- 摘 要
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(重慶大學(xué)土木工程學(xué)院， 重慶 400042)
［摘要］建立了3種不同跨度且跨度范圍為6～15m的3×3跨典型現(xiàn)澆混凝土空心樓蓋結(jié)構(gòu)模型，根據(jù)影響線原理分析出結(jié)構(gòu)控制截面達到最不利內(nèi)力時的消防車荷載布置方式，綜合考慮覆土厚度、樓板跨度和消防車并行臺數(shù)等3種因素的影響，采用有限元軟件ABAQUS進行結(jié)構(gòu)彈性受力分析，以荷載作用下控制截面的應(yīng)力及結(jié)構(gòu)變形為等效指標，得到了消防車的等效均布荷載值，并分析了3種因素對等效均布荷載值的影響規(guī)律。結(jié)果表明，消防車等效均布荷載值隨著覆土厚度和樓板跨度的增大而減小，而消防車并行臺數(shù)的增大使等效均布荷載值相應(yīng)增大。研究成果可為簡化大跨空心樓蓋消防車荷載的計算提供參考，也可為荷載相關(guān)規(guī)范的修訂提供依據(jù)。
［關(guān)鍵詞］現(xiàn)澆混凝土空心樓蓋； 覆土厚度； 樓板跨度； 等效均布荷載
中圖分類號：TU375-2文獻標識碼：A文章編號：1002-848X(2019)13-0132-05
Study on equivalent uniform load of fire trucks on cast-in-situ concrete hollow floor
Pi Tianxiang, Liang Heng, Su Yu, Pi Xuhua
(School of Civil Engineering, Chongqing University, Chongqing 400042, China)
Abstract:Three types of typical cast-in-situ concrete hollow floor structures with different spans in which quantity of span is 3×3 and spans ranging from 6 to 15m were established.According to the influence line principle, the layout of the fire engines loads were determined when the structural control section reached the most unfavorable internal force. Considering comprehensively the influence of three factors, such as the thickness of covering soil, the span of floor and the number of parallel fire trucks,etc, the finite element software ABAQUS was used to conduct elastic analysis of structure. Taking the stress and structural deformation of control section under load as equivalent indexes, the equivalent uniform load of fire engines was obtained, and the influence of three factors on the equivalent uniform load value was analyzed. The results show that the equivalent uniform load value of fire trucks decreases with the increase of cover soil thickness and floor span, while the equivalent uniform load value increases with the increase of parallel numbers of fire trucks. The research results can provide a reference for simplifying the load calculation of fire trucks with large-span hollow floor, and can also provide a basis for the revision of load-related codes.
Keywords:cast-in-situ concrete hollow floor; thickness of covering soil; floor span; equivalent uniform load
作者簡介：皮天祥，博士，副教授，一級注冊結(jié)構(gòu)工程師，Email：326848431@qq.com。
