Study on Bending Behavior of Basalt Fiber Reinforced Polymer Pultruded Circular Tube
To optimize the design of basalt fiber reinforced polymer(BFRP)pultruded circular tube and promote its application in bridge engineering,a three-point bending test of two BFRP pultruded circular tubes with a length of 750 mm was carried out.Then,test process was numerically simulated in LS-DYNA software to verify the correctness of the finite element simulation.When the skin thickness of BFRP pultruded circular tubes was kept constant,the influences of thickness and laying angles of the inner and outer bidirectional fiber cloth on the bending capacity of the tubes were examined.It is shown that the specimens underwent three stages from the beginning of load application to failure,including the elastic,falling and residual stages.The failed tubes still had great residual strength,and rapidly returned to its original geometry after de-loading.The simulated load-slip curves and failure modes agreed well with the test results,proving the correctness of the finite element modeling.Adding inner and outer bidirectional fiber cloth with proper thickness can improve the bending capacity of the tubes,and when the laying angle of the inner and outer fiber cloth was changed from 90° to 45°,the bending capacity gained a further increase.As the thickness of the outer fiber cloth laid at an angle of 45°increased,the deflection of the failed tubes decreased.It is recommended to add proper amount of bidirectional fiber cloth while manufacturing the BFRP pultruded circular tubes,at a laying angle of 45°.
万方数据
维普
