Estimation of Structural Damage Through System              Identification
{'Code': '07030000', 'Directorate': {'Abbreviation': 'ENG', 'LongName': 'Directorate For Engineering'}, 'Division': {'Abbreviation': 'CMMI', 'LongName': 'Div Of Civil, Mechanical, & Manufact Inn'}}
{'SignBlockName': 'Shih-Chi Liu', 'PO_EMAI': None, 'PO_PHON': None}
This research project considers buildings and structures which are              damaged or fail during a strong earthquake. The behavior of damaged or          failed structures often becomes highly nonlinear and dependent upon the         history of loading. A common technique that is used to describe the             dynamic behavior of such structures, including the nonlinear and                history-dependent characteristics,  is to use a mathematical model with         parameters that change as the load is applied. The parameters are               estimated using some system identification technique in conjunction with        the recorded response of the structure. Many identification techniques          have been developed but a comparison and evaluation of the various              techniques is lacking.                                                                                                                                          The purpose of this project is to compare and verify the various                identification techniques. As a result, one or more of the techniques           will be used to assess the damage in a structure. In particular, an             attempt will be made to relate the changes  in the identified parameters        to the damage as it accumulates in a structure.                                                                                                                 The goal is to develop a mathematical model that will assist in making          decisions regarding the safety, or reliability, of a structure and the          need for repair or demolition.  The design of a structure for earthquake        resistance includes consideration of the interaction between gravity            loads and lateral displacements. This interaction, known as the P-Delta         effect, refers to a tendency for unidirectional yielding of the                 structure, which can lead to dynamic instability  and collapse of the           structure. A methodology to consider P-Delta effects in the design of           seismic resistant structures is lacking.                                                                                                                        The objective of this research is to develop such a methodology                 to consider the P-Delta effect and dynamic instability. The                     approach is based on the definition of the inelastic spectrum.                  The premise is that P-Delta effects can be included through                     spectrum modification, in a way that is similar to the methods                  used to incorporate the effects of ductility and damping.
{'FirstName': 'Garrett', 'LastName': 'Jeong', 'PI_MID_INIT': 'D', 'PI_SUFX_NAME': None, 'PI_FULL_NAME': 'Garrett D Jeong', 'EmailAddress': 'gjeong@ecn.purdue.edu', 'NSF_ID': '000444872', 'StartDate': '07/01/1987', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Purdue Research Foundation', 'CityName': 'WEST LAFAYETTE', 'ZipCode': '479064353', 'PhoneNumber': '3174946200', 'StreetAddress': '1281 WIN HENTSCHEL BLVD STE 2500', 'StreetAddress2': None, 'CountryName': 'United States', 'StateName': 'Indiana', 'StateCode': 'IN', 'CONGRESSDISTRICT': '04', 'CONGRESS_DISTRICT_ORG': 'IN04', 'ORG_UEI_NUM': 'C1G1LGYJF5G5', 'ORG_LGL_BUS_NAME': 'PURDUE RESEARCH FOUNDATION', 'ORG_PRNT_UEI_NUM': 'YRXVL4JYCEF5'}
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{'Code': '1498', 'Text': 'STRUCTURES II'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1987&All=true', 'xml': '8707098.xml'}