Punching shear resistance of column footings and foundation slabs varies significantly in different standards. The reason for this is because standards define differently the position of the critical perimeter in which the punching shear resistance should be determined, and quantify the influences of the main parameters like effective depth, shear slenderness, compressive strength of concrete, longitudinal reinforcement ratio and tension yield stress of reinforcement in different ways. In order to quantify the level of safety in Eurocode 2 and in fib MC 2010, their design results are compared with the test results of the series of footings tested in completely realistic boundary conditions in terms of the subgrade soil. Besides the performed tests results, the analysis of the other investigations of the footing punching rested on the real soil is also included. Thus was obtained the answer to the question how individual characteristics of the footings and of the soil affect the punching bearing resistance and how accurately Eurocode 2 and fib MC 2010 predict the bearing capacity of the tested column footings. At the end, based on the test results and on the tests of others, and on and performed numerical analyses, a possible modification of Eurocode 2 in the field of reinforced concrete footing was proposed.

No abstract

Works in soil requires making of supporting structures to ensure the stability of the field. Reinforced concrete diaphragms allow you to perform the most complex works in a safe manner. The current calculation practice of the effect and movement of diaphragms implied the manual approach to the calculation that requires a serious time commitment of engineers or the use of complex commercial software packages. This paper presents the program automation and acceleration of the process of calculating the effect, movement and rotation of reinforced concrete diaphragms. A software package Cdiaph has been developed, which with the finite difference method calculates and draws diagrams of force impact at the intersection (M and V), movement and rotation of the intersection (x and f) and the recommended depth of foundation (D) of reinforced concrete diaphragms.

No abstract

Within the Construction Design of the Niš-Priština Highway, from the loop road "Merošina" to the settlement Pločnik, among other structures, the construction of the Vršnik Tunnel is also envisaged. The designed tunnel has a total length of 265 m (from km 19+510 to km 19+775) and will be constructed through a rock mass composed mainly of fine-grained gneisses, which belong to the lower complex of crystalline shales. The paper presents and analyses the results of testing the dynamic properties of the rock complexes using geophysical methods, as well as geotechnical classification and categorisation of the rock mass.