型钢高性能混凝土框架结构数值模拟及参数分析

NUMERICAL SIMULATION FOR SRHPC FRAME AND PARAMETERS ANALYSIS

提出考虑粘结滑移的型钢混凝土组合结构的有限元建模方法,通过对比计算结果与试验结果验证建模方法的准确性。对型钢高性能混凝土(SRHPC)框架结构进行试验,主要考虑的参数为轴压比、混凝土强度、含钢率以及型钢强度。探讨诸参数对SRHPC框架承载能力和变形能力的影响,分析结构的失效机理。结果表明,型钢强度是影响结构基本性能最主要的因素,结构的承载能力和变形能力均可通过提高型钢强度而有效增大。轴压力的存在会降低结构的变形能力,但当轴压比小于0.4,可在一定程度上提高结构承载力。当轴压比超过0.4以后,结构的峰值荷载和变形能力随轴压比的增大而降低,且结构的负刚度段的斜率逐渐增大。

The finite element（FE） modeling method for steel reinforced high performance concrete（SRHPC） composite structure taking account of the interfacial bond-slip is proposed in this research.A comparison between FE results and test results validates the accuracy of the proposed method.The SRHPC structure is numerically analyzed by varying the design parameters,such as axial compression ratio,concrete strength,steel ratio and steel strength.The influence of these parameters on structural performance is discussed.The results show that structural performance is sensitive to steel strength.Bearing capacity and deformation capacity can be effectively improved as steel strength increases.The axial load has negative influence on the structural deformation capacity.However,if axial compression ratio is less than 0.4,the structural bearing capacity increases to some extent ration.If axial compression ratio is larger than 0.4,the structural performance,especially the negative stiffness,decreases rapidly as axial compression ratio increases.