International OPEN ACCESS Journal Of Modern Engineering Research (IJMER) | IJMER | ISSN: 2249–6645 | www.ijmer.com | Vol. 4 | Iss. 6| June. 2014 | 26| Investigation of Effects of impact loads on Framed Structures Dhiraj R. Patil 1 , U. R. Awari 2 1 (PG student AISSMSCOE, Pune (India) 2 (Assistant professor, AISSMSCOE, Pune (India) I. Introduction This paper presents method of analysis for the framed structures of steel. The framed structure has the function of protecting important equipments, structures or specific areas from the damage of projectile impact. The affected structural member will undergo large deformation to absorb the energy brought by the projectile, without loss of its own integrity. The effect of an impact force on structure depends on the shape, mass, and velocity of the impacting body; the contact area; the structure’s dynamic response; and the material type, etc. A significant analysis effort is required to evaluate the behavior of a structure under impact loading. To simplify the design, a methodology has been developed using an equivalent static load for a framed structure under impact load. This method has been used in structural design and has demonstrated satisfactory results in meeting design criteria. [1] This paper work deals with behavior of framed structure under impact loading. In beginning there is over all study of Dynamic behavior of frame under Impact load. After that study, by using the analytical methods there is examination of the framed structure. Later by casting the model of frame structure there is experimental study by applying impact loads on it. Here impact load is created by dropping mass from desired height. In this work, impact load is applied on framed structure from certain height and observations are recorded by using FFT Analyzer and accelometer. Such successive readingsrecorded by gradually increasing height and the mass so that, impact will increases. Follow the same work as above for all readings. Finally, experimental and analytical readings are compared to draw conclusion. 1.1 Fast Fourier Transform (FFT) The Fast Fourier Transform (FFT) is the powerful tool for analyzing and measuring signals from plug- in data acquisition devices. By using FFT, you can build a lower cost measurement system and avoid the communication overhead of working with a stand-alone instrument. Plus, you have the flexibility of configuring your measurement processing to meet your needs. To perform FFT-based measurement, however, you must understand the fundamental issues and computations involved. This application note serves the following purposes. 1. Describes some of the basic signal analysis computations. 2. Discusses antialiasing and acquisition front ends for FFT based signal analysis. 3. Explains how to use windows correctly. 4. Explains some computations performed on the spectrum. 5. Shows you how to use FFT-based functions for network measurement. The basic functions for FFT-based signal analysis are the FFT, the Power Spectrum, and the Cross Power Spectrum. Using these functions as building blocks, you can create additional measurement functions such as frequency response, impulse response, coherence, amplitude spectrum, and phase spectrum. [2] 1.2 The Finite Element Method The finite element method (FEM) is the dominant discretization technique in structural mechanics. The basic concept in the physical FEM is the subdivision of the mathematical model into disjoint (non-overlapping) Abstract: This research work consists of a general overview of numerical analysis and dynamic response of framed structures under impact loading. The purpose of the work is to introduce the Finite Element Method which is difficult while analyzing dynamic response to framed structures. Also to introduce the Ansys software and it will also explain and discuss particular model cases subjected to various impact loadings. With these models there will be understanding of the behavior of framed structures showing the clear results of stress, strain and deformation developed throughout the structures. Keywords: Ansys, Deformation, Dynamic Response, Impact Loading, Numerical analysis.