新老混凝土粘结的抗压强度塑性极限分析

Extreme Plasticity Analysis of Compressive Strength for New and Old Concrete

对新老混凝土粘结试块进行了抗压强度研究,发现新老混凝土粘结在竖向受压情况下,其抗压强度远低于整浇混凝土的抗压强度.因此,对新老混凝土粘结试块的竖向抗压强度进行相关理论分析,并根据试验,提出了新老混凝土粘结的受压破坏机构;又利用塑性极限分析中的上限定理,得到了新老混凝土粘结抗压强度的理论解.对比理论解与试验值,发现理论解高于试验值,在详细分析原因后,对理论解进行了相应修正.

This paper presents the failure mechanism of compression for new and old concrete based on the test results.Using the upper bound theorem of plastic limit analysis,the theoretical solution for compressive bond strength for new and old concrete is deduced.By comparing the theoretical solution with the test result,it is found that the value of the former turns out to be greater the latter.The reasons of the disparity are analyzed,in which the theoretical solution is modified by taking the test results into the consideration.