Abstract
In order to investigate the main influencing factors and development rules of the shear performance of high strength concrete (HSC) beams without web reinforcement under concentrated loads, analyze and compare the rationality of the China and American Code formulas and Zsutty formula, in this paper, 303 sets of experimental data about the shear test of HSC beams without web reinforcement at home and abroad were selected, based on these experimental data, the calculation method of the shear capacity of HSC beams without web reinforcement was discussed. The results showed that the measured shear bearing capacity of HSC beams without web reinforcement gradually increases with the decrease of the shear-span ratio. The nominal shear stress of HSC beams without web reinforcement gradually increases with the increase of concrete strength, the increase of longitudinal reinforcement ratio and the decrease of section height. The shear bearing capacity formula proposed by Zsutty is the most accurate prediction than other formulas. Based on the experimental data and considering the influence of the longitudinal reinforcement ratio on the shear bearing capacity of structure, a new calculation formula for the shear bearing capacity of HSC beams without web reinforcement under concentrated loads was obtained by regression analyze, and this formula is more comprehensive than the other three calculation formulas, moreover, the calculation results are more reasonable.
Highlights
It is well known that ordinary concrete has low compressive strength and weak impact resistance, which is often difficult to meet people's design and construction needs when constructing high-rise and super high-rise buildings
For the formulas are based on the test of ordinary concrete beams, conversion relationship between the concrete cube and whether they can be applied to the shear design of high strength concrete (HSC) beams needs further examination
This paper analyzes the effects of shear-span ratio, concrete strength, longitudinal reinforcement ratio and crosssectional dimensions on the shear performance of HSC beams without webs based on the collected experimental compressive strength fcu and the cylinder compressive strength fc ', the fc ' =0.85 fcu proposed by Ye 8 was used
Summary
It is well known that ordinary concrete has low compressive strength and weak impact resistance, which is often difficult to meet people's design and construction needs when constructing high-rise and super high-rise buildings. In the process of converting the tensile strength of concrete f t and cube compressive strength fcu , Wu data of 303 groups of HSC beams without web reinforcement at home and abroad, and compares them with the shear bearing capacity formula of concrete beams. Structures (GB 50010-2010), American Code for Design of the specification, in order to facilitate the comparison of Concrete Structures (ACI 318-14) and Zsutty, the calculation formula of shear bearing capacity of beams of the parameters, a unified conversion is carried out, and the formula is: without web reinforcement considering shear-span ratio, concrete strength and longitudinal reinforcement ratio is ft f 0.55 cu (1). Note: is the calculated section shear-span ratio; b is the calculated section width; h0 is the effective height of the calculated section; ft is the design value of the concrete axial tensile strength; fc' is the compressive strength of the concrete cylinder; is the longitudinal reinforcement ratio; Vu is the measured shear bearing capacity of the specimen
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