長安大學(xué)結(jié)構(gòu)設(shè)計原理課程設(shè)計(參考版)
2025-06-28 04:21本頁面
【正文】 2)Calculation of local pressure bearing capacityThe formula of local pressure bearing capacity is:concrete core area, 。 the squire side length is 200, and diameter of cable is 230.1)Size of local pressionLocal pression size meet the requirement of the concrete crack resistance:。0ay0aMG1MG21MG22+MQl正應(yīng)力3801716505792455+11+11+1127329725610983000001017000007740000003801716505792455+11+11+1127329725610983000001017000007740000003801716505792455+11+11+112732972561098300000101700000774000000Principal tensile stressPrinciple tensile stress calculation table in changing point section計算纖維SnS39。0S0Ib第一項第二項第三項256100198372000205824900137432000+1120023700209028000217848900153368000+11200210600224376000230929600159696000+11200198372000205824900137432000+11200求和（剪應(yīng)力） 2. Normal stressNpIIynbapepnAnInI39。0x0S0aS0x0 面積距239266511264139987 aax0x0 Vq= τ= 正應(yīng)力 計算纖維面積距剪應(yīng)力τ正應(yīng)力σ主應(yīng)力NpⅡ= 第一階段凈面積Sn第二階段凈面積S39。o第三階段凈面積SoσtpσcpNpⅡ=epn=aaσcx=x0x0204657417主應(yīng)力 bbσtp σcp 截面面積矩計算第一階段凈截面對其重心軸（重心軸位置x=）第二階段凈截面對其重心軸（重心軸位置x=）第三階段凈截面對其重心軸（重心軸位置x=） 截面類型 計算點位置aax0x0aax0x0aax0x0 面積局符號SnaSnx0S39。0x0S39。o第三階段凈面積SoσtpσcpNpⅡ=epn=aaσcx=x0x0203304322主應(yīng)力 bbσtp σcp L/4截面 截面面積矩計算第一階段凈截面對其重心軸（重心軸位置x=）第二階段凈截面對其重心軸（重心軸位置x=）第三階段凈截面對其重心軸（重心軸位置x=） 截面類型 計算點位置aax0x0bbaax0x0bbaax0x0bb 面積局符號SnaSnx0SnbS39。0x0S39。o第三階段凈面積SoσtpσcpNpⅡ= epn= aa σcx= x0x0216387428 主應(yīng)力 bb σtp σcp 跨中截面 截面面積矩計算第一階段凈截面對其重心軸（重心軸位置x=）第二階段凈截面對其重心軸（重心軸位置x=）第三階段凈截面對其重心軸（重心軸位置x=） 截面類型 計算點位置aax0x0bbaax0x0bbaax0x0bb 面積局符號SnaSnx0SnbS39。0x0S39。 Summarize table about each sections’ stresses losses and effective prestress各截面鋼束預(yù)應(yīng)力損失平均值及有效預(yù)應(yīng)力匯總表 預(yù)應(yīng)力階段σlⅠ=σl1+σl2+σl4使用階段σlⅡ=σl5+σl6鋼束有效預(yù)應(yīng)力 σl1σl2σl4σlⅠσl5σl6σlⅡ預(yù)加力階段使用階段跨中截面 1169L/4截面變化點截面1143支點截面9. Stress check1)Shortterm normal stress check(1)Concrete grade is C45 at cast, transport and setup stage. Carrying prestress and selfweight, the normal stress of edge section concrete should fit: f’ck(2)The normal stress of halfspan section on shortterm condition upper edge: bottom edge: Take the first stage as its section features: (C)(C) 2） longterm normal stress check（1）stress check of prestress reinforcement in long termthe steel cable stress is: （2）concrete primary stress check in long termTake IIII section as an example:: calculation of area moment:The area moment of area above aa to gravity axis：Use the same theory, area moment in different calculation point are shown in TableCalculation table of area moment持久狀況下的混凝土主應(yīng)力驗算 變化點截面 截面面積矩計算第一階段凈截面對其重心軸（重心軸位置x=）第二階段凈截面對其重心軸（重心軸位置x=）第三階段凈截面對其重心軸（重心軸位置x=） 截面類型 計算點位置aax0x0bbaax0x0bbaax0x0bb 面積局符號SnaSnx0SnbS39。Reinforcement stress at force anchor , (5)Stress losses caused by concrete creep and shrinkage：Stress losses caused by concrete creep and shrinkage could calculate by use the following formula:、——load age is , final value of concrete shrinkage strain, and final value of concrete creep.——Load age，the load age till the 90% of the design strength， , ；To the second stage dead load , the load age , assume =90d；The bridge is at the mon area of field. The relative humidity is 75%，thickness of the member (I－I section), get ，check the table, get the final value of creep coefficient ；The final value of concrete shrinkage strain .the average value of normal stress at t
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