Study of the design and flexural performance of an innovative Fiber Reinforced Polymer/steel-concrete composite beam

Abstract

A novel FRP/steel-concrete composite beam consisting of concrete slab and innovative hybrid FRP/steel hollow box shell takes full advantage of inherent and complementary properties of FRP, steel and concrete. To facilitate the practical application of this novel FRP/steel-concrete composite beam, preliminary design concepts were offered while analytical equations were derived to evaluate the flexural performance of the composite beam based on analysis of typical failure modes. Three FRP/steel-concrete composite beams with different steel volume fraction had been devised by the proposed design method, and four-point bending tests were conducted to investigate the failure mode, ultimate flexural capacity, deflection and interface slip. The practical composite beams exhibited satisfying structural behavior during the tests, while a fairly good agreement with the experimental results and the estimated values confirmed the reliability and feasibility of the preliminary design method.

Numerical Study on Impact Performance of Phosphogypsum Foam Concrete

“…ABAQUS offers models for brittle cracking, dispersion cracking, and plastic damage in concrete materials (Li et al, 2023). Since the plastic damage model applies directly to the two-dimensional stress state by defining the concrete shear modulus transfer coefficient and damage parameters and has few parameters and easy convergence, the stress-strain curve obtained from the test agrees well with the model, as noted in the article's specification and report (Peng et al, 2023).…”

“…This study employs the concrete plastic damage model to conduct low-speed impact simulation calculations on C50 concrete slabs and PFC slabs. The uniaxial compressive constitutive model formulation is presented in the equation ( 1), and the resulting stress-strain curve of compressed concrete is illustrated in Figure 5 (Li et al, 2023).…”

“…(2), ft is taken as the standard value of the axial tensile strength of concrete; t0 is calculated from the equation t0=ft/Ec, taking 0.000085; t is the parameter value of the descent segment, which is taken as 2.96 by linear interpolation. The calculated tensile stress-strain curve of concrete is shown in Figure6(Li et al, 2023).…”

Tensile behavior of CFRP-Steel composite laminates

“…[12][13][14][15][16] Based on the results from tests and numerical evaluation, theoretical methods were proposed, which demonstrated high accuracy in predicting the mechanical performance of FMLs. [17][18][19][20][21][22] Li et al 23 proposed a novel FRP/steel-concrete composite beam consisting of a concrete slab and an innovative hybrid FRP/steel hollow box shell. The simplified design method was discussed, and a bending test was conducted to study the mechanical properties of this hybrid beam.…”