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参照澳洲规范AS/NZS 4600:2005,结合国内实际情况,提出直接基于试验不需经设计公式计算的试件设计指标的确定方法。首先运用概率分析得到表征试验最小值与试验标准值之间关系的修正因子,保证所取标准值具有要求的保证率;进而通过可靠度分析得到一定目标可靠度指标下由所得标准值确定设计值的抗力分项系数。经验证,所推荐抗力分项系数可使基于试验方法确定的设计指标取值在各种荷载组合下的实际可靠指标不小于目标可靠指标。采用已有试验结果进行验证分析,将按规范推荐方法得到的试件承载力设计值与采用所提方法直接由试验结果获得的试件承载力设计值进行比较,结果表明,该法可由样本试件的试验结果合理估计其承载力设计值。最后分析了该方法的使用条件及适用范围,为进一步推广应用提供参考。
With reference to the Australian Standard AS / NZS 4600: 2005, combined with the actual situation in China, a method for determining the design index of the test piece which is not calculated by the design formula directly based on the test is proposed. First of all, using the probability analysis, the correction factor that characterizes the relationship between the minimum test value and the test standard value is obtained to ensure that the standard value has the required guarantee rate. Then, the reliability of the target value is determined by the reliability analysis. The resistance sub-coefficient. It is verified that the recommended partial resistance coefficient allows the actual reliability index of the design indexes determined based on the test method under various load combinations not to be less than the target reliability index. Using the existing test results for verification analysis, comparing the designed value of the specimen carrying capacity obtained from the recommended method with the design value of the bearing capacity obtained directly from the test results using the proposed method, the results show that the method can be tested by sample Test results of a reasonable estimate of the bearing capacity design value. Finally, the method of using the conditions and the scope of application, to provide a reference for further promotion.