STRAND TENSION CONTROL IN ANCHOR SPAN FOR SUSPENSION BRIDGE USING DYNAMIC BALANCE THEORY

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DA WANG
WEI ZHANG
YONGMING LIU
YANG LIU

Abstract

STRAND TENSION CONTROL IS ESSENTIAL IN SUSPENSION BRIDGE SAFETY. HOWEVER, FEW QUANTITATIVE STUDIES HAVE EXAMINED THE BENDING RIGIDITY AND BOUNDARY CONDITION BEHAVIOR OF STRANDS IN THE ANCHOR SPAN OF SUSPENSION BRIDGES BECAUSE OF THEIR SPECIAL STRUCTURE AND COMPLEX CONFIGURATION. IN THIS PAPER, A NEW CALCULATION METHOD FOR STRAND TENSION IS EXPLORED BY USING DYNAMIC BALANCE THEORY TO DETERMINE THE EFFECT OF BENDING RIGIDITY AND BOUNDARY CONDITIONS. THE ACCURACY AND EFFECTIVENESS OF THE PROPOSED METHOD ARE TESTED AND CONFIRMED WITH VERIFICATION EXAMPLES AND APPLICATION ON NANXI YANGTZE SUSPENSION BRIDGE IN CHINA. THE RESULTS INDICATED THAT ONLY LOW-ORDER FREQUENCY CALCULATION COULD BE USED TO CALCULATE THE STRAND TENSION WITHOUT CONSIDERING THE EFFECT OF BENDING RIGIDITY TO ENSURE CONTROL ACCURACY. THE INFLUENCE OF BENDING RIGIDITY ON THE CONTROL PRECISION IS RELATED TO THE TENSION AND THE LENGTH OF THE STRANDS, WHICH IS SIGNIFICANTLY DETERMINED BY THE SPECIFIC VALUE BETWEEN THE STRESS RIGIDITY AND THE BENDING RIGIDITY. THE UNCERTAIN BOUNDARY CONDITIONS OF THE ANCHOR SPAN CABLE, WHICH ARE FIXED BETWEEN CONSOLIDATED AND HINGED, ALSO HAVE A MAJOR EFFECT ON THE CONTROL ACCURACY. TO IMPROVE THE ACCURACY OF STRAND TENSION CONTROL, THE LEAST SQUARES METHOD IS PROPOSED DURING THE TENSION CONSTRUCTION CONTROL OF THE ANCHOR SPAN. THIS APPROACH CAN SIGNIFICANTLY IMPROVE THE ACCURACY OF THE TENSION CONTROL OF THE MAIN CABLE STRAND. SOME RECOMMENDATIONS FOR FUTURE BRIDGE ANALYSIS ARE PROVIDED BASED ON THE RESULTS OF THIS STUDY.

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Author Biography

DA WANG, SCHOOL OF CIVIL ENGINEERING AND ARCHITECTURE, CHANGSHA UNIVERSITY OF SCIENCE & TECHNOLOGY

DR. DA WANG COMPLETED HIS B.S, M.S. AND PH.D., STUDIES ALL AT CHANG’AN UNIVERSITY, XI’AN, WHERE HE RECEIVED A B.S, A M.S. AND A PH.D DEGREE IN BRIDGE ENGINEERING IN 2002, 2005 AND 2008, RESPECTIVELY. HIS PRIMARY RESEARCH INTERESTS ARE THEORY ANALYSIS OF BRIDGE STRUCTURE, STEEL-CONCRETE COMPOSITE STRUCTURE AND MONITORING OF BRIDGE CONSTRUCTION. AS THE PRINCIPAL, DR. WANG PARTICIPATED IN THE MONITORING OF FIFTEEN LONG-SPAN BRIDGES CONSTRUCTION AND MORE THAN ONE HUNDRED BRIDGES’ REINFORCEMENT DESIGN. AT THE SAME TIME, HE ALSO RECEIVED A NUMBER OF FUND PROJECTS SUPPORT, SUCH AS THE NATIONAL BASIC RESEARCH PROGRAM OF CHINA (2015CB057700), THE NATIONAL NATURAL SCIENCE FOUNDATION OF CHINA (51308071), THE NATURAL SCIENCE FOUNDATION OF HUNAN PROVINCE (13JJ4057) AND THE OPEN FUND OF INNOVATION PLATFORM IN HUNAN PROVINCIAL UNIVERSITIES (12KB76).