Experimental study on bending performance of partially semi-wrapped partially-encased composite beam with steel and concrete
In addressing the issue of inadequate compaction of post-poured concrete in the joint area of partially-encased composite beam-column joint with steel and concrete,the impact of tensile-side concrete on the bending performance of partially semi-wrapped partially-encased composite beam with steel and concrete(partially semi-wrapped PEC beam)was studied.Two partially semi-wrapped PEC beams with different configurations underwent four-point bending tests to simulate the loading conditions in the negative bending moment region of partially semi-wrapped PEC beams.A comprehensive analysis was conducted on their bending performance,ductility,and failure modes.The results show that the partially semi-wrapped PEC beam exhibit excellent ductility,and the bending capacity of the cross-section does not decrease when the deflection reaches l0/50.The strain distribution of the main steel section and concrete roughly follows a linear trend along the height of the cross-section,and the plane section assumption can be used to calculate the bending capacity and stiffness.The influence of tensile-side concrete of partially semi-wrapped PEC beam on their ultimate bearing capacity and failure mode is minimal.When calculating the stress of partially semi-wrapped PEC beam-column nodes,the effect of tensile-side concrete can be neglected,and the post-pouring area of the joint can be filled with semi-encased concrete to expedite construction progress.Additionally,modeling of partially semi-wrapped PEC beams was conducted,followed by finite element analysis of the beams under bending.A comparison of the simulation results with experimental outcomes showed good agreement,with the load-deflection curves closely aligned and errors consistently within 10%.
partially semi-wrapped partially-encased composite beam of steel and concretedamage modebending capacityductility
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