Investigations Into The Resistance of Sin Girders Reinforced With Tensioned Diagonal Braces

Period. Polytech. Civil Eng.

2019

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This study reports investigations into the effect of relative flexural stiffness of intermediate stiffeners γ on the failure zone location in the corrugated web. The study also aimed at obtaining stiffness criterion for intermediate stiffeners that depends on the magnitude of the plate geometry parameter α. To achieve the goals of the study, experimental investigations were conducted into load displacement paths of four exemplary SIN girders. They were simply supported girders, made to full scale, and composed of pre-assembled units. The phenomena occurring in the experiment were represented using the Finite Element Method. For FEM numerical analysis of girders with intermediate stiffeners, models with the web height of 1000, 1250 and 1500 mm, made from 2; 2.5 and 3 mm thick corrugated sheet metal were used. Due to the analysis of 52 girder numerical models, it was possible to propose the stiffness criterion of intermediate stiffeners. The criterion was based on the assessment of shear buckling strength of the corrugated web. Using the regression method, dimensionless coefficients of the stiffener stiffness ks dependent on the optimum stiffness γ were determined. Based on estimated coefficients of the stiffener stiffness ks, the absolute minimum stiffness of intermediate stiffeners Ismin used in corrugated web plate girders was calculated. It was demonstrated that the use of an intermediate stiffener, the stiffness of which is greater than Ismin , additionally leads to a change in the location of the site of the web shear buckling.

Section: Discussionmentioning

confidence: 99%

“…This area can be secured with, e.g. tension diagonal braces, and the overall girder bearing capacity can be enhanced [27]. Results and evaluations of adopted solution Both experimental girders and numerical models failed in the area under the constant action of shear force.…”

Section: Failure Modes In Numerical Models Of Girdersmentioning

confidence: 99%

Design of Transverse Stiffeners in Plate Girders with Corrugated Web

Period. Polytech. Civil Eng.

2019

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“…In order to equalize flexural and shear resistance of corrugated web girders, it should be postulated that tension diagonal braces are employed. They need to be used in the girder near-support zones [28,29], in which the shear load is greater than the web shear resistance.…”

Section: Discussionmentioning

confidence: 99%

Shear Buckling of Plate Girders with Corrugated Web Restrained by End Stiffeners

Period. Polytech. Civil Eng.

2018

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The study reports the investigations into the effect produced by flexural stiffness of end stiffeners on the design buckling resistance of the sine wave webs of girders. Experimental investigations were concerned with load displacement paths in sinusoidally corrugated web girders, composed of structural items and made to the full scale . The phenomena occurring in experimental investigations were represented using the Finite Element Method. In numerical models based on FEM analysis, the same failure modes of webs that were found in experimental investigations into corrugated web girders were accounted for. FEM numerical analysis was performed for girder models with webs 500, 1000, 1250 and 1500 mm in height, made of corrugated sheet metal 2, 2.5 and 3 mm in thickness. On the basis of laboratory tests and FEM analysis, a new method for estimating design shear buckling resistance for girders with semirigid and rigid end stiffeners was proposed. The method relies on the determination of interactive buckling resistance. The solution presented in this study was compared with formulas currently used for buckling resistance estimation. It was shown that the use of girder rigid end stiffeners produces in increase in shear buckling resistance up to 11%. Conclusions were drawn and recommendations were made with respect to the sizing of sine wave corrugated web girders with semirigid and rigid end stiffeners.

“…In study [5], it was shown that rigid vertical stiffeners installed at the ends of simply supported girders substantially increase the critical shear resistance of the corrugated web. On the basis of [2], it was demonstrated that tension diagonal braces used in near-support zones of SIN girders significantly increase the shear resistance of the corrugated web, thus making it possible to adjust the span of SIN girders to the span resulting from pure bending. In FEM numerical models, different web failure modes, observed in physical experimental research into SIN girders were taken into consideration [2].…”

Section: Introductionmentioning

confidence: 99%

“…On the basis of [2], it was demonstrated that tension diagonal braces used in near-support zones of SIN girders significantly increase the shear resistance of the corrugated web, thus making it possible to adjust the span of SIN girders to the span resulting from pure bending. In FEM numerical models, different web failure modes, observed in physical experimental research into SIN girders were taken into consideration [2]. That was done depending on the inclination angle β β of tension diagonal braces and the web thickness, namely: 1) when the inclination angle of diagonal braces β < 45°, the web yield along diagonal braces occurred, which correlated with a major increment of force in tension diagonal braces, 2) when the inclination angle of diagonal braces β > 45°, the web buckling between diagonal braces and flanges occurred.…”

Section: Introductionmentioning

confidence: 99%

Fem Analysis Of Corrugated Web Girders Reinforced With Tensioned Diagonal Braces

Architecture, Civil Engineering, Environment

Kowal

2017

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The study presents the application of FEM numerical analysis, performed with the Abaqus software [1], for theoretical estimation of the ultimate and critical shear and flexural resistance of corrugated web girders reinforced with tension diagonal braces. In FEM numerical models, different web failure modes, observed in physical experimental research into SIN girders were taken into consideration [2]. That was done depending on the inclination angle β of tension diagonal braces and the web thickness. FEM analysis of the shear resistance of corrugated web girders was performed using numerical models of girders. The webs, made from corrugated sheet, had the heights of 500, 1000 and 1500 mm, and the thicknesses of 2; 2.5 and 3 mm. Global shear and flexural load-displacement paths (LDPs) were determined for girder numerical models. In shear LDPs, the shares of cooperation between the corrugated web and tension diagonal braces were separated. For each numerical model, the estimates of the share of the corrugated web and diagonal braces in the shear resistance of SIN girders were produced. The results of the FEM numerical analysis of the resistance of corrugated web girders reinforced with tension diagonal braces were compared to the results of physical experimental research [2] into the girders of concern, and also with the results of calculations made for unreinforced girders acc. EC3 [19]. Conclusions were drawn and recommendations were produced, which can be applied to the construction and dimensioning of corrugated web girders reinforced with tension diagonal braces. The Abaqus software was adjusted to solve the problems related to the phenomena revealed by the research [2].