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王新堂 （寧波大學(xué)建筑工程與環(huán)境學(xué)院 寧波 315 211）
[提要] 基于拉索式平面預(yù)應(yīng)力鋼桁架的計算模型，建立了拉索式平面預(yù)應(yīng)力鋼桁架優(yōu)化設(shè)計方法。利用該方法分別對工程中常見的三種不同的拉索式預(yù)應(yīng)力平行弦鋼桁架進(jìn)行了優(yōu)化分析，并對結(jié)構(gòu)方案進(jìn)行了比較。在此基礎(chǔ)上，通過大量計算進(jìn)一步討論了這種結(jié)構(gòu)的整體剛度條件、外荷載與鋼索預(yù)拉力、所需鋼索截面面積及總用鋼量等因素間的內(nèi)在關(guān)系（由一組曲線表示），為拉索式預(yù)應(yīng)力鋼桁架結(jié)構(gòu)方案的選取和設(shè)計提供了一種新的途徑。
[關(guān)鍵詞] 拉索式預(yù)應(yīng)力 平行弦鋼桁架 優(yōu)化設(shè)計 方案討論On the basis of the computational model of the cable-prestressed planar steel trusses, the methods for optimum design of the structure are further put forward. Using the method presented here, optimization are made for three type of different structures of the planar prestressed steel trusses with parallel cords, and some comparison are made for the structure plans.The relations of the factors such as the stiffness condition of the whole structure, external loads, the pretension of the steel cables, the needed areas of the cables and the total steel consumption are studied through a large amount of calculations, and expressed as a set of curves, which provide a new way for plan choosing and design of the planar prestressed steel trusses.
Keywords: cable-prestressed planar steel truss; parallel cords; optimum design; plan discussion
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