Accession Number : ADA312532

Title :   Kealakaha Stream Bridge Replacement Project Seismic Instrumentation Plan.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CA

Personal Author(s) : Stephens, Todd W.

PDF Url : ADA312532

Report Date : JUL 1996

Pagination or Media Count : 81

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.

Descriptors :   *SEISMIC DATA, *INSTRUMENTATION, *MONITORS, *HAWAII, *BRIDGES, MATHEMATICAL MODELS, DATA MANAGEMENT, MONITORING, ACCELEROMETERS, INTERACTIONS, ACCELERATION, STRUCTURES, MOTION, SOILS, REPLACEMENT, RECORDING SYSTEMS, CALIFORNIA, AMPLIFICATION, ROTATION, UTILIZATION, STREAMS, SEISMOMETERS, SHIP BRIDGES.

Subject Categories : Seismology
      Civil Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE