结构设计荷载的错误对结构可靠性影响研究

Research on Design Structural Reliability Influenced by Design Load Error

结构设计荷载错误是结构设计中出现的人为错误之一,结构设计人为错误会对结构可靠性产生不利影响。设计荷载取错的结果是建筑物结构抗力与期望抗力不符。通过引入抗力修正系数来分析设计错误结构的可靠度,推导出设计正、误两种失效概率间的关系式。文章分别从构件和结构层次推导了荷载取错对结构可靠性影响的公式,并分别给出对结构可靠性影响的敏感性分析图,直观表述出各因素对可靠度影响的敏感程度。算例研究计算出荷载取错导致结构可靠度减小的大小,表明本研究具有工程应用价值。

The wrong load is one in errors of the structural design. The wrong structural design will change the structural reliability. The result is the resistance will not match the expectations. By the introduction of resistance correction factors to analyze the reliability of the wrong design structure, the relations of the failure probability of wrong and correct design is derived. The formulas of structural reliability were deduced considering load errors from the two points of structural member and structural system. We showed the sensitivity analysis drawings affected by human errors. From the drawings, the trends affected by the factors can be read directly. The examples considering load errors as studied and the decrement of structural reliability of the examples was worked out. This research has good engineering value.