ABSTRACT

The article focuses on the oldest surviving I-type portico houses located in the Vistula Delta, which were built in the 17th and 18th centuries. The study describes the houses’ origins, structure, details of roof structures and technical condition, and it also includes numerical modelling of a roof truss and its mechanical analysis. Numerical models of the roof trusses are defined and analysed by means of the finite element method. Global sensitivity analysis with the use of the polynomial chaos expansion method is used to study the influence of uncertainties in material properties of wood, such as Young’s modulus and the friction coefficient, and also the beam cross-sectional height in the output of the numerical model of the structure. The outcomes show that the uncertainty of beam height exerts the dominating influence on the maximum deflection of the roof truss, hence accurate measurements of geometry are of great importance in the planning of conservation and renovation of such historic structures.

摘要

文章重点介绍了位于维斯瓦河三角洲的现存最古老的 I 型门廊房屋，建于 17 和 18 世纪。该研究描述了房屋的起源、结构、屋顶结构的细节和技术条件，还包括屋顶桁架的数值建模及其力学分析。通过有限元方法定义和分析了屋架的数值模型。使用多项式混沌展开法进行全局灵敏度分析，研究不确定性对木材材料特性的影响，如杨氏模量和摩擦系数，以及数值模型输出中的梁截面高度的结构。