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All Journal MAKARA Journal of Technology Series Jurnal Ilmu Lingkungan Jurnal Teknik Sipil Jurnal Teknik Sipil dan Perencanaan Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Makara Journal of Technology Rekayasa Sipil Proceedings ACES (Annual Civil Engineering Seminar) Fondasi: Jurnal Teknik Sipil Jurnal Teknik Sipil Jurnal Ilmiah Dinamika Rekayasa (DINAREK) Jurnal Teknik Teras Jurnal Jurnal Ilmiah Universitas Batanghari Jambi SIKLUS: Jurnal Teknik Sipil JUTEKS - Jurnal Teknik Sipil Jurnal Rekayasa Sipil JURNAL PHOTON Astonjadro APTEK jurnal Teknik Industri - Unisi Jurnal Zona Civil Engineering Collaboration Dinamika Lingkungan Indonesia Makara Journal of Technology Sainstek (e-Journal) Jurnal Teknologi & Rekayasa Sipil
Ferry Fatnanta
Universitas Riau
Agriculture, Biological Sciences & Forestry Arts Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Nursing Physics Transportation

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PENGARUH VARIASI JARAK PELAT HELICAL TERHADAP KAPASITAS DAYA DUKUNG TEKAN PONDASI HELICAL PILE PADA TANAH GAMBUT DENGAN METODE CONSTANT STRESS OF PENETRATION Fatnanta, Ferry; Fadhilah, Randy; Nugroho, Soewignjo Agus
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

A study of the determination of helical pile bearing capacity based on static load test on peat soil has been done previously. However, the research is still covered in one method of loading which is the Constant Rate of Penetration (CRP). Therefore, it is deemed necessary to apply static load test on the helical pile on peat soils by using other loading method as a comparison. One of the test methods is Constant Stress of Penetration loading test. In this research, the helical piles used amounted to 9 piles. The loading were performed in six stages with a total load of 1200 kg. The data obtained from this test consist of settlement curve against time and loading curve against settlement. Determination of bearing capacities of helical piles were based on individual bearing and cylindrical shear method, and interpretation of test data based on Tangent Intersection and Terzaghi & Peck method. The results of the interpretation of the test data indicate that in the LMS (Large-Medium-Small)and LM (Large-Medium)helical pile groups have effective space between helical plates is from 20 to 30 cm. While in the LL (Large-Large) helical pile group, the effective space between the helical plates is from 30 to 50 cm. Based on comparison of calculation result with interpretation of test data, peat coefficient value used is 8%. Interpretation of test data tends to be closer to the cylindrical shear method with a standard error of 0.74 than the individual bearing method with standard error of 1.03.Keywords: Helical Pile, Peat Soil, Individual Bearing, Cylindrical Shear
Karakteristik Kuat Tekan Bebas Stabilisasi Semen Dan Kapur Tanah Cl-Ml Terhadap Siklus Pembasahan Pengeringan Hengki Tornando; Ferry Fatnanta; Gunawan Wibisono
Jurnal Rekayasa Sipil (JRS-Unand) Vol 16, No 2 (2020)
Publisher : Civil Engineering Departement, Andalas University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrs.16.2.105-118.2020

Abstract

Menurut grafik Casagrande tanah CL-ML diklasifikasikan tanah yang memiliki nilai indek plastisitas antara 4% - 7%, dan memiliki batas cair berkisar antara 12% - 30%. Beberapa lokasi di Kecamatan Tanayan Raya Kota Pekanbaru terdapat jenis tanah CL-ML, sifat dari tanah CL-ML ini sangat rentan terhadap penambahan kadar air sehingga akan menyebabkan tanah ini menjadi lembek pada musim hujan dan menjadi pecah-pecah pada saat musim kemarau. Dengan adanya sifat ini akan menjadi masalah jika dilakukan suatu konstruksi di atas tanah ini. Salah satu cara untuk memperbaiki  permasalahan ini maka dilakukan stabilisasi tanah. Bahan yang digunakan untuk stabilisasi pada penelitian ini yaitu menggunakan bahan semen dan kapur, siklus pembasahan dilakukan dengan cara merendam sampel pengujian ke dalam air dan siklus pengeringan dilakukan dengan cara sampel pengujian di letakkan (diangin-anginkan) di dalam ruangan terbuka. Hasil penelitian ini menunjukkan bahwa siklus pembasahan dan pengeringan dapat mempengaruhi nilai kuat tekan bebas dari tanah CL-ML. Penambahan 4% kapur dan 3% semen  pada tanah CL-ML meningkatkan nilai kuat tekan bebas. Pada umur pemeraman 0 (nol) hari nilai kuat tekan bebas tanah asli sebesar 133 kPa meningkat menjadi  673 kPa (5 kali lipat), pemeraman 14 (empat belas) hari   dari  142 kPa menjadi 1014 kPa (7 kali lipat), pemeraman 28 (dua puluh delapan) dari 168 kPa menjadi 1513 kPa ( 9 kali lipat).
Pengaruh Jumlah Pelat Helical Terhadap Daya Dukung Tekan Pondasi Tiang Helical Pada Tanah Gambut Dengan Metoda Pembebanan Constant Stress Of Penetration Usman, Fauzan; Fatnanta, Ferry; Nugroho, Soewignjo Agus
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 5 (2018): Edisi 1 Januari s/d Juni 2018
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

The selection of the type of foundation is very influential on the strength of a building construction. One of the alternatives that can be used as a substitute for cerucuk foundationis helical pile foundation. Helical pile a manufactured steel foundation consisting of one or more helix-shaped bearing plates affixed to a central shaft that is rotated into the ground tosupport structures. This research presented result of static loading test constant stress of penetration method helical pile conducted at peat. Result of data from loading test in theform of load and settlement will be interpreted with tangent of intersection method, and Terzaghi and Peck method. The addition of helical plate under first helical does not give anyeffect on pile capacity if helical diameter is smaller, when a helical plate at the same diameter is added, the pile capacity increase. For empiric formula calculation of helical pilecapacities show that chylindrical shear closer to the results of loading test, with standard error of 1,06.Key words: helical pile, peat, individual plate bearing, cylinder shear
KARAKTERISTIK STABILITAS PEMECAH GELOMBANG KANTONG PASIR TIPE TENGGELAM Ferry Fatnanta; Widi Pratikto; Haryo Armono; Wahyudi Citrosiswoyo
MAKARA Journal of Technology Vol 14, No 2 (2010): November
Publisher : Directorate of Research and Community Engagement, Universitas Indonesia

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Abstract

The Stability Characteristics of Sandbag Submerged Breakwater. Breakwater is one of coastal structures to overcome problems of abrasion. Due to difficulties in obtaining rock material at the coastal area. The using of sandbags as a breakwater provides advantages in utilizing local materials. A Sandbag has a smooth surface, so the internal shear forces are relatively small. According to these phenomena, the research for parameters that are expected to affect the stability of the sand bags. These parameters are a slope, shape and formation of sand bags. This experimental research conducted in two dimensional physical model and took place on the flume tank of Ocean Engineering Department, Faculty of Marine Technology, ITS. Scaled model 1 : 10. The bag was made in shapes, B1 and B2. Sand bags were prepared with the slope 1 : 1.5 and 1 : 2,0, width of top was 60 cm. The waves were regular waves, period of 1.5 seconds. The wave height was adjusted with the level of stability sand bags. It showed that the response of the sandbag was influenced by interlocking between sandbags. As a result, the stability depended on the change of wave forces, as a consequence of the change of slope and cross areas due to sandbags shape and formation type.Keywords: interlocking, internal friction, sandbag breakwater
TAHANAN CABUT TULANGAN BAJAPADA TANAH BERPASIR Fatnanta, Ferry; ', Muhardi; Putra, Hadiyan
Proceedings ACES (Annual Civil Engineering Seminar) Vol 1 (2015): Annual Civil Engineering Seminar (ACES)
Publisher : Proceedings ACES (Annual Civil Engineering Seminar)

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Abstract

Pertama kali metode perkuatan tanah tersebut menggunakan potongan logam sebagai perkuatantanah pada struktur perkuatan tanah. Jenis teknik perkuatan tanah tersebut sangat cocokdigunakan pada struktur dinding penahan tanah, struktur jalan, fondasi jembatan dan perbaikanlereng. Penggunaan tulangan baja sebagai perkuatan tanah menunjukkan bahwa selain strukturlebih stabil dan pemasangan lebih mudah, namun juga mampu mengurangi deformasi dalamarah vertikal dan lateral. Pasir bergradasi baik (SW) digunakan pada studi ini. Alasanpenggunaan pasir gradasi baik sebagai media uji karena pasir gradasi baik merupakan materialyang seharusnya digunakan sebagai material timbunan pada dinding penahan tanah, selainalasan tersebut di atas, pasir bukan merupakan tanah kohesif, jadi kekuatan geser tanah tersebuttidak dipengaruhi oleh kadar air. Sifat studi ini merupakan pengujian skala laboratorium. Padapengujian tahanan cabut ini menggunakan tulangan baja diameter 10mm. Pengujian tariktulangan baja dilakukan pada arah longitudinal, arah transversal, dalam bentuk persegi dan segitiga serta kombinasi bentuk persegi dan segi tiga. Pada setiap pengujian tarik tersebutdilakukan pada kondisi OMC (optimum water content) dan tegangan normal terhadap bajatulangan tersebut adalah overburden tanah. Dari berbagai variasi bentuk baja tulangan, hasilpengujian menunjukkan bahwa bentuk persegi mempunyai tahanan cabut yang paling besardibandingkan tahanan cabut bentuk lainnya, sedangkan bentuk longitudinal memberikantahanan cabut yang paling rendah.Kata kunci: baja tulangan, OMC, tahanan, pasir.
Perilaku Deformasi Pemecah Gelombang Kantong Pasir Tipe Tenggelam Ferry Fatnanta; Widi Agoes Pratikto; Haryo Dwito Armono; Wahyudi Citrosiswoyo
Jurnal Teknik Sipil Vol 18 No 2 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/jts.2011.18.2.3

Abstract

Abstract. Breakwater is one of coastal structures to overcome problems of abrasion. Due to difficulties in obtaining rock material at the coast area, so the using of sandbags as a breakwater providing advantages in utilizing local materials. Therefore, the problem of the rock material supply can be overcome. The environmentally oriented conservation of the coastal protection is necessarily built without damaging the beauty of the coast itself. That is why this research on behavior of the stability of submerged sandbag breakwater is carried out this experimental research conducted in 2-D physical model and take place on the flume tank of Laboratory Ocean Engineering Department, ITS Surabaya for stability test, it shows that the deformation of the sandbags is influenced by the elasticity of sandbags which depends on its dimension and density. The sandbags size influences the grip zone. As a result, the deformation of sandbag depends on the wave forces, as a consequence of the change of slope and cross areas due to sandbags shape and formation type. The formation of SK1 has relatively high stability; the structure with mild slope is more stable, and the sandbag shapes B1 more stable than B2 Abstrak. Pemecah gelombang merupakan salah satu struktur pantai yang digunakan untuk mengatasi permasalahan abrasi. Namun sering sulit ditemukan material batuan di lokasi tersebut, maka penggunaan kantong pasir sebagai pemecah gelombang menguntung karena menggunakan material lokal. Sehingga permasalahan suplai material batuan dapat terselesaikan. Pengaman pantai yang berwawasan lingkungan sangat diperlukan untuk mengamankan pantai tanpa merusak pemandangan pantai. Oleh sebab itu penelitian ini melakukan studi mengenai perilaku stabilitas pemecah gelombang kantong pasir tipe tenggelam.Penelitian ini berbentuk pengujian model fisik 2-D skala lab, yang dilakukan di Flume Tank Laboratorium Jurusan Teknik Kelautan, ITS Surabaya. Pada uji stabilitas menunjukkan bahwa respon kantong pasir dipengaruhi oleh elastisitas kantong pasir, sedangkan elastisitas kantong pasir tergantung pada dimensi kantong dan kepadatan kantong. Ukuran kantong berpengaruh terhadap zona jepitan, dimana zona jepitan ini dipengaruhi oleh perbandingan panjang dan tebal kantong. Perilaku deformasi kantong pasir tergantung pada elastisitas kantong. Sesuai hasil pengujian, deformasi kantong pasir tergantung pada gaya yang bekerja pada kantong, jadi deformasi kantong dipengaruhi oleh kemiringan dan luas penampang kantong, sebagai akibat perubahan bentuk kantong dan jenissusunan. Jenis susunan SK1 mempunyai stabilitas relatif tinggi; struktur dengan kemiringan landai lebih stabil, dan bentuk kantong B1 lebih stabil dibandingkan bentuk B2 untuk susunan yang sama.
The Stability Characteristics of Sandbag Submerged Breakwater Fatnanta, Ferry; Pratikto, Widi; Armono, Haryo; Citrosiswoyo, Wahyudi
Makara Journal of Technology Vol 14, No 2 (2010)
Publisher : Directorate of Research and Community Services, Universitas Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (552.95 KB) | DOI: 10.7454/mst.v14i2.192

Abstract

Breakwater is one of coastal structures to overcome problems of abrasion. Due to difficulties in obtaining rock material at the coastal area. The using of sandbags as a breakwater provides advantages in utilizing local materials. A Sandbag has a smooth surface, so the internal shear forces are relatively small. According to these phenomena, the research for parameters that are expected to affect the stability of the sand bags. These parameters are a slope, shape and formation of sand bags. This experimental research conducted in two dimensional physical model and took place on the flume tank of Ocean Engineering Department, Faculty of Marine Technology, ITS. Scaled model 1 : 10. The bag was made in shapes, B1 and B2. Sand bags were prepared with the slope 1 : 1.5 and 1 : 2,0, width of top was 60 cm. The waves were regular waves, period of 1.5 seconds. The wave height was adjusted with the level of stability sand bags. It showed that the response of the sandbag was influenced by interlocking between sandbags. As a result, the stability depended on the change of wave forces, as a consequence of the change of slope and cross areas due to sandbags shape and formation type.
Perilaku Deformasi Pemecah Gelombang Kantong Pasir Tipe Tenggelam Fatnanta, Ferry; Pratikto, Widi Agoes; Armono, Haryo Dwito; Citrosiswoyo, Wahyudi
Jurnal Teknik Sipil Vol 18, No 2 (2011)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1718.4 KB)

Abstract

Abstract. Breakwater is one of coastal structures to overcome problems of abrasion. Due to difficulties in obtaining rock material at the coast area, so the using of sandbags as a breakwater providing advantages in utilizing local materials. Therefore, the problem of the rock material supply can be overcome. The environmentally oriented conservation of the coastal protection is necessarily built without damaging the beauty of the coast itself. That is why this research on behavior of the stability of submerged sandbag breakwater is carried out this experimental research conducted in 2-D physical model and take place on the flume tank of Laboratory Ocean Engineering Department, ITS Surabaya for stability test, it shows that the deformation of the sandbags is influenced by the elasticity of sandbags which depends on its dimension and density. The sandbags size influences the grip zone. As a result, the deformation of sandbag depends on the wave forces, as a consequence of the change of slope and cross areas due to sandbags shape and formation type. The formation of SK1 has relatively high stability; the structure with mild slope is more stable, and the sandbag shapes B1 more stable than B2 Abstrak. Pemecah gelombang merupakan salah satu struktur pantai yang digunakan untuk mengatasi permasalahan abrasi. Namun sering sulit ditemukan material batuan di lokasi tersebut, maka penggunaan kantong pasir sebagai pemecah gelombang menguntung karena menggunakan material lokal. Sehingga permasalahan suplai material batuan dapat terselesaikan. Pengaman pantai yang berwawasan lingkungan sangat diperlukan untuk mengamankan pantai tanpa merusak pemandangan pantai. Oleh sebab itu penelitian ini melakukan studi mengenai perilaku stabilitas pemecah gelombang kantong pasir tipe tenggelam.Penelitian ini berbentuk pengujian model fisik 2-D skala lab, yang dilakukan di Flume Tank Laboratorium Jurusan Teknik Kelautan, ITS Surabaya. Pada uji stabilitas menunjukkan bahwa respon kantong pasir dipengaruhi oleh elastisitas kantong pasir, sedangkan elastisitas kantong pasir tergantung pada dimensi kantong dan kepadatan kantong. Ukuran kantong berpengaruh terhadap zona jepitan, dimana zona jepitan ini dipengaruhi oleh perbandingan panjang dan tebal kantong. Perilaku deformasi kantong pasir tergantung pada elastisitas kantong. Sesuai hasil pengujian, deformasi kantong pasir tergantung pada gaya yang bekerja pada kantong, jadi deformasi kantong dipengaruhi oleh kemiringan dan luas penampang kantong, sebagai akibat perubahan bentuk kantong dan jenissusunan. Jenis susunan SK1 mempunyai stabilitas relatif tinggi; struktur dengan kemiringan landai lebih stabil, dan bentuk kantong B1 lebih stabil dibandingkan bentuk B2 untuk susunan yang sama.
PERMODELAN KOEFISIEN GELOMBANG TRANSMISI PADA PEMECAH GELOMBANG KANTONG PASIR TIPE TENGGELAM Fatnanta, Ferry
Jurnal Teknik Sipil Vol 12, No 3 (2013)
Publisher : Program Studi Teknik Sipil Fakultas Teknik Universitas Atma Jaya Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (352.844 KB) | DOI: 10.24002/jts.v12i3.629

Abstract

Terdapat beberapa kondisi dan permasalahan pada teknik pantai yang tidak dapat diselesaikan dengan analisa matematika. Salah satu cara mengatasi permasalahan tersebut dengan penggunaan perumusan empiris. Model fisik merupakan metoda untuk memahami karakter hidrodinamis. Hubungan antara gelombang transmisi dan variabel pengujian dapat dimodelkan secara empiris. Untuk mewujudkan model tersebut diperlukan suatu alat (tool). Sesuai dengan karakter hubungan gelombang transmisi terhadap struktur pemecah gelombang kantong pasir, pada penelitian ini digunakan analisa regresi sebagai tool. Pada pemecah gelombang kantong pasir, nilai Dn50 relatif konstan, sehingga variabel tersebut tidak dapat dijadikan variabel pengujian. maka bentuk dan susunan kantong, lebar puncak, kemiringan susunan dan freeboard merupakan parameter yang dapat dijadikan sebagai variabel pengujian. Hasil uji statistik menunjukkan bahwa ç - 1÷ model  tak  linear  lnæ 1      öè Kt     ømerupakan model  yang cocok untuk  menggambarkan karaktergelombang transmisi pada pemecah gelombang kantong pasir tipe tenggelam.
Simulasi Perubahan Garis Pantai Teluk Belitung Kabupaten Kepulauan Meranti Menggunakan Program Genesis Herli Fajri; Ferry Fatnanta; Sigit Sutikno
Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Vol 1, No 1 (2014): Wisuda Februari Tahun 2014
Publisher : Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains

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Abstract

Teluk Belitung beach is located on the outer side of Asam strait that relate directly to Malacca strait and South China sea. It causes the ocean waves directly on the shoreline that pose an enough serious problem of shoreline change along the coastline. For it, necessary to study about the shoreline changes that occur coastline. This study was conducted using GENESIS program for simulate shoreline changes that will occur within a period of 5 years, 10 years and 15 years ahead. The data used to perform simulations using GENESIS  program is coastal bathymetry, winds, waves, soil properties of coast land and ocean currents and tides data. Simulation results obtained  from the increase in value of the shoreline changes that occur in the form of accretion and erosion along coastlines. Five-years results of the simulation time showed maximum shoreline change reaches 26,1 meters, which increases the simulation time of 10-years to reach 52,1 meters and at the simulation time 15-years to reach 78 meters. Analysis results of simulation results obtained the main factors that affecting the magnitude of shoreline change is occured. The soil  properties of coastal land has a grain size and cohesion of little value, so that when the waves come to the shore will be easiliy eroded coastal cliffs and carrying granules are eroded.  Keywords: shoreline change, accretion, erosion, GENESIS
Co-Authors ', Muhardi . Zulfan Abdul Halim Muqorrobin Abdullah Ihsan Alkubuwi Adi, Sapria Adnan Ruziq Ihsan Agus Ika Putra Aisyah Putri Albajili, Farian Alfian Alfian Andius Dasa Putra Aras Mulyadi Aras Mulyadi Ari Sandhyavitri Arief Rahman Arifan Farhan Ariza, Ariza Azizah . Azra Zulnasari Bramson P Manik, Bramson P Charles AN Daniel Irfan Dede Subhan Dodi Pratama Doris Ade Widyarti Effendi Sianipar Ela Fitriana Endala Siboro Epi Mili Yanti Erwin Satria Anugrah Fadel Muhammad Fadhilah, Randy Fadlan Fadlan Fajrian Saddek Fauzan Hidayattullah FERI SETIAWAN Fikri Ananda Fikri Hidayat Frimadofi Frimadofi Galang Maulana Gina Purnama Sari Giri Prayoga Gunawan Wibisono Gustika, Rani Ardeylina Hadiyan Putra, Hadiyan Haryo Armono Haryo Armono, Haryo Haryo Dwito Armono Haryo Dwito Armono Hengki Tornando Herli Fajri Himmatul Azizah Ihsan, Adnan Ruziq Imam Hanafi Imam Suprayogi Imam Suprayogi Irfan Hasan Joshua, Norman Julperizal, Julperizal Khairatu Zaro Lembasi, Muhammad Khadafi Lingga Panji Subrata, Lingga Panji Lisa Trisnawati M Faizal Alridho M. Yusa Manyuk Fauzi Mufriadi Mufriadi Muhamad Yusa Muhamad Yusa Muhamad Yusa Muhamad Yusa Muhamad Yusa Muhammad Faisal Al Ridho Muhammad Faizal Alridho Muhammad Iqbal Muhammad Khadafi Lembasi Muhammad Naufal Muhammad Rico Saputra Muhammad Safrianda Muhammad Yevizal Muhammad Yusa Muhardi Muhardi Muhardi Mukhelnalis Sutazril Ongko, Andarsin Parlan, Parlan Prayogo, Giri Rafika Rani Zainuddin Rahman, Sayful Ralan Ditra Remon Muslim Riady, Azhar Rinaldi Rinaldi Rio Hidayat Rizqi Yuliana Robi Handi Putra Ronny Tigor Sitanggang S A Nugroho Said Defri Ariandi Sapria Adi Saputra, Adetia Satibi, Syawal Satibi, Syawal Sayoga, Davin Sigit Sutikno Simanjuntak, Lambok Jadiaman Soewignjo Agus Nugroho Sofyan Subhan, Dede Suhaimi Siregar Suratman Suratman Suryadi Ramadhan Syawal Satibi Syawal Satibi Syawal Satibi Syawal Satibi Tiara Mahardika Trimaijon Trimaijon Trimaijon, Trimaijon Unzi Marwan Usman M Tang Usman M Tang Usman, Fauzan Vebrian Anggara Wahyudi Citrosiswoyo Wahyudi Citrosiswoyo Wahyudi Citrosiswoyo Widi Agoes Pratikto Widi Agoes Pratikto Widi Pratikto Widi Pratikto, Widi Wulan Sri Rahayu Wulandari, Deny Yolanda Widyan Yoyon Kurniawan Yusa, M. Yusa, Muhammad Zambika, Rio Zoni Satria Zulkarnaini Zulnasari, Azra