JIPKIC 结构设计原理 5,Prestressed concrete structures: The principle of structure design Definition:artificially pre-introducinga stress to concrete to improve the use of concrete in the stress state. Scope:general span>20m advantages and disadvantages: Advantages Disadvantages Use of high strength materials; Complex process and requires Light self-weight; more equipment(difficult design, Bigger span; Calculation and construction). good crack resistance. 5、 Prestressed concrete structures: • Definition: artificially pre-introducing a stress to concrete to improve the use of concrete in the stress state. • Scope: general span> 20 m • advantages and disadvantages: Use of high strength materials; Light self-weight; Bigger span; good crack resistance. Complex process and requires more equipment (difficult design, Calculation and construction). Advantages Disadvantages