《地基基础6习题课.ppt

第六讲 * * 习 题 课 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 做题前思考以下几个问题： 1.地基承载力是否进行深宽修正？？ 2.上部荷载是标准值还是设计值？？ 2.对地基承载力进行深宽修正时，基础埋深d的选取？？ 3.基础底面以下土的重度应取持力层的重度！！如果有地下水，还应取土的浮重度！ 4.验算持力层的承载力时，其基底平均压力由上部荷载和回填土及基础自重两部分共同引起；回填土计算深度d0如何选取？？ 5.什么是软弱下卧层？？验算软弱下卧层时条形基础与独立基础的公式相同么？？ 6.计算基础底面尺寸是应取哪一种荷载效应组合？？计算基础厚度和配筋呢？？ 7.计算基础高度及配筋，其荷载包括基础自重及回填土重么？？ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 7.4某场地土层分布如图所示，作用与条形基础顶面的荷载标准值Fk＝300kN／m，弯矩Mk＝35kN· m／m，取基础埋置深度d＝0.8m，底宽b＝2.0m，试按承载力要求验算所选基础底面尺寸是否合适。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 7.5 某一砖厚（240mm）承重墙传来轴力标准值Fk＝180kN／m ，地基资料如图所示，试设计刚性地基，并验算软弱下卧层强度。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 7.6 某承重墙厚370mm，传来轴力设计值F＝280kN／m，基础埋深d＝0.8m，地基资料如图所示，混凝土强度等级C20，HPB235钢筋，试设计此钢筋混凝土墙下条形基础。 Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. 7.8 某厂房内柱传来荷载F＝1500kN、M＝90kN·m、V＝25kN，现浇柱截面400mm╳ 400mm，基础埋深d＝2m，基底以上土的加权平均重度γ0＝18kN／m3，基底处土的重度γ ＝18.4kN／m3，地基承载力特征值fa＝200kpa，混凝土强度等级C20，HPB235钢筋，试设计此基础 。 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. Ⅰ Ⅰ Ⅲ Ⅲ Evaluation only. Created with Aspose.Slides for .NET 3.5 Client Profile 5.2.0.0. Copyright 2004-2011 Aspose Pty Ltd. Ⅱ Ⅱ Ⅳ Ⅳ 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 2004-20