Issue 36

H. Zhu, Frattura ed Integrità Strutturale, 36 (2016) 191-200; DOI: 10.3221/IGF-ESIS.36.19 195 Figure 4 : Entitative graph of Shenzhen Peace Finance Building. Note : Floor 1 ~ 3 are commercial districts; floor 4 ~ 6 are installed with giant cantilever truss; and the 6th floor above are office areas. Test instruments XHX-115W embedded strainometer, XHX-215W surface strainometer and XHX-322W reinforcement meter were used as test instruments in this study. XHX-115W embedded strainometer is usually embedded in beam, column, pile foundation and retaining wall to monitor development rule of strain and stress [18]. The calculation formula is as follows. 2 f K    (4) 0      i (5) where ε stands for absolute strain capacity (10 -6 ), f stands for wire vibrating frequency, K stands for calibration coefficient (K =0.002), ε i stands for strain in state i (i.e., at the moment of deformation) (unit: με), ε 0 stands for strain at time 0 (unit: με), and ᇞ ε stands for relative strain value (unit: με). ) (8.1 ) ( 0 0 TT i        (6) where T stands for measured temperature in state I (i.e., at the moment of deformation) and T 0 stands for measured temperature at time 0. Major test works Test works mainly involve template erection of floor above the measured floor, beam-column and plate-column rebar binding of floor above the measured floor [19], concrete pouring above the measured floor, removal of template of floor above the measured floor, removal of template of floor above and below the measured floor, large live load such as loading or uploading of large equipments and materials [20] and adjustment of times of tests according to special conditions appearing during construction. It should be pointed out that, on-the-spot monitoring is needed during concrete pouring so as to prevent strainometer from the damage of vibration and protection of port of strainometer is also needed. Experimental test Setting and installation: First, observation spots needs to be selected according to structure requirements and designing scheme. Then a strainometer is installed paralleling to the direction of strain. Whether protection cover for the mounting base of strainometer needs to be installed or not depends on testing requirements. Testing wires are led along with steels