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A delaying and neutralizing procedure of bending brittle fracture of glulam beam with inserted steel plates

镶钢板胶合木梁弯曲脆性断裂的延迟和中和工艺

基本信息

批准号：
15560392
负责人：
USUKI Seizo
金额：
$ 2.37万
依托单位：
Akita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

项目摘要

The glulam beams having a cross section of 120mm × 60mm and a span of 216cm (the span by beam height equals 18) are arranged and the steel plates having a section of 40mm × 9mm are inserted to upper slits of beams and are glued with epoxy resin. On the other hand, one steel plate having the same section as upper steel plate is inserted and glued to lower slits of beams (Type-A), two steel plates having a section of 40mm × 4.5mm are inserted and glued to those (Type-B) and finally, three steel plates having a section of 40mm × 3mm are inserted and glued to those (Type-C). As a results, three types of glulam beams having different inserted steel plate layout in tension sides of beams are provided and tested under consentrated load at mid span.Then, these have same bending rigidity, as they have same cross sectional area of steel plates in tension sides of beams. The average ultimate load of three Type-A beams is 25.9kN, that of Type-B is 27.1kN and that of Type-C is 30.7kN, respectively. The different of these ultimate loads are depending to yield points of steel plates. This is no doubt, as the load-srain curves of Type-A, B, C reveal non-linearity at different loading points of the curves. The ductile capacity is also follow the order of Type-C, Type-B and Type-A.As a conclusion, if the glulam beams have same bending rigidity, the type having multiple inserted steel plates in tension side are superior in engineering ability.

设置了截面为120 mm×60 mm、跨度为216 cm(梁高跨度为18)的胶合板，将截面为40 mm×9 mm的钢板插入梁的上部缝隙中，并用环氧树脂粘接。另一方面，将与上钢板具有相同截面的一块钢板插入并粘贴到梁的下部狭缝(A类)，将两块截面为40 mm×4.5 mm的钢板插入并粘贴到梁(B类)上，最后将三块截面为40 mm×3 mm的钢板插入并粘贴到梁(C类)上。结果表明，三种不同插板方式的胶合板梁在跨中集中荷载作用下具有相同的抗弯刚度，其受拉边钢板截面积相同。A型梁、B型梁和C型梁的平均极限荷载分别为25.9kN、27.1kN和30.7kN。这些极限荷载的不同取决于钢板的屈服点。这是毋庸置疑的，因为A、B、C型的载荷-应变曲线在曲线的不同加载点表现出非线性。延性能力也依次为C型、B型、A型。因此，在抗弯刚度相同的情况下，受拉侧多块钢板插板的胶合板梁型具有较好的工程性能。