The growth of solder joint interface layer is closely related to the reliability of solder joints. In this work, the growth behavior of the interfacial intermetallic compounds layer between Sn-3Ag-3Sb-xIn/Cu (x=0, 1, ...
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This research experimentally studied the bond behavior of laminated bamboo (LB) plate to concrete interface. Totally forty-five single shear pull-out specimens, which were categorized in nine groups, were prepared and...
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This research experimentally studied the bond behavior of laminated bamboo (LB) plate to concrete interface. Totally forty-five single shear pull-out specimens, which were categorized in nine groups, were prepared and tested to determine the bond characteristics. Plate thicknesses, plate widths and bond lengths were the three major parameters considered in the specimen preparations. It was found that debonding in concrete near the concrete-adhesive interface often occurred in the specimens with bond length less than 150 mm, and a mixed failure mode of debonding at the bamboo plate-adhesive interface and debonding in concrete was observed in most specimens with bond length equal to and over 150 mm. The coefficient of variation of the LB-concrete bond specimens was lower than such value of similar FRP-concrete bond specimens. This confirmed that the interfaces of LB plate to concrete can exhibit sufficient reliability for engineering applications. The models for predicting peak load, effective bond length and bond stress-slip curve, originally used for FRP bonded concrete specimens, were calibrated for LB bonded concrete specimens based on the test results. Compared with other models, the models proposed by Teng et al. and Zhou were more accurate for the prediction of the peak load and effective bond length of the LB bonded concrete specimens. Classical power function model with a linear descending branch was able to effectively describe the nonlinear bond stress-slip curves and achieved good agreement with test results.
An innovative externally-hung rocking wall (ERW) with shape memory alloy (SMA) and disc spring self-centering devices for retrofitting existing structures was proposed in this paper. By arranging steel corbels on the ...
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An innovative externally-hung rocking wall (ERW) with shape memory alloy (SMA) and disc spring self-centering devices for retrofitting existing structures was proposed in this paper. By arranging steel corbels on the columns of an existing structure, the rocking walls were connected to the corbel using H-shaped connectors. Two types of self-centering devices, using disc spring and SMA separately, were installed between rocking wall and foundation to prevent collision damage, and can provide self-centering capability for the structure. The seismic performance characteristic of the ERW structure was studied via a shaking table test. For comparison, an unretrofit control (UC) structure was also tested. The UC structure was severely damaged and nearly collapsed after PGA = 1.2 g test cases: some steel bars at the bottom of the beam were fractured, and concrete at the beam end and column foot were crushed. For the ERW structure, the damage was significantly reduced after PGA = 1.5 g test cases: there were some cracks appeared in the structure, and concrete at the column foot were slightly crushed. However, no obvious damage was observed in the self-centering devices. The maximum story drift and residual deformation of the ERW structure are reduced 86.7% and 91.2%, respectively, relative to the UC structure.
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