Abstract
The application of equal displacement rule simplifies the evaluation of lateral displacement demand forSDOF system. For complex multi-degree-of-freedom (MDOF) structures such as continuous bridge systems, however, it requires more investigations. In this paper, a comprehensive parametric study of the ratio of maximum inelastic displacement to maximum elastic displacement for typical continuous bridges is performedto advance the application of equal displacement rule to MDOF systems. Particurlarly for the bridges with long periods, this adapted methodlogy is further simplified. It is concluded that equal displacement rule of MDOF is applicable to continuous bridges when the periods of the main modes are no less than the limiting period, which usually serves as an indication to the level of inelastic deformation for a bridge subjected to an earthquake.
Highlights
The performance-based seismic design philosophy has been sufficiently developed to design a structure system to withstand a pre-defined level of damage under a pre-defined level of earthquake intensity
The displacement demand of the designed structure should be close to the target displacement, which reflects the predefined level of damage of earthquake intensity
The application of equal displacement rule is advanced into MDOF systemsthrough a comprehensive parametric study of the ratio of maximum inelastic displacement to maximum elastic displacement for a typical continuous bridge, which is subjected to earthquake excitation in the transverse direction
Summary
The performance-based seismic design philosophy has been sufficiently developed to design a structure system to withstand a pre-defined level of damage under a pre-defined level of earthquake intensity. Displacement-based seismic design is an efficient and accurate method to achieve the performance-based seismic design philosophy, and it has been proposed and developed in recent years (Kowalsky, 2002; Jameel, Islam, Hussain, et al, 2013). In this methodology, the displacement demand of the designed structure should be close to the target displacement, which reflects the predefined level of damage of earthquake intensity. It is desired to develop a simplified method to obtain the displacement demand to facilitate displacement-based seismic design
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