Abstract
A methodology is presented for analytical calculation of creep behavior of plane frames made of glass fiber reinforced polymer (GFRP) profiles and an experimental study is carried out in order to evaluate the analytical calculation results. In order to account nonlinear viscoelastic material behavior, stress – strain – time relationship of plane frame is given and creep behavior of plane frame structure is investigated. Material coefficients for the creep functions are determined using three point beam bending test results. In order to validate the analytical approach, a plane frame made of GFRP profiles is tested under sustained loads for 100 days and displacements, strains are monitored. Strain and displacement values that are calculated using analytical method show good agreement with the full-scale test data. DOI: http://dx.doi.org/10.5755/j01.mech.23.3.14029
Highlights
Bending moment of the column sections, which are for 300 mm lower from beamto-column connection and 300 mm over the base plate of the column, increases. These results shows that timedependent behaviour of glass fiber reinforced polymer (GFRP) profiles are affecting the structural behaviour of frames
A plane frame made of GFRP profiles is tested under sustained loads and strain, deflections are monitored
An analytical method is presented for calculation of strain and deflections for the GFRP frame
Summary
Stress – strain – time relationship for nonlinear viscoelastic material is accounted as below [12]: σ t. Where σ(t) is time-dependent stress function; Bi (ε) is mechanical properties of the material related to deformation level; gi (t) is time function selected to reflect the behaviour. Where t is time, ki, pi and λi are material properties, ε is strain. If βi is assumed as linear viscoelastic and the mechanical properties as deformation level n. Since stress – strain – time relation is given in Eq (4), stress and ε t z. Where σ(t) is time-dependent stress function, Bi (ε) is mechanical properties of the material related to deformation level, gi (t) is time function selected to reflect the behaviour, Ωx(t) is time-dependent curvature function, z distance to the neutral axis. If functions given with Eq (2) are inserted into Eq (9) and calculations steps are performed with writing
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