Collapse Simulation Of Plane Irregular Isolation Structures Subjected To Near-fault Seismic Motion

Isolation as an effective means of shock absorption in some of the earthquake toshow good performance and has been increasingly applied to practical engineering. Itis hoped that the isolated structure can be applied to near the earthquake zone. That’svery natural idea. However, in recent year’s worldwide scope for there were many bigearthquakes. It had a negative impact on long-period structures and isolated structuresseismic performance in near the earthquake zone. Meanwhile, in the vicinity ofnear-fault for the torsonal response of plane irregular base-isolated structure can notbe ignored. Therefore, it is very necessary that this paper study the analysis of thecollapse of the plane irregular isolated structures and non-isolated structuressubjected to near-fault seismic motion.The paper firstly analyzes earthquake resistant behaviour and the collapsedprocess simulation of base-isolated structures subjected to near-fault seismic motion.In1984New Zealand had already built the first lead laminated rubber pad core asisolation of components of the four building in the world. From then to now thesekind of base-isolated structures are now more common at home and abroad. Its safetyhas also been widespread concern. As the base-isolated structures of the naturalperiod is long, so the near-fault seismic motion on the seismic performance ofbase-isolated structures have an adverse effect. Plane irregular base-isolated structuremodel and non-isolated structure model are established based on MSC.MARC. Tochoose different near-fault seismic motions as input analyze non-linear simulation ofthese two structures. Results show that plane irregular base-isolated structure’storsion effect subjected to near-fault seismic motion relative to the non-isolatedstructure’s torsion effect obvious decrease. Meanwhile, the collapse simulation showthat plane irregular non-isolated structure is easier to collapse than plane irregularbase-isolated structure.What’s more, the paper also studies the dynamic response and the collapsedprocess characteristics of serial isolation structures subjected to near-fault seismicmotion. These kind of serial isolation structures are now more common at home andabroad. Its safety has been widespread concern. And the serial isolation structures ofthe natural period are long, so the near-fault seismic motion on the seismicperformance of serial isolation structures has an adverse effect. Therefore, the paperanalyse earthquake resistant behaviour and the collapsed process simulation of theplane irregular serial isolation structures subjected to near-fault seismic motion. Thesimulation analysis of nonlinear solution accuracy can be guaranteed through the establishment of collapse analysis of dynamic equation. Plane irregular serialisolation structures model and non-isolated structure model are established based onthe dynamic equation. To choose different near-fault seismic motions as input analyzenon-linear simulation of these two structures. Comparing the dynamic response ofplane irregular serial isolation structure and non-isolated structure subjected tonear-fault seismic motion，and sum up the law. Building isolation and non-isolatedstructure collapsed model analyze to resist collapsed ability of these two structures.Results show that plane irregular serial isolation structure’s torsion effect subjected tonear-fault seismic motion relative to the non-isolated structure’s torsion effectobvious decrease. Meanwhile, the collapse simulation shows that plane irregularserial isolation structure doesn’t collapse when plane irregular non-isolated structurecollapse. This shows the isolation structure is more secure.