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在实际工程中依据受压区新增及原有混凝土是否破坏,以及受压较小侧或受拉侧新增及原有钢筋是否屈服,在受压较大侧及受压较小侧(小偏压构件)或受拉侧(大偏压构件)两侧均采用外包混凝土加厚的矩形偏压构件具有9种可能发生的界限破坏形式。以目前加固结构承载力计算常用的基本假定为前提,得到了受压较大侧新浇筑混凝土及受压较小侧或受拉侧新增钢筋的滞后应变计算公式、各种界限破坏形式的大(小)偏压界限条件及承载力计算公式,并以一座实际加固工程桥梁为示例说明文中公式的应用。今后还需要在得到混凝土未达到极限压应变时混凝土压应力分布图形简化方式的研究成果后,对两侧加厚的矩形截面偏压构件承载力计算公式做进一步简化。
In the actual project based on the new compression zone and the original concrete is damaged, as well as the smaller side of the compression or tension side of the new reinforcement and whether to yield, in the larger pressure side and the smaller pressure side Bias members) or tensioned (large biasing members) on both sides of the outer concrete thickening rectangular biasing member has nine possible forms of boundary damage. Based on the assumption that the commonly used basic assumption for calculating the bearing capacity of the reinforced structure is present, the formula for calculating the hysteresis strain of the newly poured concrete on the large pressure side and the newly added steel bar on the pressure side is obtained. (Small) bias boundary conditions and bearing capacity of the formula, and an actual reinforced bridge as an example to illustrate the application of the formula. In the future, it is necessary to further simplify the calculation formula of bearing capacity of thickening rectangular cross-section biasing members on both sides after obtaining the research results of the simplified pattern of compressive stress distribution of concrete when the ultimate compressive strain of concrete is not reached.