In the case of both narrow panels and large panels, the CLT panel, which is the load bearing wall, may be provided with a small opening for building equipment. In this study, in order to confirm the influence of the presence and the position of the small opening on the yield strength and stiffness under the bending test and the shear test of the CLT panel with the small opening were conducted. This report reports on test results and their considerations.
Test results and calculated values were compared for the value of the moment of inertia when the specimen was considered as a uniform cross section over the entire length under the bending test. Although the moment of inertia calculated by calculation substantially matches the one obtained by the test result, the moment of inertia I' of the notched portion of the specimen having a shape in which either upper or lower of the specimen is cut out Is overrated. They matched when I' was set to 0.6 times when there was a notch. Although it is necessary to study the adjustment coefficient in the future. If there is a notch on the top and bottom, calculating as a simple cross-sectional defect may result in a dangerous side.
Regarding the shear elastic modulus, the shape that is cut out at the top of the specimen is slightly higher than the other shapes and tends to be slightly lower in the case of the central opening, but is considered to be within the range of variation.
The bending strength was calculated from the bending test results. Although there was no significant difference in bending strength depending on existing or no opening and the position of the opening, the bending strength of the specimen with the opening at the upper end had a value of 1.43 times. In addition, comparing the two specimens in which the opening position is vertically symmetrical, the value of the specimen with the opening on the upper side was somewhat lower. In order to confirm the influence of the fluctuation of the test piece strength on the calculation result, the bending strength was calculated on the assumption that all the test pieces were damaged with the same strain. It almost agreed with the bending strength calculated from the test results. It can be confirmed that the failure occurred at a somewhat low strain in the specimen with the opening at the center in the beam depth.
The shear strength calculated from the shear test results does not show large deference due to the existing or no opening and the position of the opening. If the size of the opening this time, it was shown that the shear strength could be obtained by simple calculation without depending on the position of the opening.
