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《后张法预应力钢铰线张拉理论伸长量计算》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
1、XX桥预应力钢铰线理论伸长量计算一、说明:1、计算依据《公路桥涵施工技术规范》和《公路钢筋混凝土桥涵设计规范》2、计算式:△L=PPL/APEPPP=P(1-e-(kx+µO))/(kx+µO)张拉端的张拉力=Pj=Pj·e-(µO+kx)计算时K为0.0015;µ为0.23;EP为1.93×105N/mm2;AP:140mm2×4=560mm23、XX桥施工图设计张拉力为781.2KN。4、张拉程序为010%σcon20%σcon100%σcon(持荷2min)(锚固)5、N1、N2计算时各段取值长度N14=0.65N13=0.524N12=4.189N11=3.159N
2、24=0.65N23=0.767N22=0.873N21=6.1916、两端张拉力N1束PA=0.75×1860×560=781.2KN=7.812×105NPB=7.812×105×e-(0.0015×0.65)=7.80×105NPC=7.80×105×e-(0.0015×0.524)=7.79×105NPD=7.79×105×e-(0.23×0.2094+0.0015×4.189)=7.38×105N平均张拉力PAB=7.812×105×(1-e-(0.0015×0.65))/(0.0015×0.65)=7.80×105NPBC=7.80×105×(1-e-(0.00
3、15×0.524))/(0.0015×0.524)=7.797×105NPCD=7.79×105×(1-e-(0.23×0.2094+0.0015×4.189))/(0.0015×4.189+0.23×0.2094)=7.58×105NPDO=7.38×105×(1-e-(0.0015×3.159))/(0.0015×3.159)=7.36×105N平均伸长值:△AB=7.809×0.65×103/560×1.93=4.7mm△BC=7.797×0.524×103/560×1.93=3.8mm△CD=7.58×4.189×103/560×1.93=29.4mm△DO=7.3
4、6×3.159×103/560×1.93=21.5mmN1束伸长值(4.7+3.8+29.4+21.5)×2=119mm(锚固前)N2束PA=0.75×1860×560=781.2KN=7.812×105NPB=7.812×105×e-(0.0015×0.65)=7.80×105NPC=7.80×105×e-(0.0015×0.767)=7.79×105NPD=7.79×105×e-(0.0015×0.873+0.23×0.035)=7.72×105N平均张拉力PAB=7.812×105×(1-e-(0.0015×0.65))/(0.0015×0.65)=7.809×105
5、NPBC=7.80×105×(1-e-(0.0015×0.767))/(0.0015×0.767)=7.80×105NPCD=7.79×105×(1-e-(0.0015×0.873+0.23×0.035))/(0.0015×0.873+0.23×0.035)=7.75×105NPCO=7.72×105×(1-e-(0.0015×6.191))/(0.0015×6.191)=7.68×105N平均伸长值:△AB=7.809×0.65×103/560×1.93=4.7mm△BC=7.80×0.767×103/560×1.93=5.5mm△CD=7.75×0.873×103/56
6、0×1.93=6.3mm△DO=7.68×6.191×103/560×1.93=44.0mmN2束伸长值(4.7+5.5+6.3+44.0)×2=121mm(锚固前)千斤顶油表读数计算1、千斤顶编号:553#油表编号:行程张拉力KN)油表读数(Mpa)10%78.125.120%156.249.3100%781.241.52、千斤顶编号#油表编号:18814行程张拉力KN)油表读数(Mpa)10%78.124.720%156.249100%781.243.35XX桥后张法预应力钢铰线张拉理论伸长量计算2008年5月23日
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