斜腹板钢桁架加固混凝土框架柱的计算与分析

发布时间：2018-11-13 14:00

【摘要】：钢筋混凝土结构在建筑行业中的发展应用虽然只有100多年历史,但到目前为止,钢筋混凝土结构已成为我国应用最多的一种结构形式,与此同时,中国也是世界上使用其最多的国家。然而钢筋混凝土结构的使用寿命受外界影响较大,如材料和施工质量不满足要求使建筑物处于亚状态,潮湿的使用环境、混凝土开裂等会加速钢筋的锈蚀,地震等自然灾害更是直接缩短了其使用周期。在我国,一般民用建筑的设计基准期为50年,重要建筑的设计基准期为100年。那么以设计基准期推算,已有的混凝土结构,目前大多数正处在维修加固和改造的高峰时期。然而作为一门新兴学科—混凝土结构加固学,仅是近十几年才提及的事,结构试验研究、理论分析及规范编制等基础理论工作,目前均处在起步阶段。因此,进行相关方面的计算和研究来填补目前加固领域的不足是迫在眉睫的事。鉴于外包钢加固法具有技术成熟、受力可靠、施工简便、现场工作量小等优点,本文针对斜腹板钢桁架加固混凝土框架柱主要进行了三个方面的研究：(1)推导加固柱截面等效抗弯刚度和等效抗压刚度的计算公式,并验证其可行性；(2)模拟水平往复荷载和不同轴压作用下,钢筋混凝土框架柱及其斜腹板钢桁架加固柱的受力性能；(3)模拟水平往复荷载和同一轴压作用下,当外包角钢截面面积相同,肢长、肢厚不同时对钢筋混凝土框架柱加固效果的影响。经计算及ABAQUS模拟分析表明：(1)加固柱截面等效抗弯刚度EI等于考虑刚度退化后的钢筋混凝土柱截面抗弯刚度ηEcIc与斜腹板钢桁架加固构件的弹性抗弯刚度EgIg之和,加固柱截面等效抗压刚度EA等于钢筋混凝土柱截面抗压刚度EcAc与斜腹板钢桁架加固构件的抗压刚度EgAg之和；(2)随着轴压比的增大,混凝土框架柱及其斜腹板钢桁架加固柱的极限承载力逐渐增大,但耗能能力和抗震性能逐渐变小；(3)斜腹板钢桁架对钢筋混凝土框架柱有较好的加固效果,使其具有更高的极限承载力、耗能能力和抗震性能；(4)当外包角钢截面面积相同时,改变其肢长、肢厚对斜腹板钢桁架加固柱的极限承载力、耗能能力及抗震性能几乎不产生影响。经计算分析表明：斜腹板钢桁架加固混凝土框架柱可以明显提高原混凝土框架柱的极限承载力、耗能能力和抗震性能,是一种行之有效的加固方法,应广泛应用于实际的维修加固工程当中。
[Abstract]:Although the development and application of reinforced concrete structure in the construction industry is only over 100 years old, the reinforced concrete structure has become one of the most widely used structural forms in China, at the same time, China is also the world's most used country. However, the service life of reinforced concrete structure is greatly affected by the outside world, such as the material and construction quality does not meet the requirements to make the building in a sub-state, wet use environment, concrete cracking and so on will accelerate the corrosion of steel bars. Earthquake and other natural disasters are directly shortened its life cycle. In China, the basic design period of general civil buildings is 50 years, and that of important buildings is 100 years. Based on the design reference period, most of the existing concrete structures are in the peak period of repair and reinforcement. However, as a new discipline, the reinforcement of concrete structures is only mentioned in the past ten years. The basic theoretical work, such as structural test research, theoretical analysis and standardization, is now in its infancy. Therefore, it is urgent to make relevant calculation and research to fill the deficiency in the field of reinforcement. In view of the advantages of outsourced steel reinforcement method, such as mature technology, reliable force, simple construction and small workload, etc. In this paper, three main aspects of reinforced concrete frame columns strengthened with inclined web steel truss are studied: (1) the equivalent flexural stiffness and equivalent compressive stiffness of reinforced columns are derived, and the feasibility is verified; (2) simulating the mechanical behavior of reinforced concrete frame column and steel truss reinforced column with inclined web under horizontal reciprocating load and different axial compression; (3) under the same axial compression and horizontal reciprocating load, the reinforcement effect of reinforced concrete frame column is affected by the same cross section area, long limb and different limb thickness. The results of calculation and ABAQUS simulation show that: (1) the equivalent flexural stiffness (EI) of reinforced concrete columns is equal to the sum of the flexural stiffness 畏 EcIc of reinforced concrete columns and the elastic flexural stiffness EgIg of steel truss members strengthened by inclined web steel truss. The equivalent compressive stiffness (EA) of the reinforced column section is equal to the sum of the compressive stiffness (EcAc) of the reinforced concrete column section and the compressive stiffness (EgAg) of the steel truss members strengthened with inclined web plates. (2) with the increase of axial compression ratio, the ultimate bearing capacity of concrete frame columns and steel truss reinforced columns with inclined web plate increases gradually, but the energy dissipation capacity and seismic performance become smaller; (3) the steel truss with inclined web plate has better reinforcement effect on reinforced concrete frame column, which makes it have higher ultimate bearing capacity, energy dissipation capacity and seismic performance; (4) when the cross section area of angle steel is the same, the ultimate bearing capacity, energy dissipation capacity and seismic performance of inclined web steel truss strengthened column are almost unaffected by changing the limb length and limb thickness. The calculation and analysis show that reinforced concrete frame columns with inclined web steel truss can obviously improve the ultimate bearing capacity, energy dissipation capacity and seismic performance of the original concrete frame columns, so it is an effective reinforcement method. It should be widely used in practical maintenance and reinforcement projects.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375

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