( d ) the structure in 8 . 5 region demonstrates a favorable response under earthquake action and forms a well energy - consuming mechanism 8度半框架在地震作用下结构总体反应表现良好，形成了以梁端塑性铰为主的耗能机构。
2.
( c ) there are no plastic hinges in frames of 7 . 5 regions by intermediate earthquake action . and favorable general seismic capacity behaves in rare earthquake action . the whole structure forms a relatively exhaustive " beam - hinges plastic mechanism " 7度半框架在设防烈度地震作用下结构各个杆件均未出铰；在罕遇地震作用下仍然表现出了良好的总体抗震性能，整个结构形成了较为彻底的“梁铰机构” 。
