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（1 中鐵二院工程集團(tuán)有限責(zé)任公司， 成都 610031； 2 北京未來城市設(shè)計(jì)高精尖創(chuàng)新中心， 北京 100044；3 北京建筑大學(xué)土木與交通工程學(xué)院， 北京 100044； 4 東南大學(xué)土木工程學(xué)院， 南京 211189）

［摘要］提出了考慮單向板長寬比與公交車布置數(shù)量的等效均布荷載取值方法，并以某城市交通樞紐樓板為對(duì)象開展了樓面等效均布荷載取值研究。首先，在樓板上施加不同布置組合形式的公交車荷載，以確定公交車車輪最不利荷載位置。在此基礎(chǔ)上，對(duì)規(guī)范取值計(jì)算出的等效均布荷載與實(shí)際車輪荷載進(jìn)行對(duì)比，并引入單向板長寬比與車輛數(shù)量參數(shù)，在規(guī)范計(jì)算公式的基礎(chǔ)上提出了改進(jìn)的計(jì)算公式。結(jié)果表明：規(guī)范計(jì)算出的絕對(duì)最大彎矩不能很好地反映單向樓板受小面積局部荷載的受力特點(diǎn)；考慮長寬比與公交車數(shù)量的改進(jìn)計(jì)算公式計(jì)算出的等效均布荷載所產(chǎn)生的結(jié)構(gòu)響應(yīng)與實(shí)際車輪荷載產(chǎn)生的結(jié)構(gòu)響應(yīng)較為相近，且偏于安全；樓板活荷載等效方法與樓板所在結(jié)構(gòu)區(qū)域關(guān)系較小，均可采用改進(jìn)計(jì)算公式進(jìn)行計(jì)算。

［關(guān)鍵詞］樓板長寬比； 城市公交樞紐； 大跨樓板； 重載公交車； 活荷載等效方法

中圖分類號(hào)：TU375-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)24-0060-07

Study on equivalent method of live load of urban transportation hub floor slab

Wang Shipei1, Li Yuhang2,3，4, Zhang Lin1, Li Aiqun2,3,4, Deng Yang2,3

（1 China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China; 2 Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China; 3 School of Civil & Transportation Engineering, Beijing University of Civil Engineering and Architecture, Beijing 100044, China;  4 College of Civil Engineering, Southeast University, Nanjing 211189, China）

Abstract:An equivalent uniform load method for considering the length-to-width ratio of one-way slab and public transit vehicle quantity was presented. The value of the equivalent uniform load of the slab was studied with a urban transportation hub floor as an object. Firstly, the public transit vehicle loads of different arrangement combinations were applied to the floor to determine the most unfavorable load position of the vehicle wheels. On this basis, the equivalent uniform load was calculated according to the code to compare with the actual wheel load, and the length-to-width ratio of the one-way slab and the vehicle quantity were introduced as coefficients. Finally, the  improved formula are proposed based on the formula of code. The results show that the absolute maximum bending moment calculated by the code method cannot reflect the force and transmission characteristics of the small-area local load on the one-way slab, the structural response produced by the equivalent uniform load calculated by the improved formula including the coefficient of slab length-to-width ratio and vehicle quantity is similar to that of the actual wheel load, and it is safer. The improved equivalent method of the floor is less related to the area of the structure where the floor is located, and it is suitable for any area of the structure.

Keywords:slab length-to-width ratio; urban transportation hub; large-span slab; heavy-loaded public transit vehicle; live load equivalent method

*國家自然科學(xué)基金項(xiàng)目（51878027）。

通訊作者：李雨航，博士研究生，Email：liyuhang@stu.bucea.edu.cn。