随着我国基础设施建设的不断完善，目前已进入建筑维护与改造的关键时期，H型钢加固RC组合梁，是一种新型装配式加固技术，具有施工效率高、承载性能优异等特点，适用于工业厂房的结构改造，具有广阔的应用前景，而迄今为止对于此类加固构件的研究体系尚不完整。因此，有必要对H型钢加固RC组合梁，采用试验研究与数值模拟相结合的方法研究论述其承载特性。主要研究内容与结论如下：

对5种不同抗弯刚度比的加固组合梁，和1根未加固的对照混凝土梁，进行三分点静力加载试验，旨在研究其抗弯承载性能，并为数值模拟研究提供试验数据基础。试验结果表明：经H型钢加固后的组合梁试件，其极限抗弯承载力较未加固梁提升幅度达6.2倍以上，展现出良好的加固效果；实测极限弯矩达到H型钢梁与混凝土梁理论计算值叠加结果的1.9~3.6倍，超叠加现象验证了加固方法具有优异的组合受力性能；加固组合梁初始刚度相比对照组提升7.6倍以上效果最为显著；加固组合梁的相对滑移量随着抗弯刚度比的增大而增大，抗弯刚度比在0.32~0.64区间内抗弯刚比对滑移影响成为次要因素；此加固方案在实现显著承载力提升的同时，兼具良好的延性性能。

基于ABAQUS数值模拟平台，对三分点静力加载试验进行模拟复现。利用试验结果，对比验证数值模型，结果表明：试验与模拟的混凝土损伤具有高度的一致性，加载全过程荷载位移曲线各个主要受力节点的平均误差均在10%以内，所以ABAQUS数值模型能够准确呈现三分点加载下加固组合梁的力学行为，通过验证的数值模型可作为有限元扩展参数研究的基础模型。

对通过验证的基础模型，增加参变量如：不同的剪跨比、改变箍板参数、增设加劲肋等。通过有限元软件计算结果分析得到以下结论：加固组合梁的抗剪承载力随剪跨比增大呈现先增后减小，其中三分点对称加载的工况下抗剪承载性能最佳，跨中单点加载时性能最弱；增设U型箍板可提升抗剪承载力约12%~15%，并且可有效降低试件的界面滑移16%~21%，提高试件延性性能；加劲肋与箍板同时使用可有效提升试件整体刚度1.5%~4.5%，并使得H型钢受力更为均匀，从而提高型钢有效利用率。

（4）基于分项叠加原理，提出了一种考虑U型箍板作用的组合梁极限抗剪承载力计算模型。该模型引入H型钢有效利用系数，以反映H型钢与混凝土梁的协同工作效应，同时结合箍板的应力状态与抗剪刚度比的关系引入箍板受力折减系数，对各分项优化。分析其理论计算值与试验结果和模拟结果吻合度较高，相对误差控制在10%以内，为工程加固设计提供了可靠的理论依据。

ABSTRACT

With the continuous improvement of infrastructure construction in China, it has entered a critical period of building maintenance and transformation. H-shaped steel reinforced RC composite beam is a new type of assembled reinforcement technology, which has the characteristics of high construction efficiency and excellent bearing performance. It is suitable for the structural transformation of industrial plants and has broad application prospects. So far, the research system for such reinforced components is not complete. Therefore, it is necessary to study the bearing characteristics of RC composite beams strengthened with H-shaped steel by combining experimental research with numerical simulation. The main research contents and conclusions are as follows :

( 1 ) Three-point static loading tests were carried out on five reinforced composite beams with different flexural stiffness ratios and one unreinforced control concrete beam, aiming to study its flexural bearing capacity and provide experimental data basis for numerical simulation. The test results show that the ultimate flexural bearing capacity of the composite beam specimen strengthened by H-shaped steel is more than 6.2 times higher than that of the unstrengthened beam, showing a good reinforcement effect. The measured ultimate bending moment is 1.9 ~ 3.6 times of the superposition result of the theoretical calculation value of the H-shaped steel beam and the concrete beam. The super-superposition phenomenon verifies that the reinforcement method has excellent combined mechanical performance. The initial stiffness of the reinforced composite beam is more than 7.6 times higher than that of the control group. The relative slip of the reinforced composite beam increases with the increase of the bending stiffness ratio, and the influence of the bending stiffness ratio on the slip becomes a secondary factor in the range of 0.32 ~ 0.64. This reinforcement scheme has good ductility while achieving significant bearing capacity improvement.

( 2 ) Based on the ABAQUS numerical simulation platform, the three-point static loading test is simulated and reproduced. Using the test results, the numerical model is compared and verified. The results show that the concrete damage between the test and the simulation is highly consistent, and the average error of each main force node in the load displacement curve of the whole loading process is within 10 %. Therefore, the ABAQUS numerical model can accurately present the mechanical behavior of the reinforced composite beam under the three-point loading. The verified numerical model can be used as the basic model for the variable parameter research of the finite element model.

( 3 ) For the basic model of the verification, increase the parameters such as : different shear span ratio, with or without hoop plate, hoop plate section size, with or without stiffeners, etc. Through the analysis of the calculation results of the finite element software, the following conclusions are obtained : the shear bearing capacity of the reinforced composite beam increases first and then decreases with the increase of the shear span ratio. Among them, the mechanical performance is the best under the three-point symmetrical loading condition, and the performance is the weakest under the single-point loading in the middle of the span ; the addition of U-shaped hoop plate can increase the shear bearing capacity by about 12 % ~ 15 %, and can effectively reduce the interface slip of the specimen and improve the ductility of the specimen. The use of stiffeners and stirrups at the same time can effectively improve the overall stiffness of the specimen by 1.5 ~ 4.5 %, and improve the effective utilization rate of H-shaped steel.

( 4 ) Based on the principle of partial superposition, a calculation model of ultimate shear capacity of composite beams considering the effect of U-shaped stirrups is proposed. In this model, the effective utilization coefficient of H-shaped steel is introduced to reflect the cooperative working effect of steel and concrete. At the same time, the stress reduction coefficient of the hoop plate is introduced according to the relationship between the stress state of the hoop plate and the shear stiffness ratio, and each sub-item is optimized. The theoretical calculation value is in good agreement with the experimental results and simulation results, and the relative error is controlled within 10 %, which provides a reliable theoretical basis for engineering reinforcement design.

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