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Abstrak :
ABSTRAK
Cerobong adalah struktur yang tinggi yang terdiri dari Inner Flues dan Windshield. Mekanisme tahan gempa struktur ini dapat diraih dengan memasang Tie Rods dan Elastomeric Rubber Bearing. Fokus dari riset ini adalah menganalisa efektifitas Tie Rods dalam mengurangi dampak gempa terahadap struktur Inner Flues. Hasil memperlihatkan bahwa variasi kekakuan Tie Rods tidak berdampak siknifikan terhadap respon struktur windshield. Struktur Inner Flue tidak berfungsi sebagai Tuned Mass Damper karena massa-nya relatif sangat ringan. Tetapi, Tie Rods sangat mempengaruhi respon Inner Flues. Respon Inner Flues yang optimal adalah pada saat kekakuan Tie Rod?s berkurang seiring bertambahnya ketinggian struktur tersebut.

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ABSTRACT
Chimney is a tall tubular structure consisting inner flue and windshield. Its Earthquake resistance mechanism can be achieved by installing elastomeric rubber bearings and Tie Rods. The focus of this research is to analyze the effectiveness of Tie Rods in reducing seismic impact to the inner flues. The results show that the change in Tie Rods? stiffness variation does not affect the response of the windshield. Inner Flue does not function as tuned mass damper as its mass is relatively small. But Tie Rods strongly affect Inner Flues? responses. Inner Flues responses are optimal when Tie Rod?s stiffness is varied increasingly down through the lower elevation of the structure.

Abstrak :
Cerobong adalah struktur yang tinggi yang terdiri dari Inner Flue dan Windshield. Mekanisme penahan gempa struktur ini dapat diraih dengan memasang bantalan karet elastomer. Riset ini memperlihatkan bahwa semakin besar kapasitas leleh karet elastomer, semakin serupa responya dengan struktur berperletakkan sendi. Kapasitas leleh dan kekakuan geser yang rendah menghasilkan gaya geser dasar yang sangat rendah. Bantalan karet elastomer dapat mereduksi simpangan struktur sebesar 67.4%, Gaya geser dasar sebesar 72.16%, Tegangan elemen tulangan S22 dan S11 sebesar 75.6% dan 73.7%, tegangan elemen beton S22 dan S11 sebesar 55.7% dan 74.6%, Dengan ini tulangan baja pada struktur terhindar dari kelelehan dan mereduksi tegangan akibat gempa yang terkonsentrasi pada daerah bawah dan 1/3 dari ketinggian struktur. ......Chimney is a tall tubular structure consisting inner flue and windshield. Its earthquake resistance mechanism can be achieved by installing rubber isolator, such as, the elastomeric rubber bearing. This research shows the higher the yield capacity of the rubber isolator the more resemblance its response with pin supported structure. Lower yield capacity and shear stiffness produces the lowest base shear. Elastomeric rubber bearing can reduce structure drift up to 67.4%, base shear up to 72.16%, bar element S22 and S11 stresses up to 75.6% and 73.7%, concrete element S22 and S11 stresses up to 55.7% and 74.6% respectively. Thus, preventing reinforcing bar from yielding and reduces the overall earthquake induced stresses that is concentrated around the bottom and 1/3 of its elevation.

Abstrak :
ABSTRAK
Analisis riwayat waktu nonlinier akan dilakukan pada jembatan melengkung putar balik dengan radius 45 meter. Jembatan yang sangat tidak beraturan ini akan dievaluasi dengan melakukan analisis riwayat waktu nonlinier pada model jembatan yang divariasikan menjadi 3 tipe sambungan: i sambungan kaku ii sambungan sendi iii sambungan lead rubbber bearing. Sendi plastis dimodelkan pada bagian dasar dan bagian atas dari pilar dengan menggunakan sendi plastis fiber. Hasil analisis menunjukkan bahwa jembatan dengan satu perletakan memberikan tingkat kinerja yang lebih baik dibandingkan jembatan dengan dua perletakan, tetapi jembatan dengan satu perletakan lebih kritis terhadap masalah torsi.

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ABSTRACT
Non linear time history analysis will be presented in irregular U turn curved bridge with radius of 45 meters. This highly horizontally curved bridge is evaluated by performing nonlinear time history analysis on the representative bridge model with 3 types of connection i rigid connection ii hinge connection iii lead rubber bearing connection. Nonlinear hinge was modelled at the base and top of the pier by using fiber hinge. The analysis results indicate that bridges with one connection give better performance level than bridge with two connections, but bridges with only one connection is more critical to the torsion issue.

Abstrak :
Cerobong adalah struktur yang tinggi yang terdiri dari Inner Flue dan Windshield. Mekanisme penahan gempa struktur ini dapat diraih dengan memasang bantalan karet elastomer. Riset ini memperlihatkan bahwa semakin besar kapasitas leleh karet elastomer, semakin serupa responya dengan struktur berperletakkan sendi. Kapasitas leleh dan kekakuan geser yang rendah menghasilkan gaya geser dasar yang sangat rendah. Bantalan karet elastomer dapat mereduksi simpangan struktur sebesar 67.4%, Gaya geser dasar sebesar 72.16%, Tegangan elemen tulangan S22 dan S11 sebesar 75.6% dan 73.7%, tegangan elemen beton S22 dan S11 sebesar 55.7% dan 74.6%, Dengan ini tulangan baja pada struktur terhindar dari kelelehan dan mereduksi tegangan akibat gempa yang terkonsentrasi pada  daerah bawah dan 1/3 dari ketinggian struktur. ......Chimney is a tall tubular structure consisting inner flue and windshield. Its earthquake resistance mechanism can be achieved by installing rubber isolator, such as, the elastomeric rubber bearing. This research shows the higher the yield capacity of the rubber isolator the more resemblance its response with pin supported structure. Lower yield capacity and shear stiffness produces the lowest base shear. Elastomeric rubber bearing can reduce structure drift up to 67.4%, base shear up to 72.16%, bar element S22 and S11 stresses up to 75.6% and 73.7%, concrete element S22 and S11 stresses up to 55.7% and 74.6% respectively. Thus, preventing reinforcing bar from yielding and reduces the overall earthquake induced stresses that is concentrated around the bottom and 1/3 of its elevation.

Abstrak :
Di dalam perancangan bangunan tinggi, pondasi biasanya dimodelkan sebagai perletakan jepit. Akibatnya, perbedaan jenis pelat lantai dasar yang digunakan tidak mempengaruhi respons struktur dan gaya geser dasar dianggap bekerja serentak. Padahal, terdapat dua jenis pelat lantai dasar (suspended slab dan slab-on-ground) yang dapat memberi kekakuan yang berbeda pada perletakan bangunan. Ditambah lagi, kekakuan perletakan berperan besar dalam memberi kekakuan pada bangunan tinggi. Dengan demikian, pengaruh pemodelan perletakan terhadap respons seismik struktur perlu diteliti. Penelitian ini bertujuan untuk menganalisis respons bangunan tinggi akibat beban gempa dan menganalisis pengaruh variabel-variabel yang ada (tinggi bangunan, Ly/Lx bangunan, asumsi diafragma lantai tingkat, jenis diafragma lantai dasar, dan pemodelan perletakan) terhadap karakteristik dinamik dan respons struktur dengan analisis spektrum respons menggunakan ETABS berlisensi Laboratorium Struktur UI. Hasilnya, suspended slab memperbesar gaya geser dasar dinding geser. Selain itu, perbedaan jenis diafragma lantai dasar menyebabkan perbedaan distribusi: gaya geser tingkat gedung dan dinding geser, drift antarlantai, gaya tarik cord, serta gaya tekan kolektor. Perbedaan gaya tarik cord tersebut membesar jika Ly/Lx bangunannya membesar. Kemudian, perletakan lentur memperbesar gaya geser dasar gedung, sedangkan perletakan kaku memperbesar gaya geser dasar dinding geser. Selain itu, perbedaan jenis perletakan, khususnya perbedaan kekakuan pegas, menyebabkan perbedaan distribusi: gaya geser tingkat gedung, dinding geser, dan portal, drift antarlantai, gaya tekan kolektor, serta gaya tarik cord. ......In design of high-rise building, foundations are usually modeled as fixed supports. As a result, different type of ground slabs does not affect structure response and base shear is assumed to work together. In fact, there are two types of ground slabs (suspended slab and slab-on-ground) which can give different stiffness to the supports. In addition, supports’ stiffness have a big role in giving stiffness to high-rise building. Therefore, effects of supports modelling to structure’s seismic response need to be investigated. This research aims to analyze high-rise building’s response due to seismic load and analyze effects of variables (building’s height, Ly/Lx of building, assumption of story diaphragm, types of ground slabs, and supports modelling) on structure’s dynamic characteristic and response using response spectrum analysis by ETABS with a license belonging to Universitas Indonesia Laboratory of Structure. The result is that suspended slabs increase shearwalls’ base shear. Furthermore, different type of ground slabs cause differences of distribution of: building and shearwalls’ story shear, story drift, cords’ tension force, and collectors’ compression force. The differences of distribution of cords’ tension force will increase if Ly/Lx of building increase. Then, flexible supports increase building’s base shear whreas rigid supports increase shearwalls’ base shear. Furthermore, different type of supports, especially different stiffness of springs, cause differences of distribution of: building, shearwalls, and frames’ story shear, story drift, cords’ tension force, and collectors’ compression force.

Abstrak :
This book presents selected papers presented during the International Symposium on Earthen Structures held in IISc Bangalore. The papers in this volume cover the theme of earthen structures, with technical content on materials and methods, structural design and seismic performance, durability, seismic response, climatic response, hygrothermal performance and durability, design and codes, architecture, heritage and conservation, and technology dissemination. This book will be of use to professionals, academics, and students in architecture and engineering.

Abstrak :
[Penelitian ini membahas mengenai analisis perilaku dinamik struktur bangunan tahan gempa dengan perletakan terisolasi dengan cara membandingkannya dengan bangunan dengan perletakan tetap. Bangunan dengan perletakan terisolasi dimodelkan dengan menggunakan base isolation yang sesuai dengan yang digunakan oleh rumah sakit UI, sementara bangunan dengan perletakan tetap dimodelkan dengan menggunakan perletakan jepit. Beban gempa yang digunakan adalah beban gempa riwayat waktu northridge, kobe, dan el-centro yang telah diskalakan dengan respon spektrum Depok sesuai dengan SNI 1726:2012 Tata cara perencanaan ketahanan gempa untuk struktur gedung dan non gedung. Analisa yang digunakan yaitu nonlinear time history direct integration. Nonlinearitas dari bangunan didapatkan dari material dan geometri yang diwakilkan oleh sendi plastis pada bangunan dengan perletakan tetap dan base isolator yang telah berdeformasi melebihi batas lelehnya pada bangunan dengan perletakan terisolasi. Dari hasil penelitian menunjukkan penggunaan base isolator pada struktur bangunan tahan gempa meningkatkan peforma bangunan akibat beban gempa, serta memperkecil gaya dalam element-element struktur bangunan. ......This study discusses the comparison of the dynamic behaviour analysis of the isolated base seismic structure and fixed base structure. The isolator used in the mathematical model of the isolated base structure in this study is the same with the isolator that will be used in the real UI Hospital Building, while the fixed base structure modeled by rigid base. The seismic load used in this study are time history seismic load of Northridge, Kobe, and El Centro. The time history is scaled by the factor appropriate with SNI 1726:2012. Nonlinear time history direct analysis method will be performed in this study. The nonlinearity of the structure consists of geometrical nonlinearity and material nonlinearity gained from the plastic hinge and the deformation of the isolator that exceed its yield deformation point. Result shows that isolated base structure has better performances than fixed base structure. It showed by the decreasing amount of the internal forces of each elements of the structure.;This study discusses the comparison of the dynamic behaviour analysis of the isolated base seismic structure and fixed base structure. The isolator used in the mathematical model of the isolated base structure in this study is the same with the isolator that will be used in the real UI Hospital Building, while the fixed base structure modeled by rigid base. The seismic load used in this study are time history seismic load of Northridge, Kobe, and El Centro. The time history is scaled by the factor appropriate with SNI 1726:2012. Nonlinear time history direct analysis method will be performed in this study. The nonlinearity of the structure consists of geometrical nonlinearity and material nonlinearity gained from the plastic hinge and the deformation of the isolator that exceed its yield deformation point. Result shows that isolated base structure has better performances than fixed base structure. It showed by the decreasing amount of the internal forces of each elements of the structure.;This study discusses the comparison of the dynamic behaviour analysis of the isolated base seismic structure and fixed base structure. The isolator used in the mathematical model of the isolated base structure in this study is the same with the isolator that will be used in the real UI Hospital Building, while the fixed base structure modeled by rigid base. The seismic load used in this study are time history seismic load of Northridge, Kobe, and El Centro. The time history is scaled by the factor appropriate with SNI 1726:2012. Nonlinear time history direct analysis method will be performed in this study. The nonlinearity of the structure consists of geometrical nonlinearity and material nonlinearity gained from the plastic hinge and the deformation of the isolator that exceed its yield deformation point. Result shows that isolated base structure has better performances than fixed base structure. It showed by the decreasing amount of the internal forces of each elements of the structure., This study discusses the comparison of the dynamic behaviour analysis of the isolated base seismic structure and fixed base structure. The isolator used in the mathematical model of the isolated base structure in this study is the same with the isolator that will be used in the real UI Hospital Building, while the fixed base structure modeled by rigid base. The seismic load used in this study are time history seismic load of Northridge, Kobe, and El Centro. The time history is scaled by the factor appropriate with SNI 1726:2012. Nonlinear time history direct analysis method will be performed in this study. The nonlinearity of the structure consists of geometrical nonlinearity and material nonlinearity gained from the plastic hinge and the deformation of the isolator that exceed its yield deformation point. Result shows that isolated base structure has better performances than fixed base structure. It showed by the decreasing amount of the internal forces of each elements of the structure.]

Abstrak :
Penambahan basement di sekitar menara masjid yang sudah terbangun memerlukan struktur pelindung seperti sheetpile terhadap galian tanah maupun gempa bumi. Skripsi ini membahas tentang efek sheetpile yang dibangun di sekeliling menara masjid terhadap respon seismik struktur menara dan pondasinya. Penelitian ini menggunakan gempa sesuai SNI 1726-2012 dengan metode respon spektrum untuk menganalisis karakteristik dan respon seismik menara yang menggunakan sheetpile dengan variasi kedalaman galian, diameter span sheetpile, ketebalan sheetpile, dan kedalaman sheetpile, serta kondisi lantai dasar menara dihubungkan dengan lantai di sekitarnya. Dari hasil penelitian, penggunaan sheetpile menurunkan periode getar, displacement, dan gaya dalam pondasi, namun meningkatkan gaya geser dasar dan gaya dalam menara. Penyambungan lantai dasar sekeliling menara dengan pilecap menurunkan periode getar, displacement, gaya geser dasar, dan gaya dalam pondasi, namun meningkatkan gaya dalam menara. ...... The addition of basement around a built minaret needs structures, such as sheetpile, that protect the minaret against the excavation and earthquake. This study discussed about the effect of sheetpile built around the minaret towards seismic response of minaret and foundation. This study uses response spectrum according to SNI 1726-2012 to analyze characteristics and seismic response of minaret with sheetpile with the variation of excavation depth, span diameter of sheetpile, sheetpile thickness, and depth of sheetpile installation, also in condition that the base of minaret connected with mosque platform. The study showed that sheetpile can decrease the vibration period, displacement, and foundation internal force, but it will increase base shear and minaret internal force. Moreover, connecting the base of minaret with the mosque platform will decrease the vibration period, displacement, base shear, and foundation internal force, but it will increase the minaret internal force.