1. Journal Articles
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Item Response of circular bridge decks to moving vehicles(1977) Ramakrishnan, R.; Kunukkasseril, V.X.This paper discusses the dynamic response of a curved bridge deck to a moving vehicle. The bridge deck is idealized as a set of annular sector plates and circular rings rigidly jointed together. On the basis of classical plate and ring theories a method has been developed to obtain the response to a moving vehicle idealized as a spring mass system. After obtaining the normal modes and frequencies and establishing the orthogonality conditions, the problem of the forced motion of the deck is solved by the method of spectral representation. Numerical results have been presented to illustrate the effect of several vehicle and bridge parameters on the response. Copyright 1977 John Wiley & Sons, LtdItem Properties of laterite aggregate concrete(1972) Raju, N.K.; Ramakrishnan, R.The paper presents the results of tests conducted on fresh and hardened concrete using laterite as aggregate. Several mixes of laterite aggregate concrete were made with varying watercement and aggregate-cement ratios to study the properties like workability, compressive, flexural, tensile strength and Modulus of elasticity. The tests indicate that the workability decreases with increasing aggregate-water ratio. The compressive strength of laterite aggregate concrete is considerably lower than that of gravel or crushed granite aggregate concrete, while the average ratio of cylinder to cube strength compared favourably with that for normal aggregate concrete, for the range of aggregate and water-cement ratios covered in this investigation. 1972 Secr tariat de R daction.Item Free vibration of stiffened circular bridge decks(1976) Ramakrishnan, R.; Kunukkasseril, V.X.An analytical method for determining the free vibration frequencies of stiffened curved bridge decks is presented. The bridge deck is idealized as a system consisting of a number of concentric annular plate and circular ring segments rigidly connected to each other. From the closed form solutions for free vibration of the individual plate segments and rings, the frequency of the system is obtained by imposing the edge and continuity conditions. Results for several cases are furnished and a comparison with experimental results is also presented. 1976.Item Asymmetric response of circular plates(1974) Ramakrishnan, R.; Kunukkasseril, V.X.This paper deals with the response of thin elastic circular plates to asymmetric loadings. The normal mode method of analysis is used. The transient reponse to an impact force away from the centre and to a concentrated impulse moment at any point are investigated. A comparison of analytical results with those from experimental study of response to an impact force is included. It is considered that the method of analysis developed can be used to determine design stresses. 1974 Academic Press Inc.