No abstract

Eccentrically Brace Frame system develops its ductility using link inelasticity. Therefore, the strength of the structure in resisting the lateral force is highly dependent on the link and some types of link that are commonly used. Furthermore, it needs to compare the behavior of two section frames that most commonly used as a link in EBF system building; they are WF section and tubular section. In addition to the cross-sectional factors, deformation of the link is also highly dependent on the length of the link, hence the test will also be done on three different type of link lengths, they are short links, intermediate links, and long links, that are according to the classification of link lengths defined in AISC Seismic Provision. Before starting the analysis, a literature study has been reviewed to learn more about the behavior of a link under cyclic load. The numerical analysis has been done to find the strength of the link and modeling with the Finite Element Analysis (FEA) using ABAQUS. After all analysis and the calculation are completed, the results will appear in three-dimensional modeling form, Displacement versus Force diagrams and the stress-strain curves to show the ductility of all specimens. The result of the study showed that in short links, both WF link and tubular link achieve nominal shear force is equal to V p plastic shear force with values 390 kN for tubular section and 437 kN for WF section, and the value of shear force to the classification of the short link is very dependent on the body cross-sectional area. Tubular link's body with an area of 89% of the WF link total weight generates shear forces 89% of the shear force from WF link because the formulation of the plastic shear force V p is highly dependent on factors of body cross-sectional area (A w ). According to the research result, it shows that for both WF and tubular link cannot reach nominal shear force when the length of the link over the requirement of the shear link.

Examination of vulnerability level of buildings to earthquakes is divided into two types, the quick checks (Rapid Visual Screening, RVS) and a thorough examination. On thorough examination, it involves specialists of the field of building structures and other related fields, takes longer and is also cost much more expensive. While a quick check, it does not involve many specialists in a particular area, does not require a long time and are relatively inexpensive. This study builds an assessment of the vulnerability of buildings quickly adapted from FEMA 154 to the conditions and rules that applied in Indonesia using a smartphone application. A Global Positioning System (GPS) technology is used to mark the location of the data of the examination. The smartphone application called RViSITS is used to simplify and speed up the examination process and sent via the internet, and the server as a gathering and processing data. Furthermore, from these data do building vulnerability mapping and disaster-affected areas, which can then be accessed by the public, government and private sectors as well as database information. In this research, the RViSITS application process is to apply the application to do a quick check on the buildings in Surabaya, so that later the database and mapping vulnerability condition of buildings owned by government institutions in Surabaya against earthquake loadings can be made. While in general, this application can be used any places, so that the database and mapping the vulnerability of buildings can be held any area in Indonesia.

The paper disccuses an analysis study on the design of Eccentrically Braced Frame (EBF) i.e. short link, intermediate link and long link) with K-Braces-type Split 1 floor. The analysis is performed by using ABAQUS with static monotonic loading in a single structure (frame). Each element of the frame is modeled as sholid 3D with connections to every element in the form of tie constraints and given fixed on each base of the column as a boundary condition. All three models of the frame has been analyzed in accordance with the AISC 2010 provisions and then compared the behavior of each of these models. The results indicate that the short link model considered in this study have on a higher over strength value and used as a proposed model when compared to intermediate link and long link model. It is stated by the failure mechanism as well, the failure is well-occurred in the short link condition than the other models.

For a reinforced concrete column to behave in a ductile manner without much loss on strength requires sufficient confinement to the concrete core. One way to provide confinement to the concrete core is to use external confining devices such as a series of thin-walled circular steel sheet tube to confine the concrete. This type of external confining device falls off on the categories of Steel Tube Confined Concrete (STCC). With the presence of a gap between the steel sheet, the buckling on the tube due to high axial stresses can be avoided. On the other hand, STCC also offers great advantages to strengthen a non-code conforming reinforced concrete column to achieve better resistance to withstand earthquake load. From the numerical analysis point of view, the important task to successfully model the STCC specimen lies in the modeling of the interface behavior between concrete and steel tube. For that purpose, in this paper, the 3D-NLFEA package is used to study the response of STCC. The analysis result is further compared with the available test results in the literature. From the analysis, the predicted response is excellent. Detailed discussion on the parameter of the interface behavior between concrete and steel tube is presented.

Struktur komposit merupakan struktur yang terdiri dari dua atau lebih material berbeda sifat dan karakteristik yang berkerja bersama sama untuk memikul beban yang berkerja pada suatu struktur dalam hal ini digunakan material baja dan beton. Struktur komposit baja-beton memungkinkan pemanfaatan karakteristik dasar masing-masing bahan secara optimal, sehingga dengan penampang yang lebih kecil, mampu memikul beban serta dengan bentang yang sama dengan beton bertulang biasa. Gedung Brooklyn Alam Sutra Apartment merupakan gedung yang terdiri dari 19 lantai dan 1 lantai atap yang pada awalnya didesain dengan menggunakan struktur beton bertulang. Perancangan bangunan ini dimodifikasi menggunakan struktur komposit baja-beton. Dalam tugas akhir ini dilakukan perencanaan ulang menggunakan struktur komposit baja-beton dengan Sistem Rangka Bresing Eksentris (SRBE). Kelebihan sistem ini adalah daktilitas struktur yang baik dengan mekanisme kelelehan geser yang terjadi pada link. Link adalah bagian pada elemen struktur balok yang dibentuk oleh perpotongan balok dan bresing. Telah dilakukan perencanaan struktur gedung menggunakan komposit baja-beton Sistem Rangka Bresing Eksentris (SRBE) yang memenuhi persyaratan keamanan struktur berdasarkan

<p>This study aimed to perform a further analysis regarding the Reinforced Concrete Submerged Floating Tunnel of Triangle Cables Configuration (RC-SFT TCC) system fitting to attain the structure with the optimum configuration. The TCCs were inducted into several configurations, namely C1, C2, C3, and C4 that remined the two angle inclined cables of 36˚ and 45˚ respectively with a different pattern. Subsequently, a numerical modelling was also carried out using Finite Element Method (FEM) with the employment of SAP2000. Buoyancy Weight Ratio (BWR) of 1.3-1.5 were also added in this study to provide the optimum of the RC-SFT configuration. The modelling result showed that the C1 provided the most optimum configuration due to the maximum axial forces of 1145.1 kN. The C1 was also considered giving a better performance due to load-deformation behaviour than the C2, C3, and C4 models. Finally, it can be confirmed that RC-SFT is feasible to be applied as an alternative infrastructure due to its results.</p>

Eccentrically Braced Frames (EBF) have been used as earthquake suppression systems, especially in buildings. This system relies on yielding at link. EBF with horizontal link has important weaknesses to review. In the event of an earthquake that causes the link beam to rotate vertically, causing the structure above the beam damaged. Also it is not easy to repair the beam link at H-EBF after a severe earthquake. To overcome the problems in the H-EBF system, a new system was proposed, called Vertical-EBF (V-EBF). Links with WF and tubular profiles are two profiles commonly used in structures. In this research, EBF specimen modeling with tubular profile vertical links was compared with EBF horizontal links. The results showed a structure with V-EBF had a lighter weight. Yielding only occur at link so its better for earthquake rehabilitation.Kata kunci: rangka bresing eksentrik, rehabilitasi gempa, metode elemen hingga, kurva histeresis AbstrakEccentrically Braced Frames (EBF) telah digunakan sebagai sistem penahan beban gempa, terutama pada bangunan gedung. Sistem ini mengandalkan pada lelehnya link terlebih dahulu. EBF dengan link horizontal (H-EBF) memiliki kelemahan yang penting untuk ditinjau. Pada saat terjadi gempa bumi yang menyebabkan link balok akan memutar secara vertikal sehingga menyebabkan struktur diatas balok akan rusak. Selain itu tidak mudah memperbaiki link balok di H-EBF setelah gempa bumi yang parah. Untuk mengatasi masalah dalam sistem H-EBF, terdapat sistem yang telah diusulkan, disebut Vertikal-EBF (V-EBF). Link dengan profil WF dan tubular adalah dua profil yang biasa digunakan pada struktur. Pada penelitian ini dilakukan pemodelan spesimen EBF link horizontal dibandingkan dengan EBF dengan link vertikal berprofil tubular. Hasil penelitian menunjukkan struktur dengan V-EBF memiliki berat lebih ringan. Pelelehan pada V-EBF hanya terjadi pada bagian link sehingga lebih baik dalam rehabilitasi gempa.