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Seismic evaluation by deriving the vulnerable structure of the water pipeline

Seismic evaluation by deriving the vulnerable structure of the water pipeline
Alternative Author(s)
김종오 교수님
Issue Date
2021. 2
Earthquake occurrence increases rapidly in 21st century throughout the world and damages the civil structure along with taking lives of the people. Along with the damage of buildings and other facility, earthquakes severely affect the water supply system in term of breakage and leakage. The evaluation and identification of vulnerable points that were responsible for the compromising water supply network due to seismic activity were the objective of this study. However, the seismic resistance studies of existing domestic water supply facilities are being conducted based on the seismic resistance standards presented in the' Water and Sewerage Facility Standards', but quantitative standards and standard test methods for seismic performance evaluation of water pipelines have not been discussed. As it is not quantified, it is necessary to develop standards and test methods for evaluating the seismic performance of water pipelines. Moreover, the standards used or developed in literature (overseas) and in Korea for water and sewerage system were used for the directly investigating the damage type and damage points in this study, by considering the damage to the water supply network of domestic seismic activities. In the case of seismic evaluation, a four-point bending test and a two-point shaking test were conducted. Impact of ground subsidence due to ground liquefaction in the event of an earthquake was evaluated through the four-point bending test, this was to confirm the limit of bending deformation of the joint, which was selected as a vulnerable structure. In the case of the two-point shaking test, it was conducted based on the Cyclic testing loading protocol, because there is no cyclic load test regulation for non-structural materials such as pipes in Korea, so it follows the standards of the US FEMA. The cyclic loading test is a method that can evaluate the elastic behavior as well as the maximum cyclic load that can lead to failure of the target specimen. It was to evaluate the seismic performance of the pipe installed on the ground and the pipe buried in the shallow ground around the main building when an earthquake occurs. Result elucidated that metallic pipes shows the less deformation (maximum angle of deformation = 18.9° (F_M_K_01)) as compare to the non-metal pipes (maximum angle of deformation = 38.4° (F_N_SR1_03)) in four-point bending test. However, by showing less deformation metallic pipe shows the more leakages at the joints as compare to the non-metallic pipes. Moreover, it also shows that DCIP pipes with collar connections were the weakest combination in this test however, due to non-metallic pipes shows the no leakages in design test conditions due to the limitation equipment facility for four-point bending test. In two-point shaking test the cyclic loading results confirms the combination of the pipes with expansion joints (T_M_S_08, T_M_C_09) shows less vulnerability to the experiment conditions. Interestingly the unexpected leakages were observed in flange pipes at the welding point of the pipes, so it is suggested to used flange pipes made of cast casting as similar to US. The results concluded that the joints in the pipes were the most vulnerable part of the system that’s were affected by the seismic activity and to overcome this we need to provide the suitable design standard to developed the joints that supplements the existing standards. Along with that this study outcome shows that the Seismic evaluation is carried out by reproducing the vulnerable structure derived from the water supply network/water supply pipeline. Through this, the bending limit, damage type, and deformation type of the pipe were checked. Thus, the water supply network/water supply pipeline design will be provided with complementary elements for seismic design and will be used as data that can be quantified and weighted during the design. It will be the content of research that helps the quantitative standard of seismic design and seismic evaluation.
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