混凝土弧形梁板结构正常使用阶段受力性能评估

Mechanical performance evaluation of concrete curved beam and slab under normal use condition

弧形梁因其造型优美而被广泛应用于建筑结构。在竖向荷载作用下,弧形梁呈弯剪扭耦合的复杂受力状态,其安全性能引发了大量关注。本文以某高层建筑中混凝土弧形梁板结构为研究对象,发展了一种评估该类结构是否满足设计荷载标准及正常使用要求的方法。首先,对其进行部分正常使用荷载下的原位静力加载试验,测试构件的工作性能。然后,采用ABAQUS建立弧形梁板结构的有限元分析模型,进行试验相同工况下的受力模拟与结果对比。考虑全部的正常使用荷载,开展弧形梁板结构有限元分析,进而完成该类结构的受力性能评估。结果表明:按正常使用荷载考虑,试验弧形梁板的变形均小于规范限值且无明显裂缝,钢筋和混凝土的应力、应变均较小,满足正常使用状态的受力要求。

Curved beams are widely used in building structures because of their beautiful shapes.Under the action of vertical loads,the curved beam is usually in a complex state of coupled bending,shear,and torsion,and its safety performance has aroused concern.In this paper,taking a concrete curved beam and slab structure of high-rise building as an example,a method is developed to evaluate whether the structure meets the design load standards and requirements of serviceability limit state.First of all,the in-situ static loading test under part of normal service loads is carried out to test the working performance of the structural members.Then,the ABAQUS is used to establish the finite element analysis model of the arc beam and slab structure,and the stress simulation and results comparison under the same working conditions of the test are carried out.Considering all normal service loads,the finite element analysis of arc beam and slab structure is carried out to complete the mechanical performance evaluation of this type of structure.The results show that,considering the normal service load,the deformation of the test arc beam and slab is less than the limit value in the specification and there is no obvious crack,and the stress and strain of both the reinforcement and concrete are small,which meets the requirements of the serviceability limit state.