International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 10 Issue: 04 | Apr 2023
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p-ISSN: 2395-0072
Inelastic seismic response of single-story structure in hilly areas owing to ground excitation: Mitigating by vibration control device TLD Krishnendu Chowdhury1, Utsha Chowdhury2, Goutam Bairagi3 1,2Assistant Professor, Civil Engineering Department, K K College of Engineering & Management, Jharkhand, India 3Professor & Head, Civil Engineering Department, Jalpaiguri Govt. Engineering College, West Bengal, India
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Abstract – This study examines the inelastic seismic response of an idealized single-story RC structural system in hilly region
under sloppy ground subjected to bi-directional ground motion excitation. In this exertion, models have various degree of inelasticity, are subjected to a set of near-fault ground motion with different characteristics for both symmetric and asymmetric structural systems. The columns are varying height owing to sloping ground conducted different angle of slopes like 15°, 25°, 35° and 45° on symmetric and asymmetric system for evaluating the overall response of load resisting elements and their mitigation techniques due to uncontrolled vibration and heavy weight land slide using beam-column joint and also modern technique of tuned liquid damper (TLD). The broad conclusions present in this study helps the fine tune of the provisions in the seismic code. Key Words: Inelastic response, Seismic response, Sloppy ground, Bi-directional, Angle of slopes, Beam-column joint, TLD.
1. INTRODUCTION The deficiency of RC building in hilly areas can be observed a major serious challenging issue through out the globe. The seismic performance of buildings depends on shapes and plan of structural elements. In that case, at hilly area structures are constructed based on ground orientation make the structures irregular with vertical and horizontal setback. Generally, ground motion behaves like a vector formation that is N-S and E-W direction. This bi-directional excitation created the vulnerability of structures for both configurations majorly that the eye-witness Nepal 2015, Sikkim 2011, Kashmir 2005 etc. were already recorded. The position of columns on sloppy ground terrains fabricates an irregular weak supporting frame work that induce a torsional effect in an inelastic region of load resisting structural elements owing to ground motion. Also, soil of the hills and mountains are those to be found in areas with altitude minimum above 300m sea level and slope 15% and above. This serious condition makes unease for developing the foundation strong for ages. Need some new observations will be made on keeping in mind that overall particular matter so the seismic safety mitigation techniques solve the problems and also favor the code provision more updated. Asymmetric structures are more vulnerable than the symmetric counterparts due to lateral and torsional coupling at different stiffness and mass eccentric conditions. Several earthquake phenomena indicate the elemental deformation causes due to low quality materials used and the proper designing program of structural construction with respect to the plan orientation in hilly region. Some exemplar shows in Fig. 1-3 that makes a serious matter in human life. The limited work done has been conducted on this particular aspect for single-story model structure. Researchers have been proposed that the effect due to bi-directional excitation in hilly region buildings, clearly conclude that the primary failure mode is created by shear failure of short columns as a result lower seismic capacity of structural system in sloppy ground [1]. Furthermore, another serious observation on RC frame buildings in hilly slopes clearly shows that the slope angle increasing, building is becoming stiffer for short columns where shear force is increasing [2]. Recently, researchers have been assessed the seismic response for different stories on sloping ground clearly conclude that the overall response of flat ground structures are much more suitable than sloping ground in hilly areas [3]. Generally, in hilly areas, column and slab thickness are varied in 0.127m to 0.178m and 0.038m to 0.0762m respectively for only causes due to light weight construction. That specific issues create the major aspect for vulnerability of elemental deformation show in Fig. 3. On the other hand, brick masonry walls are commonly damage due to ground motion show in Fig. 2 and sometimes by heavy land slide show in Fig. 4. for low flexible properties of brick material also a challenging aspect for controlling the damage from pre- and post-earthquake situation may built a justified guideline. The significant less amount of work has been done in this case, but the aperture indicates the judgmental response of sloppy ground structures due to seismic synthetic bi-directional ground motions for symmetric and asymmetric systems in a critical seismic zone IV in India. Moreover, different parameters are considered and lies in a feasible
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