Study On Mechanical Property Of The Precast Shear Wall Wallboard In The Hoisting

As for the hoisting points of the prefabricated wallboard are generally selected based on the past experience,it often causes that the large deformation and the over-limited cracks are appeared on the prefabricated component which are the quality problems.While in the process of demoulding the prefabricated component,the failed arrangements of the hoisting points often cause the prefabricated component demoulded difficultly,and making the prefabricated component damaged,and even causing the moulds deformed,therefore,it needs the relevant simulation results and experiments to determine the best hoisting mode and the best arrangements of the hoisting points when the prefabricated component in the demoulding process.The paper is based on a huge mass of data which is collected in the precast production factory and the construction site,using the method of the theoretical calculation and the numerical simulation to analysis and research the demoulding hoisting process,the hoisting method and the installation at construction site of the prefabricated wallboard,calculating and simulating the arrangements of the hoisting points on the prefabricated wallboard which is the key factor,finally getting the best hoisting mode and the best arrangements of the hoisting points of the different prefabricated wallboard.The paper mainly studies the stress performance of the prefabricated concrete wallboard which is the industrial production and the best hoisting mode and the best arrangements of the hoisting points when the wallboard is demoulding in the factory or installing at construction site,to ensure that the prefabricated concrete wallboard is safe in the hoisting.The research is done by the method of the field investigation,the theoretical analysis and the finite element simulation,mainly studies the following work:(1)According to the two points hoisting beam method,getting the calculation formula of the arrangements of the four points hoisting of the asymmetrical precast shear wall wallboard by effective beam width method;(2)Using SAP2000 to numerical simulate the integral shear wall wallboard,the symmetrical coupled shear wall wallboard,the wall-column shear wall wallboard and the asymmetrical coupled shear wall wallboard when the wallboard in the process of the two points demoulding,or the four points hoisting,or the two points vertical hoisting,and according to the results of the calculation to determine the best hoisting mode and the best arrangements of the hoisting points of the different-shape prefabricated concrete wallboard;(3)In the actual project,as for unbalanced forces on the four steel ropes of the prefabricated wallboard in the four points hoisting,making the prefabricated wallboard transformed from 4 points hoisting to 3 points hoisting.And according to the calculation results,the maximum tensile stress of the prefabricated wallboard in the 3 points hoisting is larger than the 2 points hoisting,and the maximum tensile stress of most of the prefabricated wallboard in the 3 points hoisting is larger than 1.43MPa.Therefore,if the prefabricated wallboard could be demoulded by two points,the prefabricated wallboard should try to use 2 points hoisting,and avoid the 4 points hoisting.