Analysis Of Masonry Buildings Research Articles

Simplified frame model for capacity assessment of masonry buildings

Masonry buildings comprise a major fraction of the total buildings globally. Analysis of masonry buildings is challenging due to underlying uncertainties in material properties, variation in construction system, workmanship discrepancies, and analysis schemes. At present, several finite element approaches are available for masonry modeling; however, most of such methods are sophisticated as they require huge computational efforts, time, and realistic allocation of material properties. Thus, there is a need for a simple yet representative method to capture the complex behavior of masonry buildings. To this end, we propose a displacement-based Simplified Frame Model (SFM) to analyze masonry structures. Details of the methodology including the analysis results are presented in this paper. Nonlinear static pushover analysis is adopted for finite element modeling of the prototype building. A comparison between the analytical and experimental results highlights that the SFM can be effectively used for masonry analysis assuring less computational efforts.

Nonlinear Analysis of Masonry Buildings Under Seismic Actions with a Multifan Finite Element

This paper presented an innovative method for nonlinear simulation of masonry structures under seismic loading conditions. The method is based on a macro-modeling formulation of a masonry panel. A new finite element (FE), called a “multi-fan” (MF) element, is developed on the macro scale, whereby the stress field within the panel is determined at each load step by minimizing the current complementary potential energy. Because only one element is required to model a single masonry panel in the structure, this approach enables a reduction in the total number of degrees of freedom (DOFs) of the system and the total computational effort. The ability of the proposed approach to estimate the ultimate capacity of masonry walls was analyzed both by comparing its predictions with available experimental results and through FE analyses based on a micro-modeling approach. The comparisons show satisfactory accuracy at both the global and local levels. Therefore, the new macro-element can be effectively used in safety assessments of masonry buildings.

Elastoplastic Seismic Response Analysis of Masonry Buildings with Variable Wall Thickness along Height

The multistory masonry buildings with variable wall thickness along the height have suffered different degrees of damage subjected to the Wenchuan earthquake. In order to study the failure mechanism of such masonry structure under the earthquake, three types of five-story structure of computational model are firstly introduced in this paper, including (1) the wall thickness of five stories is 240mm; (2) the wall thickness of the first floor is 370mm, and that of the upper four stories is 240mm; (3) the wall thickness of the first and second story is 370mm, and that of the other stories is 240mm. Then, the elastoplastic time-history dynamic analysis is carried on with the story shear model by the finite element method, and the ground motion of El Centro waves are adopted as earthquake input motion. The analysis results show that variation of wall thickness along height can easily cause stiffness mutation of the upper and lower floor, lead to local floor deformation concentration and soft floors, and the change of failure mechanism of the structure. Finally, it is suggested that some appropriate seismic resistance measures should be taken to meet the lateral stiffness ratio of the upper and lower floor in the later design of this structure, or this kind of structure should be avoided using as far as possible.

Cracks in masonry. A procedures for evaluation

Traditionally the masonry structures, are evaluate to start from its original geometry, without to rely on, sometimes, with precious listings, starting to the ideals models. Recently, on the checking, that the nature of these structures not permit a elastic analysis, since as it constitution hyperestatique is high, and that the knowledge of the deformed geometry of these structures is basic, to can establish conjectures about his working, well through of methods to based in plastics theories, elastics (numerical methods), combinations of both o simply for applications of graphics methods. The present paper, on propose in the summarize form show, theses differences in the form to approach the analysis of masonry buildings, to star of removed geometry for the cracks, phenomenon of the obligate apparition in all masonry structure that they are working.

Non-linear Dynamic Analysis For ExistingMasonry Structures According To Eurocode 8

In this paper a simplified method for non-linear dynamic analysis of masonry buildings with rigid floor diaphragms is proposed, considering the vertical and in-plane response of the walls. The relevant feature of the method resides in a unique-kind of macro-element, suitable to modelling the mechanical behaviour of the building plain masonry walls. The analysis will be conducted by a direct numerical step-by-step integration of its differential equations of motion, (treated beforehand to reduce in number and to uncouple these equations). The results of the analysis are : i) the time history of floor displacements under an arbitrarily prescribed direction of the resulting horizontal seismic action evaluated according to the Eurocode 8 provisions as well as under the current vertical forces; ii) the seismic resistance of the building.