Reinforced concrete frames with masonry infill are widely utilized in construction worldwide. This present study aimed to investigate the behaviour of masonry infill. Firstly, the compressive strength of the masonry infill and the evaluation methods were examined, specifically prism tests and wallette tests. The study collected a substantial database, revealing that wallette tests indicate higher stiffness compared to prism tests. Based on the findings, it is recommended to employ prism tests for assessing the stiffness of masonry and wallette tests for evaluating the compressive strength of masonry. Furthermore, the study assessed the performance of 18 empirical models to identify the most suitable model for predicting the compressive strength of masonry using the two testing methods (wallette and prism). To evaluate the strength of masonry infills under horizontal loading, a database of reinforced concrete frames with masonry infills was collected. The infill responses were determined by calculating the differences between the infilled frame and the bare frame. By employing multivariate regression analysis, equations were proposed for the various parameters of the quadri-linear relationship governing the behaviour of masonry infill. A comparison of the equations proposed in this present study with those present in the literature demonstrated their reliability.
Purpose The purpose of this study, is to deals with capacity design (strong column – weak beam) in reinforced concrete frames, slightly slender, which depends on the determination of a capacity ratio necessary to reach a structural plastic mechanism. To find the capacity ratio allowing to achieve a fairly ductile behavior in reinforced concrete frames, it is necessary to validate this concept by a non-linear static analysis (push-over). However, this analysis is carried out by the use of the ETABS software, and by the introduction into the beams and columns of plastic hinges according to FEMA-356 code. Design/methodology/approach This approach makes it possible to assess seismic performance, which facilitates the establishment of a system for detecting the plasticization mechanisms of structures. It is also necessary to use a probabilistic method allowing to treat the dimensioning by the identification of the most probable mechanisms and to take only those that contribute the most to the probability of global failure of the structural system. Findings In this study, three reinforced concrete frame buildings with different numbers of floors were analyzed by varying the capacity ratio of the elements. The results obtained indicate that it is strongly recommended to increase the ratio of the resistant moments of the columns on those of the beams for the Algerian seismic regulation (RPA code), knowing that the frameworks in reinforced concrete are widespread in the country. Originality/value The main interest of this paper is to criticize the resistance condition required by RPA code, which must be the subject of particular attention to reach a mechanism of favorable collapse. This study recommends, on the basis of a reliability analysis, the use of a capacity dimensioning ratio greater than or equal to two, making it possible to have a sufficiently low probability of failure to ensure a level of security for users.
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