|
Title |
Experimental Studies on Shear Strength of High-Strength Lightweight Concrete Beam using the Industrial by-products
|
|
Keywords |
경량 콘크리트 ; 전단스팬비 ; 전단강도 ; 인장철근비 |
|
Abstract |
Twelve beams made of lightweight high-strength concrete were tested to determine their diagonal cracking and ultimate shear capacities. A total of 12 beams without(4 beams) and with lightweight(8 beams) were tested in a stiff testing facility, and complete load-midspan deflection curves, including the maximum capacities portion, were obtained. The variables in the test program were concrete strength, which varied 35.4 MPa, 65.3 MPa; shear span-depth ratios a/d=1.5, 2.5, 3.5, 4.5; and tensile steel ratio between 0.57 and 2.3 percent. Also, we divided beam by diagonal tension crack and ultimate shearing strength to propose an equation. In addition, it analyzed comparison mutually applying existing proposal and guide. Vcr was as result that AIK recommendations and Zsutty proposal decrease more than a/d=2.5, increased some in Mathey's proposal equation. Vcr,exp/Vcr.cal showed tendency of overestimation according to increase of tensile steel ratio and compressive strength of concrete. On the other hand, Vcr,exp/Vcr.cal is superior in conformability with an experiment result Zsutty's proposal among other equations. The proposal equation hew that expect Vcr,/Vy, rationally about shearing strength. Therefore, shear strength an equation is considered to be utilized usefully evaluating capacity by change of the shear span depth ratio of lightweight concrete, tensile steel ratio, and compressive strength of the concrete in this research.
|