Research On The Dynamic Response Of The Horizontal Grille Dam With Unbounded Tendons

Debris flows is common natrual disaster, it’s characteristic including short process, sudden, the result of the disaster is very serious and so on. Once the disaster outbreak. People’s life and property is be destroyed. Based on the reasons of debris flows’ outbreak, the most effective measures is engineering control, and horizontal grilled dam is used to intercepted block stone.In this paper via analysis rigid horizontal grilled dam’s shortage, and improving it, firstly come up with setting unbonded tendons in horizontal grilled dam. And the way of modeling in dynamic analysis software ABAQUS is stated, the Element type, materialproperty and contact category is explained, the methods of modeling horizontal grilled dam with unbonded tendons under impact lord is illustrated.Through analysis and comparing the impact force, the displacement, the accelerate and Von-mises stress of horizontal grilled dam with unbonded tendons and horizontal grilled dam with are under same impact load by using ABAQUS. The result shows horizontal grilled dam with unbonded tendons can improve resist impact capability.This can prove the ideaBy changing parameter of horizontal grilled dam with unbonded tendons, concrete strengh, intensity grade of reinforcing steel bar, the initial stress of unbonded tendons and the unbonded tendons of cross sectional area,analysis the dynamic response of horizontal grilled dam with unbonded tendons under different parameters. The main work in this paper is as follows:(1) Put forward a new type of debris flow grille dam with unbonded tendons,and the feasibility of this new type of grid dam is studied. Respectively to numerical simulation calculate grilled dam with unbonded tendonsand ordinary grille dam by the finite element analysis software. Analysis of its dynamic response and final deformation, the grilled dam with unbonded tendons has better performance under same impact load, the feasibility of the new type of dam is better.(2)The grilled dam with unbonded tendons have higher rigidity, the dynamic response of the grilled dam is more obvious influences; the initial stress of unbonded tendons and the unbonded tendons of cross sectional area have no influence to bearing reaction and displacement but them make greater contribution to whole displacement of the dam, the the initial stress of unbonded tendons and the unbonded tendons of cross sectional area bigger, the displacement of dam is smaller..(3)The structual style apply to the real grilled dam by ABAQUS, and the contrast analysis shows the grilled dam with unbonded tendons’ capacity resistance impct load have improve.