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Positive and negative shear lag behaviors of composite twin-girder decks with varying cross-section

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Science China(Technological Sciences) 2017年第1期60卷 116-132页

作者： ZHU Li nie jianguo JI WenYu Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry Department of Civil Engineering Tsinghua University Beijing 100084 China

In steel-concrete composite twin-girder decks, wide concrete slab would undergo significant shear lag warping effect, including positive and negative. Some researchers have investigated the positive shear lag of composite decks by means of one-dimensional line model, while the studies on the negative shear lag have not yet been reported until now. In this study, a new one-dimensional analytical model of composite twin-girder decks is first proposed based on the model proposed by Dezi et al. Besides slab shear lag effect and partial connection at slab-girder interface which have been included in the model of Dezi et al., the particularity of the proposed model relies on its ability to account for variation characteristic of cross-section. Verification of the analytical model is later conducted through comparison of results from the analytical analysis and elaborate FE analysis for a simply supported composite deck with increasing depth and a two-span continuous one with decreasing depth. Finally, three kinds of structural forms of composite twin-girder decks, including cantilever, simply supported and continuous decks, are selected to carry out the analysis of positive and negative shear lag behaviors by means of the analytical model. The influences of cross-sectional variation characteristic and load type on positive and negative shear lag behaviors are mainly investigated. Additionally, a new definition on effective width for considering simultaneously positive and negative shear lag behaviors is proposed. The results from the proposed analytical model and EC4 specification are compared to provide suggestions for designers and checkers. In this study, the proposed analytical model can provide a powerful numerical tool for researchers to conduct the further investigation, and the analysis on shear lag and effective width can assist in design analysis of composite twin-girder decks.

关键词： steel-concrete composite twin-girder deck analytical model variation of cross-section positive and negative shear lagbehavior effective width

Lateral stiffness of steel plate shear walls

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Science China(Technological Sciences) 2014年第1期57卷 151-162页

作者： nie jianguo ZHU Li Department of Civil Engineering Tsinghua University

The steel plate shear wall system has been used in a number of buildings as an innovative lateral force resistant *** often exist in the steel plate shear walls due to the various functional requirements of *** openings may negatively impact the lateral stiffness of steel plate shear ***,an experimental research was instituted to investigate the seismic behavior of steel plate shear walls,with and without *** experimental results showed that steel plate shear walls have the satisfying seismic behavior,and,as expected,the strength and stiffness characteristics of the walls were reduced due to *** a single-story wall panel FE model and an analytical deep beam model are developed in order to find the critical factors dominating the thickness reduction coefficient of wall panels with the ***,extensive parametric analysis is conducted to derive a simplified formula for the determination of the thickness reduction coefficient of wall panels with the opening for substituting solid wall panels with reduced thickness for actual wall panels with the ***,the design method for calculating the lateral stiffness is verified by some experimental programs and recommended for the routine practice of steel plate shear walls.

关键词： steel plate shear walls wall panels with the opening thickness reduction coefficient lateral stiffness design method analytical deep beam model

A new model for analyzing nonlinear torsion behavior of concrete filled steel tube columns with rectangular section

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Earthquake Engineering and Engineering Vibration 2016年第2期15卷 269-282页

作者： Wang Yuhang nie jianguo Fan Jiansheng School of Civil Engineering Chongqing University Department of Civil Engineering Tsinghua University

An experimental study on concrete filled steel tube columns with rectangular section subjected to compressionflexure-torsion combined action has been carried out. The failure modes and load-deformation hysteretic relations were obtained. Based on the principles of classical material mechanics, the relations between the torsion curvature of the section and the shear strain of the fiber on the section were established. Then the strain distribution on the rectangular section of concrete filled steel tube columns subjected to torsion was analyzed. The three-dimensional refined finite element model was also built, in order to make the precision verification. The matrix forms of the relation between the torsion curvature of the section and the shear strain of the fiber on the section were derived, and introduced into the fiber beam model considering nonlinear torsion effect on the section. The comparison between test results and calculation results showed that the fiber beam model considering nonlinear torsion effect had high modeling efficiency and solution precision for predicting the torsion behavior of concrete filled steel tube columns with rectangular sections, and was suitable for analyzing the dynamic response of various structures subjected to the combined cyclic load caused by the earthquake load.

关键词： torsion rectangular filled columns curvature verification refined rotation considering rigidity

Theoretical study on the confine-stiffening effect and fractal cracking of square concrete filled steel tubes in tension loads

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Frontiers of Structural and Civil Engineering 2021年第6期15卷 1317-1336页

作者： Meng ZHOU Jiaji WANG jianguo nie Qingrui YUE Central Research Institute of Building and Construction Co. Ltd.MCCBeijing 100088China Department of Civil Engineering Tsinghua UniversityBeijing 100086China Zhuhai Institute of Civil Construction-Safety Research Co. Ltd.Zhuhai 519000China Department of Civil and Environmental Engineering University of HoustonHoustonTX 77054US

Tension stress in steel-concrete composite is widely observed in engineering *** on an experimental program on tension performance of three square concrete-filled tubes(SCFT),the tension theory of SCFT is proposed using a mechanics-based *** tension stiffening effect,the confining strengthening effect and the confining stiffening effect,observed in tests of SCFTs are included in the developed tension theory ***,simplified constitutive models of steel and concrete are proposed for the axial tension performance of *** on the *** software,a special fiber beam-column element is proposed to include the confining effect of SCFTs under tension and *** proposed analytical theory,effective formulas,and equivalent constitutive laws are extensively verified against three available tests reported in the literature on both global level(e.g.,load-displacement curves)and strain *** experimental verification proves the accuracy of the proposed theory and formulations in simulating the performance of SCFT members under tension with the capability to accurately predict the tensile strength and stiffness enhancements and realistically simulate the fractal cracking phenomenon.

关键词： square concrete filled tubes confine-stiffening confine-strengthening fractal cracking fracture

Research and optimization on laminated steel tube column-concrete beam joints with outer stiffening ring

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Science China(Technological Sciences) 2013年第5期56卷 1282-1293页

作者： nie jianguo WANG YuHang TAO MuXuan Key Laboratory of Civil Engineering Safety and Durability of Ministry of Education Deparment of Civil EngineeringTsinghua University

In practical design,the joints with outer stiffening ring were used to connect concrete beams and laminated steel tube *** seismic behavior of joints with outer stiffening ring with various types was studied based on *** bearing capacity,rigidity,ductility,energy dissipation capacity,deformation property and strain distribution of the joints with outer stiffening ring with various types were comprehensively evaluated based on the test results of three specimens under quasistatic cyclic loading and finite element *** test results showed that the failure mode,hysteretic behavior,bearing capacity and rigidity degradation of the joints with outer stiffening ring with various types were nearly ***,the strain distribution of the outer stiffening ring of the three joints was nearly the *** detailing recommendation for the outer strengthening rings was proposed for the concrete beam-laminated steel tube column joints with outer stiffening ring,in order to ensure the good seismic capacity of the joints.

关键词： laminated steel tube column-concrete beam joint outer stiffening ring quasi-static test optimization

Technological development and engineering applications of novel steel-concrete composite structures

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 1-14页

作者： jianguo nie Jiaji WANG Shuangke GOU Yaoyu ZHU Jiansheng FAN Beijing Engineering Research Center of Steel and Concrete Composite Structures Tsinghua UniversityBeijing 100084China Key Laboratory of Civil Engineering Safety andDurability of China Education Ministry Department of Civil EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory for Track Technology of High-Speed Railway Beijing 100891China

In view of China's development trend of green building and building industrialization,based on the emerging requirements of the structural engineering community,the development and proposition of novel resourcesaving high-performance steel-concrete composite structural systems with adequate safety and durability has become a kernel development trend in structural *** paper provides a state of the art review of China's cutting-edge research and technologies in steel-concrete composite structures in recent years,including the building engineering,the bridge engineering and the special *** paper summarizes the technical principles and applications of the long-span bi-directional composite structures,the long-span composite transfer structures,the comprehensive crack control technique based on uplift-restricted and slip-permitted (URSP)connectors,the steel plate concrete composite (SPCC)strengthen technique,and the innovative composite *** improving and revising traditional structure types, the comprehensive superiority of steel-concrete composite structures is well *** research results also indicate that the high-performance steel-concrete composite structures have a promising popularizing prospect in the future.

关键词： high-performance composite structure bi-directional composite composite transfer uplift-restricted and slip- permitted connectors steel plate concrete composite strengthen

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高产玉米新品种黄冠丰693

中国种业 2024年第7期 191-192页

作者：武江涛聂建国温利芳山西省原平市农作物原种服务中心原平034100 山西省原平市段家堡乡综合便民服务中心原平034100

黄冠丰693是山西双惠种业股份有限公司于2018年在海南以J2638为母本、HD31为父本组配而成的玉米新品种,2023年通过山西省农作物品种审定委员会审定,审定编号:晋审玉20230057。该品种具有高产、稳产、抗病、抗倒伏等特点,种植表现优异,... 详细信息

黄冠丰693是山西双惠种业股份有限公司于2018年在海南以J2638为母本、HD31为父本组配而成的玉米新品种,2023年通过山西省农作物品种审定委员会审定,审定编号:晋审玉20230057。该品种具有高产、稳产、抗病、抗倒伏等特点,种植表现优异,推广应用前景广阔。

关键词：玉米黄冠丰693 新品种

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玉米新品种黄冠丰998高产栽培技术

中国种业 2024年第1期 158-159,162页

作者：贾彦青武江涛聂建国山西省原平市农业产业发展中心原平034100 山西省原平市农作物原种服务中心原平034100 山西省原平市段家堡乡综合便民服务中心原平034100

黄冠丰998是山西双惠种业股份有限公司于2018年在海南以H101作母本、cvf 78作父本组配成的玉米新品种,具有丰产性好、综合抗性强、表现优良稳定等特点,并于2023年通过山西省农作物品种审定委员会审定,审定编号:晋审玉20230056。总结了... 详细信息

黄冠丰998是山西双惠种业股份有限公司于2018年在海南以H101作母本、cvf 78作父本组配成的玉米新品种,具有丰产性好、综合抗性强、表现优良稳定等特点,并于2023年通过山西省农作物品种审定委员会审定,审定编号:晋审玉20230056。总结了该品种的高产栽培技术,实现良种良法配套,以期加速其推广应用。

关键词：玉米黄冠丰988 高产栽培技术

Behavior of composite rigid frame bridge under bi-directional seismic excitations

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Journal of Traffic and Transportation Engineering(English Edition) 2014年第1期1卷 62-71页

作者： Xiaogang Liu Jiansheng Fan jianguo nie Guo Li Department of Civil Engineering Tsinghua University

Pushover analysis and time history analysis are conducted to explore the bi-directional seismic behavior of composite steel-concrete rigid frame bridge, which is composed of RC piers and steel-concrete composite girders. Both longitudinal and transverse directions excitations are investigated using OpenSees. Firstly, the applicability of pushover analysis based on the funda- mental mode is discussed. Secondly, an improved pushover analysis method considering the contribution of higher modes is proposed, and the applicability on composite rigid frame bridges under bi-directional earthquake is verified. Based on this method, an approach to predict the displacement responses of composite rigid frame bridge under random hi-directional seismic excitations by revising the elasto-plastic demand curve is also proposed. It is observed that the developed method yield a good estimate on the responses of composite rigid frame bridges under bi-directional seismic excitations.

关键词： composite rigid frame bridge bi-directional Seismic excitation pushover analysis time history analysi