Efek Dari Tegangan Awal Tulangan Tarik Dan Temperatur Tinggi Pada Retak Beton

Army, Buyung and Rusli, Lismar and -, Apwiddhal (2007) Efek Dari Tegangan Awal Tulangan Tarik Dan Temperatur Tinggi Pada Retak Beton. Rekayasa Sipil, 2 (2). pp. 18-24. ISSN 1858-3695

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Abstract

Strength of Structure decreased due to fire exposure. This strengrth was affected by type and depth of crack, heat variation and fire duration- The deeper the crack, the higher the reduction of strength of the structure as a whole, because the convection of heat arrived on the steel reinforcement faster than the conduciion lhe steel yielded faster. This research was conducted by making 30 specimens of standard concrete cylinder with 150 mm diameter and 300 mm long and 26 specimens of concrete cylinder with 60 mm diameter and 40O mm long. The steel bar was anchored in the middle of the cross sec{ion of the later cylinders. The bar dimension of ,l3 mm diameter was reduced to 10 mm in 100 mm long, positioned at 150 mm from the concrete cylinder ends. ln this research there were 2 kinds of concrete strength used, which is 22,5 MPa and 40 MPa. The peripheral surface of 60 mm diameter of concrete cylinder was heated in the electrical heater at various temperature up to 750 °C for 1,5 hours and pulled axialty to certain stresses during heating. The research included concrele modulus of elasticity, crack width due to heating, effect of.heating temperature to the steel bar. The results indicate that static modulus of elasticity (employing SNI formula) is 8-25 % higher than that using B.C CP 110. By comparing the research results (obtained from stress-strain relationship curve) it is indicate that static modulus of elasticity is 1G 25 % higher than to the B.C CP110. Test results also indicate that concrete is vumerable to crack under high temperature. The averages of 3 cracks of the concrete are 1,61, 0,64, 0,55 and 0,75 mm for 100%Pcr, 80 %Pcr, 60%Pcr and 40%Pcr respectively for concrete compressive strength of 22,5 MPa, while such cracks are 1,30, 1,24, 0,96 and 0,83 mm for 40MPa. The crack widths are above allowable crack width for interior and exterior structures by 121,18% and 168,10% respectively tor 22,5 MPa concrete specimers and 170,83% and228,28% respectively for 40 MPa concrete. The elongation of specimens of 100%Pcr loading is sQnificant compared to below 100%Ps loading. Steel bar elongations for 80o/oPcr, 607oPcr, 40%Pcr are 12,9%, 9,70%, 8,36% respectively tor 22,5 MPa cornpared to 100% Pcr, while for 40MPa concrete this elongations are 96,87% 13,98% and 9,29% respectively.

Item Type:Article
Subjects:G Technology > GA Engineering (General). Civil engineering (General)
Divisions:Jurusan Teknik Sipil > Prog.Studi Teknik Sipil-D3 > Jurnal/Karya Ilmiah
ID Code:32
Deposited By:Mr. OP Repo-4 Puskom
Deposited On:03 Oct 2016 19:31
Last Modified:09 Nov 2016 11:31

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