Bài giảng Thủy công: Chương 2 (Tải trọng và lực tác dụng) - TS. Trần Văn Tỷ ( (p3)

Bài giảng "Thủy công - Chương 2: Tải trọng và lực tác dụng" giới thiệu tới người đọc các thiết kế và phương pháp tính tải trọng và lực tác dụng đối với các công trình thủy công. Mời các bạn cùng tham khảo nội dung chi tiết.
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Bài giảng Thủy công: Chương 2 (Tải trọng và lực tác dụng) - TS. Trần Văn Tỷ ( (p3) 8/7/2015Chương 2 TẢI TRỌNG VÀ LỰC TÁC DỤNG 1 2 1 8/7/2015 3??? 4 2 8/7/201556 3 8/7/201578 4 8/7/2015 9Theo Coulomb Kbđ = 1/Kcđ ??? 10 5 8/7/2015Theo Rankine Kbđ = 1/Kcđ 11 Phương pháp Coulomb 12 6 8/7/20151314 7 8/7/2015 15Phương pháp Rankine 16 8 8/7/20151718 9 8/7/20151920 10 8/7/20152122 11 8/7/2015 23Phương pháp Coulomb Phương pháp Rankine 24 12 8/7/20152526 13 8/7/2015 Distribution of earth pressures in case of broken terrainFigures show the procedure ofearth pressure analysis in thecase of sloping terrain. Theresulting shape of earthpressure distribution acting onthe construction is obtainedfrom the sum of triangulardistributions developed byindividual effects acting on theconstruction. Principle of the earth pressure computation in the case of broken terrain β < φ 27 Principle of the earth pressure computation in the case of broken terrain for β > φ 28 14 8/7/2015Concentrated surchargeThe concentrated load (resultant F due to surface or concentratedload – see figure) is transformed into a line load with a limitedlength. If the width of surface loading b is smaller than thedistance a from the back of wall (see figure) the alternate lineloading f having length 1+2*(a+b) receives the form: where: F - resultant due to surface or concentrated load a - distance of loading from the back of wall l - length of load b - width of surface loading 29If the width b of surface loading is greater than the distance afrom the back of wall (see figure) the alternate line loading fhaving length 1+2.(a+b) and width (a+b) reads: where: F - resultant due to surface or concentrated load a - distance of loading from the back of wall l - length of load b - width of surface loading 30 15 8/7/2015 Alternate loading for calculation of increment of active earth pressure 31Line surchargeVertical infinitely long line loading f acting on the groundsurface parallel with structure leads to a triangular increment ofactive earth pressure applied to the structure over a givensegment hf– see figure:Diagram of increment of active earth pressure due to vertical line loading acting on ground surface 32 16 8/7/2015Action of the line surcharge is deterimened such that two linesare drawn from the point of application following anglesφandϑa(corresponding to the critical slip surface), which isprovided by: where: φ - angle of internal friction of soil ε - angle d ...