Experiment and Calculation of Reinforced Concrete at by Zhenhai Guo

By Zhenhai Guo

Concrete as a building fabric is going via either actual and chemical alterations lower than severe increased temperatures. As the most regularly occurring construction fabrics, it can be crucial that either engineers and designers may be able to comprehend and are expecting its habit in lower than severe warmth stipulations. short and readable, this booklet presents the instruments and methods to correctly research the results of extreme temperature of strengthened concrete in an effort to result in extra sturdy, more secure constructions.

Based on years of the author's study, bolstered Concrete at increased Temperatures 4 half remedy starts off with an unambiguous and thorough exposition of the mechanical behaviors of fabrics at increased temperature via a dialogue of Temperature box of member sections, Mechanical behaviors of participants and constructions at increased temperature, finishing with Theoretical research and functional calculation equipment. The booklet offers precise perception into:

  • Coupling thermal-mechanical constitutive relation of concrete
  • Exceptional analyses of beams and columns of oblong part with 3 surfaces and adjoining surfaces exposing to excessive temperature
  • Measurement and research of redistribution of inner forces of statically indeterminate constitution in the course of heating-loading process
  • Finite aspect research and calculation charts for two-dimensional temperature box of structural members
  • Finite aspect research and simplified calculation procedure for strengthened concrete constitution at increased temperature

With this publication, engineers and designers can successfully examine the impact of extreme temperature on concrete and fabrics with a purpose to result in higher designs of fireplace resistant and harm assessment and therapy after fire.

  • Tools and strategies for interpreting the results of hot temperature on concrete and reinforcement materials.
  • Measurement and research of redistribution of inner forces of statically indeterminate constitution in the course of the heating-loading process.
  • Finite aspect research and calculation charts for two-dimensional temperature box of structural members.
  • Finite point research and simplified calculation technique for bolstered concrete constitution at increased temperature.

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Extra resources for Experiment and Calculation of Reinforced Concrete at Elevated Temperatures

Sample text

The compressive strength of concrete (fcuTσ ) under the path of prestressing–heating–loading (σ0–T–σ) is related to the value of the prestress (σ0) and is shown in Fig. 3-7. , CHAPTER 3 Temperature–Stress Paths and Coupling Constitutive Relation of Concrete 42 (a) (c) (b) S –T P 0– T– O O O T T 0 T– 0 M1 T O T1 M2 O T T O T FIGURE 3-6 Various experiments with complicated temperature–stress paths. (a) σ0–T–σ path; (b) T1–σ0–T–σ path; (c) four other paths. 0, where fcu is the lower bound strength corresponding to the path of loading under constant temperature (T–σ).

The locus of the common point. When the specimen is unloaded until its stress is reduced to zero from any point on the envelope and is then reloaded, the intersecting point of the unloading and reloading curves is called the common point. The slope of the reloading curve passes the common point and reduces considerably and the strain increases quickly. This shows that new damage occurs in the interior of the concrete. All the common points of unloading–reloading curves are connected smoothly and the locus of the common point is composed.

CHAPTER 2 Deformation of Concrete at Elevated Temperature where n is a parameter. 5 when T ≥ 700 °C.  2-11(b). Reloading curve Starting from any strain (ɛs) with zero stress, the specimen is reloaded until the reloading curve is tangential to and coincides with the envelope. The tangential point is the end of the reloading curve and its coordinates are (ɛr, σr). The measured ɛs and ɛr from each reloading curve of the specimens are expressed as the relative strains and are drawn in Fig. 17) The end strain ɛr increases monotonically with the starting strain ɛs, but decreases as the testing temperature (T, °C) increases.

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