Dynamic Modeling of Large Precast Panel Buildings Using Finite Elements with Substructuring.

摘要

There is presently little known about the dynamic behavior of LPPB systems. This report is a preliminary investigation of the dynamic response characteristics of these systems. The structure is assumed to respond elastically and is modeled using statically condensed super elements to represent the panels and anisotropic finite elements to model the connections. A typical building system is defined and the sensitivity of the dynamic response to several parameters examined. These parameters include the height of the structure,the width of the panel,the relative stiffness of the connection,the percent critical damping,and the variability in the expected ground motion. It was determined that the linear dynamic response of LPPB systems is similar to that of a shear wall structure. Response was found to be primarily in the first mode for shorter structures,while for taller structures the higher modes became important. The relative stiffness of the connections (after significant degradation) was found to have a significant influence on the nature of the response,especially in the shorter structures and higher modes of vibration. Displacement demands on the connections were also significantly influenced by the relative stiffness of the connection.