Response Modification Factors for Reinforced Concrete Liquid Containing Structures

Abstract eng:
Reinforced concrete liquid storage tanks have been extensively used as a part of environmental engineering facilities. Since functionality of these structures after an earthquake is very important to meet the emergency state requirements, seismic damage of these structures is of main concern. One of the main parameters used in the seismic design of structures is the “Response Modification Factor” (R). The values of “R” for different structural systems and materials for buildings are well defined and included in the building Codes. For liquid containing structures (LCS), there has not been a justifiable guideline for determination of the “R” and the empirical values have been implemented in the design of such structures. While the seismic design criteria for the buildings are mainly based on life safety and prevention of collapse, the concrete storage tanks should be designed to meet the serviceability limits such as leakage. In this paper the mechanism of leakage in RC tanks is discussed. The response modification factor for LCS along with the corresponding experimental tests will also be discussed. It is concluded that the use of period independent R factor for the LCS may not be appropriate. The current values of R might need to be adjusted as no leakage was observed prior to the yielding of the wall reinforcement.

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