According to data collected in experiments, freeze-thaw effect on strength and deformation of four different strength grade concretes were analyzed.

通过对试验数据的整理，分析了冻融循环次数对四个强度等级混凝土的强度和变形的影响。

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Some technical methods are used to make construction convenient when different strength grade concrete is used in the joint of beam and column in high building.

介绍了高层建筑中 ，在钢筋混凝土框架结构的梁柱节点处 ，混凝土强度等级不同 ，为了方便施工 ，所采取的技术措施。

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Based on design criterion and construction practice, the paper presented the method to treat beam - column node concrete with different strength grade in course of design and construction.

在设计规范与工程实践的基础上，着重论述了梁柱节点不同混凝土强度等级在设计和施工中的处理方法。

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