Study on the construction monitoring was used to focusing on the Bridge and Tunnel. The construction of the steel structure workshop more and more appeared in the past few years, proper method of stress-strain monitoring of the key component while construction of steel structure workshop ,become particularly important factor to ensure the safety of construction process. Based on practical example of Jinbei automobile factory workshop, the paper describes the stress-strain monitoring of steel beam during column demolition. Through the design of test solution and the analysis of test data, get the suitable scheme of stress-strain monitoring, stress and strain field monitoring of the basic program, meeting the monitoring requirement whether steel beam is safe and reliable during column demolition, and could provide basis and support for similar conditions on-site monitoring.
16MnR is the typical material of pressure equipment which worked under complex stress state in engineering application. In order to be close to the actual combined tension-shearing stress state and explore the relationship of deformation capacity and different stress state, many groups of combined tension-torsion tests on 16MnR specimens were designed and the equivalent stress-strain relation under different stress state was obtained. The concept of stress triaxiaty (TS value) was cited to characterize the different stress state and the result showed different stress states have a great influence on the material plastic deformation capacity, TS value turns larger, the plastic deformation weakened; 16MnR has a strongest plastic deformation capacity in pure torsion; the level of tensile stress had no significant effect on the maximum stress in the biaxial stress state, but has a significant inverse relationship with the maximum equivalent strain .At last, the mathematical relationship between maximum equivalent-strain and stress triaxiaty could be found. If the stress state of one point in the engineering structures is certain, the maximum equivalent-strain can be estimated.
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