Issue 47

A. Namdar et alii, Frattura ed Integrità Strutturale, 47 (2019) 451-458; DOI: 10.3221/IGF-ESIS.47.35 457 Figure 9 : Load Vs strain on timber beam with 3.3 (m) length, model-1. Figure 10 : Load Vs strain on timber beam with 1.8 (m) length, model-2. C ONCLUSION he timber beam seismic resistance correlated to displacement and nonlinear strain, has been investigated. The timber frame model performance is represented by seismic load-displacement, and by seismic load-strain. The load-displacement diagram relationship is subjected in considerable research in timber frame. The small displacement theory concept has been applied in numerical analysis, and the strain-displacement cyclic behavior of timber beam has been investigated, in order to understand the timber beam seismic response. In this work the follows goals have been achieved:  From the load-displacement diagram analysis it has been found that, for the same stiffness in timber cross section in both models, it will induce larger displacements in beams characterized by longer length.  The inertia is not negligible in a timber frame during subjected to seismic loading. It produces base shear, moment and torsional excitation which cause hysteretic displacement of timber beam.  The deformation of beam significantly influences the model behavior, especially with respect to damping, inertial interaction and energy dissipation.  The energy dissipation causes nonlinear deformation and the displacement. In load-strain mechanism, only the part of the strain energy, corresponding to the linear elastic response, is recovered.  A flexible 3.3 m timber beam reaches the failure displacement with lower elastic strain energy.  The percentage of the seismic load supported by beams and columns is affected by flexibility of frame. R EFERENCES [1] Namdar, A., Darvishi, E., Feng, X. and Ge, Q. (2016). Seismic resistance of timber structure - a state of the art design. Procedia Structural Integrity, 2, pp. 2750-2756. DOI:10.1016/j.prostr.2016.06.343. [2] Lokaj, A. and Klajmonová, K. (2017). Comparison of behaviour of laterally loaded round and squared timber bolted joints. Frattura ed Integrità Strutturale, 11 (39), pp. 2750-2756. DOI: 10.3221/IGF-ESIS.39.07. [3] Haiyan, T. (2016). Damage of bamboo and wooden materials based on linear elastic fracture mechanics in garden design. Frattura ed Integrità Strutturale, 10(35), pp. 472-480. DOI: 10.3221/IGF-ESIS.35.53. [4] Santos, C.L. dos., Morais, J.J.L and Jesus, A.M.P. de. (2015). Mechanical behaviour of wood T-joints. Experimental and numerical investigation. Frattura ed Integrità Strutturale, 9(31), pp. 23-37. DOI: 10.3221/IGF-ESIS.31.03. [5] Jingran, G., Jian, L., Jian, Q and Menglin, G. (2014). Degradation assessment of waterlogged wood at Haimenkou site. Frattura ed Integrità Strutturale, 8(30), pp. 495-501. DOI: 10.3221/IGF-ESIS.30.60. [6] Drbe, OF., El Naggar, MH. (2014). Axial monotonic and cyclic compression behaviour of hollow-bar micropiles. Can Geotech J, 52(4), pp. 426-41. DOI: 10.1139/cgj-2014-0052. T