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（寧波市建筑設(shè)計(jì)研究院  315012）
【提要】  分析了目前常見(jiàn)的兩種計(jì)算基坑支撐剛度方法的差異、優(yōu)缺點(diǎn)和適用范圍。通過(guò)建模，用彈性支點(diǎn)法分別計(jì)算分析了單道支撐和兩道支撐條件下，支撐剛度變化對(duì)支撐軸力及支護(hù)樁樁身內(nèi)力的影響。計(jì)算結(jié)果表明：對(duì)于單層支撐系統(tǒng)，隨著支撐剛度的增大，支護(hù)樁的最大彎矩和剪力稍有增加，而支撐軸力的增大幅度比較明顯，且當(dāng)支撐剛度增大到臨界值后軸力趨于穩(wěn)定；對(duì)于雙層支撐系統(tǒng)，增加支撐剛度對(duì)支撐軸力起到增大
的作用，但對(duì)支護(hù)樁內(nèi)力的影響卻各不相同。
【關(guān)鍵詞】  基坑  支撐剛度  支護(hù)樁  內(nèi)力
Calculating Methods for Stiffness of Bracing Structure and Their Influence on Internal Force of Retaining Piles/Xu Yang, He Libo, Xu Guoping, Wu Zhehua(Ningbo Architectural Design & Research Institute,Ningbo 315012,China)
Abstract:The difference of two calculating methods for stiffness of bracing structure are compared. The model for analyzing stiffness of bracing structure influence upo
n internal force of retaining pile is established, and some useful conclusions are obtained. The force of bracing structure becomes bigger with the increasing of its stiffness. For monolayer and twodouble bracing structure, the change of moment of retaining piles is different with the increasing of stiffness of bracing structure.
Keywords:foundation pit; stiffness; bracing structure; retaining piles; internal force