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(悉地（北京）國際設(shè)計(jì)顧問有限公司， 上海 200235)
［摘要］考慮基礎(chǔ)剛度的影響對超長結(jié)構(gòu)的溫度作用分析非常關(guān)鍵，基礎(chǔ)剛度宜以實(shí)測剛度為依據(jù)，進(jìn)行合理取值。以某大型步行天橋的溫度作用分析為例，根據(jù)樁的水平和豎向靜載試驗(yàn)，推算了基礎(chǔ)的實(shí)際剛度，并全面比較了固定支座約束、線性彈簧支座約束、非線性彈簧支座約束時結(jié)構(gòu)的內(nèi)力狀態(tài)。結(jié)果表明，固定支座約束過分限制了類似核心筒這樣剛度很大的構(gòu)件的變形，改變了結(jié)構(gòu)的溫度內(nèi)力分布狀態(tài)，與實(shí)際情況有很大偏差。討論了基礎(chǔ)剛度取值中一些假定的局限性，對基礎(chǔ)剛度的合理取值給出具體建議。
［關(guān)鍵詞］超長結(jié)構(gòu); 基礎(chǔ)剛度; 溫度作用; 水平剛度; 豎向剛度; 樁基
中圖分類號：TU318.1，TU398.1 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)12-0044-04
Effect of foundation stiffness on temperature analysis of a pedestrian bridge
Yang Bifeng, Zhang Yu, Gu Li
(CCDI Group, Shanghai 200235, China)
Abstract:Foundation stiffness is a critical factor in overlong structure temperature action analysis, which should be obtained by field measurement. According to the temperature action analysis of some overlong pedestrian bridge, the actual foundation stiffness can be calculated by the lateral and vertical load test of piles. Different internal force distributions of fixed supports, linear spring supports and nonlinear spring supports were compared. The results show that the fixed supports have brought excessive constrain to some high stiffness structural members, such as concrete core shear wall, and have changed the configurations of temperature internal forces, which are quite different from the actual conditions. The limitations of some assumptions about foundation stiffness were discussed. The specific suggestions on the proper value of foundation stiffness were given.
Keywords: overlong structure; foundation stiffness; temperature action; lateral stiffness; vertical stiffness; pile
作者簡介：楊必峰，碩士，一級注冊結(jié)構(gòu)工程師，高級工程師，Email：yang.bifeng@ccdi.com.cn。
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