推广应用新型模板和脚手架需解决的几个问题

目前新型模板和脚手架在推广应用过程中出现的一些问题，如标准制订和颁布严重滞后，代低省产品流入市场等，对此提出了解决这些问题的途径和措施。     

轻钢增层结构的设计与构造

通过对轻钢增层结构设计与构造方法的介绍，提出了轻钢增层结构中的关键技术问题，为轻钢增层结构的合理设计与研究提供参考。     

基于人工神经网络的混凝土抗压强度预测方法

在给出混凝土等效水灰比和骨料平均浆体厚度计算方法的基础上，采用人工神经网络方法，建立了混凝土28d抗压强度与混凝土等效水灰比、骨料平均浆体厚度和粉煤灰与胶凝材料用量比之间的非线性映射关系．该研究成果可减少混凝土试配次数，节约大量人力、物力和时间，并为高体积稳定性混凝土配合比设计方法的研究进一步奠定了基础．     

高温下钢筋砼连续梁的破坏机构和内力重分布研究

通过对6根钢筋砼两跨连续梁进行高温试验,分析了连续梁的破坏特征、机构以及内力重分布情况.结果表明,在升温过程中,不但连续梁内力要发生剧烈的重分布,而且可能改变其破坏机构,与常温下具有显著的差异,塑性铰是一个可变铰.     

Further study on the flexural behaviour of concrete-filled steel tubes

This paper is a further study on the flexural behaviour of concrete-filled steel tubes based on the former work presented by Han [Han LH. Flexural behaviour of concrete-filled steel tubes. Journal of Constructional Steel Research 2004;60(2):313-37]. A total of 36 composite beam specimens filled with self-consolidating concrete (SCC) were tested. The main parameters varied in the tests are: (1) sectional types (circular and square); (2) steel yielding strength (from 235 to 282 MPa); (3) the ratio of tube diameter (or width) to wall thickness, D/t (from 47 to 105), and (4) the ratio of shear span to depth (from 1.25 to 6). Comparisons are made with predicted beam capacities using the existing methods, such as AIJ-1997 [Architectural Institute of Japan (AIJ). Recommendations for design and construction of concrete filled steel tubular structures. 1997], AISC-LRFD-1999 [AISC. Load and resistance factor design specification for structural steel buildings. Chicago: American Institute of Steel Construction, Inc.; 1999], BS5400-1979 [British Standard Institute: BS5400, Part 5, Concrete and composite bridges. 1979], EC4-1994 [Eurocode 4. Design of composite steel and concrete structures, Part 1.1: General rules and rules for buildings (together with United Kingdom National Application Document). DD ENV 1994-1-1:1994. London W1A2BS: British Standards Institution; 1994] and the method proposed by Han [Han LH. Flexural behaviour of concrete-filled steel tubes. Journal of Constructional Steel Research 2004;60(2):313-37].Applied calculation formulae of moment versus curvature curves and the flexural stiffness of concrete-filled steel tubular (CFST) beams are presented, based on the mechanics model of Han [Han LH. Flexural behaviour of concrete-filled steel tubes. Journal of Constructional Steel Research 2004;60(2):313-37]. Comparisons are made with predicted beam flexural stiffness using different methods, such as AIJ-1997, AISC-LRFD-1999, BS5400-1979, EC4-1994 and the method proposed in this paper. Comparisons are also made between the simplified model and the mechanics model, and generally good agreement is achieved.     

掺粉煤灰高强混凝土强度的试验研究

对以细度为600m^2／kg的粉煤灰为掺合料的高强混凝土的试验进行了研究，利用试验得出了水胶比为0．3，掺合量为20％的配比为最佳方案。同时亦表明了粉煤灰高强混凝土的强度受水胶比、掺合量、养护条件和温度等多方面因素综合影响。     

悬链线无铰拱拱轴系数m值的确定

以马鞍山大桥为例，运用计算机桥梁计算程序，按平面有限元分析，选取了无数组m值进行了各截面应力值的比较，得出一些有意义的结论，最终使各截面受力均匀，有利于截面尺寸及受力钢筋的控制，使其达到最为经济的状态。     

确保混凝土结构优质工程的相关措施

对原材料、钢筋工程、模板工程、混凝土工程的施工技术措施进行了介绍，并从人力资源管理、设备器具管理、过程管理、经济措施几个方面阐述了质量管理措施，以确保混凝土结构的工程质量。     

旋挖钻孔混凝土灌注桩常见质量问题防治措施

针对桩位偏移、桩孔倾斜、塌孔等旋挖钻孔混凝土灌注桩常见的质量问题，就其产生的原因进行了分析，并提出相应的预防措施和处理办法。     

高温条件下混凝土施工中的裂缝分析与控制

结合阿联酋混凝土工程施工状况，对影响混凝土裂缝问题的因素作了简要分析，总结了一些相关认识和观点，并提出了具体的预防措施，以使混凝土裂缝的发展降低到最小程度。