Research On Seismic Isolation Performance Of Asphalt Ointment Of Steel-Asphalt Isolation Lay

Earthquake is a devastating natural disaster, which endanger the national economy and people's lives and property. Our country is a seismic country where earthquake frequently happens and where seismic area is widely distributed. And our country is one of the world's worst earthquake disaster countries, where the most serious damage in rural area. With the rural areas in national economy becoming increasingly important, the seismic isolation has become even more significant.In traditional anti-seismic design the anti-seismic safety property of structure is ensured by way of raising the function of strength and strain of the structural members. With intensive development of scientific research and experiments all kinds of assumptions and methods of seismic reduction and seismic isolation have been proposed as the times require. Base Isolation Technology which has been matured in engineering applications is increasingly widespread. However, its high cost and complicated construction lead to unappropriate widely application of these technologies in the vast rural areas. Therefore, in response to a large number of low-rise masonry buildings in rural areas, this paper the paper proposes a new steel-asphalt isolation lay which has a low cost and uncomplicated construction.Firstly, this paper presents the basic principle of the base isolation, a new steel-asphalt isolation lay and simplified isolation lay model. Secondly, the cyclic simple shear test on asphalt filled between brick piers of the isolation lay is carried out. The result shows the relationship among dynamic shear modulus, damping ratio and shear strain of asphalt mixture under different proportion and vertical pressure. Then, using the rigid mass block in place of the low building which has a larger rigidity, the simulated test about two different kinds of isolation lay on shaking table is carried out. The result shows that the peak value of acceleration of the mass block of the two isolation lays both are obviously weakened when inputting different earthquake waves. The isolation lay filled with asphalt has a higher damping ratio than the other unfilled with asphalt. And the isolation lay filled with asphalt can reduce more acceleration and displacement reaction of the upper structure than the other.