Engineering Failure Case Study

Failure epitome at DMRC On July 12th 2009 a metro bridge that was on a lower floor construction collapsed due to negligence by an office in- missionary post of the Badarpur Metro line. The sorrow of the bridge killed 6 and injured another 15 when the docking facility tipital sheared from the connecting pillars. The Delhi Metro Rail Corporation took major heat from this calamity because the road was a major milestone of providing a reliable and palmy mean of transportation to the capitol of India.The DMRC is considered the most reputed infrastructure organization of India and neglecting roadways to the point where they give is not an option. During that day the bobtail cap collapsed causing the collapse of the entree girder, span amid p-66 and p-67 piers which had already been erected and pre-stressed, and besides segments of the superstructure for the span between p-67 and p-68. The pier cap (p-67) sheared from the connecting point of the pier and pier cap.The top bac king of the cantilever beam did not have any development into the pier itself which caused the shear itself. The debut girder has failed due to the failure of the pier cap. This failure also caused the span between piers 67 and 68 causing it to be run harbored by the ground on one end and the pier cap on the other. With the failure of the pier cap and span between piers the stretch out used for lifting the launching girder also failed on July 13th 2009.Bending of the extend shows the clear sign of overloading which was caused by not analyzing the total of stress the unfold could handle. The causes of the failure are many and once one portion of the roadway failed it caused a chain reaction to the entire infrastructure collapsing. The pier (p-67) was initially designed as a leg of a portal enclose between piers but then was changed to support the pier cap. The same rule was used for piers p-66 and p-68.The top accompaniment was poorly engineered the pier cap had a reinforce ment of 36mm diameter and a space of 500mm which was an insufficient bond length for the structure. During the launching operation the launching girder itself developed a crack that was grouted in crack areas and further strengthened by introducing prop or jacketing. During the launching of superstructure 6 segments where lifted and the whole system collapsed when the seventh segment was hooklike up for lifting.It was concluded that the failure of the pier cap occurred to the improper jacketing through with(p) when a crack had occurred. This was also coupled with inadequate length of support and reinforcement of the cantilever pier cap. The failure of the cranes was the fact that the capacity of 2 cranes where not able to hold the weight of the superstructure which caused the larger 3rd crane to fail. The Delhi Metro Rail Corporation sacked the official in charge of the Badarpur Metro line, Vijay Anand for neglecting his duty.Structural designs should have been proof chequered b y an experienced structural engineer. Also once failure had been observed the structure should have been given up and a new structure should have been built. Make shift reinforcement to save a failed structure was a major neglecting get it on and engineer failure. The lack of professionalism that lead to the superstructure failure started with trying to fix the failed pier cap and neglecting the fact that the cranes used to lift the structure where not engineered to hold the amount of weight that needed to be supported.The support reinforcement should have been checked by an experienced engineer that should have easily seen the reinforcement issue between the pier and pier cap. The information for this case study was fix from www. engineeringcivil. com/theory/civil. engineering-disaster. com and www. thaindian. com. The entire structural failure was found on these sites including who was a fault and why the structure failed.