Abstract : This study describes an open access approach that use a fiber-based model to simulate the gradual collapse of reinforced concrete (RC) structures exposed to blast loading in an urban setting, resulting in the loss of one or more bearing parts. In this context, member removal indicates an occurrence that occurs when harsh conditions or abnormal loads kill the member itself. Three independent numerical tools were used to generate and compare two- and three-dimensional models of frame structures: an open source software called OpenSees and two commercial programmes called SeismoStruct and Ls-Dyna. The first two are more traditional fiber-based software, but the third is a well-known general purpose finite element (FE) product. The removal of crucial components is considered to occur in the building under decade, consideration, and a specific purpose procedure inside OpenSees and SeismoStruct has been built to produce a fibre model capable of modelling overall structural reaction owing to their failure. In this computational method, one or more vertical ed safety against excessive collapse of important parts. Sacrificial components and members are removed from the model instantly, and the building's capacity to effectively absorb. Recent instances shown that structures erected in accordance with conventional norms are not always capable of withstanding man-made severe events such as collision or explosions. Non-structural preventive measures such as barriers have previously boost public access limiting or control. In the previous member loss is studied. The acquired findings were evaluated and confirmed using the transient dynamic software Ls-Dyna. This study's numerical and modelling findings on the progressive collapse behaviour of RC structures may be instantly used to the design, vulnerability assessment, FE and strengthening of various structural typologies ranging from residential frames to strategic and military institutions.