混凝土局部受压的三个基本问题

为了解决混凝土核心面积对局压承载力的影响、计算底面积重叠的密布预应力束锚具下混凝土局部受压承载力计算和预应力混凝土构件端部锚固区三类间接钢筋的计算与配置这三个目前局部受压研究中亟待解决的问题,开展了理论分析和试验研究.结果表明:核心面积对局压承载力影响显著,局压承载力随着核心面积的增大而增大;密布预应力束锚具下混凝土局压承载力应按整体计算;预应力混凝土构件端部的三类间接钢筋可分别计算,协调配置.基于研究成果,提出了相应问题的解决办法.

Research on three fundamental problems in concrete local compression

The three problems need to be solved in present research of local compression, such as influence of the concrete core area on the local compression bearing capacity, calculation of the local compression bearing capacity of concrete under closely spaced anchorages with overlapping calculated bottom area and calculation and placing of the three kinds of indirect reinforcement in end zone of prestressed concrete structure. Theoretical analysis and experimental research show that the core area have notable influence on the local compression bearing capacity and the local compression bearing capacity increases with the increase of the core area. The local compression bearing capacity of concrete under closely spaced anchorages should be calculated integrally. The three kinds of indirect reinforcement in end zone of prestressed concrete structure can be calculated separately and be placed harmoniously. Based on the research results, the relevant solving methods are brought forward. All these can be served as references for making further researches on local compression and perfecting calculation methods for the local compression.