JIPlKIC 结构设计原理 The principle of structure design Serviceability limit state Auto load impact factor should be neglected,the role (or load)effects should be short-term effects and long-term effects of access to one or several combinations.Short-term effects of combination is a permanent role(structural weight)and variablestandard values of the role of the combination effect of frequent value;long-term effectscompared to the permanent role of the standard combination of value and the role ofquasi- permanent value of a variable combination of effects ➢ Serviceability limit state ：Auto load impact factor should be neglected, the role (or load) effects should be short-term effects and long-term effects of access to one or several combinations. Short-term effects of combination is a permanent role (structural weight) and variablestandard values ​of the role of the combination effect of frequent value; long-term effectscompared to the permanent role of the standard combination of value and the role ofquasi￾permanent value of a variable combination of effects