带覆土预应力混凝土梁抗冲击试验

Experimental study on anti-impact properties of a partially prestressed concrete beam with covering soil

通过在跨中施加落锤冲击荷载的方法,研究了3根带覆土无粘结部分预应力混凝土梁的抗冲击性能,给出了典型的实测波形曲线,得到无粘结部分预应力混凝土试验梁在落锤冲击荷载作用下的动力特性和极限承载能力,分析了落锤重力势能及少量覆土对预应力混凝土梁动力性能的影响,并根据相似模拟理论,得出了与试验梁相似的12 m跨度的实际无粘结部分预应力混凝土梁的极限抗冲击承载能力.结果表明:带少量覆土无粘结部分预应力混凝土试验梁具有很好的抗冲击性能,不会发生脆性破坏,可用于大跨度地下结构.

The dynamic properties and untimate load-carrying capability of three partially unbonded prestressed concrete beams with covering soil, were experimentally obtained by applying impact load to their middle with dropping hammers, and the typical measurement wave curves were given. Influences of a dropping hammerrs gravitational potential energy and covering soil on the dynamic properties of the prestressed concrete beams were analyzed. On the basis of analog simulation theory, the impact-load carrying capability of the real unbonded prestressed concrete beams with span 12 m was gained. Results show that the unbonded prestressed concrete beam＇s anti-impact properities are good, the fragile destruction will not happen, and the unbonded prestressed concrete beams can be used in wide span underground structures.