Laserfiche WebLink
SEC. 905.4 DESIGN LOADS & GENERAL REQUIREMENTS DESIGN Lo <br /> 905.4. Design. necessary, the allowabl <br /> a. Footings shall be so designed that the pressure on the sions made in the desi <br /> soil per unit of area shall, so far as possible, be uniform under all serious differential set <br /> parts of the building or structure. the structure. <br /> b. The areas of footings shall be in proportion to the full c. Where the beaj <br /> dead loads, including the weight of the footings; in no case shall overlie a stratum havi <br /> the full dead loads plus the live loads reduced in accordance with ' smaller values shall no <br /> section 902.8 cause a pressure under the footing exceeding the Computation of the ve <br /> soil bearing capacity permitted by section 906. any depth below a fou <br /> ,. that the load is spread <br />` SECTION 906. SOIL BEARING VALUES. the horizontal. <br /> 906.1. Subsurface explorations. 906.3. Soil tests. <br /> Before issuing a permit for the erection,addition to or alteration a. Whenever the <br /> building official may re <br /> of a building or structure,the building official, in the absence of data <br /> satisfactory to him, may require the owner to make borings, dig at the expense of the o <br /> test pits, or make tests of a satisfactory character at such locations, to determine the sustai <br /> ii <br /> and carried to such depths as will disclose the character of any test made the bn o <br /> materials underlying the site of the proposed building or structure i apparatus <br /> present in person <br /> apparatus and test pro, <br /> which may affect the stability or settlement of the structure. Such the building official. A <br /> records shall be certified by a competent engineer or architect. with the building official <br /> records of the results of all subsurface explorations shall <br />'p be filed with the building official. b. The proposed s <br /> of settlement obtained i <br /> 906.2. Presumptive capacity. 60 per cent of the set <br />'• _ load. The settlement u <br /> a. In the absence of satisfactory tests, the bearing value per inch. If, at the propos <br /> = square foot of soils shall be deemed to be as follows: satisfied, the allowable <br /> Softclay, medium ... ............................ .... 1.5 tons <br /> Medium stiff clay ... ................................ . 2.5 tons 906.4. Fill material <br /> iSand,fine,loose . ..... . . ... ............ .... .... .. .. ... 2 tons No foundation of ; <br /> • Sand, coarse, loose; compact fine sand; and loose sand- fill material, organic m <br /> gravel mixture .. . ............................... 3 tons sented to the building i <br /> Gravel,loose;and compact coarse sand .... ............ . 4 tons be adequately supported <br /> j Sand-gravel mixture, compact .. ............... ........ 6 tons <br /> Hardpan and exceptionally compacted or partially ce- <br /> mented gravels or sands ... ..... .. ............ ... . 10 tons <br /> Sedimentary rocks such as hard shales, sandstones, lime- 907.1. Materials. <br /> stones, silt stones, in sound condition .... . .. . . ... .. 15 tons ! Foundation walls sl <br /> F Foliated rocks such as schist or slate in sound condition .. 40 tons reinforced masonry or s1 <br /> Massive, bed rock, such as granite, diorite, gneiss, trap masonry units are use( <br /> rock, in sound condition .. ....... ........ ... .. ....100 tons } of the standards specifi <br /> b. Where portions of the foundation of an entire building ; this code. <br /> or structure rest directly upon, or are underlain by, medium or 1 <br /> soft clay upon different materials, or where the layers of such 907.2. Thickness. <br /> _t softer materials vary greatly in thickness, the magnitude and dis- a. Foundation oval <br /> tribution of the probable settlement shall be investigated, and, if I ness to resist lateral pr <br /> 129 <br />