symmetric frame meaning in English

对称框架

From this paper ' s study , it had been identified that the pushover analysis method was reliable in scope below : ( a ) low - middle rise , regular , the first model deformable structures , ( b ) short - period structures , ( c ) middle - rise non - symmetric frame structures , ( d ) middle - rise vertical - irregular frame structures , ( e ) middle - rise base - isolated structures , etc . it had also been identified that the time history analysis method could be replaced by the pushover analysis method when the pushover analysis method was reliable
通过本文的研究，证明了pushover法在如下结构中的应用具有足够的准确性：中低层、规则、以第一振型为主要变形特征的结构，短周期结构，多层不对称框架结构，多层竖向不规则框架结构，多层基础隔震结构。同时证明了在pushover法的适用范围内，可以应用简单的pushover法代替复杂的非线性动力时程分析法对结构进行抗震性能评估。