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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。
In this paper, 14 unbonded partially prestressed concrete beams were tested to investigate the crack distribution and development of unbonded partially prestressed concrete beams that allowed cracks at the service stage and the variation of stresses in unbonded prestressed steel bars. Based on the tombs of experiments and theoretical analysis, the calculation method for crack width of unbonded partially prestressed concrete beams is proposed. The calculated values of the proposed method are in good agreement with the test results, and form a unified calculation system with the calculation method for the width of cracks in pre-stressed corroded soil beams with bonded parts.