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A cantilever beam with a rectangular cross-section under distributed and point loads experiences shearing stresses. The analysis begins by identifying the loads acting on the beam. Then, the reactions at the beam's fixed end are calculated using equilibrium equations. The vertical reaction is a combination of the distributed and point loads, while the moment reaction is the sum of their moments. The shear force distribution along the beam, resulting from these loads, is established by...
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To understand shear on the flat side of a prismatic beam element, consider the vertical and horizontal shearing forces, and the normal forces, acting on the element. The element's upper (U) and lower (L) sections, which are divided by the beam's neutral axis, are examined. The equilibrium of these forces is determined by applying the equilibrium equation, which helps identify the horizontal shearing force. This force is directly related to the bending moments and the cross-section's...
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Evaluation of the Effect of Polyurea Coating Application on the Capacity and Deformability of Reinforced Concrete Beams.

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Flexural Behaviour and Internal Forces Redistribution in LWAC Double-Span Beams.

Ewelina Kołodziejczyk1, Tomasz Waśniewski1

  • 1Department of Concrete Structures, Lodz University of Technology, Politechniki 6, 93-590 Łódź, Poland.

Materials (Basel, Switzerland)
|October 13, 2021
PubMed
Summary

Lightweight aggregate concrete (LWAC) beams show similar strength to normal weight concrete (NWC) beams but have reduced deformability and ductility. This impacts internal force redistribution due to lower ultimate compressive strains in LWAC.

Keywords:
LWACbendingductilitylightweight aggregate concreteredistribution

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Area of Science:

  • Civil Engineering
  • Materials Science
  • Structural Engineering

Background:

  • Lightweight aggregate concrete (LWAC) offers potential benefits in construction, such as reduced dead load.
  • Understanding the structural behavior of LWAC, particularly in reinforced concrete elements, is crucial for its wider application.
  • The interaction between LWAC and steel reinforcement in continuous beams requires detailed investigation.

Purpose of the Study:

  • To compare the structural behavior of continuous beams made with lightweight aggregate concrete (LWAC) versus normal weight concrete (NWC).
  • To analyze the effect of concrete type on flexural capacity, deformability, ductility, and internal force redistribution in double-span beams.
  • To investigate the influence of ultimate compressive strains on the performance of LWAC beams.

Main Methods:

  • Six full-scale, double-span beams with rectangular cross-sections were constructed and tested.
  • Beams were fabricated using both lightweight aggregate concrete (LWAC) and normal weight concrete (NWC) of comparable strength.
  • Experimental data on flexural capacity, deformation, ductility, and moment redistribution were collected and analyzed.

Main Results:

  • LWAC beams demonstrated flexural capacities comparable to NWC beams.
  • Beams made from LWAC exhibited lower deformability and ductility compared to NWC beams.
  • The ultimate compressive strains in LWAC were generally lower than in NWC, leading to reduced rotational capacity and moment redistribution.

Conclusions:

  • LWAC can achieve similar flexural capacities to NWC in continuous beams.
  • The reduced deformability and ductility of LWAC necessitate careful consideration in structural design, especially concerning moment redistribution.
  • The lower ultimate compressive strains in LWAC significantly influence its rotational capacity and the degree of internal force redistribution.