Shear design of civil engineering structures in nuclear power plant under seismic load.

在核电站室外重要的土建混凝土结构中，有许多钢筋混凝土箱形结构，如取水井等，它们由相对细长的墙和板组成，承受着土压力和地震荷载。本文试图对这类钢筋混凝土结构进行研究。本研究的目的在于厘清此类型结构的剪力破坏行为，并发展出一套合理的剪力结构设计方法。本研究的主要结论如下：1.将具有弯矩拐点的钢筋混凝土构件简化为几个简单体系，将均布荷载代入一组集中荷载，采用作者提出的“区域强度方程”，该方法能较好地估计构件的抗剪强度和临界剪切裂缝的位置，称之为“区域强度法”。试验结果证明了区域强度法的适用性.区域强度法虽然适用于各种荷载条件，但在实际设计中有时可能不太方便。本文还提出了用等效集中荷载和等效剪跨长度计算抗剪强度的简化方法，以供实际设计使用。

Among the outdoor important civil engineering concrete structures in nuclear plants, there are many RC box structures such as water intake pits, that are consisted by relatively slender walls and slabs and subjected to earth pressure and seismic load. The author tried to bring this type of RC structures into focus. The purposes of this study are to clarify the shear failure behavior of this type of structures, and to develop a rational design method of the structures against the shear forces. Main conclusions of this study are as follows ;1. Development of a calculating method of shear strengthDlviding the RC member, which has a inflection point of bending moment, into a few simple systems, and substituting the uniformly distributed load into a group of concentrated loads, and then adopting the "Zone strength equation", which has been proposed by the author, shear strength of the RC member and the location of critical shear crack can well be estimated.This method is named "Zone strength method". The adaptability of zone strength method is proved by the experimental results.2. Simplified method for design useThough Zone strength method is expected to be applicable to various loading conditions, it might be sometimes inconvenient in adopting the practical design. A simplified method for calculating the shear strength, using equivalent concentrated loads and equivalent shear span lengths, is also proposed for the practical design use.