Reliability Analysis Of Steel Beam Under Uncertain Blast Loads

The blast load acting on the building structures has high uncertainty for that it iseasily influenced by many factors such as the type and shape of the explosives, thelocation of the detonation point, the complex urban environment and theenvironmental temperature and humidity; the static and dynamic properties of thematerial; and the size of the structure members of the building structures are alsouncertain in nature. Therefore, to get the credible results of structural memberreliability analysis, it is necessary to introduce the uncertainty of the blast load, thestructure material properties and the structure dimensions into the failure analysis ofstructure members under blast load. Based on the challenges of reliability analysis forbuilding structures under blast loading, this paper mainly include:(1) Firstly introduce blast loading acting on the building structure and itssimplified model and then the statistical models of the blast load acting on thebuilding structure are established through the statistical analysis of the empiricalformula and the calculation form established by the predecessors based on the blastload tests, and the recent blast load test data.(2) Using the statistical models as the input load, selecting two typical steelbeams, taking account of the uncertainty of the size of the steel beam and the materialstrength, and based on the Single-Degree-of-Freedom (SDOF) system theory andMonte Caro simulation method, we develop an utility procedure for reliabilityanalysis of the steel beam under blast loading, on which the failure probability-scaleddistance curve for the steel beam under blast loading is obtained.(3) Based on the former step, the mass of the explosives, the scaled distance, thesectional dimensions, the uncertainty of the blast loading and structural properties arefurther studied to investigate their influence on the failure probability of the steelbeam. This research show that: the uncertainty of the blast loading has an importantinfluence for the failure probability-scaled distance curve of the steel beam.The results of this article can provide technical support for the policy-makers orstructure designers on the blast-resistant design of the structure members.