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推导了无黏结预应力混凝土桥墩的抗弯极限承载力的计算公式,分析了极限承载力与预应力钢筋面积、普通钢筋面积和混凝土强度等影响因素的关系.基于塑性铰法,对无黏结预应力混凝土桥墩的抗弯极限承载力进行研究,分析了各因素对抗弯极限承载力的影响.结果表明,增大普通钢筋面积和混凝土强度可以提高抗弯极限承载力;极限弯矩随着预应力钢筋的增多,先增大后减小.因此,对于预应力混凝土桥墩,增大普通钢筋配筋率对提高极限抗弯承载力最有效,但要控制预应力钢筋的数量.
The formulas of ultimate bearing capacity of unbonded prestressed concrete piers are deduced, and the relationship between ultimate bearing capacity and prestressed rebar area, normal rebar area and concrete strength is analyzed.Based on the plastic hinge method, The ultimate bearing capacity of the bridge is studied, and the influence of various factors on the ultimate bearing capacity of the bridge is analyzed.The results show that the ultimate bearing capacity can be enhanced by increasing the area of ordinary steel and the strength of concrete, For reinforced concrete piers, it is most effective to increase the ultimate flexural capacity of prestressed concrete piers, but to control the amount of prestressed steel.