Study On Design Method And Numerical Simulation Of Corrugated Steel Diaphragm Of Tilt-up Building System

Logistics industry in China has developed rapidly in recent years,and the domestic demand for industrial buildings such as logistics warehousing is increasing.Tilt-up building system,which is widely applied in North America,also has a good application prospect in China.Diaphragm as an important component of Tilt-up building system,the study of its design method and seismic performance is helpful to the development of Tilt-up building system in China.In this paper,ABAQUS is used to simulate the test made by scholar Essa.The test specimen is a scaled cantilever corrugated steel plate diaphragm.Then the cantilever constraint form of the corrugated steel diaphragm model is adjusted to the simply supported constraint form,and the effects of different screw spacing and corrugated plate thickness on the in-plane mechanical properties of the specimens are studied by low cyclic loading.In addition,this paper also summarizes the relevant Tilt-up building system diaphragm seismic design methods in ASCE7,IBC and other American codes,designs a single-story Tilt-up storage building in the actual project,and does the elastic-plastic time-history analysis to the actual project of the design.The simulated structural period is reasonable,and the interlayer displacement angle is less than the limit value given by the specification,and the base shear force satisfies the requirements of the code for the wall to bear most of the shear force,indicating that design method is reasonable.Finally,in order to explore the influence of different diaphragm aspect ratio and diaphragm structure layout on the mechanical performance of Tilt-up storage buildings,ABAQUS is used to do push-over simulation analysis of three Tilt-up storage building models.Through the above research,the following conclusions can be drawn:(1)When the screw spacing of the specimen is constant,the thickness of corrugated steel plate increases,or when the thickness of corrugated steel plate is constant,the screw spacing decreases,the bearing capacity of the specimen shows a obvious upward trend,the initial stiffness is improved,and the dissipated energy is gradually increased.Among the simulated specimens made in this paper,the performance of the corrugated steel diaphragm with the thickest corrugated steel plate and the smallest screw spacing is the best.(2)The corrugated steel diaphragm with too close screw spacing and thin corrugated steel plate is not recommended,the combination will cause excessive structural damage and rapid damage.(3)In the Tilt-up storage building model,the Tilt-up storage building with a diaphragm aspect ratio of 1:1 is mainly shear-resistant compared with the building with a diaphragm aspect ratio of 2:1,the building with a diaphragm aspect ratio of 1:1 has good bearing capacity,good ductility,uniform stress distribution of the diaphragm,and the structure is not easy to be locally damaged,and its mechanical performance is better than the diaphragm aspect ratio of2:1.(4)The Tilt-up storage building with corrugated steel plate laid along the short side has higher ultimate bearing capacity and initial stiffness,but poor ductility;The ultimate bearing capacity and initial stiffness of Tilt-up storage building laid with corrugated steel plates along the long side of the diaphragm are lower,but the ductility is good,which provides a reference for different design conditions.