The interface between new and old concrete is often weak.
新老混凝土界面往往是混凝土结构的薄弱界面。
The concrete structure is weak in counter crack, and the crack is common.
混凝土结构抗裂性能差，开裂现象比较普遍。
For weak bracing system, this paper provided the concrete formula...
对弱支撑体系，提出了柱子计算长度的实用计算公式。
For weak bracing system, this paper provided the concrete formula...
对弱支撑体系，提出了柱子计算长度的实用计算公式。
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