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Jachrizal Sumabrata
Fakultas Teknik, Universitas Indonesia, Indonesia
Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Education Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Transportation Other

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Analisis Kualitas Udara di Ruang Parkir Bawah Tanah dan Pengaruhnya Terhadap Pengguna Kristanto, Gabriel Andari; Sumabrata, Jachrizal; Astuti, Siti Kurnia
Jurnal Sains Dan Teknologi Lingkungan Vol 5, No 2 (2013): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

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Abstract

Semakin mahal dan terbatasnya lahan di perkotaan membuat pihak pengembang gedung banyak membangun berbagai fasilitas di bawah tanah, termasuk diantaranya adalah fasilitas parkir. Sayangnya keadaan ini seringkali mendorong perancang lebih memperhatikan kekuatan atau keindahan gedung dan ruangan dibandingkan faktor-faktor lain seperti kesehatan, sirkulasi udara, dan pencahayaan. Kondisi ruangan yang lebih tertutup dan lalu lintas sekitar yang seringkali macet, menyebabkan kualitas udara dalam ruang parkir bawah tanah menurun akibat pencemar udara terkonsentrasi hingga mencapai level membahayakan. Penelitian ini bertujuan mengukur kualitas udara di ruang parkir bawah tanah di Mall X di Jakarta dengan parameter CO, NO, dan total jamur dan bakteri dengan waktu pengukuran dilakukan pada hari kerja dan akhir pekan. Tingkat resiko kesehatan diukur dengan menggunakan kuesioner dengan klasifikasi responden berdasarkan lama waktu paparan dan maksud atau fungsi keberadaan responden tersebut di mall. Hasil pengamatan konsentrasi CO dalam parkir bawah tanah melebihi baku mutu yang dikeluarkan oleh Peraturan Gubernur DKI Jakarta No. 56/2006. Tidak terdapat baku mutu dalam ruangan untuk NO, tetapi tingginya kadar NO di ruang parkir bawah tanah memungkinkan pembentukan NO 2 melalui proses oksidasi di udara ambient dan menaikan konsentrasi NO 2 yang diemisikan secara lansung oleh kendaraan bermotor. Pertumbuhan jamur dan bakteri di dalam parkir bawah tanah dimungkinkan akibat kelembaban tinggi dan suhu yang hangat serta pemeliharaan gedung yang kurang. Kata kunci : pencemaran udara dalam ruangan, parkir bawah tanah, travel time, resiko kesehatan
EVALUASI KETERSEDIAAN INFRASTRUKTUR JALUR PEJALAN KAKI DI UNIVERSITAS INDONESIA Surya, Muhammad Safarudin; Sumabrata, Jachrizal; Tjahjono, Tri
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Walking is one of the short distance transportation activities for students of Universitas Indonesia. However, all around the campus there are still some pedestrian paths that are less maintained and connection-less than the rest. Knowing the existing condition of the current pedestrian infrastructure, factor in to the evaluation of the pedestrian pathways. This evaluation is necessary to determine the factors that influence the willingness of students to walk. This study uses survey and direct observation through the questionnaire given to the students of Universitas Indonesia. The results of the analysis based on the respondents' assessment variables for pedestrian infrastructure, indicates that the variable most influential is the facility itself, with a significance value below 0.01. As for the desire to walk away, the reliability of the walk way is the most influential variable with the significance values ​​below 0.01.
STUDI KARAKTERISTIK LALU LINTAS DARI PENERAPAN “CONTRAFLOW” DI JALAN TOL CAWANG – SEMANGGI (STUDI KASUS : ZONA AKHIR) Makarim, Moh. Fikri; Sumabrata, Jachrizal; Marino, Alan
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Implementation of the contraflow special lane is expected to provide a solution to the lack of road capacity at the inner city highway (Cawang – Semanggi) during peak hour time. This research was conducted to find out and compare the performance  of the characteristics of the traffic flow between two points of observation (middle point and the exit after the contraflow special lane) in order to know the effectiveness of the contraflow lane. This research uses traffic survey by means of recording traffic condition in both points of observation to obtain more accurate traffic characteristic data. The analysis of traffic characteristic performance is conducted by comparing the results of the survey to the traffic parameters of standards from the Indonesian Highway Capacity Manual and regulations from Bina Marga and Jasa Marga as well as the analysis through the relationship of traffic characteristics from Greenshields Theory to assess the traffic performance from both points of observation. The results show that the implementation of the special contraflow lane may decrease the degree of saturation from greater than 0.75 to less than 0.75 by giving the road additional capacity. This shows that the contraflow lane can be considered as an effective and worthy measure to ease the burden of the ever increasing number of cars passing through the toll road during peak hours.
STUDI ANALISIS FAKTOR-FAKTOR PENGARUH KETERSEDIAAN INFRASTRUKTUR TRANSPORTASI SEPEDA DAN PEMILIHAN MODA TRANSPORTASI SEPEDA DI UNIVERSITAS INDONESIA Gituri, Maulana Ichsan; Sumabrata, Jachrizal; Tjahjono, Tri
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Universitas Indonesia as one of the campus that provides a wide variety of modes of transportation for campus visitors, one of them by providing bicycle transportation facilities A bicycle transportation research in UI campus is needed to determine the factors that influence the availability of bicycle transportation infrastructure for the academic community and the desire to use the bicycle transportation modes. This study uses survey and direct observation using the enclosed questionnaire addressed to the academic community of the University Indonesia. Analyzing the data with descriptive statistical and non-parametrical statistic methods , which determine the correlation and linear regression . The results of the analysis on bicycle transportation infrastructure assessment showed that the most influential variable powerful facilities. While the desire for cycling , reliability variable is the variable that most strongly influences.
PENELITIAN PERSEPSI PEJALAN KAKI DI WILAYAH KAMPUS UNIVERSITAS INDONESIA Alyani, Ilma; Sumabrata, R. Jachrizal
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Currently walking is still not being a favorite way to transport in our society. Therefore, this research explored the opinions of people about the activity of walking itself. Different from any researches before, this research tried qualitative approach to explore the reasons why people are interested in and not interested in walking. The research was conducted using web-based questionnaire (online survey). After filtered, processed data includes the reasons why people are interested in and not interested in walking. Then this data analyzed using descriptive statistics and Chi-square correlation test using SPSS software. The test results showed that there is no significant correlation was found between gender and the reasons people are interested and not interested in walking.
ANALISIS KARAKTERISTIK PEJALAN KAKI DI PELATARAN STASIUN DEPOK BARU Mubarok, Ahmad Syahri; Sumabrata, R. Jachrizal
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Depok Baru Station is one of the crowded station in jabotabek station because there is an intermodal outflow between rail modes of transportation to land mode. There is no clear pathway for pedestrian so that makes uncomfortable. This research is to analyze the characteristc of that pedestrian flow between 07:00:00 to 08:00:00 and 17:00:00 to 18:00:00 pm by dividing into 5 sections. The 5 sections are Depok Station New to ITC Depok, Depok Baru Station Baru to Terminal Depok, Depok Baru Station to market, ITC Depok to market, Terminal Depok to Market. The results of this research, obtained on the area in the morning, from Depok Baru Station to Market is 3407 (org.m / min) with a level of service B and in the afternoon, from Depok Baru station to ITC Depok is 3.5 (org.m / min) with a level of service A. The result of this research can be made clear pedestrian pathways and comfortable.
STUDI KARAKTERISTIK LALU LINTAS DARI PENERAPAN LAJUR CONTRAFLOW DI JALAN TOL CAWANG – SEMANGGI (STUDI KASUS: ZONA MASUK) Fauzan, Ivan; Sumabrata, Jachrizal; Marino, Alan
Prosiding Forum Studi Transportasi Antar Perguruan Tinggi Vol 3 No 1 (2015): The 17th FSTPT of International Symposium
Publisher : FSTPT Indonesia

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Abstract

Jakarta, as a sprawling metropolitan, is burdened with the daily activities of its population and their everyday movements. The huge amount of vehicles, especially light vehicles, moving towards the business districts such as Semanggi has filled to capacity the toll roads, more specifically the Jakarta Inner Ring Road, and thus traffic is the result. To increase the capacity and to decrease traffic, PT Jasa Marga has implemented a contraflow lane that starts from km 01+600 until km 08+600. This research is to study the traffic characteristics from the contraflow lane, with the focus at the entrance zone and the middle zone. The emphasis of this study is to understand the performance and effectivity of contraflow lane and the effect it has on the toll road in regards of the traffic characteristics (capacity, volume, speed and density). The method of this research is to compare existing conditions that is surveyed first-hand with standards set from the Public Works Minister, MKJI (Manual Kapasitas Jalan Indonesia) and Greenshield’s Theory. The result of this research shows that the implementation of a contraflow lane decreases the degree of saturation from those greater than 0.75 to less than 0.75, by significantly increasing road capacity. Thus it can be concluded that the contraflow lane is effective and is an excellent means to decrease traffic.
KAJIAN KARAKTERISTIK LALU-LINTAS DI JALAN TOL SERTA KORELASI DENGAN POLA KECELAKAAN Ridha, Mujib; Sumabrata, Jachrizal; Siregar, Martha Leni
Warta Penelitian Perhubungan Vol 26, No 1 (2014): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (818.847 KB) | DOI: 10.25104/warlit.v26i1.867

Abstract

Penelitian ini dilakukan dengan membagi rumusan masalah menjadi 2 bagian yaitu bagaimana karakteristik lalu lintas (arus, kecepatan, dan kepadatan) di jalan Tol Jagorawi arah Bogor dan bagaimana karakteristik lalu lintas di jalan Tol Jagorawi yang menuju Bogor serta korelasi dengan kecelakaan. Penelitian ini bertujuan untuk menyelesaikan rumusan masalah yang ditetapkan yaitu untuk menganalisis karakteristik  lalu lintas (volume, kecepatan dan kepadatan) di jalan Tol Jagorawi arah Bogor dan mengkaji kecelakaan lalu-lintas di jalan Tol Jagorawi arah Bogor serta korelasi dengan karakteristik lalu-lintas. Metode yang digunakan untuk mencapai tujuan penelitian ialah dengan menggunakan metode regresi linear untuk menentukan hubungan antarvariabel lalu lintas melalui model Greenshields untuk pengolahan data primer dan metode tabulasi silang berdasarkan identifikasi kecelakaan untuk pengolahan data sekunder. Adapun untuk data primer didapatkan dengan melakukan perekaman data di area penelitian yang ditentukan dan data sekunder didapatkan dari data Laporan Kepolisian RI (KA Induk PJR Jagorawi). Setelah dilakukan pengolahan data maka didapatkan hasil yang menunjukkan bahwajumlah atau bobot kecelakaan terbesar berada di KM.6+400-KM.14+600 dengan kondisi jumlah arus kendaraan dan kecepatan tempuh yang tergolong rendah (berada kurang dari nilai median) sedangkan kepadatan yang tinggi (berada lebih dari nilai tengah) menghasilkan jumlah kecelakaan terbesar sehingga dapat disimpulkan bahwa pada segmen ini kecelakaan terbesar terdapat pada kondisi area penelitian yang cukup padat dengan jenis kecelakaan depan-belakang.Pada segmen/penggal jalan di lokasi KM.3+867-KM.4+700 memiliki jumlah dan bobot kecelakaan paling rendah bahwa jumlah arus dan kepadatan tidak mempengaruhi jumlah kecelakaan karena kecepatan  maksimum mencapai 34 km/jam ditambah kepadatan paling tinggi di segmen ini menyebabkan pengemudi kehilangan konsentrasi tinggi dengan jenis kecelakaan depan-belakang dan tunggal yang mendominasi.Dari perhitungan uji korelasi didapatkan nilai korelasi (r11) dan nilai determinasi (KD) masing-masing variabel yaitu korelasi angka kecelakaan dan volume sebesar 0,94, angka kecelakaan dan kecepatan sebesar 0,93, angka kecelakaan dan kepadatan 0,93 sehingga dapat disimpulkan bahwa terdapat hubungan linier diantara ketiga variabel tersebut. Kata Kunci :   karakteristik lalu lintas, jumlah dan bobot kecelakaan, jenis kecelakaan, analisis regressi hubungan dengan modelgreenshield, korelasi kecelakaan dengan karakteristik lalu-lintas.
KARAKTERISTIK PENYEBERANGAN PEJALAN KAKI PADA LINGKUNGAN SEKOLAH (STUDI KASUS SDN MEKAR JAYA 11 DAN SDN ABADI JAYA 1, KOTA DEPOK) Pradipta, Arya; Sumabrata, R. Jachrizal
Warta Penelitian Perhubungan Vol 22, No 2 (2010): Warta Penelitian Perhubungan
Publisher : Sekretariat Badan Penelitian dan Pengembangan Perhubungan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4847.423 KB) | DOI: 10.25104/warlit.v22i2.1034

Abstract

Pedestrian in school area has different characteristic rompare to commerce area, industry and officearea. Pedestrian especially students has immeasurable in movemeiit of schoolchild having the characterof and off the cuff is ices unforeseen generates accident, if mixed with vehicle traffic, so that safetyof pedestrian in school area, movement pattern of crossing and level of service of crossing facility ofpedestrian is made by important consideration in planning transportation facilihj especially in schoolarea.Intention of this research analysis is about crosswalk characteristic of pedestrian at school area, so thatas planning and scheme of pedestrian facilities and basic facilities can consider the pedestrian characteristicat school area, on the other hand, this research analyses about movement pattern and crossinglay time of pedestrian which can give information of crosswalk facilihJ h;pe of matching with ZonaSelamat Sekolah ( Z.OSS. .The pedestrian characteristics will be analyzed with microscopic methode. Sighting microscopic isapplied by see behavior of journey happened in each individual. By doing research microscopic henceknowable of characteristic, behavior and movement pattern of pedestrian individually. Researchmicroscopimlly could analyzed journey of pedestrianindividually in position and time, where variable applied is N(pedestrian number), T(time), X and Y(location co-ordinate). Location of observation of this research stays at school area at roadway BahagiaRaya, Depok, precisely stm;s at SDN Mekar Jaya 11 and SDN Abadi Jaya 1.Results of this research expected serve the purpose of one of reference in the relation with planning andscheme of crosswalk facilities in school area. Population applied in this research expected able torepresent is typical behavior of pedestrian in school area.Key Word: pedestrian, microscopic, crosswalk, Zona Selamat Sekolah (Z.OSS)
PEMANFAATAN ABU TERBANG (FLY-ASH) DAN SILICA FUME SEBAGAI BAHAN UTAMA GEOPOLIMER ALTERNATIF PENGGANTI SEMEN TRADISIONAL (OPC) Fadhil Muhammad Fajri; R. Jachrizal Sumabrata
Simposium II UNIID 2017 Vol 2 (2017)
Publisher : Simposium II UNIID 2017

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Abstract

Keadaan dunia hingga saat ini menunjukkan pertanda terhadap manusia bahwa bumi perlahan-lahan memburuk. Salah satu pertanda tersebut yaitu perubahan iklim global, yang kenyataannya masih tidak banyak masyarakat yang menganggap serius masalah ini. Salah satu penyebab utama perubahan iklim dan pemanasan global yaitu emisi gas rumah kaca yang tidak hentinya diproduksi. 76% emisi rumah kaca berasal dari emisi carbon dioxide (CO2) [2] . Dengan dasar kontrobusi emisi CO2 dari produksi semen sebesar 5-7%[4] yang berarti kontribusinya cukup besar, salah satu teknologi yang ikut berperan dalam menurunkan tingkat emisi CO2 adalah Geopolimer. Geopolimer merupakan teknologi alternatif yang telah menjadi perhatian khusus di kalangan peneliti dan industri karena sifat ramah lingkungannya yang menghasilkan tingkat emisi CO2 rendah dalam proses pembuatannya. Pemanfaaatan geopolimer sebagai prekursor altaernatif semen tradisional (OPC) ini bisa dianggap memenuhi kriteria untuk digunakan pada kegiatan konstruksi umum berdasarkan karakterisasi melalui Tes Kuat Tekan, Kuat Lentur, XRD, XRF, SEM, dan AAS.
Co-Authors A.A. Ketut Agung Cahyawan W Ahmad Syahri Mubarok, Ahmad Syahri Alan Marino Ayomi Dita Rarasati, Ayomi Dita Fadhil Muhammad Fajri Frans JSS Sihombing Gabriel Andari Kristanto Ilma Alyani, Ilma Ivan Fauzan, Ivan Kartika Puspa Dewi Martha Leni Siregar Maulana Gituri Maulana Ichsan Gituri, Maulana Ichsan Moh. Fikri Makarim, Moh. Fikri Mohammed Ali Berawi Muhammad Safarudin Surya, Muhammad Safarudin Nahry Nahry Pradipta, Arya R Ivan Adwitiya Raihan Alisha Nabila Ridha, Mujib Satria Adipradana Parlambang Sigit P. Hadiwardoyo Siti Kurnia Astuti Siti Kurnia Astuti, Siti Kurnia Sultan Rianto Tri Tjahjono Wuri Anny Yumantini