- 摘 要
-
（中國建筑科學(xué)研究院工程抗震研究所，北京 100013）
［摘要］在超大跨度預(yù)應(yīng)力梁設(shè)計時，為增加跨中區(qū)段預(yù)應(yīng)力筋主彎矩的作用，通常將預(yù)應(yīng)力筋布置為直線和拋物線的組合線形。研究表明，這種組合線形不能按等效荷載法來計算預(yù)應(yīng)力的作用，而應(yīng)采用約束次彎矩法來計算。推導(dǎo)了該種組合線形產(chǎn)生的約束次彎矩的計算公式，可方便運用到工程設(shè)計中，從而提高預(yù)應(yīng)力的計算精度。
［關(guān)鍵詞］直線和拋物線組合線形；約束次彎矩法；等效荷載法；次彎矩
Analysis of prestressing action caused by the combination form of line and parabola
Rong Weisheng(Institute of Earthquake Engineering, China Academy of Building Research, Beijing 100013, China)
Abstract:In order to increase primary moments in the middle sections of the span, the combination form of line and parabola is usually laid in the design of prestressed beams with great spans. Researches show that the equivalent load method couldn′t be used to calculate the prestressing action in the combination form, but the method of restraining secondary moments should be used. Formulae of restraining secondary moments caused by the combination form are presented for engineering design, and they can improve precision of prestressed structure design.
Keywords:combination form of line and parabola; method of restraining secondary moments; equivalent load method; secondary moment
作者簡介：榮維生，工學(xué)博士，高工，Email:rongweisheng@sina.com。
參考文獻(xiàn)
［1］楊建明，呂志濤.預(yù)應(yīng)力混凝土超靜定結(jié)構(gòu)次彎矩的簡捷計算［J］.建筑結(jié)構(gòu)學(xué)報，1989（3）.
［2］熊學(xué)玉，孫寶俊.有效預(yù)應(yīng)力作用下預(yù)應(yīng)力混凝土超靜定結(jié)構(gòu)的次彎矩計算［J］.建筑結(jié)構(gòu)學(xué)報，1994（12）.
［3］陶學(xué)康.后張預(yù)應(yīng)力混凝土結(jié)構(gòu)設(shè)計手冊［M］.北京：中國建筑工業(yè)出版社，1996.
［4］GB50010—2002混凝土結(jié)構(gòu)設(shè)計規(guī)范［S］.北京：中國建筑工業(yè)出版社，2002.
