川大建筑结构设计()141213春在线作业1（Sichuan building structures design (I) 1412 13 spring online homework 1）Sichuan building structures design (I) 1412 13 spring online homework 114, spring, 13 autumn, there are papers total score: 100 test time: -Radio examinationRadio examination questions (50 questions, 100 points)1. any of the following items is beyond the limit of serviceability?Under the load design value of A., the steel bar of the tension member of the axle has reached the yield strengthUnder the load standard value, the crack width in the beam exceeds the limit value of B.The partial compression of the concrete under the backing plate of the C. crane beam is not enoughThe D. component is out of stabilityFull marks: 22. when carrying on the normal section bearing capacity calculation of reinforced concrete rectangular section double reinforced beam, if x 0.7yC. e = 0.6yD. e0.6yFull marks: 24. RA. AB. BC. CD. DFull marks: 25. what are the following measures for reducing shrinkage cracks in concrete?A. add steel wire mesh in pouring concreteB. increase the amount of cement in the proportioning of concreteC. uses high-grade cementD. uses a small aggregate of elastic modulusFull marks: 26. eA. aB. BC.CD. DFull marks: 27. which of the following statements is true (?)The faster the loading rate of A., the lower the compressive strength of concrete cubeThe higher the aspect ratio of B. prism specimen is, the higher the compressive strength isC. concrete cube specimen can better reflect the actual compressive situation of concrete than prism specimenThe friction between the D. concrete specimen and the press pad makes the compressive strength of concrete increaseFull marks: 28. the strength design value of steel bars without apparent flow amplitude is determined by the following itemA. material strength standard value * material partial factorB. material strength standard value / material partial factorC. 0.85 * material strength standard value / material partial factorD. material strength standard value / (0.85 * material partial factor)Full marks: 29. the design reference period is the time parameter used to determine the variable load and the time dependent material performance value. The design reference period determined in our country is the following valueA. 25 yearsB. 50 yearsC. 100 yearsD. 75 yearsFull marks: 210. RA. aB. BC. CD. DFull marks: 211. what is the effect of carbon content in carbon structural steel on the strength, plasticity, toughness and weldability of steel?With the increase of A. strength, the plasticity and toughness decreased, and weldability improvedThe strength of B. increases, plasticity, toughness and weldability increaseThe strength of C. increases, plasticity, toughness and weldability decreaseThe strength, plasticity, toughness and weldability of D. all decreaseFull marks: 212. the allowable slenderness ratio of a truss member of a general building structure under static loads is the followingA. 350B. 250C. 300D. 400Full marks: 213. what will happen in reinforced concrete axial compression members under constant long-term load?A. creep increases the compressive stress of concreteThe compressive stresses of B. concrete and steel bars are unchangedC. creep reduces the compressive stress of concrete and increases the compressive stress of steel barD. creep increases the compressive stress of concrete and decreases the compressive stress of steel barFull marks: 214. what is the correct statement about the invention of cement?A. Portland cement was invented by Asp Ding Yu in England in 1824B. Portland cement was invented by American Edison in 1863C. Portland cement was invented in 1824 by the Englishman DaltonD. Portland cement was invented by the French Duma in 1863Full marks: 215. RA. AB. BC. CD. DFull marks: 216. for the steel bars without obvious amplitude, the standard value of strength is based onA. 0.9 times ultimate strengthB. 0.2 times ultimate strengthC. ultimate tensile strengthD. residual strain is 0.2% stressFull marks: 2In the 17. I-beam I16, the number 16 indicates the following itemA. section height of I-beam is 16cmB. section width of I-beam is 16cmC. I-beam c