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"In multi-storey steel frame structure, the requirements of lateral load resistance are very critical in the design. Shear wall, core wall and bracing system are commonly applied to resist the lateral loads. However for some case, due to the architechtural requirements, the design of unbraced frame which utilized only the stiffness of connections, columns and beams could not be avoided. As loads in unbraced frames are to be resisted by bending action of the frames's members without the need of a bracing system, the most common design approach is to use rigid joints. The objective of this paper is to compare the design of unbraced frames bending on major axis with rigid connections using S275 and S355. The frames were designed to satisfy the ultimate limit state and service limit state based on the BS 5950-1:2000. The limit of the sway-deflection is ht/300 for rigid connections. The analysis has shown better construction design for continuous with the total steel weight saving for frame design for frame design with steel S355 was up to 17% less than the frame design using steel S275."

"Tesis ini membahas tentang perilaku dan kinerja dari bangunan tinggi fungsi perkantoran yang didisain sesuai peraturan yang berlaku di Indonesia menggunakan sistem struktur penahan beban lateral kombinasi SRPMK beton dan rangka bresing baja prategang. Sistem struktur didisain dalam dua model. Model yang mengaplikasikan tension-only pada komponen diagonal bresingnya (model TO) dan yang tidak (model non-TO). Selanjutnya, struktur bangunan dianalisa menggunakan metode pushover FEMA 356 untuk kemudian dianalisa perilaku dan kinerjanya. Dari hasil penelitian didapatkan bahwa model yang mengaplikasikan tension-only pada komponen diagonal bresingnya (model TO) menghasilkan dimensi komponen diagonal bresing yang lebih ekonomis dan gaya prategang yang jauh lebih kecil tanpa mengurangi kinerja dari struktur itu sendiri.

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This thesis discusses about the behavior and the performace of a office high rise building that be designed according Indonesian code by using lateral load resisting structure system combination concrete sway special frame and prestressing steel brace frame. Structure system is designed in two models. Model that apply tension-only to the diagonal member of brace (TO model) and not (non-TO model). Furthermore, the building structure is been analysis by using FEMA 356 pushover to be analysing its behavior and performance. From the result of the research is obtained model that apply tension-only to the diagonal member of brace (TO model), produces more economical dimension of diagonal member of brace and smaller prestressing force without decreasing the performance of the structure."