reinforcement by 26.32% smaller than BQ.
Keyword: BIM, tekla structures, s curve, concrete volume, reinforcement weight

Judul: Posisi Filogenetik Kura-Kura Carettochelys Insculpta  (Reptillia: Testudinata)
Abstrak: Carettochelys insculpta is an endemic freshwater turtle of southern Papua and northern Australia. Phylogenetic position of this turtle is remain unresolved until now. Most of the research conducted show close relationships of C. insculpta and members of Trionychidae family. However, some of the research show distance between C. insculpta and members of Trionychidae family. This research is conducted to analyze phylogenetic relationship between C. insculpta and other members of Testudinata using 12S rRNA, 16S rRNA, and both gene as markers. DNA samples were obtained from three different organisms of C. insculpta. Two species used as outgroups were Alligator mississippiensis and Iguana iguana. Phylogenetic analysis was carried out using Neighbor-Joining method with Felsenstein 1981 (F81) modeltest. A polytomy tree of Testudinata was produced by using 12S rRNA gene. However, analysis using 16S rRNA and both genes as markers confirmed that C. insculpta was located between the Chelonidae and the Trionychidae family.
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