Influence of Early-Arriving Pulse-Like Ground Motions on Ductility Demands of Single-Degree-of-Freedom Systems

ABSTRACT

Rupture directivity effects cause a large pulse to arrive at the beginning of the motion. However, not all early-arriving pulses are caused by the forward-directivity. The main focus of this study is on whether forward-directivity records affect structures in the same manner as other early-arriving pulses. An extensive parametric study investigating the inelastic response of degrading and non-degrading SDOF systems is conducted. Results show that in the short period region (T<0.7 sec), the non-directivity early-arriving pulse-like motions impose larger ductility demands. For intermediate period (0.7 < T < 3.5) systems, directivity motions induce larger displacement demands.

KEYWORDS:

• Early-Arriving Pulse-Like Ground Motions
• Single-Degree-of-Freedom (SDOF) Systems
• Seismic Ductility Ratio
• Seismological Parameters
• Degrading and Non-Degrading Models

Additional information

Funding

Support for this research provided by the National Key Research and Development Plan (No. 2016YFC0701108), the National Natural Science Foundation of China (Nos. 51322801, 51238012, and 51708161), the Outstanding Talents Jump Promotion Plan of Basic Research of Harbin Institute of Technology, and the National Science and Technology Major Project (2013zx06002001-09) is greatly appreciated.