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Abstrak :
Dalam struktur jembatan yang menggunakan sistem pracetak, sambungan merupakan titik terlemah dan menjadi suatu bagian yang krusial dalam sistem struktur jembatan. Sambungan memiliki fungsi untuk menyatukan antar segmen pracetak sehingga gaya geser dapat terdistribusi merata dari satu segmen ke segmen lainnya. Penelitian bertujuan untuk menganalisa perilaku kunci geser dengan material ferro casting ductile. Untuk mencapai tujuan tersebut, penelitian dilakukan secara numerik dengan mengacu pada hasil eksperimental penelitian kunci geser terdahulu dengan material ferro casting ductile. Studi numerik dilakukan dengan menggunakan pemodelan 2D dan 3D. Pemodelan 2D dengan SAP 2000 dan pemodelan 3D dengan Cast3M menggunakan model dengan skala 100% dengan kunci geser bertirus 2:1. Pemodelan 3D juga dilakukan dengan menggunakan program Midas FEA menggunakan model skala reduksi 50% dengan kunci geser tidak bertirus. Penelitian menggunakan male-female shear key ferro casting ductile dengan variasi kemiringan radial,variasi gaya pratekan dengan atau tanpa perekat pada sambungan. Dari hasil pemodelan 2D dengan SAP 2000 hasil pemodelan menunjukan hasil linear meskipun material non linear dan analisa non linear telah diterapkan. Untuk hasil pemodelan dengan Midas FEA, meskipun selisih perbedaan antara hasil eksperimen dan hasil numerik berada pada rentang 0-8% untuk beban maksimum tetapi perpindahan vertikal yang dihasilkan masih memiliki selisih mencapai lebih dari 30%. ......In structural bridge with precast segmental concrete. Joint between precast segmental is the weakest area of the structural system. Joint precast segmental is the most important part of the structural system with precast segmental due to its functionality. Joint of precast segmental has function to distribute shear stress among precast segmental parts. The objective of this paper is to study the mechanical behavior of FCD applied as shear key. Study analysis use numerical study and validate its results with reference experiment’s results from previous study experimental. Numerical study use model with basis 2D model and 3D model. 2D model use SAP 2000 and 3D model use Cast3M with model use scale 100% and radial shear keys with inclination scale 2:1. For Midas FEA use model reduction scale 50% and flat shear key. Numerical analysis use ferro casting ductile shear key with variation in inclination of radial shear key and horizontal force with or without epoxy. The results are 2D model with SAP 2000 resulting linear’s result despite non linear analysis has been implemented to the program and 3D model with Midas FEA has range margin error 0 – 8% for the maximum load occur on top of joint. Despite the maximum load’s error is quite small but the margin error for displacement reach more than 30%.

Abstrak :
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.

Abstrak :
Pada sambungan antar segmen pada jembatan pracetak diperlukan adanya kunci geser yang berguna untuk menyalurkan gaya geser dari satu segmen ke segmen yang lain dan juga untuk mencegah terjadinya perpindahan vertikal antar segmen. Penelitian dilakukan secara numerik untuk mengetahui hubungan beban dan perpindahan, kapasitas geser dari kunci geser ferro casting ductile (FCD) dan baja lunak (Mild Steel Shear Key) tanpa epoxy dan dengan epoxy. Penelitian dilakukan dengan 2 metode, yaitu force control dan displacement control. Variasi percobaan yang dilakukan adalah variasi beban arah horizontal yang merepresentasikan gaya pratekan dan variasi bentuk shear key. Dari hasil penelitian secara numerik menunjukkan bahwa semakin besar gaya arah horizontal yang diberikan maka kapasitas kunci geser dalam menahan gaya akan semakin besar, lalu penggunaan epoxy pada sambungan akan meningkatkan kapasitas geser pula.

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Shear key is required on the segmental concrete precast bridge joint to transfer shear force from one segment to another segment and for prevent vertical displacement that occur between segment. This research had done with numerical model to know the relation between load and displacement, ferro casting ductile and Mild Steel Shear Key capacity with epoxy and without epoxy. This research had done with 2 different methods, displacement control and force control. The variable variation is horizontal force which representating prestress load in segmental concrete precast bridge and the differentiation in the shape of shear key. From the experimental research and numerical research show that the greater horizontal force given, the greater shear key capacity to resist shear force and epoxy application to the joint can increase the shear force capacity.