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Abstrak :
Moda getar dan frekuensi natural yang merupakan karakteristik dinamik suatu sistem struktur, terbentuk berdasarkan properti fisik serta konfigurasi dari tiap komponen penyusun suatu sistem struktur. Sehingga perubahan karakteristik dinamik berarti juga perubahan pada properti fisik ataupun konfigurasi sistem struktur. Sehingga berlandaskan dari ide ini, dikembangakan suatu metode identifikasi lokasi dan tingkat kerusakan dengan memanfaatkan perubahan pada karakteristik dinamik. Pada penelitian ini salah satu metode tersebut ditampilkan, dan dilakukan beberapa simulasi dengan metode tersebut. Metode ini mampu memberikan hasil yang akurat untuk penentuan lokasi kerusakan, namun untuk penentuan tingkat kerusakan terdapat beberapa kekurangan, yaitu dibutuhkannya data modal yang cukup banyak serta besarnya kerusakan dan banyak elemen yang diidentifikasi secara simultan memberikan pengaruh yang cukup signifikan terhadap keakurasian hasil dari penentuan tingkat kerusakan. Selain itu untuk identifikasi tingkat kerusakan, disimpulkan bawah lokasi elemen dan fungsinya memiliki andil terhadap baik atau buruknya hasil identifikasi.

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Modes of vibration and natural frequencies are the dynamic characteristics of a structural system, which are formed by the physical properties and the spatial configuration of each component in a structural system. By this definition, a shift in each value of the dynamic characteristics means also that changes happen in the physical properties or the spatial configuration of the structure. Based on this idea, some methods to identify structural damage based on dynamic chracteristics are developed. In this research one of these methods is presented, and some simulations are carried out. This method is capable to identify the damage?s location with high accuracy, but there are some weaknesses on how the method identify the severity of the damage, such as; the method requires large number of modal data to identify damage severity on several elements and the amount of element identified with this method will affect drasticly the accuracy of this method. In addition, based on the simulation, the location and the function of the element identified, also affect the accuracy of the damage?s severity identification method.

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.