|Table of Contents|

[1] Du Tao, Xie Nan, Jia Songsong,. Investigation and statistical analysis for variable materialloads on formwork system during construction [J]. Journal of Southeast University (English Edition), 2023, 39 (1): 17-25. [doi:10.3969/j.issn.1003-7985.2023.01.003]

Investigation and statistical analysis for variable materialloads on formwork system during construction()

Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

2023 1
Research Field:
Civil Engineering
Publishing date:


Investigation and statistical analysis for variable materialloads on formwork system during construction
Du Tao1 Xie Nan1 Jia Songsong2
1 School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China
2 Tangshan Jiantou Real Estate Development Co., Ltd., Tangshan 063000, China
formwork system variable material loads random field influence surface equivalent uniformly distributed loads
To accurately predict the variable material loads(VMLs)of concrete structures during construction, the equivalent uniformly distributed loads(EUDLs)are determined. The EUDL with the same load effects as the actual VML is produced on the shore. The VMLs of the reinforced concrete structure prior to and after concrete placement were investigated on-site and statistically analyzed. The statistical characteristics of the VML were obtained. The VML before and after concrete placements was randomly modeled to derive its spatial correlation. The finite element model of the formwork system was established. The characteristics of the influence surface for the shore axial force were analyzed using the maneuver method. Then, a random load was applied on the form surface. The EUDLs with the same load effects as the actual VML were calculated. By taking the standard value of a load, the recommended value of the VML prior to concrete placement is finally proposed. The results show that the VMLs surveyed at different construction sites vary greatly. With the increase in distance, the correlation coefficient of the random field zero-mean load gradually decreases. The recommended value of VMLs can be used to provide a reliable basis for the design and safety control of formwork systems.


[1] Carper K L. Structural failures during construction[J]. Journal of performance of constructed facilities, 1987, 1(3): 132-144. DOI: 10.1061/(ASCE)0887-3828(1987)1:3(132).
[2] Hadipriono F C, Wang H K. Causes of falsework collapses during construction[J]. Structural Safety, 1987, 4(3): 179-195. DOI: 10.1016/0167-4730(87)90012-9.
[3] Cimellaro G P, Domaneschi M. Stability analysis of different types of steel scaffolds[J]. Engineering Structures, 2017, 152: 535-548. DOI:10.1016/j.engstruct.2017.07.091.
[4] Buitrago M, Moragues J J, Calderón P A, et al. Structural failures in cast-in-place reinforced concrete building structures under construction[J]. Handbook of Materials Failure Analysis, 2018, 6: 153-170. DOI: 10.1016/B978-0-08-101928-3.00008-2.
[5] Structural Engineering Institute. Design loads on structure during construction: SEI/ASCE 37-02 [S]. Reston, VA, USA: American Society of Civil Engineers, 2002.
[6] Zhang C M, Fang D P, Geng C D, et al. In situ investigation and statistical analysis of live loads of reinforced concrete buildings during construction[J]. Engineering mechanics, 2002, 19(5): 62-66. DOI:CNKI:SUN:GCLX.0.2002-05-011. (in Chinese)
[7] Hu X P, Peng G, Zhang C Z, et al. Investigation and statistical analysis of variable loads of concrete building during construction[J]. Journal of Hohai University(Natural Sciences), 2019, 47(02): 131-137. DOI:10.3876/j.issn.1000-1980.2019.02.007. (in Chinese)
[8] Jian C J, Hu C M, Ye Z W, et al. In situ investigation and statistical analysis of live loads of large span frame structure during construction[J]. Construction Technology, 2015, 44(15):32-34. DOI: CNKI:SUN:SGJS.0.2015-15-011.(in Chin- ese)
[9] Xie N, Zhang J, Zhang L, et al. Surveys and statistical analyses of construction loads during concrete placement based on influence surface[J]. Engineering Mechanics, 2015, 32(2):90-96. DOI:10.6052/j.issn.1000-4750.2013.08.0 729. (in Chinese)
[10] Karshenas S, Ayoub H. Construction live loads on slab formworks before concrete placement[J]. Structural Safety, 1994, 14(3): 155-172. DOI:10.1016/0167-4730(94)90082-5.
[11] Ayoub H, Karshenas S. Survey results for concrete construction live loads on newly poured slabs[J]. Journal of Structural Engineering, 1994, 120(5): 1543-1562. DOI: 10.1061/(asce)0733-9445(1994)120:5(1543).
[12] Rosowsky D V, Philbrick T W, Huston D R. Observations from shore load measurements during concrete construction[J]. Journal of Performance of Constructed Facilities, 1997, 11(1):18-23. DOI: 10.1061/(ASCE)0887-3828(1997)11: 1(18).
[13] Ik�E4;heimonen J. Construction loads on shores and stability of horizontal formworks[D]. Stockholm, Sweden: Royal Institute of Technology, 1997.
[14] Puente I, Azkune M, Insausti A. Shore-slab interaction in multistory reinforced concrete buildings during construction: An experimental approach[J]. Engineering Structures, 2007, 29(5): 731-741. DOI: 10.1016/j.engstruct.2006.06.018.
[15] Zhang H, Reynolds J, Rasmussen K J R, et al. Reliability-based load requirements for formwork shores during concrete placement[J]. Journal of Structural Engineering, 2016, 142(1):04015094. DOI: 10.1061/(ASCE)ST.1943-541X.0001 362.
[16] Jin W L, Yuan X X, Liu X, et al. Grey relational comprehensive evaluation based on fuzzy numbers and its application in risk analysis for fastener-style tubular steel formwork-support[J]. Journal of Southeast University(Natural Science Edition), 2006, 36(4):621-624. DOI:1001-0505(2006)04-0621-04. (in Chinese)
[17] Yuan X X, Jin W L, Chen T M. Structural reliability of reinforced-concrete building under construction[J]. Industrial Construction, 2011, 41(5):60-65. DOI:10.13204/j.gyjz2011. 05.017. (in Chinese)
[18] Rosowsky D V, Stewart M G. Probabilistic construction load model for multistory reinforced-concrete buildings[J]. Journal of Performance of Constructed Facilities, 2001, 15(4): 145-152. DOI: 10.1061/(ASCE)0887-3828(2001)15:4(145).
[19] Standards Policy and Strategy Committee. Falsework—Performance requirements and general design: BS EN 12812:2008 [S]. London, UK: British Standards Institution, 2011.
[20] Standards Australia. Formwork for concrete: AS 3610-1995 [S]. Sydney, Australia: Standards Australia, 1995.
[21] Karshenas S, Ayoub H. Analysis of concrete construction live loads on newly poured slabs[J]. Journal of Structural Engineering, 1994, 120(5): 1525-1542. DOI: 10.10 61/(ASCE)0733-9445(1994)120:5(1525).
[22] Peir J C, Cornell C A. Spatial and temporal variability of live loads[J]. Journal of the Structural Division, 1973, 99(5): 903-922. DOI: 10.1061/JSDEAG.0003512.
[23] Du T, Xie N, Liu Z T, et al. Probabilistic limit state design of falsework considering joint lap defects during concrete pouring period[J]. Journal of Southeast University(Natural Science Edition), 2021, 51(4):575-580.(in Chinese)


Biographies: Du Tao(1990—), male, Ph.D. candidate; Xie Nan(corresponding author), female, doctor, professor, n_xie@ sina.com.
Foundation item: The National Natural Science Foundation of China(No. 51578050).
Citation: Du Tao, Xie Nan, Jia Songsong. Investigation and statistical analysis for variable material loads on formwork system during construction[J].Journal of Southeast University(English Edition), 2023, 39(1):17-25.DOI:10.3969/j.issn.1003-7985.2023.01.003.
Last Update: 2023-03-20