修建结构综合演习2及解析(国外英文资料).docVIP

建筑结构综合练习2及解析(国外英文资料) One, single choice question (B) 3. (B) 3. (D) 7. (B) 8. Two, multiple choice questions (A, B, C) 2. (B, C) 3. Third, true or false (square root) 3. (square root) 4. (square root) 7. 11. (x) Fourth, the short answer 1. A: optimal reinforcement beam from loading to cross section damage, can be divided into three stages: the tension zone of the load to the beam for the first stage, the cracks before is also called the elastic stage, the stress and strain are proportional, compression and tensile stress distribution of concrete graphics for the triangle. The second stage - work stage, the fracture properties of plastic concrete is as curved distance increase behave more and more obvious, the compressed stress graph curve changes, when steel bar stress reaches the yield point, to the end of the second stage. Third stage - failure stage, reinforced after reaching the yield strength, basic remains the same, stress strain increases sharply, significant curve distribution, the concrete concrete is to be crushed. 2. A: applied conditions: double reinforced rectangular section beam, the first condition is to ensure that the steel in the component before the damage to the yield strength, the second condition is to ensure that compressive stress to yield strength before destruction. The principle of the strength of reinforcement is that when the tensile strength of the reinforcement is greater than or equal to 400, the compressive strength of the steel bar is 400. When the tensile strength of the steel bar is less than 400, the compressive strength of the rebar is taken. Answer: the wall of rigidity and the building of the newly elastic plan should meet the requirement: A) the surface area of the hole should exceed 50% of the area of the cross section of the wall when opening the opening. B) the thickness of the horizontal wall should not be less than 180mm. C) the length of the horizontal wall of the single-storey house should not be less than its height,