Download e-book for kindle: Basic Principles of Concrete Structures by Xianglin Gu, Xianyu Jin, Yong Zhou
By Xianglin Gu, Xianyu Jin, Yong Zhou
Based at the most up-to-date model of designing codes either for constructions and bridges (GB50010-2010 and JTG D62-2004), this booklet begins from metal and urban fabrics, whose houses are extremely important to the mechanical habit of concrete structural contributors. step-by-step, research of strengthened and prestressed concrete individuals lower than easy loading varieties (tension, compression, flexure, shearing and torsion) and environmental activities are brought. The attribute of the e-book that distinguishes it from different textbooks on concrete constructions is that extra emphasis has been laid at the simple theories of strengthened concrete and the appliance of the elemental theories in layout of recent constructions and research of current buildings. Examples and difficulties in each one bankruptcy are rigorously designed to hide each very important wisdom aspect. As a uncomplicated path for undergraduates majoring in civil engineering, this course is diverse from both the formerly learnt mechanics classes or the layout classes to be learnt. in comparison with mechanics classes, the elemental theories of bolstered concrete constructions can't be exclusively derived through theoretical research. And in comparison with layout classes, this direction emphasizes the advent of simple theories instead of easily being a translation of layout specifications. The booklet will focus on either the theoretical derivations and the engineering practices.
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Extra resources for Basic Principles of Concrete Structures
However, this method is still far from being perfected. The evaluation of existing structures is generally regarded as the inverse process of structural design, and engineers also do it in this way. However, an existing structure as a physical reality has characteristics different from those of a newly designed structure. Firstly, some permanent loads which were treated as random variables in design stage can be considered as determined values in evaluation. Take the commonest permanent load self-weight as an example.
To consider its randomness in the design stage is necessary because it will be influenced by uncertainties in materials and construction. But once the structure has been completed, these uncertainties disappear and the self-weight is objectively determined. , dimensions and material properties) are all statistical variables. However, for existing structures, these parameters are theoretically determined and most of them can be measured. Thirdly, the service history of an existing structure also provides a lot of useful information, such as the maximum load the structure ever sustained and the corresponding performance under this load.
2 Strength and Deformation of Concrete 35 fcu /(N·mm-2) 50 In humid environment 40 In dry environment 30 20 10 0 28d 1 2 4 6 11/year Fig. 13 Changes in cube strength of concrete, fcu with aging The cube strength of concrete will increase with its age. The increase in strength is fast at ﬁrst, but gradually decreases. This process may take several years or even longer for concrete in a humid environment (Fig. 13). The measured strength of concrete should be rectiﬁed if nonstandard cubic specimens are adopted.
Basic Principles of Concrete Structures by Xianglin Gu, Xianyu Jin, Yong Zhou