Numerical and analytical assessment of the buckling behaviour of Blockhaus log-walls under in-plane compression

Non-linear modelling of the in-plane seismic behaviour of timber Blockhaus log-walls

“…4b and c). Although these small profiles can offer increased bending stiffness of the studied log-walls against out-of-plane deflections, as recently demonstrated in [14,15], they are not rigidly connected to the adjacent timber logs. As a result, their structural efficiency in presence of in-plane lateral loads is almost null.…”

Numerical Investigation of Timber Log‐Haus Walls with Steel Dovetail Reinforcements under In‐Plane Seismic Loads

“…In this sense, the availability of additional small-scale experiments on similar specimens could certainly offer further validation to the Advances in Civil Engineeringactual FE assumptions. In any case, despite the limited number of test results, from the current comparisons, it is already possible to appreciate the validity of numerical modelling features derived from past investigations on the same structural typology (i.e., [16,28]). …”

“…Based on the nominal geometry of the examined assembly components, as well as on past studies (i.e., [16,28]) and small-scale specimen analyses (see Section 3), mesh size and pattern were properly optimized at a preliminary stage of the numerical investigation so as to maximize the eciency of FE simulations and to preserve the accuracy of predictions (i.e., evolution and distribution of stress peaks), with careful consideration especially for the regions of contact between logs and dovetails, as well as within the carpentry joints (see Figure 8(c)). e typical model hence consisted of 22,000 solid elements, with 100,000 DOFs.…”

Numerical Investigation of the in-Plane Seismic Performance of Timber Log-Haus Walls With Reinforced Dovetails

“…Due to the loading condition of timber logs, a mean average modulus of elasticity (MOE) in the direction parallel to grain E||= 11556MPa (11000MPa the mean nominal value recommended by [11]) and a shear modulus G = 617MPa (690MPa the mean nominal value [11]) were taken into account, as experimentally derived in [14]. Possible failure mechanisms in the same logs were also accounted, in the form of a simplified Von Mises plastic law.…”

“…To this aim, yielding stress was defined by considering the occurrence of possible crushing mechanisms in logs, as expected especially for the portions of logs subjected to contact with the steel reinforcement. Following [14], the mean value of compressive stress in the direction parallel to grain was hence assumed, being experimentally calculated for the same timber logs in the value of 33.59MPa (mean value given in [11] equal to ≈ fc,0,k/0.7= 30MPa).…”