Filip Anić

DEVELOPMENT OF A THREE-DIMENSIONAL COMPUTATIONAL MODEL FOR THE IN-PLANE AND OUT-OF-PLANE ANALYSIS OF MASONRY-INFILLED REINFORCED CONCRETE FRAMES

Structural frames, constructed either by steel or reinforced concrete (RC), are often infilled with masonry panels. In design, they are usually treated as non-structural elements, and their interaction with the bounding frame is often ignored. However, recent studies have demonstrated that infilled frame can be superior to a bare frame in terms of stiffness, strength and energy dissipation, when the structure is subjected to strong lateral loads including earthquakes. Today, several models have been developed to evaluate infilled structures. Nevertheless, such models have been validated with limited experimental data, and they have demonstrated different performances when compared with test results. This paper presents the development of a three-dimensional computational model based on the finite element method (FEM) that has been used to study the in-plane and out-of-plane behaviour of masonry infilled RC frames containing openings. Masonry infill walls were modelled as an assemblage of stiff yet deformable bricks while mortar joints as zero thickness interfaces. Initially, the material and interface parameters were determined by carrying out a series of small scale tests. The computational model was then used to predict the in-plane and out-of-plane behaviour of a series of full scale infill wall panels constructed in the laboratory using a similar brick and mortar combination. From the results analysis, it was shown that the FE model was capable of capturing the mode of failure and the load carrying capacity of the masonry-infilled RC frame with sufficient accuracy.

Clay block masonry and mortar joint interlocking

Ako se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sAko se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sljubnica nastupa prodiranje morta u supljine zidnog elementa. Otpornost pri posmiku određuje se na jednak nacin za ziđe od punih ili supljih opecnih zidnih elemenata te stoga utjecaj međusobnog spoja zidnih elemenata i sljubnica morta nije uzet u obzir. Pomocu prostornih nelinearnih proracunskih modela i usporedbom s odzivom fizikalnih modela provjeren je utjecaj međusobnog spoja supljih zidnih elemenata i sljubnica morta na posmicnu nosivost.

Three-dimensional micromodel of clay block masonry wall

In designing and implementing earthquake resistance for clay block masonry infill integrated into a structural frame, with or without openings, the infill wall should be taken into account. Presumably, simplified models, acceptable for practical use, could be applied for that purpose. However, the anisotropy of clay block masonry units, masonry mortar joints, and unit contact properties as well as the high variance of material properties limit their ability to describe the actual earthquake resistance of clay block masonry. In this work, we consider a three-dimensional micromodel of a clay block masonry wall, with the inclusion of masonry unit anisotropy and masonry mortar joint and unit contact properties. To avoid the excessive calibration procedure of the wall micromodel, the wall constituents were calibrated separately beforehand, which resulted in a high correlation of computational and experimental results without further need for calibration. Using a calibrated micromodel, the influence of variance in material properties on the walls resistance was investigated. The influence was showed not to be negligible, which may significantly affect the presumed behaviour of the whole structure.

Povezivanje u spoju mortom u ziđu od opečnih blokova

Ako se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sAko se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sljubnica nastupa prodiranje morta u supljine zidnog elementa. Otpornost pri posmiku određuje se na jednak nacin za ziđe od punih ili supljih opecnih zidnih elemenata te stoga utjecaj međusobnog spoja zidnih elemenata i sljubnica morta nije uzet u obzir. Pomocu prostornih nelinearnih proracunskih modela i usporedbom s odzivom fizikalnih modela provjeren je utjecaj međusobnog spoja supljih zidnih elemenata i sljubnica morta na posmicnu nosivost.

Šuplje ziđe od opeke i međusobni spoj sa sljubnicama morta

Ako se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sAko se pri izvedbi konstrukcijskog ziđa upotrebljevaju opecni zidni elementi s vertikalnim supljinama i mort opce namjene, tijekom ispunjavanja sljubnica nastupa prodiranje morta u supljine zidnog elementa. Otpornost pri posmiku određuje se na jednak nacin za ziđe od punih ili supljih opecnih zidnih elemenata te stoga utjecaj međusobnog spoja zidnih elemenata i sljubnica morta nije uzet u obzir. Pomocu prostornih nelinearnih proracunskih modela i usporedbom s odzivom fizikalnih modela provjeren je utjecaj međusobnog spoja supljih zidnih elemenata i sljubnica morta na posmicnu nosivost.

STRESS OF ANGLE SECTION SUBJECTED TO TRANSVERSAL LOADING ACTING OUT OF THE SHEAR CENTER

Angle or L-section bars are commonly used as non-structural elements in modern buildings, such as carriers of massive and expensive glass walls. While