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     袁  勇  劉亞芹
    （同濟(jì)大學(xué) 上海 200092）

[提要]  本文討論鋼筋混凝土單排灌注樁為擋土結(jié)構(gòu)的優(yōu)化設(shè)計(jì)。采用朗金土壓力計(jì)算樁的荷載，用等值梁法和矩陣位移法計(jì)算樁的內(nèi)力，并按規(guī)范的方法對(duì)灌注樁、圍檁、內(nèi)撐進(jìn)行設(shè)計(jì)，對(duì)各道支撐進(jìn)行優(yōu)化定位分析。優(yōu)化方法采用懲罰函數(shù)法。優(yōu)化的目標(biāo)函數(shù)為整個(gè)圍護(hù)結(jié)構(gòu)的材料耗費(fèi)。優(yōu)化設(shè)計(jì)結(jié)果表明通過優(yōu)化可節(jié)約總材料5%左右，對(duì)工程設(shè)計(jì)有一定的參考價(jià)值。整個(gè)計(jì)算由相應(yīng)的程序完成，程序分為優(yōu)化、設(shè)計(jì)、繪圖三個(gè)部分。程序在HP-386上運(yùn)行。
[關(guān)鍵詞]  灌注樁 基坑圍護(hù) 結(jié)構(gòu)優(yōu)化

Reinforced concrete pored piles used as enclosuring structure is discussed with concept of structural optimization in this paper. The load on pile stake is calculated by the Rankine's thoery and the stress of pile is calculated with the method of equipollent beam, and pile, tranverse girber and shoring of trench are design according to the code. The place of each vertical strut is decided by method of optimization and the method we select is penalty function.  Object function is the whole cost of structure material. The final result suggests that the cost of material can reduce approximate 5%. We can obtain some benefits if it is use in practice. The whole process includes three parts:optimization, design and drawing. It has been done in HP-386 computer.
keywords: R.C. pored pile, enclosuring structure; structural optimization