Performance-based seismic assessment of a large concrete framed structure supporting multi-units of heavy compressors

Abstract

In a liquefied nature gas (LNG) plant, a large concrete framed structure supporting multi-units of heavy compressors was designed in accordance with ACI 318-08 code requirements and ASCE 7-05seismic loads. When applied to new structures, provisions of ACI 318 are intended to provide Life Safety (LS) performance for the Design Basis Earthquake (DBE). Due to the important function of the compressors, this study will perform a seismic assessment of the Table Top Pedestal to assure adequate capacity of preventing collapse from Maximum Considered Earthquake (MCE) and only having limited structural damage under a moderate (MOD) 20%@50 years earthquake event. In this study, the Linear Dynamic Procedure (LDP) of ASCE 41-13 is used for the seismic performance evaluation of the table top structure. The structural modeling parameters and acceptance criteria of structural performances are based on Chapter 10 of ASCE 41-13. Soil-structural interaction and P-Delta effects are considered in the analysis process. The response spectra of the three levels of seismic hazards of DBE, MCE and MOD earthquake were developed for response spectra analysis. The procedures presented in this study can be used as a general guideline for Performance-Based Design of most reinforced concrete structures located in industrial plants.