The surrealistic writing techniques,such as the random-seeming collages of different materials and the recording of hallucination,are adopted in the poems of Genesis Poetic Group so that the pourer of imagination plays a more active role in their poems than in those by the Modern Poetic Group and the Blue Star Poetic Group,and the images in their poems are richer and more original as well.

The alternative defensive ability of structures refers to their ability to adjust the internal forces automatically to avoid the continuation of damage and maintain the whole structure stability when local members failed unexpectedly due to abnormal events or severe local overloading.

In this paper,according to the distribution characters of dead and live load,as well as the character of abnormal event,the load effect combination applying to the analysis of alternative defensive ability is deduced on the base of probability theory and structural reliability.