《12.5柱下独立基础.ppt

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2016-12-29 发布于北京
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《12.5柱下独立基础.ppt

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第十二章单层工业厂房排架计算第十二章单层工业厂房排架计算第五节柱下独立基础一、概述二、柱下独立基础设计形式：阶梯形、锥形 1、确定基础底面尺寸 1）轴心受压柱下基础 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2）偏心受压基础 Mbk—作用于基础地面的力矩标准组合值； W—基础底面面积的抵抗矩，W=lb2/6，b基础在弯矩作用方向的长度。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 通常采用试算法来确定偏心受压基础，先按轴心基础底面积扩大20~40%，然后验算： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 2、确定基础高度除应满足构造要求外，还应根据柱与基础交接处混凝土抗冲切承载力要求确定：对矩形柱和矩形基础，为防止冲切破坏，必须使冲切面外的地基反力所产生的冲切力Fl小于或等于冲切面处混凝土的抗冲切承载力。 P.134图12-56 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 图12-57 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 3、底板受力钢筋 I—I 截面： II—II 截面： Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 图12-57 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 图12-62 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 例题12-5 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile