预应力约束下混凝土梁端的边角受压极限承载力分析1）

根据摩尔库伦破坏准则，提出梁端混凝土在预应力钢筋约束下的边角受压极限承载力的计算方法，并得出极限承载力理论值。通过与有限元软件ABAQUS计算出梁端混凝土在预应力钢筋约束下的边角受压极限承载力结果进行比较，发现摩尔库伦破坏准则所得的理论公式与数值分析结果相近，验证了本文推导的理论公式的正确性。该理论公式表明，预应力能较好地改善梁端混凝土的受力状态，提升梁端的极限承载力。

ANALYSIS OF ULTIMATE BEARING CAPACITY OF PRESTRESSING CONCRETE BEAM END UNDER CORNER PRESSURE 1)

Based on the Mohr-Coulomb failure criterion, this paper proposes a calculation method of the ultimate bearing capacity for the beam end concrete under the constraint of prestressed reinforcement, by which the theoretical value of the ultimate bearing capacity is obtained. The result is compared with that obtained by the finite element software ABAQUS. It is shown that the theoretical formula derived based on the failure criterion of Mohr-Coulomb gives a result consistent with the numerical one, which verifies the correctness of the theoretical formula. The theoretical formula shows that the prestress can improve the stress state of the beam end concrete, and the ultimate bearing capacity of the beam end.