Abstract
This study is to follow the same titled study of the previous year. The fundamental efficiency of various materials of dowels and the properties of flexure of latticed beams can be clarified by the previous study. Main purpose of the study this year was to construct a full-size falsework. In order to supplement the data of the previous study, the bending test of framed single beams and flexure test of latticed beams were carried out. As for the bending test of framed single beams, firstly we examined the diameter of bolts and effects of adhesives. Tests of bolts with the diameter of 8mm and 12mm have shown that within the practical flexure limit of this system, there is hardly any direct effect of the diameter of bolts and that the bolt with 8mm diameter can sufficiently be of use. And it was clarified that its stiffness becomes approximately twice when used in combination with adhesives. When compared with the experimental data of the previous study under the same conditions, the stiffness of the framed single beams tested this year is approximately twice. Secondly, at the site of Tokyo Lumber Service Center in Shiomi, Koto-ku, a full-size, two-storied falsework with three layered lattice was built up and the data on its execution was obtained. Fairly low cost of processing and manufacturing of wood members will be realized by application of the processing machines. On the other hand, building up at the site has a disadvantage that we cannot obtain fixed horizontal measurements before actual layering. It also has the same problem with the vertical measurements. The framed single beams require supports until the end of the built up. The test of flexural ability was carried out for added vertical force first with the built up falsework and then with its disjointed wood members built up again in a falsework. Through this test, the relationship between the distribution of load and the flexure was examined. In parallel with above tests, analysis program of latticed beams was applied to the data of framed single beams. According to the resulting data, it has shown that in cases of even-distribution of load, the flexure of latticed beams can be simulated if the conditions are set up to some degrees. Based on this result, we applied the latticed beams to general housing plans. It has shown that within the average live load, the flexure can be controlled within 2cm in case of span of 3600mm.
