Curriculum Vitae for Kristian Hertz - Danmarks Tekniske Universitet
Curriculum Vitae for Kristian Hertz - Danmarks Tekniske Universitet Curriculum Vitae for Kristian Hertz - Danmarks Tekniske Universitet
Curriculum Vitae Kristian Hertz 21 2005-11-14 Research results obtained by Kristian Hertz: Develops an object oriented EDP method for calculation of force distributions in shear walls and plates modelled by two crossing systems of stringers combined by shear membranes. The method can be applied on folded and connected walls and plates and in practise it has proven to be much cheaper and easier to apply than traditional finite element programs. Invents a patented machine capable of utilising the power of sea waves. Creates a set of concepts and a cognitive structure based on the theory of sets and Empiricism. Using this for a logical representation of building design data in a CAD system, and develops a number of versions of an object-oriented program for conceptual modelling for UNIX and Windows with interface to AutoCAD and a separate user interface. Makes the first coherent description of the mechanical and chemical changes of concrete subjected to high temperatures based on a comprehensive literature study of 500 references and 300 test series supplemented by own test results. A new method for testing the bond strengths of variable reinforcing bars in variable concretes and in fire damaged concretes. Finds that the bond strength can be calculated for reinforcement of sufficient corrugation. A calculation model for the anchorage strength of reinforcement as a minimum of the bond strength and a splitting strength, which depends entirely on the cross section. The method gives up to 10-20 times less anchorage lengths than the codes prescribed, and for the first time it offered an explanation to the short anchorage lengths observed to be necessary for slabs in tests and practise. Explains why an effectiveness factor is needed for shear design and how it depends on the cross section. Discovers how concrete specimens can be heated to more than 1000°C in a microwave oven without giving rise to thermal stresses, which until then had spoiled any attempt on finding the mechanical properties of rapid heated concrete. Finds for the first time how the mechanical properties changes for concrete heated rapidly. Develops a fireproof concrete based on Danish raw materials. Finds as the first that high strength concrete densified by micro-silica has an increased risk of explosive spalling, even at slow heating rates. Finds that thermal stresses from hindered thermal expansion can be a precondition for explosive spalling of certain dense concretes. Develops a new test method capable of deciding whether a concrete may have a spalling problem for hindered thermal expansion by means of a standard cylinder. Finds that melamine based superplasticizing additives can give toxic gases like ammonia when heated.
Curriculum Vitae Kristian Hertz 22 2005-11-14 Develops a full set of calculation methods for the plastic load bearing capacity of concrete beams and slabs subjected to moment load, shear and axial load, and for columns and walls. The basic methods are adopted as simplified calculations in the fire chapter of the European CEN code for concrete structures ENV 1992-1-2 and in the Danish code DS411. Develops simple temperature calculation methods as exact solutions to the Fourier equation. Develops a new expression describing fully developed fires for the Danish Action code DS410. Develops a general expression describing deterioration of building materials at high temperatures. Develops design methods for slabs and walls of light aggregate concrete. Develops a new calculation method for assessing a curved lined stress-strain distribution of a concrete cross section subjected to moment load and axial load. The method can be used for calculation of deflections of beams with slack and prestressed reinforcement as well as deflection and stability of cross loaded columns and fits continuously with a plastic design when the cross load varies towards ultimate load, and continuously with the Rankine formula, when the load is varied towards a central column load. In addition the calculations can be made for fire exposure.
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<strong>Curriculum</strong> <strong>Vitae</strong><br />
<strong>Kristian</strong> <strong>Hertz</strong><br />
22<br />
2005-11-14<br />
Develops a full set of calculation methods <strong>for</strong> the plastic load bearing capacity of concrete beams<br />
and slabs subjected to moment load, shear and axial load, and <strong>for</strong> columns and walls. The basic<br />
methods are adopted as simplified calculations in the fire chapter of the European CEN code <strong>for</strong><br />
concrete structures ENV 1992-1-2 and in the Danish code DS411.<br />
Develops simple temperature calculation methods as exact solutions to the Fourier equation.<br />
Develops a new expression describing fully developed fires <strong>for</strong> the Danish Action code DS410.<br />
Develops a general expression describing deterioration of building materials at high<br />
temperatures.<br />
Develops design methods <strong>for</strong> slabs and walls of light aggregate concrete.<br />
Develops a new calculation method <strong>for</strong> assessing a curved lined stress-strain distribution of a<br />
concrete cross section subjected to moment load and axial load. The method can be used <strong>for</strong><br />
calculation of deflections of beams with slack and prestressed rein<strong>for</strong>cement as well as deflection<br />
and stability of cross loaded columns and fits continuously with a plastic design when the cross<br />
load varies towards ultimate load, and continuously with the Rankine <strong>for</strong>mula, when the load is<br />
varied towards a central column load. In addition the calculations can be made <strong>for</strong> fire exposure.
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