Issue 36

H. Zhu, Frattura ed Integrità Strutturale, 36 (2016) 191-200; DOI: 10.3221/IGF-ESIS.36.19 196 and bound with winding sires. After pouring of concrete is over, initial readings on the strainometer are tested to confirm its normal operation. Layout of on-the-spot observation spots: To meet the requirements on loading bearing and rigidness of the structure, four corner posts are designed into L-shaped multilateral columns. Load of columns, evenly distributed load of floors and live load of floors are transmitted to every column through column. Strain sensors are installed on the corner posts on the bottom floor, 10 th , 19 th , 29 th , 35 th , 36 th , 39 th , 42 th and 45 th floor and every corn post is set with two observation spots. Besides, the horizontal coupling beams of the corner posts on the 5 th , 18 th and 38 th floor are installed with strain sensors. To be specific, the upper and lower flanges of corner posts are installed with sensors, one on each side. Strain rosettes are installed on web plate. In this way, the bending moment and shearing force loaded by the steel beam can be monitored. A NALYSIS WITH SAP2000 SOFTWARE [21] Procedures of analysis of SAP2000 software SAP2000 is a finite element analysis software aiming at structure and it provides various forms of unit composition. Herein we adopt SAP2000 to make a force analysis on the simulated structure during construction. The analysis procedures are shown in Fig. 5. Figure 5 : Procedures of analysis with SAP2000. Note : axis net: right click, edit data of axis net and add new systems; define material: define steel and concrete, but when there is no materials which need to be defined in quick addition of materials, user-defined is needed; define section: frame unit is used to stimulate beam, column, inclined strut, truss, net rack and so on; draw model: section is usually drawn after definition is over; exert support restrain: switch to the top layer - select joint of support which needs to be defined – restrain the specified joint; define analysis case in non-linear stage: define – load pattern including dead load, live load, wind load, etc. Model simplification The achievable level of SAP2000 was improved to ensure the practicability and accuracy of the analysis. A building model which was 48-floor high was simplified. In the process of non-linear simulation analysis, only the weight of structure was considered, and the ffect of live load and earthquake on the deformation of structure was not taken into account. To simply modeling and calculation, the fresh concrete was given an initial age of five days. When the model was being established, compressive strength, elastic modulus and time-varying properties of contraction and creep of concrete were considered. Finite element method was used to divide the plate. Considering effect of the rigidness of floors, the time- varying property of concrete material was not taken into account in the process of simplification of floor design [21]. Using the simplification method mentioned above, we set up a model using definite element analysis software (Figs. 6 and 7).