等倍数 meaning in English

equimultiple

Several ways of stability appraisal exist : ( a ) reduce shear strength method ; its reduces shear strength parameters ( c and ) of the materials ( b ) overload method , it increases all loads gradually from minimum to maximum level as times progresses until failure occurs
稳定分析时采用： ( a )强度储备法，即等倍数地降低材料的强度参数( c和) ； ( b )超载法，即等倍数地将荷载由小到大逐步增加，直到破坏产生。