Limit state theoretical and experimental investigation of corrugated sine-web under patch loading

Serhii Bilyk,Ihor Semchuk,Liudmyla Lavrinenko,Tetiana Nilova,Oleksii Nilov

doi:10.32347/2410-2547.2020.105.152-164

Serhii Bilyk, Ihor Semchuk + Show 3 more

Open Access

https://doi.org/10.32347/2410-2547.2020.105.152-164

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Abstract

The article researches the behavior and limit state of thin-web bedI-beams with transversal corrugations under patch loading action. Web local stability analysis was performed on beam models, which had been created according to standard corrugated profiles range of company Zeman. Numerical analyses on physical and mathematical models and experimental investigations on two physical models with similar to them parameters and steel were executed. The critical stress analyses were carried out via the finite elements method (FEM) with the assumption of steel elastic behavior accounting both geometric linearity and geometric nonlinearity. The calculation shows that taking into account the elastic behavior of steel the geometric nonlinearity has insignificant effect on the results. Two buckling forms (local and general for thicker webs) were ascertained while investigating the stability loss of web. The critical loading's value increases with increasing of purlin’s supporting length, but the web's critical stress decreases. But for all models critical stresses value is almost similar (tolerance is less than 0.36%) to steel yield strength fy= 305MPa. The numerical and experimental investigation results of corrugated web behavior under patch loading are presented. Established that model’s bearing capacity does not fail after reaching by theoretical and experimental normal stresses the ultimate strength of the web steel, and ultimate loading increases by 35 – 40 % due to the stress’s redistribution in the web along the length. The results of calculations and experiments certificates that when the strength requirement specified by Eurocode No. 3 is met the corrugated web’s bearing capacity will be alwaysensured.

Highlights

The concept of beams with thin transverse corrugated webs to improve their stability appeared in the 1930s
= 77,5 mm According to table results we can make conclusion, that beams with corrugated webs will be ensured from local buckling, when web stresses by design loads are less than yield strength
The bearing capacity of I-girders with a transversally corrugated thin web, under patch loading with every distribution length will be always ensured from failure if normal local stresses in the web do not exceed the steel yield strength

Summary

Introduction

The concept of beams with thin transverse corrugated webs to improve their stability appeared in the 1930s. 1. Web stability analysis A numerical analytic method for calculation of local stresses in steel beam corrugated web at the level, where it joins the flange, under patch loading, is presented in [1]. Is presented the results of numerical investigations via the finite elements method (FEM) of corrugated beam web limit state due to local stability loss under patch loading, distributed on the region, shown on fig. According to the 1st stage results analysis it was arranged, that critical stresses depends on web thickness, , and loading distribution region length,. In the local form of buckling the deformation region does not depend on the web height and thickness and starts directly under the compressed flange The shape of this region looks crumpled

Local buckling form LLLLLLLLLGLLLGG

Findings

Conclusions