By Xianglin Gu, Xianyu Jin, Yong Zhou
Based at the newest model of designing codes either for structures and bridges (GB50010-2010 and JTG D62-2004), this publication starts off from metal and urban fabrics, whose homes are vitally important to the mechanical habit of concrete structural individuals. step-by-step, research of bolstered and prestressed concrete participants less than uncomplicated loading varieties (tension, compression, flexure, shearing and torsion) and environmental activities are brought. The attribute of the ebook 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 applying of the fundamental theories in layout of latest buildings and research of latest constructions. Examples and difficulties in every one bankruptcy are conscientiously designed to hide each very important wisdom element. As a easy direction 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 via theoretical research. And in comparison with layout classes, this path emphasizes the advent of easy 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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Additional info for Basic Principles of Concrete Structures
The strength of concrete is also related to the strength grade of cement, the water-to-cement ratio, properties of aggregates, methods of forming, age of concrete, environmental conditions during concrete hardening, dimensions and shapes of specimens, and loading rates. Therefore, all nations have their own standard test methods on strength measurement from concrete specimens under uniaxial loading. For cubic concrete specimens, the faster the loading rate is, the higher the measured strength is.
1 Strength and Deformation of Steel Reinforcement 23 To prevent a plain bar under tension from slipping in concrete, both ends of the bar should be hooked. Sometimes the intermediate segment of reinforcement should be bent due to the design requirement. The detailings of the bent segments and hooks are listed in relevant design codes or acceptance speciﬁcations for construction quality. 3 illustrates some hooks and bent segments in reinforced concrete structures. Hook ends are not necessary for plain bars under compression.
The sands, stones and crystals in cement paste and unhydrated cement grains compose the elastic skeleton of concrete to sustain external loads. Under external loads, the C–S–H gel, micro-voids, and micro-cracks at the interface transition zone between mortar and aggregates make concrete deform plastically. Instinct defects such as voids and initial cracks are generally the origin of concrete failure. The propagation of micro-cracks greatly influences the mechanical properties of concrete. Because it takes several years for cement paste to harden, the strength and deformation of concrete will vary with time.
Basic Principles of Concrete Structures by Xianglin Gu, Xianyu Jin, Yong Zhou