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[提要]  杭州大劇院主廳側(cè)墻高厚比較大，大梁跨度為25.5m，采用有粘結(jié)預(yù)應(yīng)力混凝土。側(cè)墻穩(wěn)定性驗(yàn)算、有粘結(jié)預(yù)應(yīng)力混凝土大梁的設(shè)計(jì)是該主廳結(jié)構(gòu)分析的主要問題。采用線性和非線性屈曲兩種分析方法對(duì)主廳薄壁混凝土墻體穩(wěn)定性進(jìn)行了計(jì)算。結(jié)果表明，線性屈曲所得的穩(wěn)定系數(shù)比非線性屈曲所得的穩(wěn)定系數(shù)大；加強(qiáng)結(jié)構(gòu)整體性可大幅提高混凝土墻體穩(wěn)定性。對(duì)預(yù)應(yīng)力大梁的設(shè)計(jì)，采用直線形和拋物線形兩種混合布筋方式，較好地解決了支座和跨中抗裂度難以同時(shí)滿足的問題，也能減小頂層柱、墻所承受的彎矩，并給出了確定兩種筋形比例的估算方法，以方便設(shè)計(jì)工作。
[關(guān)鍵詞]  薄壁混凝土墻  穩(wěn)定性  預(yù)應(yīng)力筋形  預(yù)應(yīng)力混凝土

The stability of the thin concrete walls and the design of bonded prestressed concrete beams with 25.5m long span are two key problems in Hangzhou Grand Theatre. This paper presents the results of linear and nonlinear buckling analysis. The linear buckling load of walls is far higher than nonlinear stability. To reinforce the integration between thin concrete wall and adjacent structural members is the more effective measure of increasing wall stability than the others. Applying two types of prestressed steel is a desirable method to satisfy the requirement of ultimate cracking capacity during normal service. The method to determine the optimal amounts of two different shapes steel is provided.
Keywords:  thin concrete wall; stability; steel shape; prestressed concrete