Pushover-QR Method For Static Elasto-Plastic Analysis Of High-Rise Buildings

Nowadays, elasto-plastic analysis has become an important part of seismic design of structure. Based on both domestic and foreign research results, combining the QR-method and the Pushover analysis method together, the author puts forward the Pushover-QR method for static elasto-plastic analysis of high-rise buildings, and compiles corresponding programmes in this paper. The Pushover-QR method still hires the ideology of regular Pushover method in static elasto-plastic analysis of seismic structures. By replacing the part of finite element with the QR-method in the process of Pushover analysis and making full use of the advantages of both QR-method and finite element, Pushover-QR method largely simplies the calculation of static elasto-plastic analysis of seismic structrues with relatively accurate results. At the same time, the paper has considered the contributions of higher modes when the lateral load patterns , target displacement and other aspects are determined. Pushover-QR method overcomes the shortcoming that the regular Pushover method can't be applied to the high-rise buildings which are effected by higher modes largely. In addition, the paper suggests a new ideology , inverse-deducing method , to determine the values of lateral load on each loading step ,during which plastic hinge will appear on at least one or a batch of member. So the number of load steps has been reduced largely. The Pushover-QR methed also can determine the expansion of plastic hinge in every member that offers helpful references about the determination of weak members. The procedure of the Pushover-QR method is appiled to calculate some examples, which show that the Pushover-QR method is an economic, efficient and feasible analysis method.