banner.jpg 379 Blast Simulation on Laced Steel-Concrete Composite Beam A. Thirumalaiselvi1,2,a, N. Anandavalli1,2, J. Rajasankar2 and Nagesh R.Iyer2 1Academy of Scientific and Innovative Research Centre, CSIR Campus, CSIR Road, Taramani (P.O), Chennai, 600113, India. aselvi@serc.res.in 2CSIR-Structural Engineering Research Centre,CSIR Campus, CSIR Road, Taramani (P.O),
Chennai, 600113, India. ABSTRACT

Laced Steel-Concrete Composite (LSCC) beams with varying cover plate thickness subjected to blast loads have been analyzed using different techniques: an equivalent single degree of freedom (SDOF) model using the DUHAMEL integration technique and NEWMARK-BETA method, and multiple degree of freedom (MDOF) model using finite element analysis. LSCC beam is idealised as simply supported beam using equivalent steel beam approach. Triangular blast pressure distribution is adopted in the study. Comparison of natural frequency values obtained by SDOF and MDOF analysis shows that adopting equivalent steel beam parameters in SDOF system is not appropriate. Maximum response obtained using SDOF analysis is found to be over conservative for LSCC beam having plate thicknesses greater than 3mm.

Keywords: Duhamel integral, Blast, Newmark-Beta method, Finite element analysis.

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