Issue 47

A. Namdar et alii, Frattura ed Integrità Strutturale, 47 (2019) 451-458; DOI: 10.3221/IGF-ESIS.47.35 455 z w z     (7) yz w v y z        (8) zx u w z x        (9) xy v u x y        (10) In the present study, the above theoretical concept has been applied in numerical analysis, and the strain-displacement cyclic behavior of timber beam has been graphically shown, in order to understand timber beam seismic response. N UMERICAL ANALYSIS AND DISCUSSION he numerical analysis results show that the timber-frame resists well against seismic loading. In comparative analysis of two types of timber frames, the safety and the economy concepts are demonstrated. With higher span of timber frame, the bending moment on controls the beam seismic response, while in smaller span of timber frame the shear force is controlled seismic behavior of the beam. This phenomenon causes a nonlinear deformation of the beam. The same stiffness of timber cross section in both models, will induce larger displacements in beam with the longer length. Seismic response of both models illustrated that, for finite elastic strains, the timber beam involves large displacements and strains. Load-displacement in the cycling direction is obtained from numerical analysis, using ABAQUS software [Figs. 5-6]. In comparison models 1 and 2, the loading, unloading and reloading cycles, show different shape for each model. This is also reflected to displacement of beam. It is observed that increasing the distribution level of seismic load in timber beam, model 1, shows a significantly effect on the change displacements mechanism. Figure 5 : Load Vs displacement on timber beam with 3.3 (m) length, model-1. Figure 6 : Load Vs displacement on timber beam with 1.8 (m) length, model-2. The magnitude of a nonlinear deformation of timber beam during an individual earthquake, occurs both on the basis of the beam length and in the maximum displacement. Although there are significantly differences between developing cycling graphs of load-displacement in each models, which are produced on timber frame seismic load response. In T