无粘结部分预应力混凝土梁裂缝宽度的计算

Calculation of Crack Width of Unbonded Partially Prestressed Concrete Beams

本文通过14根无粘结部分预应力混凝土梁的试验,探讨了在使用阶段允许出现裂缝的无粘结部分预应力混凝土梁的裂缝分布和开展以及无粘结预应力钢筋应力的变化规律。在试验和理论分析的墓础上,提出了无粘结部分预应力混凝土梁裂缝宽度的计算方法。建议方法的计算值与试验结果符合较好,并与有粘结部分预应力浪凝土梁裂缝的宽度的计算方法形成统一的计算体系。

Based on the test results of 14 unbonded partially prestressed con crete beams, the distribution and development of the cracks and the stress of the unbonded bars of the beams are investigated under service load. According to the test results and theoretical analyses, a method of calculating the crack width of unbonded partially prestressed concrete beams is presented. The values calculated are in good accordance with the test results, and a unite calculation system can be formed by combining this method with the one for bonded partially prestressed concrete beams.