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All Journal Teknisia Teras Jurnal JOURNAL OF CIVIL ENGINEERING, BUILDING AND TRANSPORTATION
Anggit Mas Arifudin
Universitas Islam Indonesia
Civil Engineering, Building, Construction & Architecture Engineering Environmental Science

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KECEPATAN GELOMBANG GESER (VS) DAN KETEBALAN SEDIMEN (H) DI KABUPATEN KLATEN DARI DATA MIKROTREMOR Anggit Mas Arifudin
TEKNISIA Vol. XXVI, No. 1, Mei 2021
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol26.iss1.art6

Abstract

Research on Shear Wave Velocity (vs) and Sediment Thickness (h) in Klaten Regency, Central Java from field microtremor data aims to determine the thickness of sediment or soft sediment as one of the factors of high and low earthquake vulnerability. Microtremor data was collected using a three-component TDS 303 seismometer, covering 111 measuring points in the Klaten Regency area. In this study, the sediment thickness was calculated using the equation shear wave velocity (vs) divided by four times the dominant frequency (fg). The dominant frequency (fg) value is obtained from the HVSR curve while the shear wave velocity value (vs) used in this study is the inversion value of the HVSR curve which is modeled based on borlog data at the Wedi Church, equated for all measurement points. On the map of the shear wave velocity distribution at each microtremor measuring point has a vs value, this value is used to calculate the thickness of the sediment at each point. So that the distribution of the thickness value of the sediment at each point is obtained, then a thickness map is made covering the study area. The results showed that in general the research area has a Vs value in the results of the HVSR curve inversion ranging from 130 m/s to 570.83 m/s, Vs average 275.68 m/s. The areas with vs are relatively high in the southern part of Gantiwarno, Wedi, and Bayat subdistricts that are directly adjacent to the hills of Gunung Kidul. Areas with relatively low value vs are in the area of Prambanan Subdistrict, Northern Wedi Subdistrict, Trucuk Subdistrict, Jogonalan Subdistrict, South Klaten District, Central Klaten District, and Kalikotes Subdistrict. For sediment thickness (h) ranges from 5,105 m to 113,648 m. Areas with relatively high sediment thickness are located in parts of Wedi Subdistrict with a thickness of up to 110 m.  Areas with medium thickness (around 60 to 90 m) are in the area of Gantiwarno sub-district, Prambanan district, and the southern part of the Jogonalan sub-district. In the area of Bayat District it has a low thickness (about 5 to 30 m) located in the proves and mountains of the Paseban area and the tomb of Sunan Pandanaran. This shows that areas with high sediment thickness, namely in Wedi District, will also have a high level of earthquake vulnerability.
RASIO KEKAKUAN LENTUR (FLEXURAL STIFFNESS RATIO) ELEMEN BETON AKIBAT GEMPA BERDASARKAN ANALISIS DINAMIK STRUKTUR SINGLE DEGREE OF FREEDOM (SDOF) Widodo Pawirodikromo; Anggit Mas Arifudin; Dewi Ayu Harjani
TEKNISIA Vol. XXVI, No. 2, November 2021
Publisher : Jurusan Teknik Sipil, Fakultas Teknik Sipil dan Perencanaan, Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/teknisia.vol26.iss2.art6

Abstract

Modeling the effective stiffness of reinforced concrete elements for structural analysis is an important problem and needs to be solved. The effective stiffness is then expressed in terms of the average flexural stiffness ratio Ck. whose value has been determined by Codes. Previous studies have shown that the stiffness ratio is assumed/stated to be strength-dependent. Based on this statement, research on the flexural stiffness ratio Ck of reinforced concrete elements through dynamic analysis of the SDOF structure was carried out. The SDOF structural model used has a vibration period T = 0.48 sec. The dynamic load used is 50 earthquake records consisting of 3-groups of frequency content (low, moderate, high). The dynamic analysis that was carried out has accommodated the inelastic responses whose behavior follows Modified Takeda hysteretic loops. The study results showed that the maximum response of the structure generally occurred in the strong middle part of the earthquake recording or the period of the effective duration of D595. The main finding in this study is that the strength dependent of flexural stiffness is proven. The relationship between the average flexural stiffness ratio Ck and peak ground acceleration of PGA can be mathematically expressed in the equation Ck = -0.981.PGA + 0.822. The relationship is negative, meaning that the higher the PGA value, the smaller the Ck value with a correlation coefficient of R = 0.635 (moderate correlation). The Ck value negatively correlates with the drift ratio and damage index, DI.
Analysis of Sika Cim Additive Material Proportion In Beam-Column Joint for Fabricated House Anggit Mas Arifudin; Setya Winarno
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 7 No. 2 (2023): JCEBT SEPTEMBER
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v7i1.9054

Abstract

The design compressive strength (f’c) is 21,7 Mpa / K250 and the chemical liquid was used is Sika Cim.  Variation of Sika Cim adding that used is 0%; 0,3%; 0,5%; 0,8%; 1%; and 1,2% toward the weight of cement used. The each variation consists of 3 sample with 2 sample that will be at compressive strength tested at the age of 7 days, and 2 sample for compressive strength control that tested at the age of 28 days. From these all variations of Sika Cim adding, the optimum point for connection material can be founded and then it will used to fabricated house panel assembling which analise damage model of the connection. Then calculating the cost that used to make connection with the optimum Sika Cim adding, and then compare it with the cost of normal concrete with same quality. From this study can be founded that level of optimum Sika Cim is 2263,54 ml or 0,52% from the cement which used for 1 m3 volume of the concrete.. Level of Sika can increase 11,8 MPa of compressive strength or 58,38% from the normal concrete without Sika Cim. Sika Cim using at K200 concrete to produce K250 concrete is 1182,219 ml/m3, with 7,48% cost from total cost for each K200 readymix concrete. This Sika Cim adding can economize the cost for about Rp. 51.397,67 for each m3 concrete. The composition of the mixture with the optimum Sika Cim applied to the precast column beam connection material, produces a joint that has a good crack pattern.
Evaluation Of Building Vulnerability With Microtremor Data (Case Study Of FTI UII Lecture Building): Indonesia Wishal Dinansyah Suleman; Anggit Mas Arifudin
JOURNAL OF CIVIL ENGINEERING BUILDING AND TRANSPORTATION Vol. 9 No. 1 (2025): JCEBT MARET
Publisher : Universitas Medan Area

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31289/jcebt.v9i1.13158

Abstract

Beragamnya fungsi penggunaan bangunan saat ini memerlukan perancangan yang dapat meminimalisir potensi kerusakan, terutama yang disebabkan oleh bencana alam. Gempa bumi merupakan salah satu bencana alam yang menjadi ancaman utama terhadap kerusakan bangunan. Sebagai contoh, peristiwa gempa bumi yang terjadi di Yogyakarta pada tahun 2023 menimbulkan kerusakan pada berbagai fasilitas bangunan. Penelitian ini bertujuan untuk mengidentifikasi tingkat kerentanan bangunan dengan menggunakan data mikrotremor untuk memperoleh nilai frekuensi natural bangunan (fb), indeks resonansi bangunan (R), dan indeks kerentanan bangunan (Kb). Penelitian dilakukan pada gedung perkuliahan FTI UII dengan menggunakan alat Lunitek Digital Seismic Sensor untuk merekam getaran mikrotremor. Metode Floor Spectral Ratio (FSR) diterapkan untuk menganalisis mikrotremor pada bangunan, sementara metode Horizontal to Vertical Spectral Ratio (HVSR) digunakan untuk menganalisis mikrotremor pada tanah. Hasil penelitian menunjukkan bahwa kerentanan bangunan berdasarkan nilai frekuensi natural bangunan teridentifikasi aman, sedangkan nilai indeks resonansi bangunan menunjukkan tingkat kerentanannya yang tinggi. Selain itu, nilai indeks kerentanan bangunan juga menunjukkan kondisi yang aman. Selisih terbesar antara perbandingan frekuensi data mikrotremor dan SAP2000 ditemukan pada blok C sebesar 0,401 Hz dan pada blok D sebesar 0,616 Hz.
Evaluasi Keretanan Bangunan Berdasarkan Metode Floor Spectral Ratio Dengan Perekaman Mikrotremor Arifudin, Anggit Mas; Suleman, Wishal Dinansyah
Teras Jurnal : Jurnal Teknik Sipil Vol. 15 No. 2 (2025): Teras Jurnal (September)
Publisher : UNIVERSITAS MALIKUSSALEH

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/tj.v15i2.1277

Abstract

Abstrak   Yogyakarta merupakan daerah yang terletak di dekat pertemuan lempeng Eurasia dan Indo-Australia, sehingga berpotensi tinggi terhadap aktivitas tektonik yang dapat memicu gelombang seismik di permukaan tanah. Gelombang ini dapat membahayakan kestabilan bangunan yang ada di atasnya. Penelitian ini bertujuan untuk mengidentifikasi tingkat kerentanan struktur bangunan terhadap gempa bumi melalui analisis data mikrotremor yang merekam getaran alami bangunan. Studi dilakukan pada gedung Fakultas Teknik Sipil dan Perencanaan Universitas Islam Indonesia, dengan 46 titik perekaman di dalam bangunan dan 2 titik referensi di tanah. Data mikrotremor diolah menggunakan perangkat lunak Geopsy untuk memperoleh nilai frekuensi dominan dan amplitudo. Metode Floor Spectral Ratio (FSR) digunakan untuk menganalisis bangunan, sedangkan metode Horizontal to Vertical Spectral Ratio (HVSR) untuk analisis tanah. Hasil penelitian menunjukkan bahwa beberapa bagian bangunan memiliki frekuensi natural yang mendekati frekuensi tanah, meningkatkan potensi resonansi. Nilai indeks resonansi tergolong sedang hingga tinggi, sementara indeks kerentanan secara umum menunjukkan bahwa gedung berada pada tingkat risiko kerusakan yang rendah terhadap getaran gempa.   Kata kunci: Mikrotremor, FSR, HVSR, Frekuensi, Indeks Resonansi, Indeks Kerentanan     Abstract   Yogyakarta is located near the convergence of the Eurasian and Indo-Australian plates, making it highly vulnerable to tectonic activity that can generate seismic waves on the ground surface. These waves pose a threat to the stability of buildings. This study aims to assess the vulnerability level of building structures to earthquakes by analyzing microtremor data that records the building's natural vibrations. The research was conducted on the Faculty of Civil Engineering and Planning building at Universitas Islam Indonesia, using 46 recording points inside the building and 2 reference points on the ground. Microtremor data were processed using Geopsy software to obtain dominant frequency and amplitude values. The Floor Spectral Ratio (FSR) method was used for building analysis, while the Horizontal to Vertical Spectral Ratio (HVSR) method was applied for ground analysis. The results show that several parts of the building have natural frequencies close to the ground frequency, increasing the potential for resonance. The resonance index values range from moderate to high, while the overall vulnerability index indicates a low risk of structural damage due to seismic vibrations.   Keywords: Microtremor, FSR, HVSR, Frequency, Resonance Index, Vulnerability Index
Co-Authors Dewi Ayu Harjani Setya Winarno Suleman, Wishal Dinansyah Widodo Pawirodikromo Wishal Dinansyah Suleman