Perkuatan lentur pelat lantai tampang persegi dengan penambahan tulangan tarik dan mortar serta menggunakan stud sebagai penyedia geser

HARIANJA, Toni Hasudungan, Prof. Ir. Iman Satyarno, M.E., Ph.D

2010 | Tesis | S2 Teknik Sipil

Perkuatan bangunan saat ini banyak dilakukan antara lain karena perubahan fungsi bangunan atau faktor alam yaitu gempa bumi. Salah satu usaha yang dilakukan agar struktur bangunan tetap dapat dipergunakan tanpa pembongkaran yaitu dengan melakukan perkuatan pada bangunan tersebut. Penelitian bertujuan untuk mengetahui kapasitas lentur, kekakuan, daktilitas dan pola retak suatu pelat lantai tampang persegi yang diperkuat dengan penambahan tulangan tarik dan mortar serta menggunakan stud sebagai penyedia geser. Pada penelitian ini dibuat 2 buah benda uji pelat persegi yaitu pelat perkuatan dengan menggunakan shear connector U (PP-Shear connector U) dan pelat perkuatan dengan menggunakan baut (PP-Baut). Dimensi benda uji pelat 1700 mm x 700 mm x 100 mm dengan menggunakan tulangan asli D10 mm dan tulangan perkuatan D13 mm. Benda uji ditempatkan pada loading frame dengan tumpuan sederhana dan diberi beban statik di tengah bentang di mana pembebanan dilakukan secara bertahap dengan interval kenaikan 0,5 kN sampai retak pertama setelah itu interval pembebanan dilakukan sebesar 1 kN sampai mengalami keruntuhan. Hasil pengujian dibandingkan dengan analitis teoritis berdasarkan SNI dan program Response-2000. Hasil pengujian kuat lentur benda uji pelat perkuatan dengan menggunakan shear connector U dan pelat perkuatan dengan menggunakan baut secara berturut-turut sebesar 48,1 kN dan 44,7 kN. Kuat lentur berdasarkan Response-2000 sebesar 41,31 kN dan pelat sebelum perkuatan atau pelat kontrol (PK) sebesar 16,41 kN. Hasil pengujian menunjukkan peningkatan kapasitas lentur PP-Shear connector U, PP-Baut dan pelat Response-2000 secara berturutturut sebesar 193,114%, 172,395% dan 151,737% terhadap PK. Kekakuan lentur hasil eksperimen PP-Shear connector U dan PP-Baut untuk initial stiffness secara berturut-turut mengalami kenaikan terhadap PK sebesar 310,333% dan 234,631%. Kekakuan lentur benda uji untuk secant stiffness secara berturut-turut mengalami kenaikan PK sebesar 95,378% dan 47,523%. Daktilitas benda uji hasil eksperimen untuk PP-Shear connector U dan PP-Baut mengalami peningkatan terhadap PK secara berturut-turut sebesar 11,953% dan 4,039%. Pola keruntuhan yang terjadi pada pelat perkuatan dengan menggunakan shear connector U (PP-Shear connector U) dan pelat perkuatan dengan menggunakan baut (PP-Baut) adalah keruntuhan lentur.

Building reinforcements were mostly conducted due to the change in the building functions or due to natural factors like earthquake. One of the efforts of maintaining the building structure in order to maintain function without any dismantling is by strengthening the building. The research aims at determining the flexural capacity, stiffness, ductility, and crack pattern of a floor slab with square slab reinforced with an addition of tensile reinforcement and mortar and the use of shear connector. In this research, two specimens of slab were made namely reinforcement slab using stirrups (PP-shear connector U) and reinforcement slab using bolts (PPbolt). Dimensions of the slab specimens were set as 1700 mm x 700 mm x 100 mm by using primary reinforcement with a diameter of 10 mm and 13 mm for strengthened reinforcement. The specimens were placed on the loading frame with simply supported and were loaded with static load at mid-span on which the loading was conducted in a stepwise way with an interval increment of 0,5 kN to the initial crack, then the loading interval was increased to 1 kN until the slab specimens failure. Numerical approach with Response-2000 program was conducted to provide a comparison among the results. The test results were compared with analytical theory based on SNI and Response-2000 program. The experimental results of flexural strength for PP-shear connector U and PP-bolt were 48,1 kN and 44,7 kN, respectively. Flexural strength based on Response-2000 and control slab or before strengthened slab were 41,31 kN and 16,41 kN. The test results of PP-shear connector U, PP-bolt and Response-2000 indicated an increment in the flexural capacity by 193,114%, 172,395% and 151,737 kN respectively, relative to control slab or before strengthened slab. Experimental results for flexural stiffness of the specimens for PP-shear connector U and PP-bolt for initial stiffness were 10869,565 N/mm and 8951,613N/mm, respectively. Increment in the slab flexure of PP-shear connector U and PP-bolt relative to the control slab were 381,696% and 296,670%. Flexural stiffness of the specimens for secant stiffness were 3734,472 N/mm and 2515,003 N/mm, respectively. Increment in the slab flexure of PP-shear connector U and PP-bolt relative to the control slab or before strengthened slab were 162,931% and 77,072%, respectively. Ductility of the specimens resulted from the experiments for PP-shear connector U and PP-bolt relative to control slab or before strengthened slab were 3,572 and 2,582, respectively. Failure pattern that prevailed at PP-shear connector U and PP-bolt was flexural failure.

Kata Kunci : Pelat lantai,Perkuatan,Kapasitas lentur,Statik,Response,2000, Floor slab, reinforcement, flexural capacity, static, Response-2000