Response of the Flat Reinforced Concrete Floor Slab with Openings under Cyclic In-Plane Loading

The responses of flat reinforced concrete (RC) floor slabs with openings subjected to horizontal in-plane cyclic loads in addition to vertical service loads were investigated using nonlinear finite element analysis (FEA). A finite element model (FEM) was designed to perform a parametric analysis. The effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. The research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. The inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. The flat RC floor slab with a circular opening shape has increased efficiency. The placement of the openings is more desirable by positioning the openings at the intersection of two-column strips.

Cause Analysis and Influence Evaluation of Cracks in Thick Slab Construction

Cracks were found in the slab of a nuclear power plant when the formwork was removed. By means of ultrasonic testing, water storage test and crack width detection, the fracture distribution, depth and width characteristics are determined. On this basis, the numerical simulation analysis of hydration heat in the maintenance process is carried out to simulate the possible crack generation and distribution of the floor slab in the maintenance process. The simulation result shows that cracks under the combined action of temperature and shrinkage are consistent with the cracking characteristics of floor slab. Through numerical simulation of the cracked floor and intact floor, the change of the out of plane bearing capacity (bending and shear) of the cracked floor is compared and analyzed. In the model, considering the reduction of the bearing capacity at the crack section and the change of load transfer effect at the crack interface, the concrete model is disconnected according to the known opening situation, and the contact relationship is set on the crack interface to simulate the crack. Through comparative analysis, the mechanical properties of the cracked floor are evaluated, and the refined numerical simulation method of the working components with cracks is proposed. This paper can provide guidance for the cause analysis and influence evaluation of similar thick plate cracking phenomenon.

Analisis Pelat Lantai Menggunakan Metode Hirzfeld

At this time construction of the royal house is growing very fast at Batam City. The matter proves that are people's construction is successfully for planning the building at Batam City. Floor Slab Analysis with Hirzfeld Method done for knowing the main deflection coefficient and flexible moment of the floor slabs with different dimensions are have different four cases. After analyzed then, obtain results that are the higher dimension of the floor slab then obtain the higher deflection coefficient and flexible moment also.

The Possibility of Using the Ultra-Thin Liquid Thermal Insulation to Insulate the Ceiling above the Basement in Residential Buildings

The issues of energy saving, as well as comfortable operation of buildings in modern construction practice are relevant. The experience of operation of the premises, located above the basement, shows that the most common problem is the cooling of the floor slab and, as a consequence, the presence of a cold floor. The article presents the results of calculations on the change of thermal properties of the ceiling above the basement in residential buildings. A variant of insulation of the ceiling with ultra-thin liquid insulation is proposed. The graphical analysis of the problem is carried. As a result of graphical analysis, it was revealed that the proposed method of insulation makes it possible to increase the floor temperature in the rooms of the ground floor in the residential buildings.

Experimental and Numerical Study on the Flexural Performance of Assembled Steel-Wood Composite Slab

This paper presents research on a new type of fabricated steel–wood composite floor material in the style of a slab-embedded beam flange, using test methods and finite element numerical analysis to study the flexural load-bearing performance of the composite slabs. Through experimental phenomena, the failure process and mechanism of the composite floor are analyzed, and the deformation performance and ultimate bearing capacity of the composite floor material are assessed. Through numerical analysis of the finite element model, the influence of the connection mode of the floor and the composite beam, the type and number of connectors, and the width of the flange of the composite beam on the bending performance of the composite beam–slab system is studied. The research results show that the fabricated steel–wood composite floor slab has good load-bearing and deformation performance. The self-tapping screw connection of the floor slab is better than the ordinary steel nail connection, and the reasonable screw spacing is 100–150 mm. Increasing the flange width of the composite beam can significantly improve the load-bearing capacity of the steel–wood composite floor component.