( 5 ) horizontal load can increase the bearing ability of the section and the limiting load of the frame when value of is little . however , horizontal load can generates axial force and then deceases the ductility and bearing ability when is large ( 5 )在中支座截面相对受压区高度较小时，水平荷载在框架梁中产生轴力，提高截面的承载力，极限荷载也随之提高。
The paper has concluded the fundamental principle of sticking reinforcement . that is to improve the ultimate flexural capacity of the original reinforced concrete beam through externally bonded with high - strength tension materials 本文总结出粘贴加固的基本原理：通过粘贴高强的抗拉材料，进而使得受弯构件的受压区混凝土高度增加，从而提高原钢筋混凝土受弯构件的正截面承载力。
( 3 ) the relative height compressive zone of section greatly influences the redistribution of internal force of the prestressed frames . the total modulation of moment decreases according as the increase of relative height compressive zone of section 随着中支座截面相对受压区高度的增大，次弯矩增大，次弯矩调幅增大，但荷载弯矩调幅以更大的幅度下降，导致总的弯矩调幅下降。
2 . the effect of frp reinforcement ratio on the ultimate moment of frp reinforced concrete beam is studied , the conclusion is that the ultimate moment increases with the increase of the reinforcement ratio for frp reinforced concrete beam in a certain range of reinforcement ratio 结果表明，对纤维增强塑料筋混凝土梁，在配筋率的一定范围内，配筋率越大，受压区面积越大，极限抗弯承载力越高。
2 ) the secondary moment is an important factor on moment modulation . when is small , influence of the secondary moment on moment modulation is small . contrary , when is high , influence of the secondary moment is important （ 2 ）次弯矩的调幅作用非常明显，当相对受压区高度较小时，次弯矩对调幅的影响作用也小；反之，当相对受压区高度较大时，次弯矩对调幅的影响作用越大，有时，甚至起控制作用。
Supposing the concrete structure is loaded at two times , the theory of rc can be used to deduce the formula of bending terminal bearing capacity of cfrp reinforced concrete structure , and the nonlinear stress - strain relationship of concrete is taken into account rightly 摘要在考虑二次受力的基础上，充分考虑了受压区混凝土的非线性应力应变关系，利用钢筋混凝土的相关原理对cfrp加固结构的受弯极限承载力公式进行了相关推导。
The secondary moment has no influence on ultimate limit loads . when is high , rotation ability of section is shortage . the secondary moment improve ultimate limit loads of frames by improvement rotation ability of section 但相对受压区高度较小时，截面本身具有足够的转动能力，此时次弯矩的存在不会影响框架结构的极限承载能力；当相对受压区高度较大时，截面本身的转动能力较小，此时次弯矩可以通过提高截面的转动能力而提高框架结构的承载能力。
In order to assure the bonded - strengthened beams to have ductility and fully exert the compressive capability of concrete , the paper deduces the lower limit compressive height used in design from the plane section assumption and theory of limit destruction . the lower limit compressive height is when the strain of compressive edge fiber reaches its peak value ( 0 . 002 ) and the externally bonded material reaches its limited strain ( 0 . 01 ) 由平截面假定和界限破坏理论，并保证粘贴加固梁具有一定的变形能力和较为充分地发挥混凝土的抗压性能，本文以受压区混凝土边缘应变达到峰值应变( 0 . 002 ) ，而加固材料应变刚好达到极限值( 0 . 01 )的界限破坏时混凝土受压区高度做为粘贴加固梁设计高度的下限值_ ( c0b ) h 。
At first , the experiment carried out by tianjin university has been analysed according to the " nonlinear balance trying calculation " method , and the values of yield load and ultimate load agree with the test result better , and the curve of bending moment - curvature , bending moment - deflection can agree with the results . the second , the simplified formula for evaluation the ultimate flexural capacity of cfrp strengthened rc members is presented according to the three probable failure modes ( compression failure ; cfrp rupture ; crushing of the concrete in compression before yielding of the reinforcing steel ) . it is applicable to both singly and doubly reinforced rectangular sections , as well as flanged sections 首先利用钢筋混凝土非线性平衡试算法对天津大学试验进行了理论分析，所得分析值与试验结果相比，加固梁的屈服荷载、极限荷载能够很好地吻合，弯矩曲率关系曲线及弯矩挠度关系曲线较为吻合；其次，为了满足实际工程的需要，根据碳纤维布加固构件可能发生的三种破坏形态(压区混凝土压碎破坏、碳纤维布拉断破坏以及受拉钢筋尚未屈服时压区混凝土已压碎破坏) ，区别三种钢筋混凝土构件截面形式(单筋矩形截面、双筋矩形截面、 t形截面) ，分别给出了碳纤维布加固混凝土构件抗弯承载力的简化计算公式和适用条件，并进一步探讨了这三种截面形式下进行加固设计和复核的步骤。
The minimum shear resistance of beams in the paper is close to the one in the code for design of concrete structures " gb50010 - 2002 ' . according to the actual project , the destroy of 448 kinds of beams are analyzed by computer by taking account of the effective coefficient " " of the strength of concrete confined by hoops , the relationship with the section property of beams , the critical point of the arch - rib failure transiting to the shear - compression failure which is advanced in the anti - theory , and the contribution to the beam ' s shear resistance of the concrete in the shear - compression zone 引用箍筋约束混凝土的有效系数，利用其与梁截面特性的关系并结合理论分析中提出的梁剪压破坏与斜压破坏的分界点，同时考虑了剪压区混凝土的抗剪贡献，从工程实际出发，编程拟算了448种梁构件的破坏情况，计算结果表明，梁发生在剪压破坏范围内的最大抗剪承载力值比混凝土结构设计规范gb50010 - 2002值略高。
