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.
Highlights
In a liquefied nature gas (LNG) plant, it requires multiple compressor units of methane, ethylene and propane compressors in order to convert natural gas to LNG by cooling the liquid temperature to –270 °F
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) earthquake event of 20%@50 years
The Linear Dynamic Procedure (LDP) is a practical and efficient approach for seismic performance based retrofitting of existing structures and is recommended to be used for analysis of new structures in the industrial plants
Summary
In a liquefied nature gas (LNG) plant, it requires multiple compressor units of methane, ethylene and propane compressors in order to convert natural gas to LNG by cooling the liquid temperature to –270 °F. A typical concrete framed structure ( referred to as Table Top |Pedestal) supporting two trains of methane compressors as shown in Fig. 1 has been designed by Jan [1] in accordance with ACI 318-08[2] and ASCE 7-05 [3] code requirements. 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 MCE and only having limited structural damage under a moderate (MOD) earthquake event of 20%@50 years (a return period of 225 years). NDP requires considerable efforts in mathematic modelling and tedious analysis process and interpretation of analysis results An industrial structure such as the table top pedestal has little irregularity in the structure layout in general, the linear dynamic procedure is appropriate to be used for seismic performance evaluation of the structure. The LDP is a practical and efficient approach for seismic performance based retrofitting of existing structures and is recommended to be used for analysis of new structures in the industrial plants
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