Response evaluation of high-rise reinforced concrete structures considered P-Δ effect

The P-δ effects have an influence on high rise Reinforced Concrete structures as well as high rise Steel structures. We examined influence of the P - δ effects for high rise RC structures by seismic response analysis with the 48 story lumped mass system model. The increase of a response by the P - δ effects brings increase of the strain energy and liberation energy of the P - δ effects. And, if a stability factor becomes large, these energy increases. Second, the increase rate of a response in consideration of the P - δ effects has unevenness by influence of hysteresis characteristics of RC structures. This increase rate can estimate with a stability factor and ductility factor when a response does not have influence of deflection.