Issue 36

H. Zhu, Frattura ed Integrità Strutturale, 36 (2016) 191-200; DOI: 10.3221/IGF-ESIS.36.19 191 Crack formation of steel reinforced concrete structure under stress in construction period Hua Zhu College of Civil Engineering, Campus on Avenue Hope, Yancheng Institute of Technology, Yancheng, Jiangsu, China. zhuhuazh2233@163.com A BSTRACT . To obtain deformation rules of steel reinforced concrete structure under stress, this study explored the crack formation in construction period. A novel structure system – steel reinforced concrete structure with shear wall and truss at the bottom was analyzed using on-the-spot test in combination with theoretical simulation analysis with SAP2000 software. It was found that, factors influencing crack formation of steel reinforced concrete structure in construction period included construction load, creep of concrete, shrinkage of concrete, displacement of bond of section steel and concrete as well as leveling. In the construction period, the simulated results and the measured results were highly fitted under the influence of time-variant characteristics such as compressive strength, elasticity modulus, creep and shrinkage. Through processing and analyzing the measured data, we obtained the development rules of crack formation of steel reinforced concrete structure with different strength grades as well as deformation rules of time-varying structure system in construction period, figured out the reason for the difference between the simulated results and the measured results, analyzed the deformation of structural components under stress in construction period and proposed some suggestions. This work is beneficial to ensure safe and high-efficient operation of construction. K EY WORDS : Crack; Steel reinforced concrete; Stress in construction period; Theoretical simulation analysis; SAP2000. I NTRODUCTION ith the development of economy, steel reinforced concrete structure has been applied more extensively in super high-rise building for its special advantages of high bearing capacity, large rigidity, sound anti-seismic property and convenient installation [1]. In modern construction, construction safety is especially important. Hence major factors influencing crack formation of steel reinforced concrete structure needs to be further studied [2, 3]. Large binding force between section steel and concrete is the foundation ensuring their coordination in steel reinforced concrete structure [4]. Section steel, rebar and concrete coordinate together to resist external effect, thus fully display the advantages of steel reinforced concrete structure [5]. On account of this, it is of great significance to deeply study steel reinforced concrete, explore its structure performance and apply it into engineering practice [6]. Based on the detailed cases of crack formation of steel reinforced concrete structure in actual engineering and the previous research achievements, Deierlein and Noguchi [7] obtained the distribution rule of load of steel reinforced concrete structure and the prediction model of compressive strength, shrinkage and creep of concrete, providing a theoretical basis for analysis of performance of steel reinforced concrete structure and factors influencing crack formation W