钢—混凝土连续组合梁非线性力学性能分析

发布时间：2018-01-10 19:21

本文关键词：钢—混凝土连续组合梁非线性力学性能分析　出处：《哈尔滨工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：钢-混凝土连续组合梁在高层大跨空间结构中得到广泛应用，由于其极限承载力和正常使用下的承载力都比简支组合梁要高，变形小等优点，连续组合梁在工程中的应用具有更大的优势。但同时钢-混凝土连续组合梁受力具有材料非线性、界面滑移、混凝土翼板受拉开裂以及混凝土收缩徐变等非线性特征，使得其在较小的受力状态下就出现很大的非线性行为。本文以单跨钢-混凝土连续组合梁为研究对象，分析其非线性受力性能。本文利用有限元软件ABAQUS对连续组合梁的静力性能以及抗震性能进行建模分析。数值模拟验证中，，对简支组合梁进行精细化建模分析，模型内包含混凝土、钢材以及连接件三种不同本构的材料，采用非线性弹簧单元SPRING2模拟栓钉在混凝土翼板和钢梁交界面间的抗剪作用。通过与已有试验结果相对比，验证了此建模方法的可行性和可靠性，为后续连续组合梁的建模工作提供了依据。对连续组合梁静力性能进行分析，主要研究组合梁界面栓钉布置方式对其弹性以及弹塑性受力阶段的影响。对两种不同边界条件的单跨连续组合梁分别提出2组共6种不同的界面栓钉布置方案进行参数化分析。由分析结果得出：界面采用较小直径的栓钉，在较大剪力连接程度下有利于挠度控制以及正弯矩区段内材料力学性能优势的发挥；反之，若界面采用较大直径栓钉部分剪力连接，负弯矩区混凝土翼板开裂情况得到有效的控制。通过对结论的分析和总结提出工程中连续组合梁正负弯矩区段界面间栓钉的布置宜单独分开考虑，而不采用栓钉沿全梁均匀布置的方式，可使连续组合梁的静力性能得到优化。对组合梁竖向抗震性能进行研究，分析组合梁在低周反复荷载作用下的实际耗能能力。分析结果表明：组合梁具有良好的耗能能力；低周反复荷载作用下，混凝土材料在反复拉压过程中损伤严重，混凝土翼板的混凝土强度对组合梁整体耗能能力影响很小，混凝土强度等级大的连续组合梁耗能稍大。建议工程中组合梁的实际耗能能力可按其自身工字钢梁部分的耗能能力考虑以策安全。采用工程设计软件Midas/Gen对荷载长期作用下连续组合梁力学性能时变性特征进行研究，研究结果表明混凝土收缩徐变使连续组合梁的力学性能发生时变性：挠度和界面滑移量随时间发生变化；组合梁横截面上应力由混凝土翼缘向钢梁截面转移。
[Abstract]:Widely used in high-rise girder of long-span spatial structures of continuous composite steel concrete, the bearing capacity of the bearing capacity and normal use are simply supported composite beams to be high, the advantages of small deformation, has more advantages of continuous composite beam in construction. But at the same time of continuous steel concrete composite beams with nonlinear material, interface slip, tension cracking of concrete slab and concrete shrinkage creep nonlinear characteristics, the nonlinear behavior appeared great stress state on the lower. Based on the single span continuous steel concrete composite beam as the research object, the nonlinear analysis of the mechanical performance.
This paper uses the finite element software ABAQUS modeling and analysis of continuous composite beams under static performance and seismic performance. Numerical simulation, analysis of fine modeling of simply supported composite beams, the model contains concrete, steel and connecting pieces of three different constitutive materials, the nonlinear spring element SPRING2 simulation of studs in concrete slab the interface between the steel beam and the shear effect. By contrast with the existing test results, verify the feasibility and reliability of the modeling method, and provide the basis for subsequent continuous composite modeling work of the beam.
The continuous beam static performance analysis, the main research of composite beams. The stud arrangement for the elastic and elastic-plastic impact phase. The parametric analysis of two different boundary conditions of single span continuous composite beam are presented in 2 groups of 6 different interface stud layout scheme. By the analysis results the interface with smaller diameter studs, and is conducive to the deflection control of positive moment section material mechanical performance advantages in a larger degree of shear connection; on the contrary, if the interface of the large diameter stud shear connection, cracking of concrete slab negative bending moment area has been effectively controlled. The continuous composite beam bending moment section interface based on the conclusion of the analysis between the stud and put forward the project of layout should be considered separately, instead of the stud along the whole Liang Junyun layout, can make the continuous composite The static performance of the beam is optimized.
Study on seismic performance of vertical beam combination, analysis of composite beams under low cyclic loading of the actual energy dissipation capacity. Analysis results show that the composite beam has good energy dissipation capacity; cyclic loading of concrete materials in tension and compression in the process of repeated damage, concrete strength of concrete slab is very small in combination the overall effect of beam energy dissipation capacity, the strength grade of concrete continuous composite beam energy is slightly larger. Suggestions for engineering of composite beam in actual energy dissipation could be on its own part of the beam energy dissipation capacity consideration to ensure safety.
Using the engineering design software Midas/Gen degeneration features of the continuous beam on the mechanical properties of long-term load, the results show that the shrinkage and creep of concrete continuous composite has the mechanical properties of the beam deflection and time-varying: slip changes over time; the composite beam cross section stress by concrete flange steel beams to transfer.

【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU398.9

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