拱坝强度设计准则初步研究

本文以二滩拱坝应力分析和混凝土材料特性试验为基础,对拱坝应力分析方法、混凝土强度特性、混凝土试件的比尺效应等进行了仿真研究,并以混凝土微观裂隙起裂点强度作为大坝混凝土的容许使用强度,采用分项系数研究、单项系数表征的方法,建立了拱坝动静荷载作用下的强度设计准则。经若干工程校准计算,准则可信度较高,比传统的经验安全系数设计法更接近实际,可为我国拱坝规范的修订提供重要参考。

Preliminary Study for Strength Design Criteria of Arch Dam

On the basis of stress analysis of Ertan arch dam and concrete characteristicstests, emulation studies are conducted for stress analysis method of arch dam, concretestrength characteristics and concrete specimen scale effect etc; and regarding the strength ofconcrete micro-fissure point as the allowable strength for dam concrete, adopting itemizedcoefficient study and single coefficient attribute, the strength design criteria are establishedunder dynamic and statistic loads of arch dam. After being checked by several engineering,the criteria have a high reliability, and is more close to practice as compared with traditionalexperience safety coefficient desigh. It can provide important references for the modificationof our arch dam specifications.