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对国外规范ACI 318-11,AASHTO LRFD 2012和FIP 1999中关于撑杆-拉杆模型的规定进行了比较,吸收了国外规范的合理建议,推荐了一个更为合理的撑杆-拉杆模型。收集了165个深梁和121个四桩承台试验数据,对所有试验数据均按不同规范的建议方法、推荐的模型方法进行试验承载力和理论承载力的比较。比较表明,推荐的撑杆-拉杆模型方法的计算结果具有更为合适的安全储备和较小的变异系数。通过两个设计实例,验证了推荐的撑杆-拉杆模型方法是简单可操作的,且结果是合理的。
Compared with the norms of strut-strut models in foreign norms ACI 318-11, AASHTO LRFD 2012 and FIP 1999, the reasonable proposals of foreign norms were absorbed and a more reasonable strut-strut model was recommended. The data of 165 deep beams and 121 four-pile caps were collected. All the test data were compared according to the proposed method and the recommended model method for the test bearing capacity and the theoretical bearing capacity. The comparison shows that the proposed method of strut-rod model has a more suitable safety reserve and a smaller coefficient of variation. Through two design examples, it is verified that the proposed method of strut-rod model is simple and feasible and the result is reasonable.