| Modular Intergrated Building（MIC）has been becoming a high-level form in the field of prefabricated buildings.The application of this system has achieved a high degree of assembly integration and intelligent industrialization of buildings,and it has the advantages of environmental protection and energy saving.The research object of this paper is based on the new MIC product developed by China Construction Hailong Company.This product is a box-shaped structural unit assembled by prefabricated PC components,which is divided by the use function of the room.The integration of water and electricity and decoration can be realized at the same time in processing and manufacturing,which greatly shortens the later construction and decoration period and improves the construction efficiency.Among them,the key point and innovation of the new MIC module is the application of 30 mm thick concrete formwork wall panels（MIC panels for short）.The MIC panels not only serves as the enclosure and isolation component of the module unit,but also can be used as the casting template on one side of the whole MIC building shear wall or top beam.However,MIC panels is prone to crack,mold expansion,slurry leakage and other defects under the lateral pressure caused by concrete pouring.To effectively solve the above problems and improve the strength,rigidity and crack resistance of MIC panels,in this paper,five groups of MIC wall panels with different material types are designed,which are C40 concrete MIC wall panel,C60 concrete MIC wall panel,C60 steel fiber concrete MIC wall panel,C60 concrete MIC wall panel with fiber grid cloth and C60 concrete MIC wall panel with decorative tiles,taking the concrete raw materials used to make MIC wall panels and auxiliary materials used to process MIC wall panels as research variables.Then,the stress and cracking of MIC panels under lateral pressure of concrete are simulated by static load test,and the strength,stiffness and bearing capacity of MIC panels are analyzed according to the collected test data of stress and deflection.Finally,combined with the results of finite element simulation,the differences of mechanical properties of different MIC panels are obtained,and the aggregate types of wallboard with the best working performance are summarized,which provides theoretical reference for optimizing the production process of MIC panels.The results show that:（1）the crack development,distribution and deformation of all types of MIC panels are basically the same: the cracks are all developed in the first stressed area,and with the increase of load,the cracks gradually extend through the whole board surface,and finally they will be destroyed after reaching the ultimate bearing capacity of the wallboard;（2）Combined with the test phenomena and test data of each specimen,it can be concluded from the analysis of the strength grade of concrete and the additional materials used: improving the strength grade of concrete can significantly enhance the crack resistance,bearing capacity,stiffness and strength of MIC panels;The use of steel fiber reinforced concrete can significantly improve the crack resistance and stiffness of MIC panels,but its ultimate bearing capacity is poor.The fiber grid cloth can improve the crack resistance of MIC panels,but has no significant effect on its overall strength,stiffness and bearing capacity.The MIC panels pasted with tile can improve its crack resistance and stiffness to a small extent,but weaken its ultimate bearing capacity.（3）The results of simulation calculation by ABAQUS can accurately correspond to the mechanical characteristics and test results of MIC panels in actual test,which proves that the plastic damage constitutive model,the setting of various material parameters,the grid type and division and other parameters selected for simulation are reasonable,which provides a method and idea for finite element calculation of mechanical properties of MIC panels.Figure [62] Table [18] Reference [63]... |
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