The Quintuple Friction Pendulum (QTFP) system is a new generation sliding isolation having six spherical sliding surfaces with five effective pendula. Due to multiple sliding surfaces, QTFP system shows highly adaptive behavior under different hazard level of earthquakes, despite being a passive system. The paper describes mathematical model and seismic response of QTFP system under 60 earthquake records consisting of service level, design basis and maximum considered earthquakes. To study the effect of directivity focusing and fling step, additional 15 records consist of far-field, near-fault with forward directivity and fling step effect are also considered. Three types of effective period and effective damping in combination with two different displacement capacities of QTFP bearing resulting in six isolator designs are considered. The seismic demand parameters like base shear, top floor absolute acceleration and isolator displacement have been studied. It is found that the QTFP bearing stiffens at low input, softens with increasing input, and then stiffens again at higher levels of input. Thus, it shows highly adaptive behavior under different hazard levels of earthquake. Further, due to forward and backward momentum conveyed by the directivity pulse, near-fault directivity effect imposes higher demand compared to fling step containing only forward momentum.
There has been a constant increase in the population of India. A large percent of the population is not able to afford their own homes owing to the increasing living costs. It is the need of the hour to adopt for cost effective housing solutions. The depletion in availability of natural resources and the climatic conditions has forced engineers to look for a more greener construction material. Thus a greener as well as an economical construction material is sought. Bamboo, because of its innumerable qualities may emerge as the necessary solution. Bamboo is available in abundance in the tropical and subtropical regions of India, China, Malaysia, Philippines, etc. and using it to its full potential may solve the housing needs of India. A review regarding the suitability of bamboo constructions so as to introduce a new low cost construction structural material to satisfy the housing needs of the poor has been presented here.
Abstract.The Seismic hazard study was carried out for Maharashtra state, Bombay (Latitude 18.940 N, Longitude 72.840E).In the present study the geological fault is known as West coast fault and Son Narmada Faults were studied and used for the earthquake simulation, extended finite fault method originally FINSIM given by M. Atkinson (1998), was used to simulate 10 an earthquake of 6.
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