Issue 36

H. Zhu, Frattura ed Integrità Strutturale, 36 (2016) 191-200; DOI: 10.3221/IGF-ESIS.36.19 199 It can be seen from Fig. 12 that, development rate of the measured value of the deformation of steel reinforced concrete (C40) column was large in early age, much larger than that of the simulated value; but development rate of the measured value of the deformation was smaller than that of the simulated value in the late stage. C ONCLUSION ith the rapid development of economy and constant progress of society, high-rise building has been favored by more and more people [22]. Steel reinforced concrete structure featured by high bearing capacity, good anti- seismic performance and good ductility has been applied more and more in high-rise building. Hence it is of great importance to understand the crack formation of steel reinforced concrete structure under stress in construction period. In this study, we discussed over the reasonability of definite element analysis of steel reinforced concrete structure [23]. It can be known from the actual measurement of deformation that, deformation rate of steel reinforced concrete (C60, C50) column in low floor became higher than the simulated value in the late period; and the vertical deformation of steel reinforced concrete (C50, C60) column was smaller than that of steel reinforced concrete (C40) column [24]. During construction, deformation of structural component and accumulation of stress are different as construction order and procedures of exerting construction load are different. Timely adjusting strength and section size of steel reinforced column of internal and external tubes can not only save building materials and narrow the gap of vertical deformation, but also benefit structural safety and construction [25]. The number of floors has large impact on accumulative vertical deformation difference. With the increase of the number of floors, accumulative vertical deformation of vertical component sharply increases. But the impact of construction speed on accumulative vertical deformation difference is small. In such a special structural system, accumulative deformation of steel reinforced concrete column of internal and external tubes is different. With the increase of constructed floors and load, accumulative deformation difference becomes larger. During construction, relevant measures need to be adopted to avoid the generation of additional stress. S UGGESTIONS FOR CONSTRUCTION everal points are suggested for construction. First, the adjustment of fabrication length is needed in the construction [26]. Preadjustment measures can be considered to deal with the deformation of steel structure. When construction period is short, form removal should be performed in advance [27]. Besides, rigid connection needs to be performed after hinged connection. Strain of column needs to be improved if construction slows down due to the influence of development of strength of column and support system [28]. Concrete placement sequence needs to be ensured consistent in every area of every floor [29]. Field needs to be utilized effectively to accelerate the progress of construction. R EFERENCE [1] Zheng, S., Su, Y., Zhang, W., Li, Q., Experimental study on seismic performance of joints in the castellated portal frame of light-weight steel, Building Structure, 44(12) (2014) 80-84. [2] Yang, X., Xueyi, FU., Dynamic elasto-plastic analysis of the Shenzhen Ping'an Financial Center Tower, Journal of Building Structures, 32(7) (2011) 40-49. [3] Baev, A. R., Asadchaya, M. V., Features of the reflection of an acoustic beam from a surface with nonuniform boundary conditions, I. Theoretical analysis, Russian Journal of Nondestructive Testing, 46(8) (2010) 547-558. [4] Huttunen, H., Tohka, J., Model selection for linear classifiers using Bayesian error estimation, Pattern Recognition, 48(11) (2015) 3739-3748. [5] Gerilla, G. P., Teknomo, K., Hokao, K., An environmental assessment of wood and steel reinforced concrete housing construction, Building & Environment, 42(7) (2007) 2778-2784. [6] Vayas, I., Adamakos, T., Iliopoulos, A., Three dimensional modeling for steel-concrete composite bridges using systems of bar elements — Modeling of skewed bridges, International Journal of Steel Structures, 11(2) (2011) 157- 169. [7] Deierlein, G. G., Noguchi, H., Overview of U.S.–Japan Research on the Seismic Design of Composite Reinforced Concrete and Steel Moment Frame Structures, Journal of Structural Engineering, 130(2) (2004) 361-367. W S