This volume focuses on the origin, transmission, and types of elastic waves in solid media, covering the physical laws involved in wave analysis and the mathematical methods for analyzing wave phenomena. 1971 edition.

Focusing on the fundamentals of structural dynamics required for earthquake blast resistant design, Structural Dynamics in Earthquake and Blast Resistant Design initiates a new approach of blending a little theory with a little practical design in order to bridge this unfriendly gap, thus making the book more structural engineer-friendly. This is attempted by introducing the equations of motion followed by free and forced vibrations of SDF and MDF systems, D’Alembert’s principle, Duhammel’s integral, relevant impulse, pulse and sinusoidal inputs, and, most importantly, support motion and triangular pulse input required in earthquake and blast resistant designs, respectively. Responses of multistorey buildings subjected to earthquake ground motion by a well-known mode superposition technique are explained. Examples of real-size structures as they are being designed and constructed using the popular ETABS and STAAD are shown. Problems encountered in such designs while following the relevant codes of practice like IS 1893 2016 due to architectural constraints are highlighted. A very difficult constraint is in avoiding torsional modes in fundamental and first three modes, the inability to get enough mass participation, and several others. In blast resistant design the constraint is to model the blast effects on basement storeys (below ground level). The problem is in obtaining the attenuation due to the soil. Examples of inelastic hysteretic systems where top soft storey plays an important role in expending the input energy, provided it is not below a stiffer storey (as also required by IS 1893 2016), and inelastic torsional response of structures asymmetric in plan are illustrated in great detail. In both cases the concept of ductility is explained in detail. Results of response spectrum analyses of tall buildings asymmetric in plan constructed in Bengaluru using ETABS are mentioned. Application of capacity spectrum is explained and illustrated using ETABS for a tall building. Research output of retrofitting techniques is mentioned. Response spectrum analysis using PYTHON is illustrated with the hope that it could be a less expensive approach as it is an open source code. A new approach of creating a fictitious (imaginary) boundary to obtain blast loads on below-ground structures devised by the author is presented with an example. Aimed at senior undergraduates and graduates in civil engineering, earthquake engineering and structural engineering, this book: Explains in a simple manner the fundamentals of structural dynamics pertaining to earthquake and blast resistant design Illustrates seismic resistant designs such as ductile design philosophy and limit state design with the use of capacity spectrum Discusses frequency domain analysis and Laplace transform approach in detail Explains solutions of building frames using software like ETABS and STAAD Covers numerical simulation using a well-known open source tool PYTHON

This major textbook provides comprehensive coverage of the analytical tools required to determine the dynamic response of structures. The topics covered include: formulation of the equations of motion for single- as well as multi-degree-of-freedom discrete systems using the principles of both vector mechanics and analytical mechanics; free vibration response; determination of frequencies and mode shapes; forced vibration response to harmonic and general forcing functions; dynamic analysis of continuous systems;and wave propagation analysis. The key assets of the book include comprehensive coverage of both the traditional and state-of-the-art numerical techniques of response analysis, such as the analysis by numerical integration of the equations of motion and analysis through frequency domain. The large number of illustrative examples and exercise problems are of great assistance in improving clarity and enhancing reader comprehension. The text aims to benefit students and engineers in the civil, mechanical and aerospace sectors.

Contents: Aspects of Vibration Control Support Design; Response of a Hardening Spring Oscillator to Random Excitation; Non-Linear Dynamic Response of a Multi-Mass System with Gaps; An Improved Derivation of the Dunkerley-Mikhlin Formula; Advances in Failure Analysis by Statistical Techniques (FAST); On the Mean Life Evaluation of a Material with Ideal Elasto-plastic Behavior, Subjected to a Stochastic Loading Programme with a Finite Number of Strain Levels; Fatigue Analysis of Multi-Degree-of-Freedom Systems under Random Vibration; A Mathematical Model for the Stress and Vibrational Analysis of the Human Mitral Valve; Decrement in Visual Acuity Related to Vibration of Shaker, Seat, and Observer's Head; Free Vibrations of Unsymmetrically Laminated Cantilevered Composite Panels; Fundamental Frequencies of Orthotropic Plates with Various Planforms and Edge Conditions; Dynamic Response of Laminated Composite Plates under Residual Thermal Stresses; Vibration of Composite Plates of Arbitrary Shape by the Method of Constant Deflection Lines; Coupled Vibrations of Turbomachine Blades; and Acceleration through Resonance of Multi-Degree of Freedom Systems.