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(1 中國建筑第六工程局有限公司, 天津 300450;2 北京工業(yè)職業(yè)技術(shù)學(xué)院建筑與測繪工程學(xué)院, 北京 100042)
摘要: 為了在模板支撐架數(shù)值計(jì)算時合理選取相關(guān)參數(shù)和安全監(jiān)測時合理布置測點(diǎn),進(jìn)行了集中荷載作用下 4跨×6 跨×2 步的扣件式模板支撐架體系的破壞性試驗(yàn). 分析了模板支撐架體系立桿和水平桿的受力和變形狀態(tài),計(jì)算了桿件的彎矩,并分析了不同位置桿件彎矩分布規(guī)律. 結(jié)果表明,連續(xù)但不同跨度內(nèi)的水平桿彎曲方向相反,單跨水平桿彎曲形狀類似于正弦曲線;模板支撐架中上部立桿和水平桿彎矩較大,且彎矩由模板支撐架中上部向四周有逐漸減小的趨勢,但邊部立桿和水平桿彎矩值會顯著增加;立桿破壞時實(shí)測應(yīng)變值與計(jì)算應(yīng)變值差距較大;模板支撐架體系失穩(wěn)有一個荷載傳遞過程,其失穩(wěn)狀態(tài)與單個歐拉桿失穩(wěn)狀態(tài)有較大區(qū)別;立桿中間段應(yīng)變分布較為均勻,而兩端偏心受壓非常明顯,符合圣維南原理. 試驗(yàn)結(jié)論對模板支撐架失穩(wěn)分析和數(shù)值計(jì)算、模架設(shè)計(jì)、施工、管理以及安全監(jiān)測測點(diǎn)布置具有參考意義.
關(guān)鍵詞: 集中荷載; 模板支撐架; 彎矩分布; 監(jiān)測; 模型試驗(yàn)
中圖分類號:TU398. 7 文獻(xiàn)標(biāo)志碼:A 文章編號:1002-848X(2023)11-0143-06
DOI:10. 19701 / j. jzjg. 20201757
Experimental study on force of rod system of template support frame under concentrated load
ZHANG Binchang1, LIU Bin1, MA Weiwei1, LI Jianpeng1, CHEN Hui2, NIU Xuechao2
(1 China Construction Sixth Engineering Division Co. , Ltd. , Tianjin 300450, China;2 School of Architecture and Surveying Engineering, Beijing Polytechinc College, Beijing 100042, China)
Abstract: In order to reasonably select relevant parameters when numerical calculation of the template support frame andreasonably arrange the measuring points when safety monitoring, the destructive test of 4 span ×6 span ×2 step fastenertemplate support frame system under concentrated load was carried out. The force and deformation state of the vertical andhorizontal rods of the template support frame system were analyzed, and the bending moment of the rod was calculated andthe distribution law of the bending moment of the rod at different positions was analyzed. The results show that thehorizontal rods in the continuous but different spans are bent in the opposite direction. The single-span horizontal rod has acurved shape similar to a sinusoid. The bending moment of the vertical and horizontal rods is larger in the middle and upperpart of template support frame, and the bending moment gradually decreases from the middle and upper part of the formworksupport frame toward the circumference, but the bending moment value of the vertical rod and the horizontal rod in the sidewill increase significantly. The difference between the measured strain value and calculation strain value when the verticalrod fails is large. The instability of the template support frame has a load transfer process, which is quite different from theinstability state of a single Euler rod. The strain distribution in the middle of the vertical rod is relatively uniform, and theeccentric compression at both ends are very obvious, in line with the Saint-Venant principle. The test conclusion hasreference significance for the instability analysis and numerical calculation of the template support frame and the safetymonitoring point arrangement.
Keywords:concentrated load; template support frame; distribution of bending moment; monitor; model test
∗北京工業(yè)職業(yè)技術(shù)學(xué)院重點(diǎn)支持項(xiàng)目(BGZY2019KY-20ZY).
第一作者:張炳昌,學(xué)士,工程師,主要從事施工工藝和施工安全管理工作,Email:12256927@ qq. com.
[引用本文] 張斌昌,劉彬,馬偉偉,等. 集中荷載作用下模板支撐架桿系受力試驗(yàn)研究[ J]. 建筑結(jié)構(gòu),2023,53(11):143-148. ZHANG Binchang,LIU Bin,MA Weiwei,et al. Experimental study on force of rod system of templatesupport frame under concentrated load[J]. Building Structure,2023,53(11):143-148.
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