预制板伸入支座长度对叠合板性能影响分析

Analysis on Influence of Length of Prefabricated Slab Extending into Support on Performance of Laminated Slab

为解决现浇梁内预埋钢套管与叠合板板端碰撞导致钢套管无法落位的问题,首先分析了单向叠合板叠合面受力特点,复核了板端抗剪承载力。计算结果表明,叠合板预制底板伸入梁(剪力墙)支座与否对叠合板等同现浇的受力性能影响极小,板端抗剪承载力规范公式求解值虽大幅下降,但叠合板抗剪安全富裕度仍较大。然后利用ABAQUS软件对叠合板预制底板伸入支座与否2种情况进行了有限元分析,结果表明2种情况下叠合板受力性能非常接近。考虑到目前国内外较多项目均采用预制板伸入支座的做法,建议一般情况下仍采用传统做法,但在套管预埋碰撞地方可采用预制板不伸入支座的做法。

In order to solve the problem that the steel sleeve cannot be placed due to the collision between the embedded steel sleeve in the cast-in-situ beam and the end of the laminated slab,the stress characteristics of the laminated surface of the one-way laminated slab are analyzed first,and the shear bearing capacity of the end of the slab is checked.The calculation results show that whether the prefabricated laminated slab base plate extends into the beam(shear wall)support or not has little effect on the mechanical behavior of the cast-in-situ laminated slab,and although the solution value of the specification for shear bearing capacity at the end of the slab is greatly reduced,the shear safety margin of the laminated slab is still large.Then the finite element analysis is carried out by using ABAQUS software for the two cases of whether the prefabricated bottom plate of the laminated slab extends into the support or not,and the results show that the mechanical properties of the laminated slab in the two cases are very close.Considering that many projects adopt the method of prefabricated slab extending into the support,it is suggested that the traditional method should be adopted in general,whilst the method of prefabricated slab not extending into the support can be adopted at the place where the casing is embedded and collided.