The shear key is an important part of a precast segmental concrete bridge. Aside from its function of contributing to the distribution of shear force from one concrete segment to another, it helps to join precast concrete segments to become a complete bridge structure and provide continuity of movement for vehicles and pedestrian traffic. This numerical study discusses the behavior of a full-scale shear key connection without epoxy joining two concrete blocks representing segmental precast concrete at which two external forces load the blocks. Ferro Casting Ductile (FCD) is used as the metal shear key material where the shear key consists of two parts, a male and a female shear key. Numerical simulation is conducted using the ANSYS academic package, with nonlinear analysis implemented accordingly. The appropriate constitutive materials in relation to the numerical program, both for concrete and FCD, are taken from the appropriate literature. Two criteria are employed in the study; failure of the concrete block and yielding of the shear key that follows the von Mises criterion. Shear key connection system capacity is evaluated by applying different magnitudes of horizontal force. The validation of two numerical simulation studies is conducted by two experimental programs that cover laboratory experimentation of full-scale shear keys connecting two concrete blocks. The numerical and experimental results produce an almost similar relation of shear stress at the male shear key and vertical displacements of the upper block relative to the lower concrete block. Finally, a contour of shear key shear stress as a function of the different magnitudes of equivalent prestressing and different quality of concrete compressive strength is proposed.

Intensitas gempa yang terjadi di Indonesia cukup banyak, maka gedung – gedung tinggi yang ada di daerah – daerah di Indonesia harus didesain tahan gempa. Penelitian ini dilakukan secara numerik dimana modelisasi dari struktur bangunan dilakukan dengan menggunakan software ETABS yang berbasis metode elemen hingga untuk mengetahui respon struktur dari gedung bertingkat dengan layout persegi panjang akibat adanya dinding geser yang berada di bagian dalam dan sisi luar gedung. Hasil modelisasi numerik dari respon struktur gedung menunjukkan bahwa mode shape pertama dan kedua tidak menunjukkan rotasi dan pada mode shape ketiga barulah terjadi rotasi. Partisipasi massa juga telah mencapai 90% pada pola ragam getar ke 7 untuk arah X, pola ragam getar ke 8 untuk arah y, dan pola ragam getar ke 9 untuk arah Z. Gaya geser dasar struktur hasil analisis dinamik juga belum memenuhi persyaratan 85% gaya geser statik untuk di arah X sehingga perlu dilakukan skala pembesaran. Respon terakhir yang dilihat adalah simpangan antar tingkat dari model struktur dimana masih dibawah dari simpangan izin yang diizinkan, namun memiliki selisih nilai yang cukup banyak.

High rise buildings should be made as sufficient seismic performance, so it won’t immediately collapse when an earthquake occurs. Therefore, lateral strengthened stories are required in high rise buildings to enhance the lateral rigidity of structure. The use of lateral strengthening has a great effect on the entire seismic performance. A 20-stories high rise steel structure building was evaluated on this research comparing the structures’ inelastic behaviour using two seismic force-resisting system, i.e., special moment frame and eccentrically braced frame. The analysis of inelastic behaviour in this research using static non-linear analysis, i.e., pushover analysis. By using pushover analysis, the inelastic behaviour of structures, including story drift, shear story, displacement, plastic joint formation, and ductility, were obtained. In the elastic condition, the shear story of the eccentrically braced frame system is smaller than the special moment frame system. While in plastic condition, the shear story of the eccentrically braced frame system is larger than the special moment frame system. The story drift and the displacement of the special moment frame system are indicated to be larger than the eccentrically braced frame system. These results show that the eccentrically braced frame system has better rigidity than the special moment frame system.

The high potential of earthquake in Indonesia made the earthquake as an important factor in the planning of a building. The study aimed to make modelling, analyzing structure displacement during earthquake, knowing the vibration period and the stiffness of the structure and analyzing the inner force. The research was conducted in Kelapa Gading North Jakarta. The research used secondary data from KSO Jaya Konstruksi-Adhikarya. The flyover modeling was based on secondary data and used CSI bridge. The results showed structure displacement was 92.5 mm and it was lower than allowable displacement value, so was classified as the safe category. There were 12 vibration modes that could be occured in the flyover structure. The largest vibration period occurred in mode 1 and was equal to 0.84 sec which represented the behavior of the structure. The total stiffness value of the structure was 275512.95 kN/m. The inner force of the structure were axial force, shear force, torsion and the moment.