近来,关于预应力混凝土桥梁的缺点在新闻宣传甚至在专业刊物中经常报道。这些报道是由于轻信了那些对此类结构很少或根本不了解的人而造成的。众所周知的车辆制造,无须很多介绍的吸引,它们在车间因材料或设计而出现的失败是容易想起来的。但是对于房屋、工厂、 Recently, the shortcomings of prestressed concrete bridges have been frequently reported in public information and even in professional journals. These reports are due to the gullibility of those who have little or no knowledge of such structures. Well-known vehicle manufacturing, without much introduction of attraction, is easy to remember because of material or design failures in the shop floor. But for housing, factories,