Kealakaha Stream Bridge Replacement Project Seismic Instrumentation Plan.
Abstract
This report outlines the research undertaken for the development of a seismic instrumentation and monitoring plan, to be proposed to the Hawaii Department of Transportation (HDOT), for the Kealakaha Stream Bridge Replacement Project. The Kealakaha Stream Bridge will replace the old Kealakaha Stream Bridge, located 21 miles north of Hilo, Hawaii, with a new 645 foot structure. Construction is expected to begin in late 1997 (HDOT, 1995). This study utilizes information contained in several California Strong Motion Instrumentation Program (CSMIP) Data Utilization Reports to analyze and interpret the engineering and theory associated with bridge structure instrumentation and monitoring. In addition, these reports were used to investigate the types of information that can be obtained from acceleration data and what methods were used to process the data. The proposed seismic instrumentation plan consists of 41 seismic accelerometers, 4 relative displacement sensors and three data recording units. All instruments and recorders are interconnected and have direct download capability to various research centers. The instruments will monitor and record the full motion of the structure, including free-field motion, pile cap translation and rotation, deck and abutment accelerations, joint movement and column bent rotation. The acceleration data provided by the proposed instrumentation will be used to identify the structure's fundamental and most significant frequencies, calculate deck level acceleration amplification functions, investigate soil-structure interaction effects, and compare the design analytical model with the recorded motion of the structure.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1996
- Accession Number
- ADA312532
Entities
People
- Todd W. Stephens
Organizations
- Naval Postgraduate School