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（浙江省建筑設(shè)計(jì)研究院， 杭州 310006）

［摘要］當(dāng)基坑工程施工場(chǎng)地緊張時(shí)，基坑內(nèi)支撐常設(shè)置運(yùn)土車行走路線作為施工棧橋。移動(dòng)荷載作用下的內(nèi)支撐系統(tǒng)進(jìn)行優(yōu)化設(shè)計(jì)前必須先確定最大截面內(nèi)力。以實(shí)際基坑工程為背景，利用軟件ANSYS的APDL實(shí)現(xiàn)影響線的計(jì)算，比較各跨關(guān)鍵部位的內(nèi)力，然后得到最大截面內(nèi)力及相應(yīng)出現(xiàn)的位置，以及該最不利位置對(duì)應(yīng)的內(nèi)力影響線和相應(yīng)荷載作用位置。對(duì)于對(duì)稱支撐系統(tǒng)，可先分析一跨作用移動(dòng)荷載時(shí)的內(nèi)力影響線，然后根據(jù)對(duì)稱性確定另一跨移動(dòng)荷載的作用位置，以及相應(yīng)兩跨均作用移動(dòng)荷載時(shí)對(duì)應(yīng)的最大截面內(nèi)力。本研究也可供移動(dòng)荷載下逆作基坑中樓蓋結(jié)構(gòu)復(fù)核承載力參考。

［關(guān)鍵詞］內(nèi)支撐系統(tǒng)； 影響線； ANSYS； APDL； 截面優(yōu)化； 最不利位置

中圖分類號(hào)：TU443文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2017)06-0080-06

Section optimization design of internal support system based on influence line

Zhou Pinghuai, Yang Xuelin

(Zhejiang Province Institute of Architectural Design and Research, Hangzhou 310006, China)

Abstract:When the foundation pit construction site is insufficient, the foundation pit support is often set up earth-mover route as the construction trestle bridge. The largest section internal force should be determined before the optimization design of the internal support system under moving loads. Based on the actual foundation pit project as the background, influence line was calculated by using the software ANSYS/APDL, and the internal forces of the key parts of each span were compared. And then the largest section internal force was obtained as well as relevant position. In addition, influence line of the most unfavorable position and the corresponding load position were obtained. The results show that for the symmetric support system, it is reasonable to analyze the influence line of internal force of the structure with moving load on one span, and then moving load position of another span can be determined according to the symmetry, and the corresponding largest section internal force of the structure with moving loads on both two spans can be determined. This study can be used as a reference for checking the bearing capacity of the floor structure in the reversed constructed foundation pit under moving loads.

Keywords:internal support system; influence line; ANSYS; APDL; section optimization; the most unfavorable position

作者簡(jiǎn)介：周平槐，博士研究生，高級(jí)工程師，Email:anji18@126.com。