27 research outputs found
Studi Eksperimental terhadap Parameter Daktilitas Struktur Baja
Get PDFAbstrak. Makalah ini menyajikan studi eksperimental terhadap daktilitas struktur baja berupa portal sederhana dengan tujuan meneliti parameter-parameter yang berpengaruh terhadap daktilitas struktur baja, dan melakukan validasi terhadap usulan formula daktilitas struktur yang sedang dikembangkan melalui studi numerik. Sebelum dilakukan pengujian di Laboratorium terlebih dahulu dilakukan penelusuran teori-teori serta data-data dari hasil-hasil penelitian sebelumnya. Selanjutnya dilakukan simulasi komputer dengan menggunakan paket program analisis nonlinier MSC/NASTRAN untuk mengetahui parameter-parameter yang berpengaruh secara signifikan terhadap daktilitas struktur portal baja sederhana. Hasil penelitian menunjukkan bahwa properti penampang (bf/2tf, h/bf), perbandingan tinggi kolom struktur dengan tinggi profil (H/h), serta tinggi kolom dengan lebar bentang struktur (H/L) merupakan parameter yang sangat berpengaruh terhadap nilai daktilitas. Validasi terhadap formula daktilitas yang diusulkan melalui studi numerik menunjukkan bahwa hasil numerik lebih bersifat konservatif, namun hasil analisis numerik dan eksperimen menunjukkan pola kurva daktilitas yang sama.Abstract. This paper presents experimental study of ductility parametric of steel structure. The purpose of this research to investigate the parametric influencing ductility of steel structure and to validate ductility formula obtained from numerical study. For this purpose, experimental data and modeling of specimen obtained from previous study and through simulation by nonlinear program MSC/NASTRAN. The result of investigation shows that: behavior of cross section (bf/2tf, h/bf), ratio height and width of structure (H/L) have great influence on the available ductility of steel structure. Validation of ductility formula show that the ductility the ductility value by experimental study is higher than numerical study, but the curve of ductility ratio shows the same behavior between experimental and numerical result
Kajian Eksperimental Bresing Tahan Tekuk Pada Bangunan Tahan Gempa Di Indonesia
Get PDF. Buckling-restrained brace frame is developed from concentrically-braced frame. Buckling restrained brace is the major seismic energy dissipating element that expected to yield in its entire steel core. Experimental work was carried out on three brace specimens with PVC pipe and mortar diameter variations. Quasi-static loading with displacement control was applied to each brace until its failure. The 216-mm diameter brace shows the best performance on its strength, hysteretic curve and backbone curve. Several failures are observed from specimens on uncontrolled-steel-core-yielding behavior and limited buckling-restrained mechanism ability
Applications of vertical steel pipe dampers for seismic response reduction of steel moment frames
Get PDFA newly developed vertical steel pipe damper is introduced to improve the seismic performance of steel moment frames. The damper exhibits large lateral stiffness and excellent capability to dissipate energy
due to earthquakes. It provides a reliable, compact, inexpensive, and replaceable damper. Improved performance of the structure is verified analitically using a four-story steel moment frame equipped with steel pipe
dampers. Vertical steel pipe dampers are placed between any two points where large relative motion exists during earthquake excitation. A nonlinear dynamic analysis of the structure using PERFORM-3D software
demonstrated the significant benefit of equipping the structure with steel pipe dampers. All structural components, except the steel pipe dampers, remain elastic during earthquake excitation. Structures properly designed with vertical steel pipe dampers will only require minimum postearthquake inspection and limited
damage.
Some practical issues associated with the application of
vertical steel pipe dampers to building structure for
seismic response reduction are presented in this paper
KAJIAN NUMERIK DAN EKSPERIMENTAL PADA STRUKTUR DENGAN CORE FRAME MENGGUNAKAN COUPLING BEAM DAN REPLACEABLE LINK
No full textAbstrak
Kinerja link pada struktur core rangka baja dengan balok perangkai dan link pada bangunan bertingkat 10 dibahas melalui kajian numerik dan eksperimental. Kajian numerik dilakukan dengan analisis non-linier statik dan dinamik terhadap sejumlah link dengan variasi panjang, tebal pelat sayap, dan tebal pelat badan; dengan mempertahankan elemen struktur core frame lainnya tetap elastik. Hasil kajian terhadap kekakuan, kekuatan, daktilitas, disipasi energi, dan mekanisme kelelehan struktur core menunjukkan penggunaan link geser pada struktur core dengan penebalan web memberikan kelebihan dibandingkan dengan penggunaan link lentur, dan menunjukkan kemampuan memikul gaya geser gempa yang tidak banyak berkurang dibandingkan struktur core tanpa link. Kajian eksperimental berupa pembebanan siklik terhadap sistem core rangka baja dengan balok perangkai dan link geser yang dapat diganti, menunjukkan link geser dengan penebalan pelat badan memberikan kinerja seismik yang lebih baik.
Kata Kunci : Link yang dapat diganti, link geser, balok perangkai, struktur core rangka baja, kinerja seismik
Abstract
Numerical and experimental work are conducted to study the performance of steel core frame with coupling beam and link of a 10th story building. Non-linear static and dynamic analyses are carried out to a number of core frames with links of various length, flange thickness, and web thickness, while maintaining the other elements remain elastic. The analysis of stiffness, strength, ductility, energy dissipation, and yielding mechanism of core structure shows the advantage of shear link with increasing web thickness compared to flexural link, and shows slightly less base shear compared to core frame without link. Experimental work with cyclic loading to a half-scaled core frame with coupling beam and replaceable link shows a better seismic performance of a shear link with increasing web thickness .
Keywords: Replaceable link, shear link, coupling beam, core frames, seismic performance.
Replaceable Link merupakan sebuah istilah untuk elemen link beam yang dihubungkan oleh coupling beam pada sistem struktur core yang didesain dapat diganti jika mengalami kelelehan. Sifat inelastik struktur hanya direncanakan pada link beam, sehingga elemen lain seperti kolom dan coupling beam tetap bersifat elastik. Kajian numerik dilakukan untuk mempelajari kinerja struktur terhadap kekakuan, daktilitas, disipasi energi dan mekanisme kelelelehan. Struktur ini dianalisis dengan memvariasikan link terhadap penebalan web, penebalan flange, dan penambahan panjang. Struktur ini dibandingkan dengan struktur serupa tanpa link sebagai benchmark. Hasil studi menunjukkan struktur dengan konsep replaceable link memiliki kinerja yang baik jika direncanakan menggunakan link geser. Kinerja struktur dengan variasi penebalan web dan flange memiliki kekakuan elastik struktur yang sama dan disipasi energi meningkat, tetapi menurunkan daktilitas. Penebalan web pada link geser meningkatkan kekakuan inelastiknya. Penambahan panjang link memiliki kekakuan cenderung sama dan meningkatkan daktilitas serta disipasi energi. Struktur yang optimal sesuai konsep replaceable link memiliki kapasitas base shear maksimum mencapai 95% dari struktur tanpa link serta memiliki daktilitas dan disipasi energi yang lebih baik daripada struktur tanpa link.
Dari kajian numerik yang dilakukan terlihat variasi penebalan web pada link geser merupakan variasi yang baik karena dapat meningkatkan kekakuan dan disipasi energi serta tidak perlu merubah konfigurasi struktur. Oleh karena itu, dilakukan kajian eksperimental pada struktur ini dengan variasi tebal web pada link. Kajian eksperimental dilakukan terhadap half-scale struktur yang terdiri dari kolom, coupling beam dan link beam. Sub-assembly diuji dibawah pembebanan siklik sesuai dengan ketentuan AISC 341-10 dengan mengkonversi rotasi menjadi displacement. Inovasi dilakukan pada link beam dengan cara melakukan penebalan pada bagian web link. Link-1 digunakan profil W150x75x6x8 sedangkan untuk Link-2 digunakan penampang link dengan profil W150x75x8x8. Pengujian diamati berdasarkan displacement kontrol yang direncanakan pada kolom sub-assembly dengan pembebanan lateral melalui aktuator. Hasil pengujian menunjukan bahwa penebalan yang dilakukan pada web link terbukti dapat meningkatkan disipasi energi sebesar 47% dan kekakuan elastik link dengan presentase rata-rata sebesar 42% tanpa menyebabkan kelelehan pada elemen lain seperti kolom, coupling beam dan sambungan link
Kajian Eksperimental Peningkatan Kinerja Link Geser pada Sistem Rangka Baja Berpengaku Eksentrik
Get PDFAbstrak. Link geser pada sistem rangka baja berpengaku eksentrik (SRBE) merupakan elemen utama penyerap energi gempa yang direncanakan mengalami leleh pada seluruh pelat badannya. Kinerja link geser dengan sambungan baut yang berkurang akibat terjadinya kegagalan pada pelat sayap, diperbaiki dengan dua cara: (1) memperlebar pelat sayap pada bagian ujung link, dan (2) meningkatkan mutu pelat sayap. Kajian eksperimental dilakukan terhadap tiga buah link geser yaitu link bench-mark, link dengan pelebaran sayap, dan link dengan peningkatan mutu pelat sayap. Pembebanan siklik secara kuasi-statik dengan kontrol perpindahan dilakukan terhadap ketiga spesimen link hingga mencapai keruntuhan. Kurva histeretik yang dihasilkan menunjukkan peningkatan kinerja yang signifikan pada kedua upaya perbaikan, meliputi: kekuatan, daktilitas, dan disipasi energi.Abstract. Shear link of the eccentrically braced steel frames is the major seismic energy dissipating element which is expected to yield in its entire web. The decreasing performance of bolt-connected shear link due to failure of its flange, is improved by two methods: (1) widening the flange at link ends, and (2) increase the grade of flange. Experimental work was carried out on bench-mark link, link with wing plate, and link with flange of higher grade. Series of quasi-static cyclic loading with displacement control were applied to each link until its failure. Hysteretic curve shows increasing performance by both improvement methods, which includes: strength, ductility, and energy dissipation
Kajian Numerik Terhadap Kinerja Link Geser Dengan Pengaku Diagonal Pada Struktur Rangka Baja Berpenopang Eksentrik (EBF)
Get PDF. This paper presents a numerical study to investigate the behaviour of shear link in case of enhancement of the shear link performance of Eccentrically Braced Frames (EBF) of steel structures by using diagonal web stiffenner. This research aims to investigate the behaviour of shear link with diagonal stiffenner under monotonic and cyclic of loading with displacement control, the loading hystory is applied to the model of link accordance with standard of AISC 2005. Non-Linier Finite Element Method is applied using the computer software of MSC/NASTRAN. Link is modeled as shell element and fixed at its both ends except for degree of freedom of the vertical displacement (y-direction) at the one end where the load is applied. Several important parameters of shear link has ben investigated: the thickness of flange, web and web stiffener, the space of web stiffner, the thickness of diagonal web stiffner and its geometric. The behaviour of shear link with diagonal web stiffener is compared to the behaviour of the link designed in accordance with the AISC 2005 Standard Code of Practice. The results of the analysis show that the diagonal web stiffener increases the performance of the shear link in terms of strength, stiffness, energy dissipation to resist lateral load. However, the difference between the ductilities of the link with diagonal web stiffenner and standard link of AISC Code is not significant. Parameters which are significantly influencing the performance of the shear link are the thickness of diagonal web stiffener and its geometry
Behavior of Shear Link of WFSection with Diagonal Web Stiffener of Eccentrically Braced Frame (EBF) of Steel Structure
Get PDFThis paper presents results of numerical and experimental study of shear link behavior, utilizing diagonal stiffener on web of steel profile to increase shear link performance in an eccentric braced frame (EBF) of a steel structure system. The specimen is to examine the behavior of shear link by using diagonal stiffener on web part under static monotonic and cyclic load. The cyclic loading pattern conducted in the experiment is adjusted according to AISC loading standards 2005. Analysis was carried out using non-linear finite element method using MSC/NASTRAN software. Link was modeled as CQUAD shell element. Along the boundary of the loading area the nodal are constraint to produce only one direction loading. The length of the link in this analysis is 400mm of the steel profile of WF 200.100. Important parameters considered to effect significantly to the performance of shear link have been analyzed, namely flange and web thicknesses, thickness and length of web stiffener, thickness of diagonal stiffener and geometric of diagonal stiffener. The behavior of shear link with diagonal web stiffener was compared with the behavior of standard link designed based on AISC 2005 criteria. Analysis results show that diagonal web stiffener is capable to increase shear link performance in terms of stiffness, strength and energy dissipation in supporting lateral load. However, differences in displacement ductility's between shear links with diagonal stiffener and shear links based on AISC standards have not shown to be significant. Analysis results also show thickness of diagonal stiffener and geometric model of stiffener to have a significant influence on the performance of shear links. To perform validation of the numerical study, the research is followed by experimental work conducted in Structural Mechanic Laboratory Center for Industrial Engineering ITB. The Structures and Mechanics Lab rotary PAU-ITB. The experiments were carried out using three test specimens with model and dimension identical to the model in the numerical study. Experimental testing apparently has shown results of the same behavior as predicted in the numerical study. However, when it is compared to the shape of the hysterical curve, a slight difference is apparent. This is due to the influence of stiffness of bolt joints and the supports which is difficult to model precisely in the numerical studies.
Behavior of Shear Link of WF Section with Diagonal Web Stiffener of Eccentrically Braced Frame (EBF) of Steel Structure
No full textThis paper presents results of numerical and experimental study of shear link behavior, utilizing diagonal stiffener on web of steel profile to increase shear link performance in an eccentric braced frame (EBF) of a steel structure system. The specimen is to examine the behavior of shear link by using diagonal stiffener on web part under static monotonic and cyclic load. The cyclic loading pattern conducted in the experiment is adjusted according to AISC loading standards 2005. Analysis was carried out using non-linear finite element method using MSC/NASTRAN software. Link was modeled as CQUAD shell element. Along the boundary of the loading area the nodal are constraint to produce only one direction loading. The length of the link in this analysis is 400mm of the steel profile of WF 200.100. Important parameters considered to effect significantly to the performance of shear link have been analyzed, namely flange and web thicknesses, , thickness and length of web stiffener, thickness of diagonal stiffener and geometric of diagonal stiffener. The behavior of shear link with diagonal web stiffener was compared with the behavior of standard link designed based on AISC 2005 criteria. Analysis results show that diagonal web stiffener is capable to increase shear link performance in terms of stiffness, strength and energy dissipation in supporting lateral load. However, differences in displacement ductility’s between shear links with diagonal stiffener and shear links based on AISC standards have not shown to be significant. Analysis results also show thickness of diagonal stiffener and geometric model of stiffener to have a significant influence on the performance of shear links. To perform validation of the numerical study, the research is followed by experimental work conducted in Structural Mechanic Laboratory Center for Industrial Engineering ITB. The Structures and Mechanics Lab rotary PAU-ITB. The experiments were carried out using three test specimens with model and dimension identical to the model in the numerical study. Experimental testing apparently has shown results of the same behavior as predicted in the numerical study. However, when it is compared to the shape of the hysterical curve, a slight difference is apparent. This is due to the influence of stiffness of bolt joints and the supports which is difficult to model precisely in the numerical studies
