In order to solve the problem of degradation of dehumidification performance caused by the temperature rise of liquid desiccant in the dehumidification process of the adiabatic counterflow hollow fiber membrane dehumidification module(ADM),a novel internally-cooled counterflow hollow fiber membrane dehumidification module(ICDM)was developed in this paper.With the software Fluent,mathematical models of ICDM and ADM were built,to compare the difference in dehumidification performance between the two modules by analyzing their dehumidification capacity and efficiency,while revealing the influence rules of the air inlet parameters(flow rate,moisture content,temperature)and liquid desiccant inlet parameters(mass flow rate,temperature,concentration)on the performance of ADM and ICDM.The results showed that the variation of inlet parameters of ICDM and ADM are the same,but under the same conditions,compared with the ADM,the dehumidification capacity of ICDM was increased by 0.037 kg/h,and the dehumidification efficiency was increased by 18.33％at the maximum.In addition,the ICDM is more suitable for areas with large environmental temperature changes.This can provide reference for future design optimization of membrane dehumidification air conditioning technology.
This paper presents a new structure called cold-formed thin-walled channel steel and concrete composite column-corrugated steel shear wall (referred to as CSC-CSW), which can significantly improve the lateral resistance of SPSW. Three groups of full-length walls were tested under low-cycle reciprocating loading in order to investigate the effects of axial compression ratio and aspect ratio of steel plates. The experiment discovered that the failure of specimens was mainly caused by the tear of corrugated steel plate and the bearing failure of bolt hole. The results show that with the increase of the axial compression ratio, the average peak bearing ca-pacity, ductility and ultimate displacement are decreased. With the decrease of the aspect ratio of the steel plate, the shear capacity and initial stiffness of the specimen are decreased, but the ductility and energy dissipation capacity are improved. On the basis of the test, 19 refined FEA models were established to carry out the multi-parameter analysis. The influence rule of the parameters is revealed and the reasonable value range is given, namely. The thickness of channel steel ranges from 1.5 mm to 2.5 mm, the thickness of corrugated steel plate ranges from 1.5 mm to 2.5 mm and the aspect ratio goes from 0.8 to 1.2, and the axial compression ratio of frame column should not exceed 0.3. Finally, the shear-carrying calculation formula is proposed, and the reliability of the formula is verified by comparing formula calculation results with FEA results, whose maximum error is within 15%.
To enhance the mechanical properties and damage resistance of prefabricated monolithic composite beams, this study introduces HPFRCC precast mold shells as a replacement for ordinary concrete in the construction of prefabricated monolithic composite beams. These HPFRCC precast mold shell prefabricated monolithic composite beam members are then subjected to experimental investigations to analyze their flexural properties. The results of the study indicate that the U–shaped HPFRCC precast mold shell exhibits excellent bonding with the post-cast concrete, with no significant peeling observed. Moreover, compared to ordinary cast-in-place monolithic RC beams, the HPFRCC/RC prefabricated monolithic composite beams demonstrate a 17.2% increase in peak load and a 24.55% increase in yield load. Similarly, the HPFRCC/RC prefabricated monolithic composite beams show an 8.1% increase in peak load and a 5.59% increase in yield load compared to ordinary RC composite beams. In comparison to both ordinary cast-in-place monolithic RC beams and ordinary RC composite beams, the cracks observed in the HPFRCC/RC prefabricated monolithic composite beams are denser and finer, with a smaller crack development rate and width. These findings suggest that the incorporation of HPFRCC materials improves the damage resistance of the beam members.
利用有限元软件ABAQUS建立方形钢管混凝土叠合柱三面受火下的有限元模型，通过现有相关文献试验数据对有限元分析方法的有效性进行验证后，分析方形钢管混凝土叠合柱三面受火下的温度场分布、破坏形态、轴向位移-时间关系、内力重分布、应力、应变等力学性能，并对影响构件耐火性能的相关因素进行参数分析。结果表明，方形钢管混凝土叠合柱三面受火下的横截面温度场分布呈单轴对称形态，荷载比、长细比、柱截面尺寸、外部混凝土抗压强度、截面含钢率是影响构件耐火极限的主要影响因素。基于对各主要参数影响规律的系统分析，提出三面受火下方形钢管混凝土叠合柱耐火极限简化计算公式，为此类构件在该种受火工况下的抗火设计提供参考。
本研究以某大型航站楼为研究对象,开展了长期的室内环境质量监测工作.室内热湿环境测试结果表明,夏季与冬季室内PMV满足-1至+1要求的比例分别为92.9％与92.7％.在空间分布上,远机位登机口区域在冬季存在冷风渗透,造成室内温度低于舒适温度.在时间分布上,夏季与冬季的日内最高温度均出现在16:00时,最低温度出现在5:00时.室内CO2测试浓度平均值为496 ppm,且所有测试区域均未发现有浓度超标.室内CO2浓度与日旅客流量之间存在显著的线性相关性,拟合结果表明日旅客量每增加1 000人,航站楼日均CO2 浓度上升大约5.6 ppm.室内PM2.5达标率为86.8％,平均室内外浓度比值IO值为0.62.
