s should clearly state the purpose, brief statement of procedure, results and conclusions. Please include your name, full address and topic on all submissions. At least one author of each abstract should register for the conference. All accepted abstracts will be published as symposium proceedings. Additionally, commended abstracts may be published in a journal after they are expanded to a manuscript followed by extensive reviewing. The language of the conference will be English.

An international symposium

【臨床医学の展望 2012】 呼吸器病学

박응격 저, 「行政學講義」(서울 : 박영사, 1993)

Compressive strength is one of the important property of concrete and depends on many factors. Most of the concrete compressive strength predictive models mainly rely on available literature data, which are too simple to consider all the contributing factors. This study adopted a new approach to predict the compressive strength of sugarcane bagasse ash concrete (SCBAC). A vast amount of data from the literature study and fifteen laboratory tested concrete samples with different dosage of bagasse ash, were respectively used to calibrate and validate the models. The novel Gene Expression Programming, Multiple Linear Regression and Multiple Non-Linear Regression were used to model SCBAC compressive strength. The water cement ratio, bagasse ash percent replacement, quantity of fine and coarse aggregate and cement content were used as an input for models development. Various statistical indicators, i.e., NSE, R2 and RMSE were used to assess the performance of the models. The results indicated a strong correlation between observed and predicted values with NSE and R2 both above 0.8 during calibration and validation for the Gene Expression Programming (GEP). The outcomes from GEP outclassed all the models to predict SCBAC compressive strength. The validity of the model is further verified using data of fifteen tests conducted in the laboratory. Moreover, the cement content in the mix was revealed as the most sensitive parameter followed by water cement ratio form sensitivity analysis. The GEP fulfilled all the criteria for external validity. The simple formulae derived in this study could be used reliably for the prediction of SCBAC compressive strength.

https://www.mdpi.com/2073-4352/10/9/737/pdf

Applications of Gene Expression Programming and Regression Techniques for Estimating Compressive Strength of Bagasse Ash based Concrete

Polypropylene fiber reinforced concrete and its application in creating architectural forms of public spaces

Design and Development of a Testing Device for Experimental Measurements of Foundation Slabs on the Subsoil The paper deals with technical solutions and construction of a testing stand designed for experimental measurements of deformations and state of stress of foundation structures placed on the subsoil. The designed structural system, the analysis of internal forces and the range of maximal loading during experiments are described in detail. The testing stand was constructed in 2010 at the Faculty of Civil Engineering, VSB-TU Ostrava. The testing stand was ready for start of experiments at the end of 2010. Návrh a Vývoj Zkušebního Zarízení pro Experimentální Měření Základových Desek na Podloží Článek pojednává o technickém řešení a výstavbě zkušebního zařízení, tzv. standu, pro experimentální měření přetvoření a napjatosti základových konstrukcí na podloží. Podrobně je popsán navržený konstrukční systém, analýza vnitřních sil a rozsah možného zatížení při experimentálních zkouškách. Výstavba zkušebního standu v areálu Fakulty stavební VŠB-TU Ostrava byla realizována v roce 2010 a v závěru roku bylo zařízení připraveno k zahájení experimentálních zkoušek.

Design and Development of a Testing Device for Experimental Measurements of Foundation Slabs on the Subsoil

Reliability of load-carrying structures has been assessed by various calculation procedures based on probability theory and mathematic statistics, which have been becoming more and more popular. The calculation procedures are well-suited for the design of elements in load-carrying structures with the required level of reliability if at least some input parameters are random and contribute to a qualitatively higher level of the reliability assessment and, in turn, higher safety of those who use the buildings and facilities. This paper discusses application of the original and new probabilistic methods – the Direct Optimized Probabilistic Calculation (“DOProC”), which uses a purely numerical approach without any simulation techniques. This provides more accurate solutions to probabilistic tasks, and, in some cases, to considerably faster completion of computations.

Using DOProC Method in Structural Reliability Assessment

In the paper the experiment results of deformation in foundation slab segment in interaction with subsoil are presented. Pilot measurement is carried out on original subsoil with characteristics which were tested in cooperation with geotechnics specialists. Concrete precast slab with square dimensions 500 mm and with thickness 48 mm made of plain concrete is exposed to vertical load. The tests results are compared with bending moments and deformations analysed according to subsoil models given in Eurocodes using FEM analysis.

Foundation Slab in Interaction with Subsoil

Fiber-reinforced concrete has a wide application in practice, and many fields of research are devoted to it In most cases, this is a specific problem, ie, the determination of the mechanical properties or the test method However, wider knowledge of the effect of fiber in concrete is unavailable or insufficient for selected test series that cannot be compared This article deals with the processing of a comprehensive test study and the impact of two types of fibers on the quantitative and qualitative parameters of concrete Testing was performed for fiber dosages of 0, 40, 75, and 110 kg/m3 The fibers were hooked and straight The influence of the fibers on the mechanical properties in fiber-reinforced concrete was analyzed by functional dependence The selected mechanical properties were compressive strength, splitting tensile strength, bending tensile strength, and fracture energy The results also include the resulting load–displacement diagrams and summary recommendations for the structural use and design of fiber-reinforced concrete structures The shear resistance of reinforced concrete beams with hooked fibers was also verified by tests

Determination of Mechanical Characteristics for Fiber-Reinforced Concrete with Straight and Hooked Fibers

The article handles potential approaches to design and determination of total load capacity of foundation slabs and floors. The research is focused on punching shear failure of reinforced ground supported slab. The article presents detailed results of the experiment made and advanced numerical modelling based on nonlinear analysis and application of fracture-plastic model. The experiment made included a 2.0 × 1.95 m reinforced concrete slab-on-ground of 120 mm thickness. The experiment was followed by a parametric study of total load capacity calculation with nonlinear analysis which is supplemented by calculations based on existing design model code.

/pdf/punching-shear-failure-of-concrete-ground-supported-slab-218e87sjmw.pdf

Radim Čajka

Papers

Design and Development of a Testing Device for Experimental Measurements of Foundation Slabs on the Subsoil

Using DOProC Method in Structural Reliability Assessment

Foundation Slab in Interaction with Subsoil

Determination of Mechanical Characteristics for Fiber-Reinforced Concrete with Straight and Hooked Fibers

Punching Shear Failure of Concrete Ground Supported Slab