serviceability limit states meaning in English

正常使用极限状态

Verification of serviceability limit states
正常使用极限状态验证10
Serviceability limit state
正常使用极限状态
Test result suggests , in the serviceability limit states , displacement is littleer , the plane stiffness infinite assumption may be established
实验结果表明，在正常使用极限状态时，位移较小，同一楼层平面内刚度无限大的假定可以成立。
This resonance usually exceeds serviceability limit state and ultimate limit state ; endanger hydropower station ' s economic operation , even safe operation
这种共振往往超出厂房结构的正常使用极限状态和承载能力极限状态，威胁水电站的经济运行乃至安全运行。