现浇板框架抗震性能的试验研究及理论分析

Experimental and Theoretical Study on Seismic Performance of RC Frames with Cast In situ Slabs

摘要:

以现浇板对空间框架结构抗震性能的影响为主要研究内容，开展了空间框架结构的水平低周反复抗震试验.对框架结构的破坏情况、滞回曲线，以及现浇板纵向钢筋应变、梁端弯矩和现浇板受拉有效翼缘宽度进行了分析.分析结果表明,由于现浇板参与工作，框架无法形成“强柱弱梁”的破坏机制；现浇板框架结构的耗能能力较好；现浇板纵筋应变随层间侧移角的增大而增大，表明板参与框架结构受力的程度逐步增强；现浇板的参与使得框架梁端弯矩提高.最后利用拉压杆模型对现浇板受拉有效翼缘宽度进行推导，所得公式与实际情况符合良好，能够有效反映现浇板参与结构抗震工作的情况，可以用于工程实际使用.

Abstract:

This paper presents a low frequency cyclic loading test for spatial reinforced concrete(RC) frames. The main research content in the study is the effect of the cast in situ slabs on the seismic performance of frames. The failure pattern of frame, hysteretic loop, strain of the slab longitudinal reinforcement, moment of beam and effective slab width were experimentally studied. Research findings indicate that the “strong column weak beam” can’t be realized due to slabs; the frame with cast in situ slabs has a good dissipation capacity; the strain of slab longitudinal reinforcement increases while the story drift increases, which indicates that the participation of slab increases; the moment of beams are enlarged by slabs. Finally, the strut and tied model (STM) is developed to calculate the effective slab width. The analysis results agree well with the test results, and the participation of slab on the seismic response of RC frames is better reflected by STM model. The formula can be applied to the construction engineering practice.