摘要: The characteristics of nested loop for reflection transformation method and interpolation method were analyzed, a double iteration solving method of resistance partial factor was presented, and its program was designed by using VB. The resistance partial factors of bridge components were calculated when the effect ratios of living load to dead load were 0.10, 0.25, 0.50, 1.00, 1.50, 2.50. The resistance was modified by multiplying load effect combination value by resistance partial factor, and the corresponding reliability index was checked. Computation result indicates that component reliability index computed by using the method is larger than its target index. Their relative deviation is between 0.62%-0.92% under general operation state for vehicle, and it is between 0.62%-0.74% under dense operation state for vehicle. The result shows that the method is reliable and emphasis on safety.更多>
摘要: Steel slag concrete specimens were molded, in which the mass fractions of steel slag were respectively 10%, 30% and 50%. Ordinary concrete specimens and steel slag concrete specimens were respectively put into the waters with 40 ℃, 50 ℃ and 60 ℃, their compressive strengths and ultrasonic pulse velocities (UPV) were measured, and the effect of hot weather on the compressive strength of steel slag concrete was analyzed. Analysis result shows that the compressive strengths of concretes cured in hot weather do not decrease at different ages.The maximum compressive strength of steel slag concrete is 61 MPa at age 90 d, and is 18% bigger than that of ordinary concrete.Obviously, steel slag concrete has higher compressive strength in hot weather compared with ordinary concrete.更多>
