基于温度-应力试验和层次分析法的混凝土抗裂性能综合评价

Evaluation of Anti-cracking Performance for Concrete Based on Temperature-Stress Test and Analytic Hierarchy Process

采用层次分析法对温度-应力试验所得到的各项混凝土抗裂性能评价指标进行综合分析,从而获得它们各自的权重。运用加权求和法计算抗裂性能评价综合指标,并据此全面评判混凝土的抗裂性能。结果发现:对应最大拉应力的温度、最大拉应力、应力储备、最大压应力和拉应力平均增长速率5项主要评价指标的权重值依次为0.362、0.267、0.232、0.083、0.056;抗裂性能评价综合指标值越大,混凝土的抗裂性能越好。考虑各指标权重的抗裂性能评价比基于单一指标的方法更为合理。通过实例验证了基于层次分析法的抗裂性能评价方法具有较好的适用性和可靠性。

The weighted values of anti-cracking performance parameters obtained from temperature-stress test for concrete were calculated via an analytic hierarchy process. The comprehensive index of anti-cracking performance evaluation was determined by a weighted-sum method. The results show that the weighted values of temperature corresponding to peak tensile stress, peak tensile stress, stress reserve, peak compressive stress and average rate of tensile stress are 0.362, 0.267, 0.232, 0.083 and 0.056, respectively. A higher value of the comprehensive index generally gives a better anti-cracking performance. The evaluation of anti-cracking behavior based on the comprehensive index is more rational than that based only on a single parameter. A verification example indicated that the proposed method could be reasonable and practical.