Research On The Mechanical Behavior Of The Cable Supported Structure Based On The Cable Fine Physical Characteristics

With both the promotion of engineering application and the development oftheoretical research on prestress steel structure, the fine numerical simulation analysishas became an effective method to analysis the whole life cycle behavior of theprestress steel structure. As the key component of the prestress structure, thedetermination of the values of the expansion coefficient, elasticity modulus of thesteel cable and the damping of structure with the steel cable are directly related to theaccuracy of the fine numerical simulation analysis. Besides, with the innovation ofnew prestress steel structure system and steel cable joint, a series scientific problemson the analysis and design of the prestress steel research have also been put forward.Based on the above problems, both the numerical analysis and experimental researchhave been used to conduct a systematic and deep research on the prestress steelstructure in this paper. Several research results with great importance in scientificresearch and engineering application have been obtained:The extension deformation compatibility of the steel cable under the temperatureeffect was established. The formula of thermal expansion coefficient of steel cableswas devised. On the basis of the thermal expansion equation of the cable, the thermalexpansion coefficient measuring instrument was proposed. The thermal expansioncoefficients of the steel-wire rope cable, steel strand cable and steel tendon cable,were determined. Meanwhile, the theoretical analysis on thermal expansionmechanism of steel cables was verified. The influence regularity of the cableexpansion coefficient on the cable supported barrel vault structures performanceunder the temperature effect was researched and verified by a scale model of the cablesupported barrel vault structure, whose span is3.3m. The research results have beenorganized into technical specification for prestressed steel structure and technicalspecification for spatial grid structure of Tianjin.The compatibility equations of deformation of the steel cable and the equationsof mathematical physics of the wire were established. The evaluation approach on theelasticity modulus of steel cable was developed and reduction factor of cable elasticitymodulus was proposed. Then, the influence of the twisting way, lay pitch, thediameter of the steel wire and temperature effect on the cable elasticity moduls wasdiscussed. The influence regularity of the cable failure on the stability performance of the suspendome was investigated preliminary.The dynamic characteristic of cable-supported barrel vault structures was studied,and the influence regularity of rise-span ratio and sag-span ratio was obtained. Abaseon the complexity of the space structure and the reliability of the system identification,a new method to obtain dynamic characteristics of the cable supported structure wasproposed. Taking a suspendome for example, the validity and reasonable of thismethod was verified. The influence regularity of cable force, the number and locationof measure point, output signal and soon were discussed.The cable joint of reinforcing welded penetrated tubular was proposed, and thedesign formulas of the joint bearing capacity were derived. According to theverification test of object specimens, the destructive test of scale model specimens andnumerical analysis, the mechanical properties and failure modes of the cable joint ofreinforcing welded penetrated tubular was studied systematically. Meanwhile, thetechnical problem of missing inspection and misjudgment in the complicated forces filedwas solved by using themoire intervention, and the safety and reliability of the jointswere comprehensively verified.