【作者】 苏健；

【导师】 孙宗光；

【作者基本信息】 大连海事大学 ， 道路与铁道工程， 2012， 博士

【摘要】 预应力混凝土技术在土木工程领域得到广泛地应用,并取得丰富的研究成果。然而,在一些有关预应力混凝土结构力学性能方面,还存在着不同的观点、认识和研究结论。对一些基本问题的不同观点和认识,直接影响着预应力结构的设计理念和应用技术,有必要对有关问题作进一步细致研究。因此,本文对有粘结和无粘结预应力混凝土梁的主要力学性能进行了比较研究,主要内容和成果如下：1.针对国内外学者对有粘结与无粘结预应力混凝土梁的抗震性能所持的不同观点,对两种预应力梁进行了拟静力试验对比研究。通过试验,定量地描述了两种预应力梁在承载力、延性与耗能等方面的差异。在耗能和承载力方面,有粘结情况优于无粘结情况,等效粘滞系数平均高出29.2%,承载力高出7.4%；而在延性和变形恢复能力方面有粘结情况不如无粘结情况,延性系数平均降低8.8%；2.针对国内外学者对预应力混凝土梁的自振频率与张拉力关系的不同研究结论,通过动力特性试验和数值模拟,对自振频率与张拉力之间的相关性进行了研究。证实了二者之间的相关关系受结构参数影响,单纯的正相关或负相关的结论都是不全面的,即使是同一试件在不同张拉力下亦可能存在正负相关关系的拐点。在上述研究的基础上,探讨了基于自振频率的预应力混凝土梁的预应力识别方法；3.深入探讨了两组试件的孔道摩阻损失规律,比较了两组试件张拉反拱值的差异,在分析研究了张拉伸长值及其影响因素的基础上,给出一种张拉伸长值的简化测量与计算方法,简化算法可以有效准确地计算张拉伸长值；4.就有粘结预应力情况进行了灌浆试验。研究了灌浆材料及灌浆工艺对灌浆质量的影响。初步探讨了灌浆质量对预应力混凝土梁力学性能的影响,并给出了不同灌浆质量的预应力混凝土梁在耗能、延性、承载力等方面的差异。最后,对本文的研究成果进行了总结,并提出了需要进一步研究的问题。更多还原

【Abstract】 Prestressed concrete technology in the field of civil engineering is widely used, and has made a lot of research. However, people have different views on the understanding of the mechanical properties of prestressed concrete structure. These different views affect the design concept and application technology of prestressed structure. Therefore, further detailed study is necessary. So, this article studies the mechanical properties of prestressed concrete structure with bonded and unbounded prestressed concrete structure. The main research contents and results are as follows:1. Low cyclic loading tests on the seismic performance of the two specimens. The results describe the specific differences in carrying capacity, ductility and energy aspects of the two prestressed beams. The bond test results are compared to the unbounded specimen results:equivalent viscosity coefficient is 29.2% higher, bearing capacity higher than 7.4%, ductility coefficient was 8.8%lower;2. The study examined the relationship between the frequency and tensile strength. It also confirmed their relationship affected by the structural parameters; regardless of the positive or negative correlation conclusions, the results are incomplete. Even for the same specimen under different tension, it may exist at the inflection point between positive and negative correlation. The basis of the above study is to explore the prestressed identification method;3. The article discusses the channel frictional loss law, and compares the difference between the tensioned inverted arch values. The basis of the tensile value and its influencing factors is given to simplify the measurement and calculation methods of tensile values. The algorithm can effectively and accurately calculate the tensile values;4. This paper studies the impact of the grouting quality by the grouting material and grouting process. It also gives the differences of prestressed concrete beams of the different quality of grouting in the energy, ductility, bearing capacity.Finally, the research results are summarized and further research issues are raised.更多还原