ABSTRACT

When glued-laminated timber are subjected to bending moment, they usually fail in a brittle way in the tension zone before the compressive zone reaches the compressive strength of wood. This means that the compression strength of wood is not fully exploited. By reinforcing the tension zone, the failure mode of glued-laminated timber can be changed from tensile to compressive. As a result, by utilizing the higher compressive strength, reinforced glued-laminated timber become stronger and the failure mode becomes compressive and ductile. This paper presents experimental results of the effect of steel reinforcements in the tension zone of glued-laminated timber. Four passively reinforced beams, four actively reinforced beams, and seven unreinforced beams were tested to failure in four-point bending tests. The experimental results confirmed the brittle tension failure in the unreinforced beams as well as the ductile and compressive failure in the reinforced beams. Furthermore, the experiments revealed the increase of the passively and the actively reinforced glued-laminated timber relative to the reference beams for strengths (26% and 39%) and stiffnesses (30% and 11%). Ductilities were increased from 7.7% for the reference beams to 90% and 75% for the passively and the actively reinforced glued-laminated timber, respectively.

摘要

当胶合层压的木材受到弯矩时，它们通常在压缩区达到木材的抗压强度之前在拉伸区中以脆性方式破坏。这意味着没有充分利用木材的抗压强度。通过加强张力区域，可以将胶合层压木材的破坏模式从拉伸改变为压缩。结果，通过利用较高的抗压强度，增强的胶合层压木材变得更坚固，并且破坏模式变得具有压缩性和延性。本文介绍了在层压胶合木材的受拉区中钢筋对钢筋的影响的实验结果。在四点弯曲测试中，测试了四个被动加强梁，四个主动加强梁和七个未加强梁。实验结果证实了未加固梁的脆性拉伸破坏以及加固梁的延性和压缩破坏。此外，实验表明，相对于参考梁，被动和主动加固的胶合层压木材的强度（分别为26％和39％）和刚度（分别为30％和11％）有所增加。韧性从参考梁的7.7％分别提高到被动和主动加固的胶合层压木材的90％和75％。