The Numerical Simulation Analysis Of Flood Impact On Primary And Secondary School Buildings At Qinling Mountains Area

The flood disaster, the debris flow and the landslide hazard induced by the flood disastercan directly cause casualties and houses collapsed. In a word, the flood disasters cause thegreatest loss of property in a variety of disaster of all. The Southern Shaanxi QinlingMountains areas with heavy and abundant rainfall are prone to flood disaster during the rainyseason. What’s more, the steep areas are more prone to debris flow and other secondarydisasters because of the severely weathered rock and inattentive structure of mountains. Theprimary and secondary schools at the Qinling Mountains mountainous area mainly adoptmasonry structure and mostly build near the river, which are vulnerable to the impact of floodand secondary disasters. The primary and secondary schools are the important publicconstructions, so we investigate the impact of the flood damage mechanism of masonrybuildings to guarantee the safety of primary and secondary schools with significant economicand social benefits.The buildings are caused mainly horizontal impact by flood and secondary disasters. Andthen, domestic and foreign researchers have measured the velocity, acceleration and dynamiccharacteristic parameters, deliberated the motion mechanism based on the Manning formula,and gave the appropriate formula for the impact load. The paper briefly introduces the impacteffect formula, and lists some of the impact load calculations, and analytically investigatesmajor influential factors of the characteristics of the flood and debris flow impact loadavailable for further research.The article selects the typical dormitory substructure as the research object, in theANSYS/LS-DYNA by solid164unit and the no.96composite material model, using of theEROSION failure algorithm, defines failure criteria from two aspects of the stress and strain,simulates and analyses of the masonry structure, masonry structure with measures andmasonry structure strengthened with steel mesh to get impact damage process andcharacteristic. Subsequently, the thesis searchingly studies he destruction mechanism ofmasonry structure. Then, the paper puts forward a kind of method of reinforcement and givesthe relevant reinforcement effect under the comparative analysis.Research indicates that: by the flooding and debris flow impact the dangerous position ofstructure mainly is the bottom of loading wall, the junction of vertical and horizontal wall orconstructional column junction and the bottom of vertical wall; All the masonry structureoverall collapses under the impact load, but construction measures on masonry wall seldomimprove the out-of-plane bending capacity, moreover, it just increase the action of the lateral stiffness in the plane constraint, and has some ductility during the failure process.Reinforcement structure’s loading surface occurred flexural failure, and the bottom oflongitudinal wall appears shear failure, indeed the structure emerges the integral translation.The article also simulated the process of rockfall complicit to building, obtained the minimumcrack and damage velocity, through the failure stress and failure unit number, which cancalculate the corresponding impact force by the impact load calculation formula.This paper studies for "the school safety project" and provides a feasible reference ofprevention and reduction from disaster for primary and secondary schools at mountainousarea.