Column Bearing Type Silo Abnormal Twist Joint Crack Reason Analysis

In the high- rack steel silo wall and pillar connections and silo wall and the funnel and turning connections are prone to the phenomenon of stress concentration, resulting in structural cracks. So evolutionary characteristics and mechanisms of reinforced concrete structure transition joints cracking has important theoretical significance and practical value.In this paper, a high-frame structural cracks steel silos concrete support structure appears on the background, to explore the causes of cracks turn junction.First of all, to the real structure of the project testing, testing means including appearance quality detection, basic, component strength inspection, reinforced position detection, the structural size, column vertical degree detection, and limited load experiment and so on. Test results show that: with a limited load test loading loading loading material reaches 7280 k N East Wharf, the inner frame capitals crack width no significant changes, no cake cracking plaster paste. After finishing the calculation of field data, silo bottom frame columns and frame beam carrying capacity to meet regulatory requirements. Comprehensive field test data analysis, large temperature changes affect the internal force structures. The structure of the frame column temperature stress had a greater axial force and bending moment, in concrete construction joints and other weak parts, partial pressure near the concrete surface, the concrete construction joints beneath the surface cracks; In addition to crack the emergence and development of the wind load has the adverse effect.To explore the structural causes of cracking, finite element analysis software ANSYS to simulate the impact of structural loads analysi, differential settlement of the foundation and thermal stress on the structure, geometric nonlinear buckling analysis and plastic buckling behavior of columns supporting steel silos the stability of the system can do research. The results show that the structure of the beam inside the ring after a small margin compression settlement no significant effect on the structural cracking. Cracking parts inside of twist joint along the direction of oblique beam lateral shearing on the column. Sunshine effect of temperature stress for crack structure produced under conditions of short positions is produced mainly in the outer ring beam. Considering the heat of hydration, after settling occurs at different tensile strength of concrete, cracks occurred mainly in the inner and outer turning point connection column, and the inner ring beam and inclined beams at the junction of the largest crack development. Numerical simulation results consistent with the structure of cracking the case.