本文给出二批钢筋混凝土梁及四批未裂缝和已裂缝的预应力混凝土梁在长期荷载作用下的挠度和裂缝宽度试验结果。六批试验共持续14年。所有挠度增长曲线下面都绘出了相应的温湿度变化曲线。在附录中还对已裂缝的钢筋混凝土梁提出实用的刚度计算建议,建议公式是与规范TJ 10-74公式相衔接的。根据国内外182根梁长期荷载试验结果的验算表明,建议公式是适用的。 This paper presents the test results of the deflection and crack width of two batches of reinforced concrete beams and four batches of prestressed concrete beams without cracks and cracks under long-term loading. Six batches of tests lasted 14 years. The corresponding temperature and humidity curves are plotted below all deflection growth curves. In the appendix, a practical stiffness calculation proposal is also proposed for cracked reinforced concrete beams, and the proposed formula is linked to the specification TJ 10-74 formula. According to the calculation of the long-term load test results of 182 beams at home and abroad, the proposed formula is applicable.