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All Journal Jurnal Teknik Lingkungan Jurnal Teknik Sipil Civil Engineering Dimension Jo-ELT (Journal of English Language Teaching) Fakultas Pendidikan Bahasa dan Seni Program Studi Pendidikan Bahasa Inggris IKIP Journal of Innovation and Technology
Dyah Kusumastuti
Kelompok keahlian Rekayasa Struktur, Program Studi Teknik Sipil, Fakultas Teknik Sipil dan Lingkungan, Institut Teknologi Bandung, Jl. Ganesa No.10 Bandung.
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Education Electrical & Electronics Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Mechanical Engineering

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Analisis Numerik Link Panjang dengan Penambahan Pelat Sayap Tepi terhadap Peningkatan Kinerja Struktur Rangka Baja Berpengaku Eksentrik Musbar, Musbar; Budiono, Bambang; Setio, Herlien D.; Kusumastuti, Dyah
Jurnal Teknik Sipil Vol 22, No 1 (2015)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (527.391 KB) | DOI: 10.5614/jts.2015.22.1.1

Abstract

Abstrak. Mengantisipasi kerusakan bangunan akibat gaya gempa, banyak model konstruksi bangunan yang terus dikembangkan dan diteliti hingga sekarang, salah satunya struktur bangunan rangka baja berpengaku eksentrik yang menggunakan elemen link sebagai bagian elemen struktur yang berfungsi untuk menyerap energi gempa. Kegagalan pada link panjang yang lebih dominan disebabkan oleh momen menyebabkan terjadinya kegagalan yang lebih awal akibat fraktur dan tekuk pada zona di ujung – ujung link terutama pada sayap. Untuk mengatasi kegagalan awal yang lebih cepat, maka dilakukan inovasi dengan menambah pengaku sayap pada tepi link. Penambahan pelat pengaku sayap tepi pada link panjang mempunyai beberapa keuntungan diantaranya; kemudahan dalam pengerjaan dan pengelasan yang minimal sehingga mengurangi pengaruh tegangan sisa akibat proses pengelasan. Penelitian ini mengkaji secara numerik dengan menggunakan perangkat lunak MSC Nastran/Patran terhadap kinerja link panjang untuk beberapa variasi model link yang dianalisis. Parameter yang dianalisis meliputi variasi yaitu: panjang link, penambahan pelat sayap tepi beserta konfigurasi pemodelannya, tebal pelat dan kombinasi dengan pengaku badan vertikal. Hasil analisis pada model modifikasi penambahan pelat pengaku tepi dapat meningkatkan kinerja link panjang dibandingkan dengan model link standar pada variabel : daktilitas, kekuatan, disipasi energi dan kekakuan.Abstract. Conducting research in anticipating earthquake damage at building has been developed continuosly. One of it is Eccentrically Braced Frame (EBF) for steel frame. EBF uses link element to absorb earthquake energy. Failure at long type link dominantly is caused by moment which make early failure because of fracture and buckling at the end of link such as in its flange. To tackle the early failure, stiffener at the end of the link has been added. The advantages of it are making easy of workmanship and minimizing the welding effort which can reduce residual stress because of welding process. This study does numerical study by using MSC Nastran/Patran program to measure the performance of long type link for several analysis types. Several parameters have been analyzed such as the length of the link, the edge addition of flange plate with its modeling configuration, the width of the plate, and the combination with vertical body stiffener. This study found that the addition of stiffener at the end of the link has increased the performance of long type link. Finally, the findings of this study are compared with that of standard link model. The variables that are compared between both of long type link and standard link are ductility, strength, energy dissipation and stiffness.
Kuantifikasi Besaran dan Distribusi Tegangan Sisa Daerah Pertemuan Pengaku-Badan-Sayap pada Elemen Link Struktur Rangka Baja Berpengaku Eksentrik (SRBE) dengan Metode Difraksi Neutron Kurdi, Kurdi; Budiono, Bambang; Moestopo, Muslinang; Kusumastuti, Dyah; Muslih, M. Refai
Jurnal Teknik Sipil Vol 23, No 1 (2016)
Publisher : Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2683.031 KB) | DOI: 10.5614/jts.2016.23.1.2

Abstract

Abstrak. Penelitian ini menfokuskan kajian secara eksperimental terhadap besaran dan distribusi tegangan sisa yang dihasilkan dari proses pengelasan di dan sekitar daerah k dari elemen link. Pengukuran dilakukan dengan Metode Difraksi Neutron menggunakan alat Difraktometer Neutron DN1-M PSTBM BATAN. Sebanyak 15 titik dengan 45 arah pengukuran dilakukan di daerah k dalam arah normal, transversal maupun longitudinal. Hasil eksperimen menunjukkan besaran tegangan sisa tarik sebesar 185 Mpa dan 160 Mpa dalam arah longitudinal dan transversal searah weld toe pengelasan antara badan dan sayap dengan luasan daerah tarik 8 kali dari tebal flange. Untuk pengelasan tegak lurus weld toe diperoleh tegangan sisa tarik sebesar 162 Mpa dan 145 Mpa dalam arah longitudinal dan transversal dengan luas daerah tarik 4 kali dari tebal flange. Besarnya tegangan sisa tarik dan lebarnya daerah tarik mengindikasi daerah k merupakan daerah rawan terjadinya awal dari crack yang dapat menurunkan kinerja dari link. Membuat gap pengelasan antara pengaku dengan flange selebar 4 s/d 5 kali tebal flange dapat meningkatkan kinerja dari link karena dapat meminimalkan besaran dan distribusi tegangan sisa tarik. Abstract. This research focused on the experimental study on the residual stress magnitude and distribution resulted from the welding process in and around the k area of the link element. The measurement was done with the Neutron Diffraction Method using the Neutron Diffractometer DN1-M PSTBM BATAN. A number of 15 points with 45 measurement directions were conducted on the k area in normal, transversal and longitudinal directions. The result of the experiment showed 185 Mpa and 160 Mpa residual stress magnitude in longitudinal and transversal directions in the same directions with the weld toe welding between the web and flange with the extent of the stress area 8 times of the flange thickness. The perpendicular welding of the weld toe resulted in 162 Mpa and 145 Mpa residual stresses in longitudinal and transversal directions with 4 times stress area extent from the flange thickness. The residual stress magnitude and the width of stress area indicated the k area as a vulnerable area to the initial crack occurrence, which may decrease the link performance. Making a welding gap 4 to 5 times of the flange thickness between the stiffeners and the flange may increase the link performance because it may minimize the residual stress magnitude and distribution.
CONCEPT MAP STRATEGY TO ORGANIZE IDEAS IN WRITING EXPOSITION TEXT Kurniati, Efi; Kusumastuti, Dyah
Journal of English Language Teaching Vol 6, No 1 (2019)
Publisher : IKIP Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (434.336 KB)

Abstract

The purpose of this research was to find out the effectiveness of concept map to organize ideas in writing exposition text. This research was conducted in one senior high school in Purwokerto in academic year 2018/2019. The population was all the eleventh grade students in that school. Researcher used two classes as control group and experimental group. This research used quasi experimental research which was done in November 2019. The instrument of collecting data was tested. The test was done twice which called pre-test and post-test. The type of the test was writing test. T-test formula was used to analyze the data. Based on the computation, t-test result was 3.535 and the t-table was 1.677 at significant level 0.05 with the degree of freedom 48. It showed that t-result was higher than t-table. Based on the research result, it can be concluded that concept map was effective to organize ideas in writing exposition text.
PENGARUH FLUKTUASI SALINITAS TERHADAP NITRIFIKASI OLEH BEKTERI YANG DIAMBIL PADA MUARA SUNGAI BANJIR KANAL TIMUR Bintang Dyah Kusumastuti
Jurnal Teknik Lingkungan Vol 2, No 1 (2013): Jurnal Teknik Lingkungan
Publisher : Departemen Teknik Lingkungan Fakultas Teknik Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (632.914 KB)

Abstract

This research is taken by sample of Banjir kanal Timur. It is conducted by research in order to know the effect of fluctuations in salinity on nitrification, in this research, separating ammonium is conducted by  giving variations of salinity content which is different on each bacteria and reactor. It would be returned to the source of orifice, that is 0,5% of the result. In high salinity, bacteria cannot degrade  ammonium fast, but it can be fast if when it is returned to the source salinity, so by that experiment, we can say characteristic of salinity toxic is temporary in process separating ammonium. In even 0%-3% salinity, bacteria can degrade ammonium well so bacteri which is taken of banjir kanal Timur can be applied to recycle waste which has 0%-3% salinity fluctuation.
METHODOLOGY OF SITE-SPECIFIC SEISMIC HAZARD ANALYSIS FOR IMPORTANT CIVIL STRUCTURE Masyhur Irsyam; Donny T. Dangkua; Dyah Kusumastuti; Engkon K. Kertapati
Civil Engineering Dimension Vol. 9 No. 2 (2007): SEPTEMBER 2007
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (511.566 KB) | DOI: 10.9744/ced.9.2.103-112

Abstract

Note from the Editor The Indonesian archipelago is one of the most active tectonic zones in the world. Therefore to design an important (and dangerous) structure such as a nuclear power plan knowledge of the seismicity of the site is very important. This could be achieved by doing a site-specific seismic hazard analysis. A site-specific seismic hazard analysis is required in the design state in order to determine the recommended seismic design criteria of the structure. A complete and thorough explanation of the methodology to do a site-specific seismic hazard analysis is presented in this Technical Note Abstract in Bahasa Indonesia :
Proposed Site-Specific Response Spectra for Surabaya-Madura Bridge Masyhur Irsyam; Donny T. Dangkua; Hendriyawan Hendriyawan; R. Bambang Boediono; Dyah Kusumastuti; Engkon K. Kertapati
Civil Engineering Dimension Vol. 10 No. 2 (2008): SEPTEMBER 2008
Publisher : Institute of Research and Community Outreach - Petra Christian University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1049.228 KB) | DOI: 10.9744/ced.10.2.pp. 70-81

Abstract

This paper presents a site-specific seismic hazard study to determine the recommended seismic design criteria for Suramadu Bridge. The study is performed using probabilistic seismic hazard approach to determine maximum acceleration and response spectra at bedrock and followed by local site effect analysis to determine maximum acceleration and response spectra at ground surface. The probabilistic seismic hazard analysis (PSHA) is carried out using 3-dimension (3-D) seismic source models (fault source model). Two hazard levels are analysed to represent 150 and 3,300 years return period of ground motion around site location. The local site effect analysis is performed using 1-dimension (1-D) shear wave propagation theory to obtain peak ground acceleration and response spectra at ground surface. Finally, the site-specific surface response spectra with 5 percent damping are developed based on the mean plus one standard deviation concept from the result of local site effect analysis.
Time Lag Application on Correlation Analysis among the national and international agencies for the rainfall data of Lampung Province, Indonesia Lintang Kurnia Aridini; Ahmad Zakaria; Dyah I Kusumastuti; Ahmad Herison; Endro P Wahyono
Jurnal Inovasi Teknologi Vol 3 No 2 (2022): October
Publisher : Engineering Forum of Western Indonesian Government Universities Board (Forum Teknik, BKS-PTN Wilayah Barat) Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31629/jit.v3i2.5060

Abstract

The rainfall data in Lampung tends to be small and cannot represent a large location, so other sources of rainfall data are needed that can be used. One of them is TRMM on that basis it is deemed necessary to see the correlation of the TRMM and BMKG data. The purpose of this research is to analyze how big the correlation between TRMM data and BMKG data with Time Lag. And its Predictability, as well as improved correlation with Time Lag. The method used in this study is the Pearson correlation. The result of this research is that the biggest correlation is on H0 and H+1 for the highest daily cumulative 0.3376 - 0.4808, for cumulative 2 days at 0.417- 0.555, for cumulative 7 days 0.569 - 0.706, for cumulative 15 days at 0.612 - 0.785 and cumulative 30 daily 0.710 -0.811 the conclusion of this study is that TRMM and BMKG have a better correlation on H + 1 and (H0), the results of linear regression analysis with Time Lag concluded that the predictive ability of the data is better on Time Lag and the difference in correlation between H + 1 and H0 obtained an increase in the correlation value. declared to have increased 0.01 - 0.2).
Co-Authors Ahmad Herison Ahmad Zakaria Budiono, Bambang Budiono, Bambang Donny T. Dangkua Donny T. Dangkua Endro P Wahyono Engkon K. Kertapati Engkon K. Kertapati Friday Fitricia Nur, Friday Fitricia Hendriyawan, Hendriyawan Kurdi, Kurdi Kurniati, Efi Lintang Kurnia Aridini Masyhur Irsyam Musbar, Musbar Muslih, M. Refai Muslinang Moestopo R. Bambang Boediono Setio, Herlien D.