1.东北林业大学土木工程学院，黑龙江哈尔滨 150040
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郭楠,张启珲,吴亦丹等.基于SAP2000分析的预应力胶合木连续梁调控效果[J].木材科学与技术,2021,35(02):42-48.
GUO Nan,ZHANG Qi-hui,WU Yi-dan,et al.Study on the Prestressed Control for Glulam Continuous Beams Using SAP2000[J].Chinese Journal of Wood Science and Technology,2021,35(02):42-48.
为了充分利用胶合木的抗压强度，常在梁中施加预应力，但受反拱幅度等影响，施加预应力需控制在合理范围内。通过SAP2000有限元程序建立分析模型，与试验结果对比验证其可行性后，对8种调控幅度的梁进行分析，得到荷载-挠度曲线、梁截面应力云图、极限承载力及合理调控范围。结果表明，调控幅度为极限荷载的18%~48%时，极限荷载增大3.65%~58.1%，胶合木连续梁的承载力基本呈线性增加；调控幅度为54%时，梁因破坏形态发生改变承载力开始下降。预应力胶合木连续梁的合理调控范围为极限荷载的24%~42%。
In order to take full advantage of the compressive strength of glulam, prestress is often applied on the beam. However, due to the influence of the arch amplitude and other reasons, the range of prestress can't be overly large, which will limit the full strength of the glulam and prestressed steel. For this reason, this study investigated the method of prestressed control of the glulam continuous beam. The finite element analysis model was generated using the SAP2000 program. The computer model was compared with the experimental results to verify the feasibility of the method. The load-deflection relation curve, the stress cloud diagram of beam section, the ultimate bearing capacity, and the reasonable control range of 8 beams with different control amplitudes were analyzed. The results show that when the control range is at 18%~48% of the ultimate load, the ultimate load increases by 3.65%~58.1%. At the same time, the bearing capacity of the glulam continuous beam increases linearly. When the range of control was over 54%, due to the change of failure mode, the bearing capacity of the beams began to decline. Finally, the reasonable control range of the prestressed glulam continuous beam is approximately 24%~42% of the ultimate load.
胶合木连续梁预应力调控有限元分析极限荷载
glulam continuous beamprestressed controlfinite element analysisultimate load
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