Analytical investigation of reinforced concrete frames under middle column removal scenario

Abstract

A simplified theoretical model is developed in the present study in order to predict the general behavior and resistance of reinforced concrete frames under column removal scenarios. The proposed model defines the load-deflection response of the middle joint above the removed column based on a four-stage procedure: classical beam mechanism stage, arching stage, transient stage, and catenary stage. A comprehensive evaluation study using two validation approaches is performed in order to investigate the reliability of the introduced model. For validation of theoretical model, the results of a comprehensive finite element method and experimental data were utilized and the results were compared with the theoretical model. The results demonstrated that the proposed theoretical procedure can establish a reliable foundation for progressive collapse assessment of reinforced concrete frame structures. The proposed model can also predict behavior of symmetrical frames, and this was validated by good agreement between finite element results and the results of the proposed numerical model.

Evaluation of RC Elements Under High-Temperature Conditions with different Locations: Analytical Investigation

“…The response of load de ection was studied for the middle joint with a procedure that includes four stages that include arching, mechanism, catenary and transient stages. This model has the ability to response of the frames that are symmetrical [11]. The development of the structure with the nite element model was done with RC structural frame as the basis.…”

Experimental Assessment of Progressive Collapse of Reinforced Concrete Beam-Column Assemblages

“…In order to ensure further verification of the beam-column assemblage experimental results, the results were evaluated using some existing models. The peak compression arch action capacity has been evaluated by Park [19] and Mohajeri [20] models. Table 5 outlines the calculated ratios of the experimental arching capacity Pu exp.…”

Experimental and Numerical Investigation of a Method for Strengthening Cold-Formed Steel Profiles in Bending

“…For a decisive simulation, two types of interactions were defined for the FE models of the uprights subjected to loading either about the major axis or the minor axis: (a) the existing interaction of flange edges and bracing, and (b) the interaction of bracing webs at bolt connections. The surface to surface interaction with hard contact for normal behaviour, as well as the penalty method with the friction coefficient of 0.3 for the tangential behaviour, were adopted for the model interactions [41][42][43][44]. The coupling method and beam connectors were also used to model the bolts.…”

“…Figure 24 indicates the existing interactions between frame elements as well as the modelling of the bolt in the upright frame. to surface interaction with hard contact for normal behaviour, as well as the penalty method with the friction coefficient of 0.3 for the tangential behaviour, were adopted for the model interactions [41][42][43][44]. The coupling method and beam connectors were also used to model the bolts.…”