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根据CAN/CSA-N287.7-96《加拿大重水铀反应堆核电厂混凝土安全壳结构的在役检查和试验要求》的推荐制作两根标准试验梁,一根为有粘结预应力系统,一根为无粘结预应力系统,进行长期预应力损失监测、承载力试验和一系列的材料性能试验,对比两种试验梁的预应力损失规律,估算预应力损失,验证混凝土的收缩、徐变、预应力钢束的松弛等因素在实际的预应力损失中的比重。试验结果表明:由后张法建立的预应力系统,有粘与无粘的预应力损失规律相似,孔道灌浆对预应力的影响不大,主要起到对钢绞线的保护作用,锚固作用不明显;无论有粘无粘,预应力都由端部锚垫板对梁的轴向压力形成,预应力的传力方式非常相似;通过对本次试验的大量监测数据进行分析,用监测无粘结钢束的预应力损失间接反映有粘结钢束的预应力损失的方法是可行的。
Two standard test beams were made according to CAN / CSA-N 287.7-96, “In-service Inspection and Test Requirements for Concrete Containment Structures of a Canadian Uranium Reactor Nuclear Power Plant”, one for bonded prestressed systems and one for For the unbonded prestressed system, long-term monitoring of prestress loss, bearing capacity test and a series of material properties tests were carried out. The law of prestress loss was compared with the two test beams to estimate the prestress loss and to verify the concrete shrinkage, creep, Prestressed steel beam relaxation and other factors in the actual prestress loss in the proportion. The test results show that the prestressed system established by the post-tension method is similar to the prestressed loss of sticky and non-sticking, and the effect of hole grouting on prestressing is small, which mainly plays the role of the protection of the strand. The anchoring effect Obviously, no matter sticky or non-stick, the prestressing force is formed by the axial pressure of the end anchor plate on the beam, and the force transmission of the prestressing is very similar. By analyzing a large amount of monitoring data of this test, The prestress loss of the knotted steel bundles indirectly reflects the method of prestress loss of the bonded steel strands.