FIRE RESISTANCE OF CONCRETE-FILLED AND REINFORCED CONCRETE COLUMNS

In order to calculate the fire resistance of a building component, it is necessary to know the temperature history of the component during exposure to fire. In this dissertation a numerical method is described for calculating the temperature field in fire-exposed columns. The procedure is based on a finite difference method for calculating the temperature history of concrete-filled square steel and cylindrical reinforced concrete columns. Two mathematical models and their related computer programs for these columns are presented in this dissertation. Furthermore, the Division of Building Research of the National Research Council of Canada, is now carrying out extensive experimental studies on building columns. These studies include the testing of various columns under fire conditions. The data obtained from these tests will be used to determine the validity of the new models. In order to perform these tests the maximum allowable load must be known. Two mathematical models and their related computer programs to calculate the maximum allowable load of various column cross-sections are also presented in this dissertation

Fuzzy Reasoning for the analysis of risks in geotechnical engineering Application to a French Case

The analysis of risks induced by unstable cliffs is one of the major and important tasks in geotechnieal engineering, This analysis should take into account the fact that some engineering parameters that are necessary for any risk analysts around unstable eliffs are difficult to be quantified and/or they are vague and imprecise. That is why such risk analysis should depend meagerly on the experience of the geotechnical engineer in charge for measurements

Computer Simulation and Risk Analysis around Abandoned Underground Excavations Application to a French Case

International audienceThe Analysis of risks induced by Underground opening or unstable eliffs is one of the major and important tasks in earth science engineering. This analysis should take into account the effect of randomness, it should account also for the probability distributions of different parameters, and above all, the experience of the geotechnical engmeer

Paramètres d'affaissement pour la hierarchisation des zones à risque dans le bassin ferrifère lorrain

International audienceThe consequences of mining collapse on the frame and the infrastructures of surface are directly related to the parameters of subsidence (vertical amplitude, horizontal strain, ..). These parameters are specific to each field even each site. They depend on the nature and the structure of the grounds. In the Lorraine iron-bearing basin, the effects on the surface induced by collapse of mine era by rooms and pillars abandoned are known for 18 cases. The main objective of this research is to determine, by back analysis of subsidence cases due to mining removal of pit props or collapse, the parameters specific to the Lorraine iron-bearing basin in order to use them for the prediction of depressions in zones at the risk of progressive collapse. A comparison of the effects induced by the mining effect with those due to collapses was also carried out. Within the framework of the study, we conform that the cases of subsidence and collapse are very similar. We present, the methodology of back analyzes used to determine subsidence parameters, individually. We describe then, starting from the results obtained, the subsidence parameters of the basin thus determined according to the configuration mining.Les conséquences d'un effondrement minier sur le bâti et les infrastructures de surface sont directement liées aux paramètres d'affaissement (amplitude, déformation...). Ces paramètres sont propres à chaque bassin minier voire chaque site. Ils dépendent de la nature et de la structure des terrains de recouvrement. Dans le bassin ferrifère lorrain, les effets en surface induits par l'effondrement d'exploitations par chambres et piliers abandonnés sont connus pour 18 cas. L'objectif de cette recherche est de déterminer, par le biais d'une rétro-analyse des cas d'affaissements dus à l'exploitation par dépilage ou d'effondrements miniers, les paramètres propres au bassin ferrifère lorrain afin de les utiliser pour la prédiction des affaissements dans des zones à risque d'effondrement progressif". Une comparaison des effets induits par le dépilage à ceux dus aux effondrements a également été réalisée. Dans le cadre de l'étude, nous avons pu exploiter 18 cas d'affaissement ou d'effondrement. Nous présentons, la méthodologie de rétro-analyse utilisée pour déterminer les paramètres d'affaissement, cas par cas. Nous décrivons ensuite, à partir des résultats obtenus, les paramètres de la cuvette d'affaissement ainsi déterminés en fonction de la configuration de l'exploitation

Mineralogy and Chemistry of an Irrigated Tillman-Hollister Soil

Agronom

INFLUENCE OF WATER REGIME TREATMENTS ON GROWTH OF ROSMARINUS OFFICINALIS L. PLANT

The current research was carried out at the Hort. Dept., Fac. of Agric., Benha Univ., Egypt, throughout the 2019/2020 and 2020/2021 seasons. To investigate the impact of water regime i.e. (100, 70 and 50% of field capacity) on growth of Rosmarinus officinalisL. plant in the two seasons. The results revealed that differences treatments of field capacity increased the growth parameters of rosemary plant in the two seasons. The use of field capacity at 100% achieved the highest values on all studied parameters of vegetative growth and some chemical composition, except the total carbohydrates % in both seasons. On contrary, the use of 50% FC scored the best values for total carbohydrates % and essential oil productivity in both seasons. Consequently, it is preferable to treat rosemary plants with FC at 100% in order to achieve the highest levels of vegetative growth parameters. On the other hand, it is possible to treat rosemary plant with 50% FC to obtain the highest essential oil productivity

Experimental verification of column at extreme temperature

Experimental studies have been carried out to predict the fire resistance of protected I-shaped steel insulated with ceramic fibre. The steel section selected were W250-80 and W310-158. The experimental results are compared with those obtained using the mathematical models develop by the same authors. The results indicate that the model is capable of predicting the fire