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肋型板的等效刚度

2016-11-16丁婷丁圣果李绮文

中国建筑科学 2016年3期

丁婷 丁圣果 李绮文

摘 要:应用刚度等效原理导出肋型板的等代无肋板厚度计算显式,方法适既适用于不同纵、横梁布置的板,也适用于板边各种支承情况,包括边界点支承的板。针对工程中肋型板不同的边界约束状况,给出挠曲试函数各种形式。计算过程涉及的数值积分简便易行,便于工程技术人员运用,与有限单元法相比,无需计算机程序。多个典型算例的结果表明,代换前后板上的挠度分布特征及扭转角分布特征与有限元法计算结果在2%~5%误差范围一致。

关键词:现浇肋型板;等效刚度;能量法

中图分类号:TU13 文献标识码:A

【文章编号】1627-6868(2016)01-0018-04

Abstract: explicit for calculating thickness of board without ribs are derived by the principle of equivalent stiffness of the rib board, The proposed method is applicable to the board in various decorate of transom and longitudinal beam, , also apply to all kinds of plate edge support, including the plate supported by boundary point.In allusion to different type boundary constraints status of rib board in engineering, various forms of buckling trial function are given.Calculation process involves simple numerical integration only , so convenient application to engineering and technical personnel. Compared with finite element method,don't need to computer program. The results of several typical examples show that distribution of deflection and reverse angle before and after stiffness replacement of the plate are consistent, and calculating error only 2%-5% to finite element method

Key words: Cast-in-situ rib board, equivalent stiffness, the energy method

肋型板包括各种边界支承条件下的楼(屋)面梁板结构、井字楼盖。肋型板竖向刚度是设计中关注的问题之一。由于竖向荷载作用下梁肋和板协同工作,板的刚度、梁肋刚度及板边支承条件的差异均会对这一结构体系的组合刚度产生影响,从而对肋板作用效应产生影响。对于肋型板的作用效应,常规的计算用有限单元法完成[1][2][3][4],相对于无肋板而言,可供参考的计算结果并无现成的显式表述。我们从变形能等效原理出发,导出将各种肋形板等效为无肋板的等效刚度计算显式,适用于工程上应用的各类梁肋布置及各种边界支承肋型板的计算,旨在便于工程设计人员应用。

1.等变形能刚度代换

理论推理过程的基本假设是:具有相同平面尺寸的肋型板(图1a)与无肋板(图1b)在相同荷载q作用下具有相……

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