Abstract
Based on the research of composite walls at home and abroad, a construction method of continuous opening of the insulation layer in the specimen is proposed. In the edge component of the composite wall, the insulation layer should be thinned appropriately, the concrete on both sides should be thickened correspondingly, and U-shaped reinforcement should be used instead of stirrup. To study its axial compression test performance, five 1/2 scale composite shear wall specimens are tested under axial compression, including three composite wall specimens and two solid wall contrast specimens. The failure mode, load-bearing performance, deformation performance, and the collaborative work performance of wall are analyzed. The results show that the failure characteristics of the composite shear wall are similar to those of the solid wall, with splitting cracks at the corners and inverted triangular conical splitting at the top of the wall along the wall height direction, with no obvious bulging in the middle of the wall. The tie action of the ribs makes the concrete walls on both sides of the composite shear wall have good integrity and cooperative performance; the installation of the thermal insulation layer increases the overall thickness of the wall, improves the stability of the composite wall, and makes the composite wall axially compressed. The bearing capacity is not significantly reduced compared to the solid walls. Finally, according to the test results, the calculation formula of axial compression bearing capacity of composite shear wall is given, which provides the basis for the formulation of the code and engineering application.
Highlights
Results and DiscussionFrom the analysis of the failure process and failure mode of the specimen, it can be seen that the crack development of the specimen is basically consistent in the stress process, and the stress characteristics can be divided into three stages:
Song et al [17] carried out experimental research on seismic performance of thermal insulation composite shear wall. e composite wall structure with longitudinal stiffeners was studied in reference [18, 19]
5 1/2 scale shear wall specimens are designed to test the axial compression performance of the composite wall by connecting the middle insulation layer of the composite wall and considering the structural measures such as increasing its thickness and replacing the stirrups of the edge members with U-shaped stirrups. e analysis of the failure process and failure pattern, bearing capacity, deformation performance, and wall cooperative performance are analyzed. e calculation formula of axial compression bearing capacity is put forward, which provides the basis for the theoretical research and engineering application of the composite wall
Summary
From the analysis of the failure process and failure mode of the specimen, it can be seen that the crack development of the specimen is basically consistent in the stress process, and the stress characteristics can be divided into three stages:. (1) In the elastic stage, before the axial load reaches the cracking load, there is no obvious phenomenon in the wall, and the load-displacement curve is approximately linear. After the cracking load is reached, vertical cracks with a length of about 8 cm appear at the top corner of the wall on one side of W1 and W2. With the increase of the load, the microcracks on both sides of the wall increase, and the crack width develops, about 0.1 mm∼0.15 mm; W3, W4, and W5 along the wall height, there are many vertical cracks in the width range of the wall side, mainly concentrated in the width range of the insulation layer, continue to load, the vertical cracks in the insulation layer area are almost full along the
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