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。     

A/O复合式生物膜工艺缺氧段的动力学模型

对A/O复合式生物膜工艺的缺氧段进行了深入研究,并以物料平衡理论为基础,结合莫诺方程和Fick定律,建立了相应的底物降解和微生物增殖的动力学模型.算例结果表明,理论值与试验所得数据有相似的变化趋势,但两者间存在一定的偏差,而且随着进水有机物浓度的增加,其偏差逐渐加大,不过最大偏差率仅为13%,说明模型与实际情况符合较好,比较准确地预测了缺氧段的运行效果,这为该工艺的设计、运行和控制提供了较好的理论基础.     

室内外温差对某车间混凝土排架的力学影响

利用有限元分析软件ANSYS7．1，对某车间钢筋混凝土排架在室内外温差作用下的力学反应进行了分析，提出了解决温度荷载带来的应力问题的两种方法，有效确保了结构的安全。     

可持续发展住宅的规划与设计

笔者通过对跨世纪住宅规划、设计实践的分析与总结，提出以可持续发展为中心的设计思路，并强调提高科技含量，关注信息时代人的生活需求，并据此创造更加健康、宜人的人居环境。     

灰色系统理论在滑坡预测中的应用

本文运用灰色理论，对滑坡监测数据进行处理，建立预测模型，为滑坡治理提供重要信息。     

分层岩土介质爆炸效应的三维仿真模拟

分层岩土介质的爆炸效应是一个复杂的动力学问题,运用离散元框架内的三维梁-颗粒模型模拟分层岩土介质的爆炸效应.把介质用颗粒单元离散化,在相邻颗粒间添加梁,这样研究对象就成为一个由颗粒单元与梁网络形成的复合结构.梁的作用是使颗粒的集合体具有与初始对象近似的强度性质.用离散元法描述颗粒单元的运动,并通过相邻颗粒间的相对位移计算梁的变形,根据梁的强度准则判别梁是否存在;裂纹的产生及碎块的形成通过梁的消失来体现.然后采用矩阵位移法计算梁的受力,并反作用于对应的颗粒单元上.模拟结果表明,梁-颗粒模型可以克服以连续介质力学为基础的有限元等数值方法对于模拟大变形时的局限性,可以逼真地体现爆炸载荷下裂纹的生成、扩展以及碎块的形成及飞离母体等大运动特征,且模拟结果与试验结果基本一致,该方法可用于爆炸效应数值模拟,是一种有效的手段.     

钢筋制作的工厂化在建筑中的应用

分析了目前国内钢筋制作存在的问题以及新加坡的钢筋制作特点，介绍了工厂化制作钢筋焊接网的特点，论述了钢筋焊接网具有的优点，指出钢筋制作工厂化将成为一种发展趋势。     

Concurrent denitrification and oxygen uptake in microbial films

Mixed microbial films were grown on the inner walls of a tubular reactor with recirculation of the reactor contents and continuous flow-through of nutrient solution. The loss of total oxidized nitrogen was correlated to the film population, the nitrite concentration and the dissolved oxygen concentration in the reactor. When film population was greater than 0.5 × 10⁹ cells cm⁻², reactor dissolved oxygen concentration greater than 1 mg l⁻¹ had little effect on the nitrate loss. Nitrate loss declined for film populations greater than 2 × 10⁹ cells cm⁻². Models based on Monod and zero-order microbial kinetics were calibrated using these data and a nonlinear least squares method. There was little difference in the residual errors with these methods.     

Cyclic behaviour of post-Northridge WUF-B connections

The purpose of this study is to evaluate the cyclic behavior of post-Northridge Welded Unreinforced Flange-Bolted web (WUF-B) connections made using new notch tough welding materials and welding procedures, and a modified access hole. Since no WUF-B connection test results were found which satisfy the minimum design and detail requirements of the 2002 AISC Seismic Provisions for Structural Steel Buildings, this study made three full-scale test specimens of WUF-B connections according to the provisions. The main variable of the specimens was the ratio of the panel zone strength to the connected beam strength (panel zone strength ratio). Quasi-static cyclic testing was conducted. This study found that post-Northridge WUF-B connection specimens having a stronger panel zone experienced more significant slip between the bolted shear tab and the beam web. It was observed that the slip caused stress concentrations in and around the access hole, resulting in connection failure. The WUF-B connection specimen having the weakest panel zone did not, however, experience excessive slip between the bolted shear tab and beam web. Moreover, this WUF-B specimen could not achieve the required beam strength. This study observed that post-Northridge WUF-B connections with a panel zone strength ratio ranging from 0.9 to 1.6 provides a drift ratio exceeding 0.2. This drift ratio is required for satisfactory performance of the connections of Intermediate Moment Frames. Furthermore, this study proposed an analytical model for post Northridge WUF-B connections having different panel zone strength ratios.     

A pore crack model for the mechanical behaviour of porous granular rocks in the brittle deformation regime

A model is developed for predicting and simulating the mechanical behaviour and failure mode of brittle porous granular rocks loaded in compression. It is based on a fracture mechanics analysis applied to cracks emanating from the surface of cylindrical pores in two-dimensional, which is well suited to the microstructure of such rocks. It is also consistent with the usual experimental procedure used for biaxial compression tests since the numerical scheme is implemented under the assumption of imposed axial strain. The model takes into account interactions between neighbouring cracks, which grow when their stress intensity factor reaches the fracture toughness of the rock. The simulation of crack growth from cylindrical holes, associated with a failure criterion based on the coalescence of interacting cracks, allows one to calculate the critical stress at rupture and to derive theoretical stress–strain curves.The present model is then used to compare theoretical results with laboratory data obtained on four sandstones with porosity ranging between 13% and 25.5% which were deformed under conventional triaxial compression conditions at confining pressures between 0 and 35 MPa. The comparison shows that by using a small number of parameters (pore size, pore density, fracture toughness, and elastic moduli), the model is able to predict the rock behaviour during the compression tests and the stress level at rupture in a quite accurate way, when the microstructural parameters introduced are consistent with the observations.