钢与高强混凝土预应力组合梁滑移性能试验研究

为了对钢与高强混凝土预应力组合梁的受力性能做出正确评价,在试验基础上,根据其实际受力特征以及组合梁弯矩与曲率关系、交接面应变变化及内力平衡条件,建立预应力组合梁在不同载荷作用下交界面滑移计算公式,以承受对称集中荷载为例,理论公式的计算结果与试验结果吻合良好.研究结果表明,交接面相对滑移沿梁长分布呈现出中间大,两端小的鼓状分布;在其他条件相同情况下,交界面滑移随着连接刚度增大而减小.

Experimental Studies on Slip Behavior of Prestressed Steel-HS Concrete Composite Beams

To evaluate correctly the bearing capacity of a prestressed steel-HS concrete composite beam on experiment basis,the formulas to calculation the slip on steel/concrete interface in the composite beam are derived according to actual loading conditions,with the moment-curvature relationship,the change of interface strain and balance condition of internal force taken into account.The calculated results conform well to the experimental ones.It is indicated that the steel bar slip relative to concrete on steel/concrete interface is in a barrel-like distribution along the beam length,i.e.,big at middle and small at both ends.In addition,the slip on interface decreases with increasing connection stiffness under otherwise equal conditions.