- 摘 要
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(深圳市和域城建筑設(shè)計有限公司, 深圳 518063)
摘要: 現(xiàn)行規(guī)范中對剪力墻軸壓比的計算僅考慮重力荷載代表值的軸向壓力作用,基于此概念的剪力墻軸壓比限值規(guī)定存在值得商榷之處。 通過對一個具體工程案例的研究和分析,提出了對剪力墻截面在罕遇地震作用下,應力計算時考慮壓彎共同作用的計算方法,將原來控制墻肢軸壓比的思路轉(zhuǎn)變?yōu)榭刂茐χ膽Ρ取?采用了三種地震作用計算方式對嵌固端樓層剪力墻進行罕遇地震作用下的墻肢應力計算,根據(jù)約束條件和受力條件的不同,每個墻肢選取三個關(guān)鍵部位進行計算。 計算結(jié)果表明,考慮壓彎共同作用的計算方式能更有針對性地控制剪力墻的應力比,即便按照現(xiàn)行規(guī)范方式計算的墻肢軸壓比已經(jīng)超過限值,也能確保其在罕遇地震作用下混凝土不被壓潰;采用控制罕遇地震作用下墻肢應力比的方法,能夠優(yōu)化墻肢截面,使其混凝土抗壓性能得以充分發(fā)揮。
關(guān)鍵詞: 剪力墻軸壓比; 罕遇地震; 約束條件; 應力比; 壓彎共同作用
中圖分類號:TU318+. 1 文獻標志碼:A 文章編號:1002-848X(2022)23-0132-07
DOI:10. 19701 / j. jzjg. 20220099
Research and discussion on limit value of axial compression ratio of shear wall in current code
WANG Lei
(Shenzhen Hitrusdesign Co. , Ltd. , Shenzhen 518063, China)
Abstract:In current code, only the axial pressure of the representative value of gravity load is considered in the calculationof axial compression ratio of shear wall. The limit value of axial compression ratio of shear wall based on this concept isquestionable. Through the research and analysis of a specific engineering case, a calculation method considering thecombined action of compression and bending in the stress calculation of shear wall section under rare earthquake wasproposed, which changes the original idea of controlling the axial compression ratio of wall limb into controlling the stressratio of wall limb. Three seismic action calculation methods were used to calculate the wall limb stress of the shear walls ofthe embedded end floor under the rare earthquake. According to the different constraint conditions and stress conditions,three key parts of each wall limb were selected for calculation. The calculation results show that the calculation methodconsidering the combined action of compression and bending can more pertinently control the stress ratio of the shear wall,even if the axial compression ratio of wall limb calculated according to the current code has exceeded the limit, it canensure that the concrete will not be crushed under the rare earthquake. The method of controlling the stress ratio of walllimb under rare earthquake can optimize the section of wall limb and give full play to the compressive performance ofconcrete.
Keywords:axial compression ratio of shear wall; rare earthquake; constraint condition; stress ratio; the combined action ofcompression and bending
第一作者:王磊,碩士,高級工程師,主要從事結(jié)構(gòu)設(shè)計工作,Email:150436765@ qq. com。
[引用本文] 王磊. 現(xiàn)行規(guī)范剪力墻軸壓比限值的研究和探討[J]. 建筑結(jié)構(gòu),2022,52(23):132-138. WANG Lei.Research and discussion on limit value of axial compression ratio of shear wall in current code[ J]. Building Structure,2022,52(23):132-138.
