A Comparative Study of a Piping System Subjected to Earthquake Loads Using Finite Element Modeling and Analysis

This paper discusses the accuracy of a finite element model of a coupled piping system subjected to earthquake loads, as well as the differences in seismic behavior between coupled and welded piping system models. The test setup of a Victaulic coupled piping system tested at Lehigh University was modeled and analyzed with finite element methods. Two models were developed: (1) a welded pipe model, in which pipe connections were rigid, and (2) a coupled pipe model, in which couplings were modeled using the rotational stiffness characteristics of Victaulic couplings determined with static tests. The results of the coupled pipe model were compared to the laboratory data to determine the accuracy of the model in predicting real seismic behavior. Additionally, the results of the coupled and welded pipe models were compared to determine the differences in seismic behavior between the two systems. The introduction of this paper includes an overview of earthquake resistance in pipes, the Victaulic project, and basics of finite element analysis. This is followed by a discussion of the procedures carried out, including coupling tests and finite element modeling and analysis. Finally, this paper discusses the results and conclusions drawn and their significance.