Vehicle excitation by passing over pavement unevenness represents the actual problem which is solved on many departments in this time. The numerical methods are mainly applied for the solutions of the interaction of similar systems. The Finite Element Method (FEM) is the best-known and widely used. It provides appropriate accuracy. In this article, commercial computer software ADINA based on the FEM is used to solve kinematic excitation of vehicle. The 2D model of vehicle which represents real type of lorry T-815 is excited by simulation of passage across obstacle. There are compared dynamic responses of the vehicle on the kinematic excitation at different speeds.
Foam concrete (FC) is little used material in construction practice and it has very good potential for utilization in the civil engineering and building construction. Nowadays, it is primarily used as a leveling layer in the floor of the buildings, but its utilizability is much wider because of its particular properties. Its main characteristics are its material property and that it consists of void pores. This allows to achieve the low bulk density and saving of material inputs. As a building material, it has adequate mechanical characteristics and low thermal conductivity. A series of dynamic testing using light weight deflectometer (LWD) was carried out to estimate the reliable value of the dynamic deformation modulus that can represent the quality of the sub-base made from foam concrete beside the bulk density investigation. Static strain moduli from the second load cycle is the common required value for the sub-base design. Due to larger stiffness and thus larger deflection radius, conventional PLT apparatus is not suitable for foam concrete testing. On the other hand, when adequate dynamic modulus based on the conventional strain modulus is determined, LWD testing is quick method for the foam concrete testing. This paper presents the first attempts to estimate this relation.
Dynamic test methods are used in numerous civil engineering sections. Evaluation of the earthwork quality can be carried out effectively using these methods. Equipment utilized the dynamic methods, such as Clegg Impact Soil Tester, is portable and usable in cramped areas or difficult accessible places. Another benefit is that these apparatuses can be used for quick controlling of the subsoil layers during the subsoil improvement. Clegg Impact Soil Tester can substitute the common test equipment in terms of the earthworks assessment. However, boundary conditions of apparatus given by the manufacturer need to be taken into account to obtain results with sufficient reliability. Method is based on the impact effect of the test equipment on the ground. Thus, results have to be interpreted carefully considering the type and the physical state of the tested soil.
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