论文部分内容阅读
“桥規§188条表26中规定了三个不同数值的主拉应力容許值,即R_P,R_(P-1),R_(p-2)。目前,这三个数值在具体应用上还有不同的理解。現在仅就我在学习桥規中的一些体会講講个人的看法。桥規§198条规定剪应力τ=Q/(b_Z)≤R其目的仅仅是保証受挠杆件不致因受到主拉应力的作用(因为計算(金人石)結构时不計受拉区砼的作用,因此主拉应力等于剪应力)而产生斜向裂缝。满足了这个条件並不是說受挠杆件的斜向强度就有了保証。因为R_p值仅为砼抗拉极限强度的(1/1.1),即安全系数为1.1,这对强度方面的安全性来說是不夠的(一般对受压的情况安全系数都在2.5
"Bridge Regulations §188 Table 26 provides three different values of the main tensile stress tolerance, namely R_P, R_ (P-1), R_ (p-2). At present, these three values in specific applications Have different understandings.Now I only talk about some of the experience in the study of bridge gauge personal views.Framework regulations §198 shear stress τ = Q / (b_Z) ≤ R its purpose is simply to ensure that the flexible rod does not cause Due to the role of the main tensile stress (because the calculation (gold stone structure does not count the role of concrete in the pull zone, the main tensile stress is equal to shear stress) and produce oblique cracks to meet this condition does not mean that by the flexible rod Because the R_p value is only (1 / 1.1) the ultimate tensile strength of the concrete, ie, the safety factor is 1.1, which is not sufficient for the safety of the strength Situation safety factor is at 2.5