设计变截面交叉柔性力学的模型在装配式钢构建筑梁柱预应力中的分析
A Flexible Mechanical Model with Variable Cross-Section in Prestress of Beam and Column of Prefabricated Steel Structure

为了提高装配式钢构建筑梁柱的抗震性能，设计一种变截面交叉柔性力学模型进行截面抗震性的预应力评估。方法中采用极限承载力约束进行抗震性分析，引入抗弯刚度软化系数进行误差修正，求出钢构建筑梁柱的荷载作用力矩，通过应力评估和结构解耦性设计，实现钢构建筑梁柱的抗震性评估。构建以钢材强度、延性指标和钢框架地震易损特征为约束参量的抗震性能分析函数，建立装配式钢构建筑梁柱开裂初始预应力预测方法，实现装配式钢构建筑梁柱预应力的准确评估。试验结果表明，所提模型能够对装配式钢构建筑梁柱的应力应变关系、屈服强度以及极限承载力进行准确计算，提高配式钢构建筑梁柱的抗震性能。
To improve the seismic performance of fabricated steel beams and columns, a flexible mechanical model with variable cross-section was designed to evaluate the prestress of the cross-section seismic performance. In this method, ultimate bearing capacity constraints were used for seismic analysis and flexural stiffness softening coefficient was introduced to correct the error and then the load moment of the steel beam and column was obtained. Through stress assessment and structural decoupling design, seismic evaluation of steel beam and column was realized. The seismic performance analysis function having steel strength, ductility index, and seismic vulnerability of steel frame as constraint parameters was constructed, and the prediction method of initial prestressing for thin waist cracking of prefabricated steel structure was established to realize the accurate evaluation of prestress of beam and column in prefabricated steel structure. The test results showed that the proposed model can accurately calculate the stress-strain relation, yield strength, and ultimate bearing capacity of beam and column in prefabricated steel structure, thereby improving the seismic performance of beam and column in prefabricated steel structure