Seismic Performance Influenced By Stiffness Ratio Of Rocking-wall And Frame Structrue

Frame Rocking-structure is a new emerging seismic structural system, which transforms solid joint to hinge to make the bottom certain rotation ability and larger lateral stiffness by making sheer wall at the bottom Rocking-wall structure can control the lateral deformation pattern effetely by rod end constraints as the component throughout the whole structure, which can also avoid lager yield failure mechanism at earthquakes to make the structure a overall yield failure mode.The dissertation simulates several kinds of structure system with different stiffness ratio to figure out seismic performance by software SNAP. What is more, it also simulate several kinds of frame structure(A,B,C and D)with different lateral stiffness ratio to work out seismic performance fixed with equivalent stiffness ratio. The paper imitates damaged frame structure to make further research that how the stiffness effects seismic performance of frame structure by changing damage degree and stiffness ratio. The result shows:As for frame structure, frame structure can improve energy dissipating capacity itself, which increases with lateral stiffness ratio. The energy-dissipating capacity of structure tends to be stable when lateral stiffness ratio reaches 9.0%.The bigger lateral stiffness, the bigger energy-dissipating capacity as for different kinds of structure with different lateral stiffness fixed with same stiffness ratio Rocking-wall. As for frame structure with same height and different lateral stiffness, the largest vertex displacement are all the same, not effected by the lateral stiffness itself.Rocking-wall structure can decrease DCF. There in the same DCF-α curve with same stiffness ratio fixed with different lateral stiffness, which shows that lateral stiffness of itself does not influence DCF-α curve, which is determined by stiffness ratio.As for damaged frame structure, more damage degree, more maximum story drift for different kinds of earthquakes. The maximum drift story of different damage degree becomes stable when the stiffness ratio is over 2%, which does not matter with earthquake waves.As for frame structure, accelerated speed of top story reached the maximum point but unevenness for others with displacement concentration. With the increase of stiff of frame structure, the acceleration envelope curve of frame structure tends to increase from bottom to the top.