Research Of Numerical Simulation On Responses Of Structure To Blasting Vibration

With the wide use of blasting technique, more and more people have concerned the effects of blasting vibration. In order to reduce the harm of blasting vibration and ensure the work will go smoothly, a model to predict the structural vibration response by an actual blasting vibration field is built in this paper.On the basis of actual blasting vibration field, this paper proposes the method, which can predict the response of the structure to the blasting vibration according to the blasting vibration stimulation and parameters of the structure. This paper applies the newest theory of structure vibration, and then discusses the response of the structure in different blasting vibration under outer stimulation. According to these, that the method of the response of structure under blasting vibration stimulation can be worked out by using the method of how to work out the system frequency response function (Transfer function) with numerical value is proposed in this paper. Because the method of structure vibration which based on syntony stimulation and blasting vibration is not a simple one, in order to decompose the syntony stimulation of blasting vibration, Fourier Transform of blasting vibration is introduced at first. Then how to work out the frequency response function of various blasting system is particularly introduced. At last, the process and method of structure response under blasting vibration stimulation by using frequency response function are explained. The method is as follows, at first, to calculate the frequency response function of structure corresponding every blasting syntony ponderance, then to calculate the response of structure under this syntony ponderance by using frequency response function, at last, the response of the whole system can be worked out by superposition.Because different structural system takes on different mechanical form, a blasting system model based on upside structure, rigid base and boundless foundation is built in this paper, and then method of calculating the response under blasting vibration stimulation in this model is discussed. Suppose blasting vibration stimulation acts onthe foundation of structure at first, then upside structure is affected by blasting under mutual action of foundation and upside structure. In this paper, the actual displacement of the structure foundation under blasting vibration stimulation is calculated at first, then, the response of structure by the displacement can be worked out.At last, according to the model built in this paper, this paper applies it in the practice, such as the structure of dam and chimney. The FEM analytical software of ANSYS company桝nsys is adopted in the whole calculation. The results show that the method and model can simulate the response of this kind of structure in blasting vibration. The method and model is reliable, so it can be applied in the practice.