Thirdly , cbt ' s characteristic of the strain v . s . the applied pressure is studied , on the basis of this , a new scheme of the straight bourdon tube ( sbt ) is presented , a sbt is designed and fabricated , and then the strain - pressure characteristics of both the cbt and sbt are measured experimentally using a strain measuring technique , a comparison between the cbt ' s and sbt ' s strain characteristics is also made . finally , theoretical models of a fbg fluid pressure sensing system scheme based on the bourdon tube are developed , and a fbg - based fluid pressure sensing system using the transverse strain - pressure characteristic of the sbt is designed and set up 首先，详细介绍了fbg的基本光学传感特性，并测量了fbg的温度、应变特性；其次，研究了c型弹簧管的位移?压力特性，并利用ccd成像和计算机图像处理技术对其进行了非接触测量；再次，研究了c型弹簧管的应变?压力特性，在此基础上提出直弹簧管的设计方案，并制作了直弹簧管，采用应变测量技术对c型弹簧管和直弹簧管的应变?压力特性分别进行了测量，对两者的应变特性做了比较；最后，建立了基于弹簧管的fbg压力传感系统理论模型，设计完成了基于直弹簧管横向应变?压力特性的fbg流体压力传感系统。
We analyes post - tensioned prestressing properties and comparing with practiced results . we analyse one - way precast slab sandwich negative moment section resistant crack properties and two - way precast slabs sandwich under plane resistant crack at unprestressed section and second - prestressing propties . we compare canceling bonded reinforcement with laying on bonded reinforcement resistant crack properties and deformation . auxiliary lab include : concrete resistant pollution intensity . concrete resistant compressing intensity and elastic modulus , compare with results of code . analyse sandwich ' s strain and long - time stress , strain and introduce a new method through theory calculating long - time stress and strain 配套的试验研究有：混凝土的抗拉强度和弹性模量试验及混凝土的抗压强度和弹性模量试验，混凝土的极限抗拉强度和极限拉伸应变试验，并与《混凝土结构规范》 ( gb50010 - 2002 ) ，结果进行了对比；单块夹层板放张阶段的弹性应力、应变分析和长期应力、应变分析，并详细介绍了按混凝土徐变理论进行长期应力、应变分析的方法。
