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1、Foundation Design 马 德 林 学号 20100193 班级 2010级土木茅1班 西南交通大学土木工程学院2013年5月CONTENTSProblem-2Design-4 Chapter one Unit conversion-4 Chapter two Design load calculation-4 Chapter three Geotechnical designing-4 Step 1 to Step 9 Allowable bearing pressure method-4 Step 10 Checking moment load-8 Chapter four S
2、tructural designing-8 Part A Determine required thickness based on a two-way shear analysis-8 Check one-way shear-9 Part B Design the flexural steel-9 Chapter five Sketch of the designed footing-11 Figure 2 Thickness and effective depth-11 Figure 3 Dimensions and reinforcing steel-11 Figure 4 Inner
3、block and outer block-12 Figure 5 Structural show-12Problem:Design for Practice A proposed office building is to be constructed at the site with a geologic profile showed in figure 1. The ground table is at 5.5 ft. The shallow strata are very soft. The data for these strata maybe used in foundation
4、design were obtained from a series in-situ tests and laboratory tests, and showed in table 1. In the table, Su is undrained shear strength; is preconsolidation stress. Medium Sand (Dr=60%)0-ft12-ft23-ft27-ftGWT 5.5-ftHigh Plastic Clay (CH)Silty Clay (CL)Very Stiff Silty Clay (CL)Fig. 1 geologic sect
5、ion for the construction siteThe design columns of the proposed office building will carry the following loads: dead vertical load range 30-100 k, live vertical load range 20-75 k, and dead load moment range 0-50 ft-k. These columns are to be supported on spreading footings. A sketch of an interior
6、column and its spreading footing is given in figure 2. If such an interior carrying a 50k dead vertical load, a 50k live vertical load, and a dead load moment 20 ft-k. Try to determine the spreading footing of this column. The design task should including followings,Table 1 data for different strata
7、(ft)(1) Unit conversionBefore beginning your design, please convert the data in the figures and tables from English to SI, and please use SI in your designing.(2) Design load calculationThere are two methods of expressing and working with design loads: the allowable stress design (ASD) and resistanc
8、e factor design (LRFD). Calculate both of them.(3) Geotechnical designingSelect a suitable type of the spreading footing, determine the footing depth, determine allowable bearing pressure, and determine the required base dimensions for the footings of the column in Figure 2.Fig. 2 A sketch of the ty
9、pical interior column and its footing(4) Structural designingDetermine the materials using in the designed footings, determine the thickness of the footing, and determine the reinforcing steel of the footing.(5) Sketch of the designed footingShow your design in a sketch.A proposed designChapter one
10、Unit conversionTo ConvertTo Multiply byftm0.3048psfkPa0.04787pcfkN/m30.1571Data for different strata (SI)Depth Range(m)SoilDescription0-3.657CH16.49561.2740.150.02124.4623.657-7.010CL17.59586.1660.110.015143.6107.010-8.229Med.Sand18.852-0.0060.002-8.229CL18.538124.4620.080.01287.220Tips: to convenie
11、nt, English units will be used in the designing.Chapter two Design load calculationThe allowable stress design (ASD): ( ) ()Resistance factor design (LRFD): Chapter three Geotechnical designingStep 1- per TABLE 8.1 () Use an estimated D of 2 ft (24 in)Step 2- The groundwater table is at 5.5 ft ,and
12、is not a concern at this siteStep 3- per Figure 6.11 (Soil Type: Clay Design F with Typical Range) Use F=3.5step 4- For high clay, if saturated undrained conditions exist( as same as the problem statement), we may conduct a stress analysis with the shear strength defined as and . In this case, (per TABLE 6.1) Hence,. Using square foundation(B=L). Using the BEARING.XLS spreadsheet with ,the computed allowable bearing pressure, Step 5- per TABLE 2.
