有端部凸臺預(yù)應(yīng)力混凝土屋架起吊時下弦側(cè)向大彎曲分析
李明清1 陳維杰2 曹 閱2 劉 良2 姜永清3
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李明清1 陳維杰2 曹 閱2 劉 良2 姜永清3(1 遼寧國際建設(shè)集團 沈陽 110006; 2 遼寧金帝建設(shè)集團 沈陽 110004; 3 東北大學(xué)土木學(xué)院 沈陽 110004)
[提要] 后張法預(yù)應(yīng)力混凝土折線形屋架翻身扶直時,下弦產(chǎn)生較大平面外彎曲。從理論和實踐兩方面分析了屋架下弦產(chǎn)生側(cè)向大變形的各種原因和決定性因素,并提出側(cè)向撓度的計算方法、解決問題的途徑和措施。
[關(guān)鍵詞] 預(yù)應(yīng)力 折線形屋架 平面外剛度 施工措施The lower member of post-tensioning prestressed concrete roof truss has very large out-of-plane bending deformation when the folded roof truss stands up with supports. Pased on rational analysis of various main factors and experience, the calculating method of out-of-plane bending displacement and solving measures on construction are presented.
Keywords: folded roof truss; out-of-plane deformation; construction measures