Flexural rigidity

About: Flexural rigidity is a research topic. Over the lifetime, 3829 publications have been published within this topic receiving 56780 citations.

Fatigue behavior of hybrid GFRP-concrete bridge decks under sagging moment

Abstract: This paper presents a new cost-effective hybrid GFRP-Concrete deck system that the GFRP panel serves as both tensile reinforcement and stay-in-place form. In order to understand the fatigue behavior of such hybrid deck, fatigue test on a full-scale specimen under sagging moment was conducted, and a series of static tests were also carried out after certain repeated loading cycles. The fatigue test results indicated that such hybrid deck has a good fatigue performance even after 3.1 million repeated loading cycles. A three-dimensional finite element model of the hybrid deck was established based on experimental work. The results from finite element analyses are in good agreement with those from the tests. In addition, flexural fatigue analysis considering the reduction in flexural stiffness and modulus under cyclic loading was carried out. The predicted flexural strength agreed well with the analytical strength from finite element simulation, and the calculated fatigue failure cycle was consistent with the result based on related S-N curve and finite element analyses. However, the flexural fatigue analytical results tended to be conservative compared to the tested results in safety side. The presented overall investigation may provide reference for the design and construction of such hybrid deck system.

Distinction between Punching and Flexural Failure Modes of Flat Plates

Abstract: It is often difficult to distinguish between flexural and punching shear failure modes in tests to study the effectiveness of shear reinforcement in providing strength and ductility in flat plates. Clear indicative results can only be obtained when the flexural reinforcement ratio is sufficiently high to exclude the possibility of flexural failure prior to punching. This study investigates the influence of the flexural reinforcement ratio on the mode of failure, strength, and ductility using experiments on interior slab-column connections transferring shear force or shear force combined with unbalanced moment. A yield line theory is proposed as an effective tool to predict the flexural failure load. The test results show that it is sufficient that the flexural failure load exceeds the punching failure load by 70%.

Lateral Postbuckling Analysis of Beam Columns

Abstract: This is a study of the elastic lateral post buckling response of a simply supported beam under uniform bending acting on the plane of major bending rigidity, in which the effect of an axial compreisson is also included. The study established the stability or instability of the critical state; the initial (nonlinearly elastic) postbuckling equilibrium path in an analytic form, using a nonlinear bending-moment-curvature relationship and linear kinematic relations; the margin of postbuckling strength or the degree of sensitivity to imperfections; and the elastic limit state design load.

An experimental investigation of free vibration response of curved sandwich beam with face/core debond

Abstract: The aim of this research was to investigate the curvature and face/core debond influence on the vibration behavior of curved composite sandwich beams made up of carbon/epoxy laminate skins over a polyurethane foam core. Flat and curved sandwich beams with debond were prepared by keeping the arc length of the sandwich beams equal to the length of the flat sandwich beams. Sandwich specimens with three different curvatures and debond between the top and bottom face/core were manufactured. Systematic vibration and static experiments were carried to determine the response and to study the effect of curvature and debond. Flexural stiffness and strength of the sandwich beams were determined by four-point bending tests. The natural frequencies and damping loss factors of the sandwich beams were determined using impulse frequency response technique under free—free boundary conditions. Four-point bending test results indicate that stiffness of the beams decrease with presence of debond. Vibration test results show ...