| The reinforced masonry shear wall can be regarded as a combined structure composed of masonry and reinforced concrete core columns.Some scholars have improved the mechanical performance of the wall by constructing c ore columns with a uniform cross-section.I-type blocks are blocks dedicated to the construction of reinforced masonry shear walls.The proposed block is to further change the mechanical performance of the reinforced masonry shear wall by increasing the cr oss-sectional area of the core column and arranging reinforcement according to the cast-in-place shear wall.There are two problems to be solved in the design of the I-type block reinforced masonry shear wall.First,due to the special geometric form of th e I-type block,the traditional calculation method of compressive strength of grouted masonry can not be directly used,and the theory describing the compressive performance of grouted masonry made of this new type of bloc k needs to be improved.Second,the response of such core-column-enhanced masonry shear wall under the horizontal force needs further study,to analyze the similarities and differences between this kind of wall and the traditional reinforced masonry,and modify the design theory.Given the above two problems,this article will be divided into two parts based on th e experiment.The first part focuses on solving the problem of the stress-strain law of the I-type block grouted masonry under compression.In this part,the concept of the I-type mechanical element is first proposed.By comparing the axial compression test phenomena of three 9 specimens with the relevant literature,it is proved I-type mechanical element can better characterize the axial compression performance of grouted masonry.Based on this element,combined with the theory of concrete compression softening,the calculation method of compressive strength,elastic modulus and the stress-strain relationship of the axial compression of the grouted masonry is derived.Comparing the calculation of 180 axially compressed specimens,including the specimens in this article,the average value of the measured/calculated ratio of compressive strength is 1.01.the variation coefficient is 0.14.The average value of the measured elastic modulus/calculated elastic modulus is 1.11,the variation coefficient is 0.16.It proves that the theoretical system based on basic mechanics element and concrete soften theory not only solves the calculation method of mechanical parameters of I-type block grouted masonry under compression,but also generalizes the grouted masonry with similar internal structure.The second part is the experimental study of the reinforced masonry shear wall.In Chapters 4 to 6,the performance of the 6 I-type block reinforced masonry shear walls under low-cycle repeated loading is studied,and some residual walls are subjected to the push-over test.Through the hysteretic curve recorded by the test,the energy dissipation capacity and deformation capacity of the wall are studied.According to the characteristics of the hysteretic curve,the hysteresis rule of the I-type block masonry shear wall is given.Based on the analysis of wall crack distribution,failure mode,and deformation characteristics,the influence of enhanced core column on the resistance mechanism of reinforced masonry shear wall is discussed.It is pointed out that the gradual failure of multiple resistance mechanisms brings “redundancy” to the wall.Based on the research of the constitutive law and the deformation characteristics of the wall,the calculation theory of the test wall is proposed.Based on the characteristics of crack development and failure mode during the test,the damage analysis of the wall is carried out.In Chapter 7,the construction technolog y is discussed in combination with the special geometric form of I-shaped block.According to the characteristics of the internal structure,there is a "self-locking" feature between the reinforcement in the wall and the ungrouted masonry part.According to this feature,the construction process is improved. |
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