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首页> 外文期刊>Journal of Engineering Mechanics >Finite element response sensitivity analysis of steel-concrete composite beams with deformable shear connection
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Finite element response sensitivity analysis of steel-concrete composite beams with deformable shear connection

机译：变形剪切连接的钢-混凝土组合梁的有限元响应灵敏度分析

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The behavior of steel-concrete composite beams is strongly influenced by the type of shear connection between the steel beam and the concrete slab. For accurate analytical predictions, the structural model must account for the interlayer slip between these two components. In numerous engineering applications (e.g., in the fields of structural optimization, structural reliability analysis, and finite element model updating), accurate response sensitivity calculations are needed as much as the corresponding response simulation results. This paper focuses on a procedure for response sensitivity analysis of steel-concrete composite structures using displacement-based locking-free frame elements including deformable shear connection with fiber discretization of the cross section. Realistic cyclic uniaxial constitutive laws are adopted for the steel and concrete materials as well as for the shear connection. The finite element response sensitivity analysis is performed according to the direct differentiation method. The concrete and shear connection material models as well as the static condensation procedure at the element level are extended for response sensitivity computations. Two steel-concrete composite structures for which experimental test results are available in the literature are used as realistic testbeds for response and response sensitivity analysis. These benchmark structures consist of a nonsymmetric, two-span continuous beam subjected to monotonic loading and a frame subassemblage under cyclic loading. The new analytical derivations for response sensitivity calculations and their computer implementation are validated through forward finite difference analysis based on the two benchmark examples considered. Selected sensitivity analysis results are shown for validation purposes and for quantifying the effect and relative importance of the various material parameters in regards to the nonlinear monotonic and cyclic response of the testbed structures.
机译：钢混凝土组合梁的性能受钢梁和混凝土板之间的抗剪连接类型的强烈影响。为了进行准确的分析预测，结构模型必须考虑这两个组件之间的层间滑动。在众多工程应用中（例如，在结构优化，结构可靠性分析和有限元模型更新领域），需要精确的响应灵敏度计算以及相应的响应仿真结果。本文着重于使用基于位移的无锁框架元件进行钢-混凝土复合结构响应灵敏度分析的程序，该框架元件包括可变形的剪切连接以及纤维的离散化。钢材和混凝土材料以及剪力连接采用了现实的循环单轴本构定律。根据直接微分法进行有限元响应灵敏度分析。扩展了混凝土和剪力连接材料模型以及单元一级的静态冷凝程序，以进行响应灵敏度计算。两种钢-混凝土复合结构（其文献中提供了实验测试结果）被用作用于响应和响应灵敏度分析的实际测试平台。这些基准结构由承受单调载荷的非对称两跨连续梁和循环载荷下的框架子组件组成。基于所考虑的两个基准示例，通过正向有限差分分析验证了用于响应灵敏度计算的新分析推导及其计算机实现。显示了选定的灵敏度分析结果，以用于验证目的并用于量化各种材料参数相对于测试台结构的非线性单调和循环响应的效果和相对重要性。

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