• Vikas Tiwari
• Dr. V.P. Singh
• Dr. J. P. Dwivedi

Earthquake is the most dangerous natural catastrophe among all natural calamities. Earthquakes have always been a serious threat to humanity, which always results in a serious loss of life and property. According to a survey our civilization is facing earthquake in almost every month. Thus it is the prime objective of scientists and engineers to study and analysis the earthquake motion and to find methods to reduce damaging effects of earthquake on different kinds of structure. In the past, large numbers of papers have been published which deal with the development of design criterion for structures to make them earthquake resistant. But these efforts have been concentrated mainly on the structures built above the ground. A major class of structural systems namely the lifelines did not draw attention of researchers till seventies. Lifelines (pipelines) have been included in the list of earthquake affected structures only recently when some heavy damages were reported. Therefore, the earthquake effects on buried pipelines are an important problem to deal with. All the previous works done on the dynamic response of underground pipelines were mainly related to the assessment of the effect of different soil parameters of the continuum. Some researchers made an attempt to find the deformation in buried pipelines due to seismic action. It is still an important area of the research to find out the behavior of stresses that induced in the shell during earthquake/ seismic excitation. Again no further steps were taken to investigate the stress in the fluid filled pipelines by treating it as thick cylindrical shell. An attempt has been made here to study the axisymmetric stresses (axial and hoop) induced in the shell. The shell has been modelled as an infinitely long circular cylindrical shell made of orthotropic material imperfectly bonded in a homogeneous, isotropic and elastic medium of infinite extent. A thick shell theory has been used whereas the effect of rotary inertia is neglected. The seismic excitation is considered in the form of secondary wave/ shear wave. It is assumed that the shell-soil is bonded together by a thin, elastic and inertialess bond. Results have been shown in this thesis for different degrees of bond imperfection by varying the bond parameters. Also, different soil conditions around the shell and different angle of wave incidence have been considered for the empty shell along with the fluid filled shell. The effect of fluid inside the shell has also been studied; it is found that fluid has a significant effect on the stresses induced in the thick shell.

EFFECT OF BOND IMPERFECTION ON THE STRESSES INDUCED IN BURIED THICK ORTHOTROPIC CYLINDRICAL FLUID FILLED SHELL DUE TO SHEAR WAVE

"EFFECT OF BOND IMPERFECTION ON THE STRESSES INDUCED IN BURIED THICK ORTHOTROPIC CYLINDRICAL FLUID FILLED SHELL DUE TO SHEAR WAVE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 6, page no.64-69, June 2019, Available :http://www.jetir.org/papers/JETIRCT06012.pdf

"EFFECT OF BOND IMPERFECTION ON THE STRESSES INDUCED IN BURIED THICK ORTHOTROPIC CYLINDRICAL FLUID FILLED SHELL DUE TO SHEAR WAVE", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 6, page no. pp64-69, June 2019, Available at : http://www.jetir.org/papers/JETIRCT06012.pdf