Study On Temperature Crack Of Over-long Concrete Frame Structure And Deformation Coordination Of Beam-slab System

Concrete structure is widely used in industrial and civil construction engineering withthe enhancement of national economic power and the enlargement of construction strengthsince Chinese reform and opening up. The usage of reinforced concrete structure tends to becomplex and high-leveled, and a great amount of large volume concrete structure andover-long concrete structure spring up in the actual engineering in the process of high speedmodernization. Meanwhile, the problem of temperature cracks in large volume concretestructure and over-long concrete structure emerged. As a kind of large volume concretestructure, over-long concrete structure’s temperature effect is obvious due to its greatsensitiveness to temperature changes. This paper studied the temperature effects ofover-long reinforced concrete frame structure. Due to its super-long concrete framestructure, the accumulated deformation of over-long concrete structure along the directionof long side is bigger with the heat-expansion and cold-contraction, which is affected byinternal and external constraints and causes stress in the concrete, and cracks forms whenthe stress is too large. Cracks will affect the durability of the structure. If the crack is toowide, it will affect the normal use in buildings and even bring potential security risks.Previous studies have only focused on slab-column structure or the slab-column structuresthat converted from the beam slab structures. However, there are few studies on thebeam-slab deformation coordination. The author studied temperature cracks of thebeam-slab frame structure under the condition of the beam’s effect and specifically exploredthe deformation coordination of beam slab.The author expounded the research background, research significance and researchstatus at home and abroad of the over-long concrete structure based on the study oflarge-volume concrete’s temperature stress and then gave the definition of over-longconcrete frame structure. The author discussed concrete temperature stress theory based onthe basic principle of heat conduction theory and gave the calculation method oftemperature stress of over-long reinforced concrete frame structure. The author also introduced the mechanism of formation and expansion of the concrete cracks and thetemperature effect of concrete and the control level of the cracks.The author applied finite element software ANSYS to make solid model of super-longreinforced concrete frame structure on the basis of the structural design with the structuraldesign software PKPM and analyzed the data of the temperature stress and cracks. Theauthor analyzed the whole structural deformation change under various conditions, thesituation of longitudinal horizontal displacement of the top column, temperature stress ofbeam and slab, temperature stress of frame column, and temperature stress distribution ofnode area while controlling the change of temperature and column based on four differenttemperature differences () and four different column height (H).In addition, the author studied the temperature deformation coordination of beam-slabsystem separately to explore the beam-slab temperature deformation coordinationmechanism and deduced the calculation formula of the average internal force caused bybeam-slab deformation coordination. The author analyzed the law of complex stressdistribution of contact surface of beam and slab along the beam length direction. The authorfigured out the law of the complex stress distribution of contact surface of beam and slaband the distribution situation of the internal stress of beam slab by applying the ANSYSfinite element software to conduct a simulation analysis carried out on the beam-slabdeformation coordination.The research results have a certain referential function and guidance significance forthe crack controlling of over-long concrete structure.